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Sample records for spixii steindachner siluriformes

  1. Induced spawning and reproductive variables of the catfish Lophiosilurus alexandri Steindachner, 1876 (Siluriformes: Pseudopimelodidae

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    Hélio Batista dos Santos

    Full Text Available Lophiosilurus alexandri is an endemic fish from the São Francisco River basin, Brazil. The aim of this study was to induce L. alexandri to spawn and to obtain data on several reproductive variables for this species. For induced spawning, adults were submitted to Cyprinus carpio pituitary homogenate (CPH. Nine of the 12 females (75% responded positively to the treatment. The stripping of oocytes was performed 8.4 h after the second dose of CPH with the water temperature maintained at 26ºC. The number of stripped oocytes per gram of ova was 74 ± 5 oocytes g-1, and the mean oocyte diameter was 3.1 ± 0.2 and 3.6 ± 0.2 mm, before and after hydration, respectively. The oocytes were opaque, yellowish, demersal, highly adhesive, and covered by a gelatinous coat. The total fecundity was 4,534 ± 671 oocytes, and the fertilization rate was 59%. The initial and final fertilities were 2,631 ± 740 and 1,542 ± 416 embryos, respectively. Larval hatching occurred up to 56 h after fertilization, and the larvae had a total length of 8.4 ± 0.1 mm. This work provides important biological information for L. alexandri that can be used for management and conservation of this species.

  2. Heterochromatin heterogeneity in Hypostomus prope unae (Steindachner, 1878 (Siluriformes, Loricariidae from Northeastern Brazil

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    Jamille Bitencourt

    2011-11-01

    Full Text Available Cytogenetic analyses using C-banding and chromosomal digestion by several restriction enzymes were carried out in four populations (named A, B, C and D of Hypostomus prope unae (Loricariidae, Hypostominae from Contas river basin, northeastern Brazil. These populations share 2n=76 and single NORs on the second metacentric pair but exclusive karyotype forms for each locality. Populations A and B presented conspicuous terminal and interstitial heterochromatic blocks on most of acrocentric chromosomes and equivalent to NORs with differences in both position and bearing pair. Population D showed evident marks at interstitial regions and interspersed with nucleolar region while population C presented interstitial and terminal heterochromatin segments, non-coincident with NORs. The banding pattern after digestion with the endonucleases Alu I, Bam HI, Hae III and Dde I revealed a remarkable heterogeneity within heterochromatin, allowing the identification of distinctive clusters of repeated DNA in the studied populations, besides specific patterns along euchromatic regions. The analysis using restriction enzymes has proved to be highly informative, characterizing population differences and peculiarities in the genome organization of H. prope unae.

  3. Ectoparasites as numerical dominant species in parasite community of Trachelyopterus striatulus (Siluriformes: Auchenipteridae) from Guandu River, southeastern Brazil.

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    Mesquita, R L B; Azevedo, R K; Abdallah, V D; Luque, J L

    2011-08-01

    Sixty specimens of singing catfish Trachelyopterus striatulus (Steindachner, 1877) (Siluriformes: Auchenipteridae) collected from Guandu River (22º 48' 32" S and 43º 37' 35" W), in the state of Rio de Janeiro, Brazil from October 2006 to March 2009, were necropsied to study their parasites. From the 60 specimens of T. striatulus examined 57 were parasitised by at least one parasite species. The majority of the parasite specimens collected were monogeneans followed by Nematoda, Digenea and Hirudinea. Cosmetocleithrum sp. was the numerically predominant species with highest prevalence and abundance. The parasites of T. striatulus showed the typical pattern of aggregated distribution. No parasite species showed significant correlation between the body total length of the host and their abundance. The mean parasite species richness was not correlated with the host's total body length and sex. Values of the Brillouin index of diversity had a mean of H = 0.083 ± 0.136.

  4. Inseminating dose and water volume applied to the artificial fertilization of Steindachneridion parahybae (Steindachner, 1877 (Siluriformes: Pimelodidae: Brazilian endangered fish

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    Eduardo Antônio Sanches

    Full Text Available Abstract The Steindachneridion parahybae is an endangered catfish from Brazil and strategies applied for gametes optimization are necessary. The aim of this study was to assess inseminating doses and water volume upon the fertilization, hatching rates and percentage of normal larvae in S. parahybae . Was used a randomized design in factorial scheme (4×4 with four inseminating doses: 1.0×104, 1.0×105, 1.0×106, 1.0×107spermatozoa oocyte-1 and four volumes of water: 1, 35, 65 and 95mL of water g-1 of oocytes. The combination of doses and volumes were performed in triplicates (n=48. Each incubator (1.5L of useful volume with 1g of oocytes was considered as an experimental unit. Significant interaction between inseminating doses and volumes of water to the values of the fertilization rates and quadratic effect of doses and volume for the values of hatching rates were observed. The doses and volumes did not influence the percentage of normal larvae (87.70±5.06%. It is recommended the use of 5.5×106 spermatozoa oocyte-1 and 1mL of water g-1 of oocytes during in vitro fertilization procedure. These results allowed us to develop new biotechnological strategies applied to the conservation of S. parahybae .

  5. Morphology of gills of the seawater fish Cathorops spixii (Agassiz (Ariidae by scanning and transmission electron microscopy

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    Daura R. Eiras-Stofella

    2002-12-01

    Full Text Available Gills of the seawater fish Cathorops spixii (Agassiz, 1829 were submitted to routine processing for observation in scanning and transmission electron microscopy. The wrinkled surface of the gill filaments showed well-defined cellular ultrastructures. Microridges on cellular surface were projected over all gill structures, including respiratory lamellae. Chloride cells were usually at primary lamellae. Some rodlet cells were found. Mucous secretory cells were uncommon at all parts of the gill arches. The pharyngeal region of the gill arches showed a lot of taste buds but no spines. There were small and strong rakers. Such morphology is indicative of fishes that swallow small food but do not have filtering habits. At the ultrastructural level the gills of C. spixii presented the typical morphological pattern of Teleostei fishes.

  6. Status of the eastern Pacific agujon needlefish Tylosurus pacificus (Steindachner, 1876) (Beloniformes: Belonidae).

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    Collettte, B B; Banford, H M

    2001-07-01

    Tylosurus pacificus (Steindachner, 1876) is confirmed to have full species rank based on: 1) sympatry with T. acus melanotus at Isla Gorgona and in Panamá; 2) level of morphological differentiation in numbers of vertebrae, dorsal and anal fin rays; and 3) level of mtDNA differentiation. The eastern Pacific agujon needlefish is found from the Gulf of California, Mexico, to Peru, including the Galápagos Islands.

  7. Molecular phylogeny of Neotropical monogeneans (Platyhelminthes: Monogenea) from catfishes (Siluriformes)

    Czech Academy of Sciences Publication Activity Database

    Mendoza-Palmero, Carlos Alonso; Blasco-Costa, I.; Scholz, Tomáš

    2015-01-01

    Roč. 8, MAR 18 2015 (2015), s. 164 ISSN 1756-3305 R&D Projects: GA ČR GBP505/12/G112 Institutional support: RVO:60077344 Keywords : Phylogeny * Monogenea * Dactylogyridae * Neotropical region * Diversity * Siluriformes * 28S rRNA Subject RIV: EG - Zoology Impact factor: 3.234, year: 2015

  8. MORPHOMETRIC CHARACTERISTICS OF RED BLOOD CELLS OF Telestes metohiensis (Steindachner, 1901

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    Radoslav Dekić

    2013-02-01

    Full Text Available The paper presents the morphometric characteristics of red blood cells of endemic fish species of Bosnia and Herzegovina, Telestes metohiensis (Steindachner, 1901 inhabiting the Vrijeka river in the Dabar field. A total of 30 fish were sampled during August, 2010. Morphological measurements included the following parameters: axes of the red blood cells and nuclei, the surface of the red blood cells and nuclei and the thickness of the red blood cells. Morphometric characteristics of the erythrocyte maturation stages (acidophilic and polychromatic erythroblasts were also studied as well as their proportion in the peripheral blood. 100 mature forms were measured for each individual. The propotion of the immature forms was expressed per 1000 erythrocytes. Results showed that dimensions of the erythrocytes differed in systematic categories as well as fish types. Dimensions of mature erythrocytes and their maturation stages of the same species differed in shape and size of the nuclei. Proportion of the erythrocyte maturation stages was very low in comparison with the mature erythrocytes, indicating the optimal environmental conditions for the studied species.Key words: morphometric characteristics, erythrocytes, Telestes metohiensis, proportion of immature stages

  9. Reproductive biology of Liseta Leporinus muyscorum Steindachner, 1901 in the Sinu River, Colombia

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    Fredys Segura-Guevara

    2017-01-01

    Full Text Available Objective. The reproductive biology of Liseta Leporinus muyscorum (Steindachner, 1901 in the Sinu river, Colombia, was studied. Materials and methods. Individuals were collected between March 2006 and February 2007, with lengths and weights ranging 20.5-41.0 (30.0 ± 3.7 cm of total length and 97.6-728.0 (320.9±117.9 g, respectively. The gonads were placed in Gilson solution, the Vazzoler scale was applicated and sexual proportion, sexual maturity index, spawning season, the length at first maturity, ovocites’s diameter and fecundity were estimated. Results. 344 individuals were collected, of which 249 were females and 95 were males, with sexual proportion female: male of 2.6:1, different from expected. The length at first maturity was estimated in 28.9, 28.1 y 28.8 cm TL for females, males and combined sexes, respectively, ovocites’s diameter was 977 μ and fecundity was estimated in 30793 oocytes. Conclusions. The Liseta is a fish with synchronous oocyte development in two groups, whose spawning season extends from February to September, with large oocytes and high fecundity, strongly associated with ovarian weight.

  10. Ultrastructure (SEM of the gills of Prochilodus Scrofa Steindachner (Pisces, Teleostei

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    Daura Regina Eiras-Stofella

    1998-01-01

    Full Text Available Gills arches of the freshwater fish Prochilodus scrofa Steindachner, 1881 (Lt= 8.0-12.4cm were removed to be analyzed in a scanning electron microscope. The morphology of the superficial structures of the gill filaments and pharyngeal region of the gills arches was discussed and related to their functional aspects. A great quantity of mucous secretory cells and of microridges, along with the pavement cell surface of the primary lamellae and branchial pharyngeal region, indicate the existence of a protection strategy of the respiratory lamellae. The chloride cells are abundant, specially on the distal portion of the primary lamellae, and bring out the osmo regulatory capacity of this species. This fish seems not to be a filtering one according to: its short and simple gill rakers; presence of several taste buds turned towards the mouth opening; evidence of spines on the external side of the arches and an abundant secretion of mucous in the pharyngeal region. This species probably selects the food to be swallowed through its chemical receptors and retains it with the help of spines and mucous secretion this way protecting the gills filaments against the rubbing of particles over them.

  11. Dimorfismo sexual em Siluriformes e Gymnotiformes (Ostariophysi da Amazônia Sexual dimorfism in Amazonian Siluriformes and Gymnotiformes (Ostariophysi

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    Lúcia H. Rapp Py-Daniel

    2005-01-01

    Full Text Available No presente trabalho é feito um levantamento dos casos de dimorfismo sexual em Siluriformes e Gymnotiformes. Este levantamento se restringe às formas Neotropicais, com ênfase mais especificamente, às da Amazônia. Peixes dessa região possuem uma grande diversidade, ainda que os limites intraespecíficos não estejam bem definidos. Embora preliminar, o mapeamento de características dimórficas em um cladograma referente a família Loricariidae (Siluriformes auxilia na demonstração de que padrões de dimorfismo sexual são consistentes com hipóteses de monofiletismo. Em Apteronotidae (Gymnotiformes, com base no mapeamento dos caracteres tamanho e forma do focinho e presença de dentes diferenciada em árvores filogenéticas, podemos inferir que esses caracteres originaram-se como eventos independentes em vários táxons. Recentemente, em Gymnotiformes, foram detectados casos de erros taxonômicos atribuídos a diferenças extremas entre machos e fêmeas.The present paper aims to summarize cases of sexual dimorphism in Siluriformes and Gymnotiformes. This summary focuses on Neotropical representatives, with emphasis on Amazonian fish. Fishes from this region exhibit high species-level diversity, although the intraspecific limits of many of these forms are unknown. In Loricariidae (Siluriformes, mapping of dimorphic traits on cladograms has helped to demonstrate that patterns of sex dimorphism are consistent with hypotheses of monophyly, thus reinforcing its role as an important evolutionary phenomenon. In Apteronotidae (Gymnotiformes, mapping of characters on phylogenetic trees suggests that sexual dimorphism (regarding snout size, form, and presence/absence of teeth has evolved independently in multiple taxa. Recently in Gymnotiformes, detected taxonomic errors are attributed to extreme differences between males and females in their morphology.

  12. A new species of Hepatozoon Miller, 1908 (Apicomplexa: Adelerina) from the snake Philodryas nattereri Steindachner (Squamata: Dipsadidae) in northeastern Brazil.

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    Borges-Nojosa, Diva M; Borges-Leite, M Juliana; Maia, João P; Zanchi-Silva, Djan; da Rocha Braga, Roberta; Harris, D James

    2017-01-01

    Based on both unique morphological characteristics of the gamont, distinct changes caused to the host erythrocyte and analysis of partial 18S rRNA gene sequences, a new parasite of the genus Hepatozoon Miller, 1908 is described from the snake Philodryas nattereri Steindachner (Squamata: Dipsadidae) in northeastern Brazil. The new species, Hepatozoon musa n. sp., is characterized by large and curved mature gamonts (18.9 ± 0.9 μm in length and 3.8 ± 0.3 μm in width) that considerably engorge infected host erythrocytes and displace the nucleus laterally, which become longer and thinner. Phylogenetic estimates indicate the new species is more closely related to the recently described Hepatozoon cuestensis O'Dwyer, Moço, Paduan, Spenassatto, Silva & Ribolla, 2013, from Brazilian rattlesnakes. These recent findings highlight the need for further studies of Hepatozoon to better determine the biodiversity of this common but poorly-studied parasite group.

  13. Imunolocalização de receptores de leptina no ovário de preás (Galea spixii Wagler, 1831

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    Luã B. Macêdo

    Full Text Available RESUMO: A leptina, uma citocina produzida pelas células adiposas, é alvo da comunidade científica por acreditarem que ela apresente impacto sobre a reprodução dos animais promovendo a puberdade, foliculogênese e oogênese, ciclo estral e auxiliando na fecundação. A compreensão dos mecanismos que controlam a atividade reprodutiva de preás (Galea spixii possui papel relevante para a preservação da espécie. Desta forma, o presente trabalho propôs analisar a imunolocalização dos receptores de leptina (Ob-R no ovário de preás. Coletaram-se os ovários de 20 fêmeas adultas, não prenhes e saudáveis. As amostras foram fixadas em paraformaldeído a 4% em tampão fosfato, incluídas em parafina e seccionadas para a realização de imunohistoquímica (IHC. As secções foram fotomicrografadas e avaliadas quanto à intensidade da reação. Observou-se forte imunorreação no oócito e nas células da teca, moderada nas células do estroma ovariano e nas células luteínicas grandes e fracamente coradas nas células da granulosa, endoteliais, perivasculares e células luteínicas pequenas. Quando comparado a expressão de receptores ao longo do desenvolvimento folicular foi observado que o oócito e as células da teca se mantiveram com expressão na mesma intensidade. Entretanto, as células da granulosa apresentaram forte marcação nos estádios pré-antrais enquanto que nos folículos antrais apresentou fraca intensidade. Concluímos que em ovários de Galea spixii existe a presença de Ob-R nas principais estruturas do ovário sugerindo que este hormônio desempenhe papel fundamental na reprodução desta espécie.

  14. Genetic diversity and genetic structure of consecutive breeding generations of golden mandarin fish (Siniperca scherzeri Steindachner) using microsatellite markers.

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    Luo, X N; Yang, M; Liang, X F; Jin, K; Lv, L Y; Tian, C X; Yuan, Y C; Sun, J

    2015-09-25

    In this study, 12 polymorphic microsatellites were inves-tigated to determine the genetic diversity and structure of 5 consecu-tive selected populations of golden mandarin fish (Siniperca scherzeri Steindachner). The total numbers of alleles, average heterozyosity, and average polymorphism information content showed that the genetic diversity of these breeding populations was decreasing. Additionally, pairwise fixation index FST values among populations and Da values in-creased from F1 generation to subsequent generations (FST values from 0.0221-0.1408; Da values from 0.0608-0.1951). Analysis of molecular variance indicated that most genetic variations arise from individuals within populations (about 92.05%), while variation among populations accounted for only 7.95%. The allele frequency of the loci SC75-220 and SC101-222 bp changed regularly in the 5 breeding generations. Their frequencies were gradually increased and showed an enrichment trend, indicating that there may be genetic correlations between these 2 loci and breeding traits. Our study indicated that microsatellite markers are effective for assessing the genetic variability in the golden mandarin fish breeding program.

  15. SYSTEMATIC REVISION OF THE GENERA OF PANGASIIDAE (SILURIFORMES, OSTARIOPHYSI

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    Rudhy Gustiano

    2008-06-01

    Full Text Available The family Pangasiidae belongs to the suborder Siluroidei, order Siluriformes, and suborder Ostariophysi. Since the groups were established as Pangasiini Bleeker, 1858; its content and classification have been greatly changed. Judging from the literature, the main constraint to cultivate wild species and to optimize the production of cultured species is needed to the poorly documented systematics of this family. Therefore the objective of the present study is to provide the diagnostic characters and the keys for identification the genera of Pangasiidae. The results clearly demonstrate that biometrically four natural groups can be distinguished. They are the genus Helicophagus, Pangasianodon, Pteropangasius, and Pangasius. The diagnosis of the family, the identification key of the genera and the description are given.

  16. Trophic ecomorphology of Siluriformes (Pisces, Osteichthyes) from a tropical stream.

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    Pagotto, J P A; Goulart, E; Oliveira, E F; Yamamura, C B

    2011-05-01

    The present study analysed the relationship between morphology and trophic structure of Siluriformes (Pisces, Osteichthyes) from the Caracu Stream (22º 45' S and 53º 15' W), a tributary of the Paraná River (Brazil). Sampling was carried out at three sites using electrofishing, and two species of Loricariidae and four of Heptapteridae were obtained. A cluster analysis revealed the presence of three trophic guilds (detritivores, insectivores and omnivores). Principal components analysis demonstrated the segregation of two ecomorphotypes: at one extreme there were the detritivores (Loricariidae) with morphological structures that are fundamental in allowing them to fix themselves to substrates characterised by rushing torrents, thus permitting them to graze on the detritus and organic materials encrusted on the substrate; at the other extreme of the gradient there were the insectivores and omnivores (Heptapteridae), with morphological characteristics that promote superior performance in the exploitation of structurally complex habitats with low current velocity, colonised by insects and plants. Canonical discriminant analysis revealed an ecomorphological divergence between insectivores, which have morphological structures that permit them to capture prey in small spaces among rocks, and omnivores, which have a more compressed body and tend to explore food items deposited in marginal backwater zones. Mantel tests showed that trophic structure was significantly related to the body shape of a species, independently of the phylogenetic history, indicating that, in this case, there was an ecomorphotype for each trophic guild. Therefore, the present study demonstrated that the Siluriformes of the Caracu Stream were ecomorphologically structured and that morphology can be applied as an additional tool in predicting the trophic structure of this group.

  17. Trophic ecomorphology of Siluriformes (Pisces, Osteichthyes from a tropical stream

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    JPA Pagotto

    Full Text Available The present study analysed the relationship between morphology and trophic structure of Siluriformes (Pisces, Osteichthyes from the Caracu Stream (22º 45' S and 53º 15' W, a tributary of the Paraná River (Brazil. Sampling was carried out at three sites using electrofishing, and two species of Loricariidae and four of Heptapteridae were obtained. A cluster analysis revealed the presence of three trophic guilds (detritivores, insectivores and omnivores. Principal components analysis demonstrated the segregation of two ecomorphotypes: at one extreme there were the detritivores (Loricariidae with morphological structures that are fundamental in allowing them to fix themselves to substrates characterised by rushing torrents, thus permitting them to graze on the detritus and organic materials encrusted on the substrate; at the other extreme of the gradient there were the insectivores and omnivores (Heptapteridae, with morphological characteristics that promote superior performance in the exploitation of structurally complex habitats with low current velocity, colonised by insects and plants. Canonical discriminant analysis revealed an ecomorphological divergence between insectivores, which have morphological structures that permit them to capture prey in small spaces among rocks, and omnivores, which have a more compressed body and tend to explore food items deposited in marginal backwater zones. Mantel tests showed that trophic structure was significantly related to the body shape of a species, independently of the phylogenetic history, indicating that, in this case, there was an ecomorphotype for each trophic guild. Therefore, the present study demonstrated that the Siluriformes of the Caracu Stream were ecomorphologically structured and that morphology can be applied as an additional tool in predicting the trophic structure of this group.

  18. Distribution and relative abundance of the marine catfish (Siluriformes, Ariidae) in Sepetiba Bay, Rio de Janeiro

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    Azevedo, Márcia Cristina Costa de; Araújo, Francisco Gerson; Cruz Filho, Antônio Gomes da; Santos, Alexandre Clístenes de Alcântara

    1998-01-01

    Marine catfish (Ariidae) are abundant resources in otter trawl fisheries carried out at Sepetiba Bay, Rio de Janeiro (Lat. 22º54, 23º04'S; Long. 43º34 44º10'W). Relative abundance and distribution were assessed, based in 158 fishing sampling at seven sites in the Bay, between July-1993 e June-1996. Five species were recorded in the following abundance rank order: Genidens genidens (Valenciennes, 1839), Caihorops spixii (Agassiz,1829), Sciadeichthys lunisculis (Valenciennes, 1840), Nelunia bar...

  19. Distribuição e abundância relativa de bagres marinhos (Siluriformes, Ariidae na Baía de Sepetiba, Rio de Janeiro Distribution and relative abundance of the marine catfish (Siluriformes, Ariidae in Sepetiba Bay, Rio de Janeiro

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    Márcia Cristina Costa de Azevedo

    1998-12-01

    Full Text Available Marine catfish (Ariidae are abundant resources in otter trawl fisheries carried out at Sepetiba Bay, Rio de Janeiro (Lat. 22º54, 23º04'S; Long. 43º34 44º10'W. Relative abundance and distribution were assessed, based in 158 fishing sampling at seven sites in the Bay, between July-1993 e June-1996. Five species were recorded in the following abundance rank order: Genidens genidens (Valenciennes, 1839, Caihorops spixii (Agassiz,1829, Sciadeichthys lunisculis (Valenciennes, 1840, Nelunia barba (Lacépède, 1803, and Bagre marinus (Mitchill, 1814, the latter have been caught in only two samples. Marine catfish showed higher abundance in the inner Bay, with indication of spatial segregation. G genidens was abundant in ali sites of lhe inner Bay, C. spixii e N. barba, near to rivers mouths, andS lunisculis, being widespread in ali studied area. Sazonality was not evident, with few exceplions in some of the three annual cycles; G. genidens and S. luniscutis were more abundant in biomass in summer 1994/95 (G. genidens and 1993/94 (S. luniscutis. G. genidens e N. barba show higher abundance (CPUE and biomass between July-93 and June-95 and C. spixii e S. luniscutis between July-95 and June-96. Total association index indicates a overall positive association among ali species, with. higher Jaccard and Sorensen similarities coefficient for the pairs C. spixii/G. genidens, G. genidens/S. luniscutis, e C. spixii/S. luniscutis. Pearson linear correlation and Sperman rank indicate that G. genidens and N. barba are inversely correlated to C. spixii and S. luniscutis. Spatial segregation strategy may be explaining the coexistence of the marine catfish at Sepetiba Bay.

  20. A microestrutura e o desenvolvimento dos órgãos genitais masculinos de preás (Galea spixii criados em cativeiro The microstructure and development of male genital organs of Spix's yellow-toothed cavy (Galea spixii bred in captivity

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    Paulo R.S. Santos

    2012-12-01

    Full Text Available O preá do semiárido nordestino (Galea spixii é um roedor pertencente à família Caviidae. São encontrados nas regiões da Caatinga e do Cerrado Brasileiro e se reproduz ao longo do ano, apresentando um período de gestação de 48 dias e uma ninhada de 2 a 4 crias. O objetivo deste estudo foi caracterizar histologicamente os componentes estruturais dos órgãos genitais de preás machos relacionando com a evolução cronológica destes órgãos na espécie. Foram utilizados para análise animais ao nascimento e aos 15, 30, 45, 60, 75, 90, 105, 120 e aos 150 dias de idade. Fragmentos do epidídimo, ducto deferente, pênis e glândulas sexuais acessórias foram coletados, fixados e processados para descrição em microscopia de luz. O epidídimo apresentou epitélio colunar simples e em cada fase sexual notou-se diferença quanto ao tamanho do lúmen tubular e à presença de espermatozóides no lúmen aos 45 dias de idade. O epitélio do ducto deferente no preá mostrou-se pseudo-estratificado colunar com crescente presença de estereocilios com o avanço da idade. A glândula vesicular no preá apresentou uma mucosa com pregueamento variado, de acordo com a fase do desenvolvimento sexual. A próstata mostrou-se pouco desenvolvida, com lúmen pequeno nos preás ao nascimento e aos 15 dias de idade; aos 45 dias mostrou-se com um pregueamento do epitélio variável. Os órgãos genitais masculinos do preá passaram por transformações morfológicas no decorrer da idade e com o desenvolvimento sexual, isso colaborou para a determinação do início da fase da puberdade, que na espécie em estudo foi aos 45 dias de idade.The Spix's yellow-toothed cavy (Galea spixii from the Brazilian northeastern semi-arid is a rodent that does belong to the family Caviidae. They are found in regions of the Caatinga and Cerrado, and reproduces throughout the year, with a gestation period of 48 days and a litter of 2 to 4 pups. The aim of this study was to

  1. Monogeneans from Pangasiidae (Siluriformes in Southeast Asia: V. Five new species of Thaparocleidus Jain, 1952 (Ancylodiscoididae from Pangasius nasutus

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    Pariselle A.

    2003-12-01

    Full Text Available The examination of gill parasites from Pangasius nasutus (Bleeker, 1862 (Siluriformes, Pangasiidae revealed the presence of five new species of Monogenea, all belonging to Thaparocleidus Jain, 1952 (Monogenea, Ancylodiscoididae as defined by Lim (1996 and Lim et al. (2001: T. serpens n. sp., T. ocrea n. sp., T. megagripus n. sp., T. citreum n. sp. and T. alatus n. sp.

  2. The complete mitochondrial genome of the helmet catfish Cranoglanis bouderius (Siluriformes: Cranoglanididae) and the phylogeny of otophysan fishes

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    Peng, Zuogang; Wang, Jun; He, Shunping

    2006-01-01

    the approximately unbiased test, the Kishino-Hasegawa test, and the Shimodaira-Hasegawa test. The results show that the grouping ((((Characiformes, Gymnotiformes), Siluriformes), Cypriniformes), outgroup) is the most likely but there is no significant difference between this one and the other alternative hypotheses...

  3. Spatial variation of five co-existing siluriformes in an atlantic rain forest drainage

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    Rosana Mazzoni

    2009-02-01

    Full Text Available Five species of Siluriformes were registered in the Ubatiba system. Pimelodella lateristriga was the dominant one, followed by Hypostomus gr. punctatus, Rineloricaria sp., Callichthys callichthys and Rhamdia sp. Simple correlation analysis between species density and habitat parameters indicated that hydrology explained density patterns of four species. Pimelodella densities were negatively correlated with pools, Callichthys and Hypostomus densities were positively correlated with runs and Rhamdia densities were positively correlated with riffles; Rineloricaria densities did not respond to any hydrological parameter. Substrata were an important factor to all species, but specific preferences were observed. Marginal vegetation was positively correlated only to Pimelodella densities. Sorensen dissimilarity analysis indicated that site groups, based on both species composition and habitat parameters, were very similar and corroborated the correlation analysis suggesting that Siluriformes composition should be explained by many habitat parameters. Analysis of co-variation of species densities at each sampling occasion showed to be statistically similar in at least all (100% analysed cases indicating that Siluriformes composition was strongly persistent in time.Cinco espécies de Siluriformes foram registradas no sistema fluvial do rio Ubatiba, Pimelodella lateristriga foi a espécie dominante seguida de Hypostomus gr. punctatus, Rineloricaria sp., Callichthys callichthys e Rhamdia sp. Análises de correlação simples entre as densidades das espécies e as variáveis de hábitat indicaram que a hidrologia explicou os padrões de densidade de quatro espécies; as densidades de Pimelodella foram negativamente correlacionadas com a presença de poças, as densidades de Callichthys e Hypostomus foram positivamente correlacionadas com os rápidos e as densidades de Rhamdia foram positivamente correlacionadas com as corredeiras; as densidades de

  4. Studies in two allopatric populations of Hypostomus affinis (Steindachner, 1877): the role of mapping the ribosomal genes to understand the chromosome evolution of the group.

    Science.gov (United States)

    Brandão, Karina de Oliveira; Rocha-Reis, Dinaíza Abadia; Garcia, Caroline; Pazza, Rubens; de Almeida-Toledo, Lurdes Foresti; Kavalco, Karine Frehner

    2018-01-01

    Several cytogenetic markers show chromosomal diversity in the fish such as "armoured catfish". Although studies have characterized many species in the major genera representing these Siluridae, particularly in the genus Hypostomus Lacépède, 1803, trends in chromosome evolution of this group remain unclear. The Paraíba do Sul river basin contains the armoured catfish Hypostomus affinis Steindachner, 1877, which is unique because of its distribution of repetitive DNAs, the 5S and 18S rDNA. Identified samples and registered collections in Brazilian museums were identified as the same typological species, while we observed wide variations in the physical location of this gene in the karyotype based on fluorescent in situ hybridization results. In this study, we propose that these species can represent evolutionarily independent units, as these fish frequently undergo processes such as dispersion and vicariance and that the rDNA is associated with DNA that spreads in the genome, such as transposons. Additionally, the absence of gene flow due to the distance of the sample location could intensify evolutionary processes. The phenotypes found for the 18S rDNA showed minor changes in relation to the number of sites between the lower and upper drainage regions of Paraíba do Sul. The large difference in the number of sites found for the 5S rDNA entered the same region (upper drainage of the basin) and the literature data could represent a population dynamics where an expansion of the 5S rDNA sites provides an extinct or non-sampled cytotype in this work.

  5. Aspectos biológicos e pesqueiros de Paralonchurus brasiliensis Steindachner, (Pisces, Sciaenidae, na Armação do Itapocoroy, Penha, Santa Catarina, Brasil Biological and fishing aspects of Paralonchurus brasiliensis Steindachner, (Pisces, Sciaenidae, in the Armação do Itapocoroy, Penha, Santa Catarina, Brazil

    Directory of Open Access Journals (Sweden)

    Joaquim O. Branco

    2005-12-01

    Full Text Available Apesar da abundância de Paralonchurus brasiliensis (Steindachner, 1875 na ictiofauna acompanhante do camarão sete-barbas, apresenta baixo valor comercial sendo freqüentemente descartada. Esse trabalho tem como objetivo apresentar informações básicas sobre a biologia e pesca de P. brasiliensis na Armação do Itapocoroy, Penha, Santa Catarina. As coletas foram realizadas mensalmente durante o período de agosto 1996 a julho 2003, em três áreas tradicionais de atuação da pesca artesanal. A espécie apresentou crescimento alométrico positivo, com uma razão sexual de 1:2,1 entre machos e fêmeas, e tamanho de primeira maturação em 14,8 cm e 15,0 cm. P. brasiliensis apresentou amplo espectro trófico composto por 27 itens, sendo que, a partir da primavera ocorreu um incremento gradual na ingestão de alimento até o verão, seguido de queda abrupta no outono e de pequena recuperação no inverno. Apesar das flutuações sazonais ao longo dos sete anos, essa espécie ocupou a segunda posição em número e biomassa entre as integrantes da ictiofauna acompanhante.Due to abundance of P. brasiliensis (Steindachner, 1875 in ictiofauna of the sea-bob-shrimp's bycatch, it presents low commercial value and frequently being discarded. This work aims to present basic information on biology and fisheries of P. brasiliensis in the Armação do Itapocoroy, Penha, Santa Catarina. The collections were carried out monthly during the period of August 1996 to July 2003, in three traditional areas of performance of artisan fisheries. The species presented positive alometric growth, with a sexual ratio of 1:2,1 between males and females, and the size of first maturation in 14,8 cm and 15,0 cm. P. brasiliensis presented a great trophy specter composed by 27 items, being that, from the spring a gradual increment in the food ingestion occurred until the summer, followed of abrupt fall in the autumn and small recovery in the winter. Despite of the seasonal

  6. Monogeneans from Pangasiidae (Siluriformes in Southeast Asia : VI. Pangasitrema camillae n. g., n. sp. (Monogenea, Ancylodiscoididae, from Pangasius polyuranodon

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    Pariselle A.

    2004-06-01

    Full Text Available The examination of gill parasites from Pangasius polyuranodon Bleeker, 1852 (Siluriformes, Pangasiidae in Indonesia revealed the presence of a new species of Monogenea, belonging to a new genus : Pangasitrema camillae n. g., n. sp. (Ancylodiscoididae. Among Ancylodiscoididae, the genus has several distinguishing features : the reduced size of the haptor, the morphology and size of gripi, the absence of a ventral transversal bar and of a cuneus associated with dorsal gripi.

  7. Three new Pimelodus species (Siluriformes: Pimelodidae from the rio Tocantins drainage, Brazil

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    Frank R.V. Ribeiro

    Full Text Available Three new species of Siluriformes from the rio Tocantins drainage of Brazil are placed in the genus Pimelodus, P. stewarti, P. joannis, and P. halisodous. Pimelodus halisodous differs from the sympatric P. joannis and P. stewarti by the number of premaxillary tooth rows (13-16 vs. 5-9. Pimelodus joannis differs from P. stewarti by the presence of two dark blotches on the base of the caudal fin. The three new species differ from all other species of Pimelodus by the possession of a uniform gray coloration along flanks; the relatively short distance between the posterior nostril and the anterior orbital border; a short maxillary barbel, that only slightly surpasses the caudal-fin base.

  8. Neotropical Siluriformes as a Model for Insights on Determining Biodiversity of Animal Groups.

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    Renata Rúbia Ota

    Full Text Available We performed an analysis of the descriptions of new species of Neotropical Siluriformes (catfishes to estimate the number of new species that remain to be described for a complete knowledge on biodiversity of this order, to verify the effectiveness of taxonomic support, and to identify trends and present relevant information for future policies. We conducted a literature review of species descriptions between January 1990 and August 2014. The following metadata were recorded from each article: year of publication, number of species, journal and impact factor, family(s of the described species, number of authors, age of the authors and coauthors, country of the first author's institution and ecoregion of the type-locality. From accumulation of descriptions, we built an estimate model for number of species remaining to be described. We found 595 described species in 402 articles. The data demonstrated that there has been an increased understanding of the diversity of Siluriformes over the last 25 years in the Neotropical region, although 35% of the species still remain to be described. The model estimated that with the current trends and incentives, the biodiversity will be known in almost seven decades. We have reinforced the idea that greater joint efforts should be made by society and the scientific community to obtain this knowledge in a shorter period of time through enhanced programs for promoting science, training and the advancement of professionals before undiscovered species become extinct. The model built in this study can be used for similar estimates of other groups of animals.

  9. Distribution, feeding and ecomorphology of four species of Auchenipteridae (Teleostei: Siluriformes in Eastern Amazonia, Brazil

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    Tiago M. S. Freitas

    Full Text Available ABSTRACT Fish exhibit morphological, physiological and behavioral specializations which enable them to display different ways to explore the environments and resources. Thus, the aim of this study was to verify how four Auchenipteridae species differ in the distribution, feeding habits and morphological traits: Auchenipterichthys longimanus (Günther, 1864, Auchenipterus nuchalis (Spix & Agassiz, 1829, Tatia intermedia (Steindachner, 1877 and Trachelyopterus galeatus (Linnaeus, 1766. This study was conducted in rivers and bays of the Anapú Basin, Pará State (Brazil, where these species are abundant. Specimens were collected using gillnets, and after caught the stomachs were removed for the contents analyzes. Eighteen morphometric measurements from ten adult specimens of each species were taken, combined into fifteen ecomorphological attributes. The species distribution showed that A. longimanus was restricted to rivers, while the others were exclusively caught in the bays. All four species had their diet composed of allochthonous insects, but A. longimanus also exhibited a great frugivorous habit. The most important ecomorphological attributes were relative to the consumption of larger food items (for A. longimanus and T. galeatus and to the longer swimming capacity (for A. longimanus and T. intermedia. These morphological differences and the trophic diversity presented in this study highlighted some important information about how ecomorphological similar species behave and share resources, which may play a significant role on the coexistence of these species in the Anapú Basin.

  10. Redescription of Hypostomus johnii, a senior synonym of Hypostomus eptingi (Siluriformes: Loricariidae, Northeastern Brazil

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    Telton Pedro Anselmo Ramos

    2017-06-01

    Full Text Available ABSTRACT Hypostomus johnii (Steindachner was described from the rio Parnaíba basin in the state of Piauí and the rio São Francisco basin in the state of Bahia. Despite the good quality of the original description of H. johnii, it does not currently allow its distinction from congeners. Thus, H. johnii is redescribed based on the analysis of the types and several recently collected specimens. Recent collecting efforts of the rios Parnaíba and São Francisco basins resulted in specimens only being found in the rio Parnaíba basin. This raises doubts about whether H. johnii occurs in the rio São Francisco basin. The species is distinguished from its congeners by having a high number of teeth on the premaxilla and dentary (between 60-115; small to moderate-sized dark spots with a light background; absence of keels on flanks; and abdominal plates more evident on laterals. A lectotype of H. johnii is designated herein and H. eptingi is considered a junior synonym of H. johnii.

  11. Morphological, histological and histochemical analysis of the digestive tract of Trachelyopterusstriatulus (Siluriformes: Auchenipteridae

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    Marcella L. dos Santos

    2015-08-01

    Full Text Available ABSTRACT The digestive tract of Trachelyopterus striatulus (Steindachner, 1877 was studied using morphological, histological, and histochemical techniques. The barbels, lips and tongue had stratified squamous epithelium with mucous, claviform cells, and taste buds. Trachelyopterus striatulus had a dental plaque with villiform teeth. The bucopharyngeal cavity was formed by the gill apparatus and pharyngeal teeth with vilifform denticles. The oesophagus presented stratified squamous epithelium with mucous cells and taste buds. The stomach included cardiac, fundic, and pyloric regions and a simple prismatic epithelium with prismatic cells that reacted positively to periodic acid-Schiff (PAS and amylase+PAS. Only the cardiac and pyloric regions responded positively to alcian blue pH 2.5 (Ab pH 2.5 and alcian blue pH 0.5 (Ab pH 0.5. The cardiac and fundic regions exhibited tubular gastric glands. The intestine was 118.90 ± 22.49 mm long with an intestinal coefficient (CO of 0.83 ± 0.13. The epithelium was simple prismatic with a brush border and goblet cells, and a greater number of goblet cells were found in the caudal region of the intestine. The mucous cells and goblet cells reacted positively to PAS, amylase+PAS, Ab pH 2.5, and Ab pH 0.5. We analysed if the function of the mucosubstances and morphological characteristics of the digestive tract of T. striatulus are compatible with omnivorous feeding habit.

  12. Nuclear DNA content in 20 species of Siluriformes (Teleostei: Ostariophysi from the Neotropical region

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    Paulo César Fenerich

    2004-01-01

    Full Text Available In the present study, 20 species of Siluriformes fish were analyzed in order to determine their nuclear DNA content and compare these data with their diploid number. In addition, the extension and importance of the changes that occurred during the process of diversification in the group of Neotropical freshwater catfish were investigated. The only species studied of the family Doradidae, Rhinodoras d'orbignyi (2n = 58, presented 3.46 ± 0.13 pg of DNA. Among the species of the family Heptapteridae, the values of nuclear DNA content and the diploid numbers ranged from 1.13 ± 0.09 pg of DNA in Pimelodella sp. (2n = 46 to 2.38 ± 0.07 pg of DNA in Imparfinis mirini (2n = 58. The family Loricariidae showed the widest variation in diploid number and nuclear DNA content values, ranging from 2n = 52 and 3.96 ± 0.22 pg of DNA in Liposarcus anisitsi to 2n = 76 and 4.90 ± 0.12 pg of DNA in Hypostomus sp. 4. In this group, two local samples of Pimelodus maculatus (Pimelodidae were analyzed, and both exhibited 2n = 56, but different nuclear DNA content values (2.68 ± 0.22 pg and 2.82 ± 0.20 pg, respectively. Among the Pseudopimelodidae species analyzed, Pseudopimelodus mangurus (2n = 54 showed 2.23 ± 0.15 pg and Microglanis cottoides (2n = 54 exhibited 2.50 ± 0.18 pg of DNA. Two species of Trichomycterus (Trichomycteridae also presented the same diploid number, 2n = 54 chromosomes, but, while the species from the Quinta stream presented a DNA content of 2.62 ± 0.19 pg, in the sample from the Capivara river this value was 2.30 ± 0.23 pg. In the analyzed species, the results showed that the changes in DNA content were frequently not followed by changes in the diploid number. This fact permits to suggest that, in addition to structural chromosome rearrangements, other mechanisms, including deletions, duplications and polyploidy, could be involved in the process of species differentiation in the representatives of the fish order Siluriformes.

  13. Monogeneans from Pangasiidae (Siluriformes in Southeast Asia: X. Six new species of Thaparocleidus Jain, 1952 (Ancylodiscoididae from Pangasius micronema

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    Pariselle A.

    2006-12-01

    Full Text Available The examination of gill parasites from Pangasius micronema Bleeker, 1847 (Siluriformes, Pangasiidae in Southeast Asia revealed the presence of nine species of Monogenea. Two (Thaparocleidus brevicochleus Pariselle, Lim & Lambert, 2001 and T. sinespinae Pariselle, Lim & Lambert, 2001 have been previously described. Among the others, six species, belonging to Thaparocleidus Jain, 1952 (Monogenea, Ancylodiscoididae as defined by Lim (1996 and Lim et al. (2001, are considered new species: T. tacitus n. sp., T. summagracilis n. sp., T. portentosus n. sp., T. rukyanii n. sp., T. durandi n. sp., and T. lebrunae n. sp. The remaining species is represented by too few individuals to be conclusively described.

  14. Pigmentação testicular em Physalaemus nattereri (Steindachner (Amphibia, Anura com observações anatômicas sobre o sistema pigmentar extracutâneo Testicular pigmentation in Physalaemus nattereri (Steindachner (Amphibia, Anura with anatomical observations on the extracutaneous pigmentary system

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    Classius de Oliveira

    2005-06-01

    Full Text Available O presente estudo foi realizado com o intuito de relatar a ocorrência e morfologia de células pigmentares viscerais constituintes do "sistema pigmentar extracutâneo" em Physalaemus nattereri (Steindachner, 1863 (Leptodactylidae. Foram utilizados dez exemplares machos para a análise macroscópica e obtenção de fragmentos testiculares incluídos em resina e corados com H/E. Os anuros, dentre outros animais exotérmicos, possuem células especiais, os melanócitos, que se caracteriza por intensa pigmentação e sintetiza melanina, além de melanomacrófagos, que se caracteriza por atividade fagocítica e muitas vezes apresentam intensa pigmentação. A nomenclatura destas células não é consensual e, por isso, várias denominações são apresentadas, principalmente nos seguintes órgãos: fígado (como sinônimo de células de Kupffer, rins, baço e menos freqüentemente em outras localizações, com os termos - células pigmentares, células pigmentares extracutâneas, macrófagos pigmentados, melanomacrófagos, melanófagos, melanóforos e melanócitos. Para os anuros os estudos são recentes e relatam células pigmentares em poucas espécies. Em Physalaemus nattereri e alguns anuros, os pigmentos melânicos são encontrados, além da cútis, em outros órgãos constituindo um sistema pigmentar extracutâneo, com diferentes ocorrências, tipos e quantidade em distintas espécies. Associados ao aparelho reprodutor de P. nattereri, os melanócitos foram observados nas gônadas, na albugínea e no interstício, especialmente associado com vasos sangüíneos. A notória presença de numerosas células com pigmento distribuídas no testículo confere uma coloração que varia do preto mesclado com branco ao preto intenso. Trata-se de uma rara peculiaridade e não há informações sobre seu significado funcional ou valor biológico.The testes in the anurans are paired ovoid organs constituted by seminiferous structures surrounded by the

  15. Siluriformes, Loricariidae

    Indian Academy of Sciences (India)

    2013-04-04

    Apr 4, 2013 ... JULIANA DE FÁTIMA MARTINEZ1, ROBERTO LARIDONDO LUI1,. ROBERTO ... Paulo (MZUSP) under voucher numbers MZUSP 110802,. MZUSP .... Foresti F., Oliveira C. and Almeida-Toledo L. F. 1993 A method for.

  16. Heterochromatin analysis in the fish species Liposarcus anisitsi (siluriformes and Leporinus elongatus (characiformes

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    Roberto Ferreira Artoni

    1999-03-01

    Full Text Available The chromosomes of two neotropical freshwater fish species, namely Liposarcus anisitsi (Siluriformes, Loricariidae and Leporinus elongatus (Characiformes, Anostomidae, were investigated by means of C-banding, Ag-NORs, fluorochrome staining and banding by hot saline solution (HSS treatment, to reveal patterns of heterochromatin differentiation. The karyotype of L. anisitsi is described for the first time. Staining with the GC-specific fluorescent antibiotic mithramycin (MM revealed bright signals in some C-banded blocks in both species, suggesting that these MM+ heterochromatin contains GC-rich DNA. Banding by denaturation employing HSS, followed by Giemsa staining, yielded corresponding results documenting the thermal stability of GC-rich DNA part of heterochromatin positive after C-banding. In L. elongatus the Ag-NOR also followed the above banding patterns. However, in L. anisitsi the Ag-NOR was MM+ but negatively stained after C-banding and HSS treatment. L. elongatus also showed C-banded segments that were negative for mithramycin staining and HSS treatment. The results obtained evidence the heterochromatin heterogeneity in these fish species.Cromossomos mitóticos de duas especies de peixes neotropicais, Leporinus elongatus (Characiformes e Liposarcus anisitsi (Siluriformes, foram estudados por diferentes métodos de bandamentos, com o intuito de investigar a diferenciação da heterocromatina. Enquanto que a macroestrutura cariotípica de L. elongatus já foi objeto de estudos anteriores, o cariótipo de L. anisitsi está sendo apresentado pela primeira vez. Em ambas as espécies, a coloração dos cromossomos com a mitramicina (MM, fluorocromo GC específico, evidenciou sinais brilhantes em alguns segmentos heterocromáticos também positivos ao bandamento C, sugerindo ser esta fração da heterocromatina rica em seqüências de bases GC. O tratamento dos cromossomos com solução salina aquecida e posterior coloração com Giemsa

  17. Distribution and habitat suitability index model for the Andean catfish Astroblepus ubidiai (Pisces: Siluriformes in Ecuador

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    Luis A Vélez-Espino

    2006-06-01

    Full Text Available In conservation biology there is a basic need to determine habitat suitability and availability. Astroblepus ubidiai (Siluriforms, the only native fish in the highlands of Imbabura province in the Ecuadorian Andes, was abundant in the past in the Imbakucha watershed and adjacent drainages, but currently it is restricted to a few isolated refuges. Conservation actions are needed if this unique fish is to persist. A Habitat Suitability Index (HSI for the species has been developed in order to aid management decisions. In this HIS model biomass density (B was selected as a better indicator of habitat quality than either abundance or density. A population well-being index (PI was constructed with the combination of B and an indicator of fish health (proportion of fish in the population with parasites and deformities. Based in other models of benthic fish the habitat variables current velocity, flow, depth, width, cover, invertebrate composition, vegetation type, terrestrial vegetation, land use, substrate, temperature, pH, TDS, oxygen, altitude, and slope were included in the analysis. An anthropogenic perturbation index (H and a fragment isolation index (FII were developed and included as habitat variables as well. The HSI model was applied to refuges and a sample of 15 aquatic bodies without fish populations within the study region. From the sampled sites without A. ubidiai 26.6% presented low quality, and the remaining 73.3% had medium quality according to the HSI estimated. Good quality habitat for dispersal, escape or translocations is rare in the region. The low HSIs estimated in some of the refuges suggests that current populations are not settled in the most favorable habitat but in the habitat least favorable to the agents of decline. Rev. Biol. Trop. 54(2: 623-638. Epub 2006 Jun 01.Astroblepus ubidiai (Siluriformes, el único pez nativo de las alturas de Imbabura, en los Andes Ecuatorianos, era un recurso abundante en el pasado

  18. Evidence of niche partitioning under ontogenetic influences among three morphologically similar siluriformes in small subtropical streams.

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    Karine Orlandi Bonato

    Full Text Available Ontogenetic influences in patterns of niche breadth and feeding overlap were investigated in three species of Siluriformes (Heptapterus sp., Rhamdia quelen and Trichomycterus poikilos aiming at understanding the species coexistence. Samplings were conducted bimonthly by electrofishing technique from June/2012 to June/2013 in ten streams of the northwestern state of Rio Grande do Sul, Brazil. The stomach contents of 1,948 individuals were analyzed by volumetric method, with 59 food items identified. In general Heptapterus sp. consumed a high proportion of Aegla sp., terrestrial plant remains and Megaloptera; R. quelen consumed fish, and Oligochaeta, followed by Aegla sp.; while the diet of T. poikilos was based on Simuliidae, Ephemeroptera and Trichoptera. Specie segregation was observed in the NMDS. Through PERMANOVA analysis feeding differences among species, and between a combination of species plus size classes were observed. IndVal showed which items were indicators of these differences. Niche breadth values were high for all species. The niche breadth values were low only for the larger size of R. quelen and Heptapterus sp. while T. poikilos values were more similar. Overall the species were a low feeding overlap values. The higher frequency of high feeding overlap was observed for interaction between Heptapterus sp. and T. poikilos. The null model confirmed the niche partitioning between the species. The higher frequency of high and intermediate feeding overlap values were reported to smaller size classes. The null model showed resource sharing between the species/size class. Therefore, overall species showed a resource partitioning because of the use of occasional items. However, these species share resources mainly in the early ontogenetic stages until the emphasized change of morphological characteristics leading to trophic niche expansion and the apparent segregation observed.

  19. A preliminary inventory of the catfishes of the lower Rio Nhamundá, Brazil (Ostariophysi, Siluriformes

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    Rupert Collins

    2015-04-01

    O Rio Nhamundá é um rio de água clara, pouco conhecido, que drena parte do Escudo das Guianas em território brasileiro. Nesse estudo, nós reportamos os resultados de um levantamento ictiofaunístico preliminar dessa área, tendo como foco os bagres (Siluriformes. Nós identificamos um total de 36 espécies (31 gêneros, sete famílias provenientes de nossa coleta, e adicionamos 11 espécies já conhecidas para o rio. De maneira geral, os resultados de nossa pesquisa mostram que mesmo levantamentos rápidos podem gerar informações importantes sobre a biodiversidade de peixes amazônicos, sugerindo potenciais espécies novas, ampliando a área de distribuição de espécies, além de apontar a necessidade de revisões taxonômicas e estudos genéticos para alguns taxa. Para além das formas tradicionais de dados coletados em pesquisas de biodiversidade (i.e. espécimes preservados, nosso estudo fornece "novas" formas de dados, como DNA barcodes e imagens com o padrão de coloração dos espécimes vivos, informações essas que serão de valor inestimável para futuros estudos que abordem grupos taxonômicos difíceis.

  20. Comparative anatomy of the cheek muscles within the Centromochlinae subfamily (Ostariophysi, Siluriformes, Auchenipteridae).

    Science.gov (United States)

    Sarmento-Soares, Luisa Maria; Porto, Marcovan

    2006-02-01

    Glanidium melanopterum Miranda Ribeiro, a typical representative of the subfamily Centromochlinae (Siluriformes: Auchenipteridae), is herein described myologically and compared to other representative species within the group, Glanidium ribeiroi, G. leopardum, Tatia neivai, T. intermedia, T. creutzbergi, Centromochlus heckelii, and C. existimatus. The structure of seven pairs of striated cephalic muscles was compared anatomically: adductor mandibulae, levator arcus palatini, dilatator operculi, adductor arcus palatini, extensor tentaculi, retractor tentaculi, and levator operculi. We observed broad adductor mandibulae muscles in both Glanidium and Tatia, catfishes with depressed heads and smaller eyes. Similarities between muscles were observed: the presence of a large aponeurotic insertion for the levator arcus palatini muscle; an adductor arcus palatini muscle whose origin spread over the orbitosphenoid, pterosphenoid, and parasphenoid; and the extensor tentaculi muscle broadly attached to the autopalatine. There is no retractor tentaculi muscle in either the Glanidium or Tatia species. On the other hand, in Centromochlus, with forms having large eyes and the tallest head, the adductor mandibulae muscles are slim; there is a thin aponeurotic or muscular insertion for the levator arcus palatini muscle; the adductor arcus palatini muscle originates from a single osseous process, forming a keel on the parasphenoid; the extensor tentaculi muscle is loosely attached to the autopalatine, permitting exclusive rotating and sliding movements between this bone and the maxillary. The retractor tentaculi muscle is connected to the maxilla through a single tendon, so that both extensor and retractor tentaculi muscles contribute to a wide array of movements of the maxillary barbels. A discussion on the differences in autopalatine-maxillary movements among the analyzed groups is given. (c) 2005 Wiley-Liss, Inc.

  1. Inversión ocular en Paralichthys adspersus (Steindachner, 1867 lenguado de ojos chicos (Pleuronectiformes, Paralichthyidae: un caso del ambiente y un análisis en ejemplares cultivados

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    Héctor Flores

    2013-03-01

    Full Text Available En diversas especies de Pleuronectiformes se han registrado casos de inversión ocular, fenómeno, en que el individuo reposa en el fondo por el lado contrario al habitual y/o normal. La proporción en que se presenta esta condición es variable y depende de las especies que se analicen. En el género Paralichthys se ha reportado inversión ocular en cuatro especies: P. albigutta, P. orbignyanus, P. californicus y P. dentatus. En el presente trabajo, se informa la captura de un ejemplar silvestre de Paralichthys adspersus (Steindachner, 1867, con inversión ocular, capturado en Caldera (Chile. También, se han reportado individuos invertidos de esta especie provenientes de un cultivo, a partir de reproductores que fueron capturados en Bahía Coquimbo. En ejemplares diestros y siniestros proveniente de cultivo, se efectuó comparación de relaciones morfométricas. La proporción de peces con inversión ocular y que provienen de un cultivo, representa 2,2% de la población de peces producidos. Se discute la frecuencia de este tipo de anomalías y las probables causas que las estarían produciendo.

  2. A new pale-spotted species of Hypostomus Lacépède (Siluriformes: Loricariidae from the rio Tocantins and rio Xingu basins in central Brazil

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    Cláudio H. Zawadzki

    Full Text Available A new species of the genus Hypostomus Lacépède (Siluriformes, Loricariidae from rio Tocantins and rio Xingu basins in central Brazil, is described. The new species is distinguished from its congeners by a unique combination of pale blotches over a darker background on head, body and fins, and conspicuous keels on head, predorsal region and lateral plates. Comments on the pale-spotted species of Hypostomus are provided.

  3. Monogeneans from Pangasiidae (Siluriformes in Southeast Asia: VII. Six new host-specific species of Thaparocleidus Jain, 1952 (Ancylodiscoididae from Pangasius polyuranodon

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    Pariselle A.

    2004-12-01

    Full Text Available The examination of gill parasites from Pangasius polyuranodon Bleeker, 1852 (Siluriformes, Pangasiidae revealed the presence of six new host-specific species of Monogenea, all belonging to Thaparocleidus Jain, 1952 (Monogenea, Ancylodiscoididae as defined by Lim (1996 and Lim et al. (2001: T. caestus n. sp., T. crassipenis n. sp., T. legendrei n. sp., T. levangi n. sp., T. slembroucki n. sp. and T. virgula n. sp.

  4. Quadriacanthus species (Monogenea: Dactylogyridae) from catfishes (Teleostei: Siluriformes) in eastern Africa: new species, new records and first insights into interspecific genetic relationships

    Czech Academy of Sciences Publication Activity Database

    Francová, K.; Seifertová, M.; Blažek, Radim; Gelnar, M.; Mahmoud, Z. N.; Řehulková, E.

    2017-01-01

    Roč. 10, č. 361 (2017), č. článku 361. ISSN 1756-3305 R&D Projects: GA ČR(CZ) GBP505/12/G112 Institutional support: RVO:68081766 Keywords : Monogenea * Dactylogyridae * Quadriacanthus * Siluriformes * Catfishes * Africa * Lake Turkana * Nile River Basin * New species * DNA Subject RIV: EG - Zoology OBOR OECD: Parasitology Impact factor: 3.080, year: 2016

  5. Cytogenetic analyses of two endemic fish species from the São Francisco River basin: Conorhynchus conirostris and Lophiosilurus alexandri (Siluriformes

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    Marilza Barbosa de Almeida Marques

    2008-01-01

    Full Text Available Two Siluriformes species endemic to the São Francisco River basin were characterized by conventional and differential cytogenetic analyses involving C-banding, Ag-nucleolar organizer region (NOR and chromomycin A3 (CMA3 staining, and FISH (fluorescent in situ hybridization with 18S and 5S rDNA probes. Conorhynchus conirostris presents a higher diploid number (2n = 60 than those detected in Pimelodidae representatives, whereas Lophiosilurus alexandri, with a karyotype of 2n = 54 chromosomes, presents a chromosomal constitution similar to that found in the family Pseudopimelodidae. Plesiomorphic characteristics such as single NORs at terminal positions are found in both species, as revealed by CMA3 and silver nitrate staining, and FISH with a 18S rDNA probe. C-banding evidenced centromeric and telomeric heterochromatic blocks distributed over most of the chromosomes with a conspicuous heterochromatin segment in a pair of submetacentric chromosomes in L. alexandri. Such karyotype data, if compared to the cytogenetic pattern of other Siluriformes species, can be partially related to their degree of endemism, favorable to the occurrence and fixation of chromosomal rearrangements. The present study in representatives from these two Siluriformes families from the São Francisco River contributes to a better understanding of the karyotype evolution in species of this important order of Neotropical fishes.

  6. Complete mitochondrial genome from South American catfish Pseudoplatystoma reticulatum (Eigenmann & Eigenmann) and its impact in Siluriformes phylogenetic tree.

    Science.gov (United States)

    Villela, Luciana Cristine Vasques; Alves, Anderson Luis; Varela, Eduardo Sousa; Yamagishi, Michel Eduardo Beleza; Giachetto, Poliana Fernanda; da Silva, Naiara Milagres Augusto; Ponzetto, Josi Margarete; Paiva, Samuel Rezende; Caetano, Alexandre Rodrigues

    2017-02-01

    The cachara (Pseudoplatystoma reticulatum) is a Neotropical freshwater catfish from family Pimelodidae (Siluriformes) native to Brazil. The species is of relative economic importance for local aquaculture production and basic biological information is under development to help boost efforts to domesticate and raise the species in commercial systems. The complete cachara mitochondrial genome was obtained by assembling Illumina RNA-seq data from pooled samples. The full mitogenome was found to be 16,576 bp in length, showing the same basic structure, order, and genetic organization observed in other Pimelodidae, with 13 protein-coding genes, 2 rNA genes, 22 trNAs, and a control region. Observed base composition was 24.63% T, 28.47% C, 31.45% A, and 15.44% G. With the exception of NAD6 and eight tRNAs, all of the observed mitochondrial genes were found to be coded on the H strand. A total of 107 SNPs were identified in P. reticulatum mtDNA, 67 of which were located in coding regions. Of these SNPs, 10 result in amino acid changes. Analysis of the obtained sequence with 94 publicly available full Siluriformes mitogenomes resulted in a phylogenetic tree that generally agreed with available phylogenetic proposals for the order. The first report of the complete Pseudoplatystoma reticulatum mitochondrial genome sequence revealed general gene organization, structure, content, and order similar to most vertebrates. Specific sequence and content features were observed and may have functional attributes which are now available for further investigation.

  7. Reproductive plasticity of Hypostomus affinis (Siluriformes: Loricariidae as a mechanism to adapt to a reservoir with poor habitat complexity

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    Silvana Duarte

    2011-10-01

    Full Text Available In this work we describe the gonad morphology and spawning season of Hypostomus affinis (Steindachner, 1877 in a tropical reservoir based on 55 males and 125 females. Our aim was to assess eventual adaptations in reproductive tactics developed by this riverine species inhabiting an oligotrophic reservoir with low habitat complexity, few rocks and few other preferred consolidated substrata. We described the stages of cells of reproductive lineage, gonadal development and some reproductive traits which were compared with information in the available literature. Cells from the spermatogenic lineage were spermatogonia, spermatocytes, spermatids and spermatozoa, and cells from the oocytarian lineage were primary oocytes, previtelogenic oocytes, cortical vesicle oocytes and yolk globules or vitellogenic. Five stages were described for the males/females according to the distribution of oocytes and spermatogenic lineage cells: resting; initial maturation; advanced maturation; partially spent/spawned; totally spent/spawn. Females outnumbered males and reached larger size. Synchronic ovary development in two groups was found with diameter of mature oocytes ranging from 2 to 3.35 mm. Indication of early maturation, a longer reproductive period and the production of smaller eggs in small clutches seems to be features of the reservoir population not found in riverine systems. Such changes in tactics may indicate a shift to an opportunistic strategy, helping the population to withstand environmental constraints and to succeed in this oligotrophic and poorly structured reservoir.

  8. Indicadores do desenvolvimento gonadal e nutricional de Prochilodus cearensis (Steindachner, 1911 (Characiformes, Prochilodontidae no açude Itans/Caicó, Rio Grande do Norte, Brasil - DOI: 10.4025/actascibiolsci.v25i2.2027 Gonadal and nutritional indexes influencing the reproductive behavior of Prochilodus cearensis (Steindachner, 1911 (Characiformes, Prochilodontidae in Itans water reservoir, Caicó, Rio Grande do N - DOI: 10.4025/actascibiolsci.v25i2.2027

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    Helio de Castro Bezerra Gurgel

    2003-04-01

    Full Text Available Analisaram-se alguns aspectos da reprodução e do estado nutricional de 213 exemplares (160 fêmeas e 53 machos de Prochilodus cearensis no açude Itans/ Caicó no Estado do Rio Grande do Norte, Brasil, no período de abril de 1996 a janeiro de 1997. As médias dos valores dos índices gônadossomático e gonadal apresentaram-se mais elevadas para fêmeas e machos no mês de janeiro. O índice de repleção foi semelhante entre os sexos. O fator de condição (ø mostrou-se mais elevado no período que antecede à reprodução. Não foi observada correlação significativa entre os fatores abióticos e o ciclo reprodutivo da espécie. No entanto, a presença de indivíduos com gônadas preparadas para a reprodução no trimestre que antecede ao das chuvas sugere que a desova possa estar condicionada a sua ocorrênciaThe aim of this study was to investigate the influence of gonadal and nutritional index on reproductive behavior of Prochilodus cearensis (Steindachner, 1911 (Characiformes, Prochilodontidae in Itans water reservoir, Caicó, Rio Grande do Norte. 213 animals were used (160 females and 53 males and collected from Itans water reservoir during the period from April 1996 to January 1997. The highest Gonadossomatic and Gonadal Index values were obtained for females and males from December to February. The repletion index was similar for males and females. The condition factor (ø showed the highest value just before reproduction. Data collected suggest that reproductive cycle in this species is not directly related to abiotic factors

  9. Monogeneans from Pangasiidae (Siluriformes in Southeast Asia: I. Five new species of Thaparocleidus Jain, 1952 (Ancylodiscoidinae from Pangasius pangasius, P. kinabatanganensis, P. rheophilus and P. nieuwenhuisii

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    Pariselle A.

    2001-06-01

    Full Text Available The examination of gill parasites from Pangasius pangasius (Hamilton, 1822 ; P. kinabatanganensis Roberts & Vidthayanon, 1991 ; P. rheophilus Pouyaud & Teugels, 2000 and P. nieuwenbuisii (Popta, 1904 (Siluriformes, Pangasiidae in Southeast Asia revealed the presence of six species of Thaparocleidus Jain, 1952 (Monogenea, Ancylodiscoidinae. One has been previously described from P. pangasius: T. pangasi (Tripathi, 1957. The other five are new species: T. chandpuri n. sp. from P. pangasius; T. bahari n. sp. and T. sabanensis n. sp. from P. kinabatanganensis; T. redebensis n. sp. from P. rheophilus and T. mahakamensis n. sp. from P. nieuwenhuisii.

  10. Identification of distinct evolutionary units in allopatric populations of Hypostomus cf. wuchereri Günther, 1864 (Siluriformes: Loricariidae: karyotypic evidence

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    Jamille de Araújo Bitencourt

    Full Text Available Few chromosomal reports are available for the endemic fish fauna from coastal basins in northeastern Brazil, and regional biodiversity remains partially or completely unknown. This is particularly true for Loricariidae, the most diverse family of armored catfishes. In the present work, allopatric populations of Hypostomus cf. wuchereri (Siluriformes: Loricariidae from two basins in Bahia (northeastern Brazil were cytogenetically analyzed. Both populations shared 2n = 76 chromosomes, a karyotype formula of 10m+18sm+48st/a (FN = 104 and single terminal GC-rich NORs on the second metacentric pair. Nevertheless, microstructural differences were detected by C-banding, fluorochrome staining and chromosomal digestion with restriction enzymes (Alu I, Bam HI, Hae III, and Dde I. The population from Una River (Recôncavo Sul basin showed conspicuous heterochromatin blocks and a remarkable heterogeneity of base composition (presence of interspersed AT/GC-rich and exclusively AT- or GC-rich sites, while the population from Mutum river (Contas River basin presented interstitial AT-rich C-bands and terminal GC/AT-rich heterochromatin. Each enzyme yielded a specific band profile per population which allowed us characterizing up to five heterochromatin families in each population. Based on the present data, we infer that these populations have been evolving independently, as favored by their geographic isolation, probably representing cryptic species.

  11. Desenvolvimento gonadal do jundiá, Rhamdia quelen (Teleostei, Siluriformes, em viveiros de terra, na região sul do Brasil = Gonadal development of jundiá, Rhamdia quelen (Teleostei, Siluriformes, in earthen ponds in southern Brazil

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    Luciana Ghiraldelli

    2007-10-01

    Full Text Available O presente estudo caracterizou o desenvolvimento gonadal de jundiá até a maturação sexual, quando cultivados em viveiros de terra, visando subsidiar o desenvolvimento de tecnologia de cultivo para esta espécie na região sul do Brasil. Alevinos de jundiá (peso médio 8 ± 3,73 g foram estocados em três viveiros, na densidade de 0,6indivíduos m-2. Catorze indivíduos foram amostrados mensalmente, de setembro de 2001 a outubro de 2002. Os estádios de maturação gonadal foram caracterizados macroscopicamente, e fragmentos de ovários e testículos de alguns exemplares foram fixados em formalina 4% para análise histológica. Foram analisados 118 exemplares: 60 machos e 58 fêmeas. Os machos apresentaram atividade reprodutiva precoce, quandocomparados às fêmeas. Testículos e ovários apresentaram morfologia similar a de outras espécies de Siluriformes. De acordo com a análise microscópica, as gônadas foram classificadas em quatro estádios de desenvolvimento: imaturo, em maturação inicial, em maturação final e maduro. A relação gonadossomática variou de 0,29 a 9,16 para os machose de 0,11 a 13,03 para as fêmeas. Indivíduos maduros foram observados nos meses de verão (dezembro/2001 e janeiro/2002, outono (abril e maio/2002 e primavera (setembro e outubro/2002, acompanhando o aumento de temperatura.The study characterized the gonadal development of jundiá from approximately 8 g until gonadal maturation, to provide further knowledge for farming jundiá in Southern Brazil. Jundiá fingerlings(average weight 8.00 ± 3.73 g were stocked in three ponds at 0.6 fish m-2. Fourteen fish were sampled each month from September 2001 to October 2002. Gonadal maturation stages were characterized macroscopically, and samples of ovaries and testicles were fixedin 4-%-buffered formalin for histological examination. One hundred and eighteen fish were analyzed: 60 males e 58 females. Jundiá males matured earlier than females. Testicles and

  12. Genetic and Morphological Analyses Demonstrate That Schizolecis guntheri (Siluriformes: Loricariidae) Is Likely to Be a Species Complex

    Science.gov (United States)

    Souza, Camila S.; Costa-Silva, Guilherme J.; Roxo, Fábio F.; Foresti, Fausto; Oliveira, Claudio

    2018-01-01

    Schizolecis is a monotypic genus of Siluriformes widely distributed throughout isolated coastal drainages of southeastern Brazil. Previous studies have shown that fish groups found in isolated river basins tend to differentiate over time in the absence of gene flow, resulting in allopatric speciation. In this study, we used partial sequences of the mitochondrial gene COI with the analysis of the General Mixed Yule Coalescent model (GMYC) and the Automatic Barcode Gap Discovery (ABGD) for single locus species delimitation, and a Principal Component Analysis (PCA) of external morphology to test the hypothesis that Schizolecis guntheri is a complex of species. We analyzed 94 samples of S. guntheri for GMYC and ABGD, and 82 samples for PCA from 22 coastal rivers draining to the Atlantic in southeastern Brazil from the Paraná State to the north of the Rio de Janeiro State. As a result, the GMYC model and the ABGD delimited five operational taxonomy units (OTUs – a nomenclature referred to in the present study of the possible new species delimited for the genetic analysis), a much higher number compared to the traditional alfa taxonomy that only recognizes S. guntheri across the isolated coastal rivers of Brazil. Furthermore, the PCA analysis suggests that S. guntheri is highly variable in aspects of external body proportions, including dorsal-fin spine length, pectoral-fin spine length, pelvic-fin spine length, lower caudal-fin spine length, caudal peduncle depth, anal width and mandibular ramus length. However, no exclusive character was found among the isolated populations that could be used to describe a new species of Schizolecis. Therefore, we can conclude, based on our results of PCA contrasting with the results of GMYC and ABGD, that S. guntheri represents a complex of species. PMID:29552028

  13. Genetic and Morphological Analyses Demonstrate That Schizolecis guntheri (Siluriformes: Loricariidae) Is Likely to Be a Species Complex.

    Science.gov (United States)

    Souza, Camila S; Costa-Silva, Guilherme J; Roxo, Fábio F; Foresti, Fausto; Oliveira, Claudio

    2018-01-01

    Schizolecis is a monotypic genus of Siluriformes widely distributed throughout isolated coastal drainages of southeastern Brazil. Previous studies have shown that fish groups found in isolated river basins tend to differentiate over time in the absence of gene flow, resulting in allopatric speciation. In this study, we used partial sequences of the mitochondrial gene COI with the analysis of the General Mixed Yule Coalescent model (GMYC) and the Automatic Barcode Gap Discovery (ABGD) for single locus species delimitation, and a Principal Component Analysis (PCA) of external morphology to test the hypothesis that Schizolecis guntheri is a complex of species. We analyzed 94 samples of S. guntheri for GMYC and ABGD, and 82 samples for PCA from 22 coastal rivers draining to the Atlantic in southeastern Brazil from the Paraná State to the north of the Rio de Janeiro State. As a result, the GMYC model and the ABGD delimited five operational taxonomy units (OTUs - a nomenclature referred to in the present study of the possible new species delimited for the genetic analysis), a much higher number compared to the traditional alfa taxonomy that only recognizes S. guntheri across the isolated coastal rivers of Brazil. Furthermore, the PCA analysis suggests that S. guntheri is highly variable in aspects of external body proportions, including dorsal-fin spine length, pectoral-fin spine length, pelvic-fin spine length, lower caudal-fin spine length, caudal peduncle depth, anal width and mandibular ramus length. However, no exclusive character was found among the isolated populations that could be used to describe a new species of Schizolecis . Therefore, we can conclude, based on our results of PCA contrasting with the results of GMYC and ABGD, that S. guntheri represents a complex of species.

  14. Genetic and Morphological Analyses Demonstrate That Schizolecis guntheri (Siluriformes: Loricariidae Is Likely to Be a Species Complex

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    Camila S. Souza

    2018-03-01

    Full Text Available Schizolecis is a monotypic genus of Siluriformes widely distributed throughout isolated coastal drainages of southeastern Brazil. Previous studies have shown that fish groups found in isolated river basins tend to differentiate over time in the absence of gene flow, resulting in allopatric speciation. In this study, we used partial sequences of the mitochondrial gene COI with the analysis of the General Mixed Yule Coalescent model (GMYC and the Automatic Barcode Gap Discovery (ABGD for single locus species delimitation, and a Principal Component Analysis (PCA of external morphology to test the hypothesis that Schizolecis guntheri is a complex of species. We analyzed 94 samples of S. guntheri for GMYC and ABGD, and 82 samples for PCA from 22 coastal rivers draining to the Atlantic in southeastern Brazil from the Paraná State to the north of the Rio de Janeiro State. As a result, the GMYC model and the ABGD delimited five operational taxonomy units (OTUs – a nomenclature referred to in the present study of the possible new species delimited for the genetic analysis, a much higher number compared to the traditional alfa taxonomy that only recognizes S. guntheri across the isolated coastal rivers of Brazil. Furthermore, the PCA analysis suggests that S. guntheri is highly variable in aspects of external body proportions, including dorsal-fin spine length, pectoral-fin spine length, pelvic-fin spine length, lower caudal-fin spine length, caudal peduncle depth, anal width and mandibular ramus length. However, no exclusive character was found among the isolated populations that could be used to describe a new species of Schizolecis. Therefore, we can conclude, based on our results of PCA contrasting with the results of GMYC and ABGD, that S. guntheri represents a complex of species.

  15. The fishery of tamoatá Hoplosternum littorale (Hancock, 1828 (Siluriformes: Callichthyidae in the Marajó Island

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    Adna Almeida de Albuquerque

    2008-12-01

    Full Text Available Hoplosternum littorale (Hancock, 1828 (Siluriformes, Callichthyidae is a middle size catfish, known in the Brazilian Amazon as ‘tamoatá’. It uses an accessory air-breathing organ to live in the poor oxygen swamps of the mouth of Amazon and Orinoco rivers. The tamoatá is the main fishery resource of the Marajó Island and it is caught in the flooded savanna of the Arari River basin, near the Santa Cruz do Arari city, Pará State. The tamoatá landing in the port of Ver-o-Peso, in Belém, represents about 6% of the total fish landing. The tamoatá fishery is seasonal, occurring mainly in the dry season. The fishery occurs in the river and lake environments, during July and August, and moves to the pools in the farms, which are the last to be dried in the region, during October and November. People that live in the region also do the fishery, and they sell production to fishing boats sellers, called locally as ‘geleiras’. Those boats are made of wood and carry the fish in iceboxes. The fishes are sold at the ports of important cities, in special the Ver-o-Peso port. The fishery activity is here described based on the interviews with fishermen and local inhabitants. Along the period of this study, were registered 415 boats carrying the tamoatá to Belém. The icebox capacities in the boats were until to 27 tons. The fishery gears used were gillnet and seine net.

  16. Metazoan parasites of Mandi-amarelo Pimelodus maculatus and of Jundiá Rhamdia quelen (Osteichthyes: Siluriformes) of Paraíba do Sul River, Volta Redonda, Rio de Janeiro.

    Science.gov (United States)

    Venancio, Aline Cristine Pinto; de Aguiar, Gesilene Ribeiro; Lopes, Patrícia da Silva; Alves, Dimitri Ramos

    2010-01-01

    Forty-one specimens of mandi-amarelo Pimelodus maculatus Lacépède, 1803 (Siluriformes: Pimelodidae) and 54 specimens of jundiá Rhamdia quelen (Quoy & Gaimard, 1824) (Siluriformes: Heptapteridae) were collected from the Paraíba do Sul River, Volta Redonda, State of Rio de Janeiro, Brazil between November 2007 and October 2008. These fish underwent necropsy so their infracommunities of metazoan parasites could be studied. The same three species of parasites were collected in the two fish species studied. These were one monogenean, one nematode, and one hirudinean. Cucullanus pinnai (Travassos, Artiga, and Pereira, 1928) (Nematoda: Cucullanidae) and Aphanoblastella sp. (Monogenea: Dactylogyridae) were the dominant species with the highest prevalence in P. maculatus and R. quelen. The parasite species of P. maculatus and R. quelen showed an atypical over-dispersed pattern of distribution. No parasite species showed significant correlation between the body total length of the siluriform hosts and their prevalence and abundance. The parasite species richness showed a mean value of 0.87 ± 0.67 (0-2) and 0.57 ± 0.56 (0-2) in P. maculatus and R. quelen, respectively, and no correlation with the body total length.

  17. A new dark-dotted species of Hypostomus Lacépède (Siluriformes: Loricariidae from rio Paraguaçu, Bahia State, Brazil

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    Angela M. Zanata

    Full Text Available A new species of Hypostomus Lacépède is described from the rio Paraguaçu basin, Bahia State, Brazil. The new species is distinguished from its congeners by having black and conspicuous dots on a pale background, which are similar in size on the head, trunk, and fins, along with ventral surface of head and abdomen naked or the latter plated exclusively on its anterior portion, absence of ridges on head and trunk, and caudal-fin lobes relatively similar in length. The new species further differs from the sympatric H. chrysostiktos by having seven branched dorsal-fin rays instead of 10-11 and represents the eleventh siluriform species endemic to the rio Paraguaçu basin.

  18. Monogeneans from Pangasiidae (Siluriformes in Southeast Asia: III. Five new species of Thaparocleidus Jain, 1952 (Ancylodiscoididae from Pangasius bocourti, P. djambal and P. hypophthalmus

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    Pariselle A.M.

    2002-09-01

    Full Text Available The examination of gill parasites from Pangasius bocourti Sauvage, 1880; P. djambal Bleeker, 1846; P. hypophthalmus (Sauvage, 1878 and P. gigas Chevey, 1930 (Siluriformes, Pangasiidae revealed the presence of seven species of Monogenea among which five are considered new species. They all belong to Thaparocleidus Jain, 1952 (Ancylodiscoididae as defined by Lim (1996 and Lim et al. (2001. . P. bocourti: T. combesi n. sp.: T. komarudini n. sp. and T. vietnamensis n. sp. . P. djambal: T. caecus (Mizelle & Kritsky, 1969, T. combesi n. sp., T. euzeti n. sp., T. komarudini n. sp. and T. sadilii n. sp. . P. hypophthalmus: T. caecus, T. siamensis (Lim, 1990 and T. vietnamensis n. sp. . P. gigas : no Monogenea were found on this host species.

  19. Histología y morfometría de piel del pez Eremophilus mutisii (Trychomecteridae, Siluriformes

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    Rocío Johanna Bonilla Lizarazo

    2008-06-01

    Full Text Available Se estudió la piel del pez dulceacuícola endémico de Colombia Eremophylus mutissi. Se tomaron muestras de piel (0.5x0.5 cm² de 11 especimenes en seis partes del cuerpo (mandíbulas, cabeza dorsal, tronco dorsal, tronco caudal, tronco medial y abdominal. Se fijaron en formaldehído al 4%, con deshidratación en etanol al 95 % e isopropanol al 99%, inclusión en parafina y cortes a 5 µm. La piel está constituida por dos capas cutáneas (epidermis y dermis y una capa subcutánea (hipodermis: la epidermis tiene tres capas con células secretoras, células epiteliales y pocas células gustativas; la dermis está separada de la epidermis por una membrana basal. Observamos fibroblastos, dos capas de melanóforos y algunos vasos sanguíneos; la hipodermis tiene un tejido adiposo vascularizado. La dermis es más delgada que la epidermis; la piel tiene más células tipo clava que células mucosas. El tronco medio tiene muchas células clava y células mucosas. La piel de E. mutissi parece tener una función principalmente protectora.Skin histology and morphometry of the fish Eremophilus mutisii (Trychomecteridae, Siluriformes. The tropical freshwater fish Eremophylus mutisii is endemic to the Cundinamarca highland in Colombia. Skin samples (0.5x0.5 cm² were taken from 11 specimens at six body parts (mandible, dorsal head, dorsal trunk, caudal trunk, medial trunk and abdominal area, fixed in 4% formaldehyde, dehydrated in 95% ethanol and 99% isopropanol, embedded in paraffin and sectioned at 5 µm. The skin is made of two mayor cutaneous layers (epidermis and dermis and a subcutaneous layer (hypodermis. The epidermis presents three layers with secretory cells, epithelial cells and a few taste buds; the dermis is separated from the epidermis by a basal membrane. We observed fibroblasts, two layers of melanophors and some blood vessels; the hypodermis has vascularized adipose tissue. Skin thickness changes with body area; the dermis is thicker than

  20. El pez Trachelyopterus striatulus (Siluriformes: Auchenipteridae como herramienta de muestreo de la entomofauna en un embalse tropical

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    Alejandra Filippo Gonzalez Neves dos Santos

    2009-12-01

    Full Text Available El objetivo de este trabajo fue hacer un levantamiento entomofaunístico, en un embalse Tropical, utilizando como organismo indicador al pez Trachelyopterus striatulus. Fue analizada la dieta de 383 T. striatulus, muestreados desde abril de 1999 hasta marzo de 2000. La Frecuencia de presencia y el porcentaje de similitud de Schoener fueron aplicados para analizar la dieta. Para identificar variaciones de la entomofauna entre las estaciones del año y las zonas del embalse fueron aplicadas estadísticas univariadas y multivariadas. La dieta estuvo compuesta principalmente por insectos (92.14% siendo los más frecuentes (%FO: Hymenoptera (57.90%, Odonata (39.76%, Trichoptera (27.41%, Ephemeroptera (26.25% y Coleoptera (28.96%. Formicidae fue dominante en todas las estaciones del año, en especial en la primavera, mientras, Trichoptera y Ephemeroptera fueron más consumidos en las demás estaciones del año. En la zona alta, predominaron Trichoptera y Ephemeroptera, mientras en las zonas baja e intermedia predominaron Formicidae y Belostomatidae. T. striatulus presenta potencial como muestreador de la entomofauna contribuyendo para el conocimiento de la biología y ecología de los insectos y la ecología trófica de los organismos acuáticos.The fish Trachelyopterus striatulus (Siluriforms: Auchenipteridae used to sample insects in a tropical reservoir. The study of aquatic environments is sometimes difficult to do with normal sampling methods that use gears. Insectivorous fishes represent good users of these ecosystems and analyzing the aquatic organisms present in fish stomachs, is an alternative way to determine resource abundance and utilization. In this paper, the potential of Trachelyopterus striatulus as an insect sampler was examined through dietary analyses of 383 individuals caught between April 1999 and March 2000 in Lajes Reservoir, a 30 km² oligotrophic impoundment in Southeast Brazil. We estimated frequency of occurrence and

  1. Electrophoretic study on intraspecific variations and interspecific relationships of marine catfishes (Siluriformes, Ariidae of Cananéia (São Paulo, Brazil: 1. General proteins of eye-lens and skeletic muscle

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    Hana Suzuki

    1990-06-01

    Full Text Available Cellulose acetate electrophoresis of eye-lens proteins and Polyacrylamide flat gel electrophoresis of skeletic muscle proteins of six species of marine catfishes were carried out. Genetic polymorphism only occured at one locus of the electropherograms of eye-lens of Cathorops spixii. Ontogenetic variations in the relative concentration of bands were found in the electropherograms of eye-lens and skeletic muscle proteins. The six species of catfishes can be identified by means of quantitative and qualitative differences in the electropherograms. Coefficients of similarity were determined by the band-counting method and UPGMA dendrograms were constructed to illustrate the interspecific relationships among the species.Eletroforeses de proteínas gerais de cristalinos e de músculo esquelético de seis espécies de bagres marinhos foram realizadas, respectivamente, em membranas de acetato de celulose e em géis de poliacrilamida. Polimorfismo genético ocorreu apenas em um locus de eletroferogramas do cristalino de Cathorops spixii. Variações ontogenéticas nas concentrações relativas das bandas foram observadas nos eletroferogramas do cristalino e do músculo esquelético. As seis espécies de bagres marinhos podem ser identificadas através das diferenças quantitativas e qualitativas nos eletroferogramas. Coeficientes de similaridade foram determinadas pelo método de contagem de bandas e dendrogramas UPGMA foram construídos para ilustrar as relações interespecíficas entre as espécies.

  2. Blood flukes (Digenea: Aporocotylidae) of walking catfishes (Siluriformes: Clariidae): new genus and species from the Mekong River (Vietnam) with comments on related catfish aporocotylids.

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    Truong, Triet Nhat; Bullard, Stephen A

    2013-07-01

    Nomasanguinicola canthoensis gen. et sp. n. infects the branchial vessels of bighead catfish, Clarias macrocephalus Günther (Siluriformes: Clariidae), in the Mekong River near Can Tho, southern Vietnam. Nomasanguinicola differs from all other genera of fish blood flukes (Digenea: Aporocotylidae) by the combination of lacking body spines and by having an anterior sucker with two flanking columns of large denticles, an intestine comprising several short papilla-like caeca, an inverse U-shaped uterus, and an ootype located near the separate genital pores. The new species has an ootype that is posterior to the level of the female genital pore. That feature most easily differentiates it from the only other putative aporocotylid species having an anterior sucker with two flanking columns of large denticles, Plehniella dentata Paperna, 1964 and Sanguinicola clarias Imam, Marzouk, Hassan et Itman, 1984, which have an ootype that is lateral (P. dentata) or anterior (S. clarias) to the level of the female genital pore. These two species apparently lack extant type materials, infect North African catfish, Clarias gariepinus (Burchell), and herein are considered incertae sedis, but likely comprise species of Nomasanguinicola. An updated list of hosts, sites of infection and geographic localities for the six species and three genera of blood flukes that mature in catfishes is provided. The new species is the first fish blood fluke recorded from Vietnam and only the third reported from a walking catfish (Clariidae).

  3. A new genus and species of marine catfishes (Siluriformes; Ariidae) from the upper Eocene Birket Qarun Formation, Wadi El-Hitan, Egypt.

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    El-Sayed, Sanaa E; Kora, Mahmoud A; Sallam, Hesham M; Claeson, Kerin M; Seiffert, Erik R; Antar, Mohammed S

    2017-01-01

    Wadi El-Hitan, the UNESCO World Heritage Site, of the Fayum Depression in the northeast part of the Western Desert of Egypt, has produced a remarkable collection of Eocene vertebrates, in particular the fossil whales from which it derives its name. Here we describe a new genus and species of marine catfishes (Siluriformes; Ariidae), Qarmoutus hitanensis, from the base of the upper Eocene Birket Qarun Formation, based on a partial neurocranium including the complete left side, partial right dentary, left suspensorium, two opercles, left pectoral girdle and spine, nuchal plates, first and second dorsal spines, Weberian apparatus and a disassociated series of abdominal vertebrae. All of the elements belong to the same individual and some of them were found articulated. Qarmoutus gen. nov. is the oldest and the most complete of the Paleogene marine catfishes unearthed from the Birket Qarun Formation. The new genus exhibits distinctive features not seen in other African Paleogene taxa, such as different sculpturing on the opercle and pectoral girdle with respect to that on the neurocranium and nuchal plates, denticulate ornamentation on the skull bones arranged in longitudinal rows and forming a radiating pattern on the sphenotic, pterotic, extrascapular and the parieto-supraoccipital, indentations or pitted ornamentation on the nuchal plates as well as the parieto-supraoccipital process, strut-like radiating pattern of ornamentation on the opercle from the proximal articulation to margins, longitudinal, curved, reticulate ridges and tubercular ornamentations on the cleithrum, sinuous articulation between the parieto-supraoccipital process and the anterior nuchal plate, long, narrow, and arrowhead shaped nuchal shield, very small otic capsules restricted to the prootic. Multiple parsimony and Bayesian morphological phylogenetic analyses of Ariidae, run with and without "molecular scaffolds", yield contradictory results for the placement of Qarmoutus; the genus is either

  4. A new genus and species of marine catfishes (Siluriformes; Ariidae from the upper Eocene Birket Qarun Formation, Wadi El-Hitan, Egypt.

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    Sanaa E El-Sayed

    Full Text Available Wadi El-Hitan, the UNESCO World Heritage Site, of the Fayum Depression in the northeast part of the Western Desert of Egypt, has produced a remarkable collection of Eocene vertebrates, in particular the fossil whales from which it derives its name. Here we describe a new genus and species of marine catfishes (Siluriformes; Ariidae, Qarmoutus hitanensis, from the base of the upper Eocene Birket Qarun Formation, based on a partial neurocranium including the complete left side, partial right dentary, left suspensorium, two opercles, left pectoral girdle and spine, nuchal plates, first and second dorsal spines, Weberian apparatus and a disassociated series of abdominal vertebrae. All of the elements belong to the same individual and some of them were found articulated. Qarmoutus gen. nov. is the oldest and the most complete of the Paleogene marine catfishes unearthed from the Birket Qarun Formation. The new genus exhibits distinctive features not seen in other African Paleogene taxa, such as different sculpturing on the opercle and pectoral girdle with respect to that on the neurocranium and nuchal plates, denticulate ornamentation on the skull bones arranged in longitudinal rows and forming a radiating pattern on the sphenotic, pterotic, extrascapular and the parieto-supraoccipital, indentations or pitted ornamentation on the nuchal plates as well as the parieto-supraoccipital process, strut-like radiating pattern of ornamentation on the opercle from the proximal articulation to margins, longitudinal, curved, reticulate ridges and tubercular ornamentations on the cleithrum, sinuous articulation between the parieto-supraoccipital process and the anterior nuchal plate, long, narrow, and arrowhead shaped nuchal shield, very small otic capsules restricted to the prootic. Multiple parsimony and Bayesian morphological phylogenetic analyses of Ariidae, run with and without "molecular scaffolds", yield contradictory results for the placement of Qarmoutus

  5. Influence of season, environment and feeding habits on the enzymatic activity of peptidase and β-glucosidase in the gastrointestinal tract of two Siluriformes fishes (Teleostei

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    Silvana Duarte

    2013-06-01

    Full Text Available The enzymatic activities involved in the digestion of proteins and carbohydrates were compared among three organs of the digestive track of two Siluriformes fish species, and between two areas: a reservoir, and an area downriver of it. Our aim was to test the hypothesis that the digestive organs of species with varied feeding habits have different enzymatic activities, and that the enzymatic activity differs among seasons and environmental conditions. The iliophagous/herbivorous species Hypostomus auroguttatus Kner, 1854 had higher trypsin-like, chymotrypsin-like peptidase and β-glucosidase activity in the intestine when compared with the omnivorous species Pimelodus maculatus Lacepède, 1803, whereas the latter had more hepatic trypsin-like activity than the former. The peak of activity of the three enzymes in H. auroguttatus was recorded in the winter and spring. On the other hand, P. maculatus tended to have the more prominent peptidase and β-glucosidase activity in the summer, and the smallest in the winter. The intestine of H. auroguttatus had higher enzymatic (trypsin, chymotrypsin and β-glucosidase activity than the stomach and the liver. For P. maculatus, the highest β-glucosidase activity was found in the liver. The enzymatic activity of H. aurogutattus did not differ between lotic and lentic systems, whereas P. maculatus had comparatively higher stomach and hepatic trypsin levels and hepatic chymotrypsin-like activities in the reservoir than down in the river. These findings indicate that, in H. auroguttatus, most digestive activity occurs in the intestine, which is long and adapted for the digestion of bottom-river vegetable matter and detritus. The seasons and the type of the system (lentic vs. lotic seem to affect the enzymatic activity for these two species differently, a likely consequence of their different lifestyles.

  6. Biología alimentaria y reproductiva de Farlowella vittata (Siluriformes: Loricariidae en la cuenca del río Güejar, Orinoquía, Colombia

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    Carlos A. García-Alzate

    2012-12-01

    Full Text Available Los peces de quebradas neotropicales conviven con una considerable variación espacial y temporal de sus alimentos. La disponibilidad de estos alimentos depende de diferentes factores tales como la morfología de los canales, la descarga, atributos físico-químicos y las interacciones con otras especies. Es así como estudios de los hábitos alimenticios contribuyen a la comprensión de las interacciones tróficas de las poblaciones de peces. En el presente trabajo se describen y evalúan los aspectos de la dieta y la reproducción de Farlowella vittata (Siluriformes: Loricariidae en el Arroyo Pringamosal, cuenca del río Güejar, cuenca del río Orinoco, Colombia. Se realizaron cinco expediciones de recolecta durante las temporadas de altas y bajas lluvias. Variables físicas y químicas del agua fueron medidas y los peces fueron capturados en varios puntos a lo largo de toda la cuenca. El arroyo Pringamosal es una corriente de primer orden con 3.5m de ancho y una profundidad media de 1m en el área de estudio. Valores de oxígeno disuelto son de 6.2mg/L durante bajas lluvias y 2.7mg/L durante altas lluvias, es oligotrófico con tendencia a la eutrofización. Ciento treinta ejemplares fueron analizados, 7 intervalos de tallas fueron recolectadas entre los 86.0 y 175.5mm de longitud estándar. La dieta de esta especie consiste principalmente de algas (Bacillariophyceae (84.6% AR, pero se observó una variación en la dieta de acuerdo a la temporada; en bajas lluvias se alimenta de fitoplancton (86.47% A.R. y en altas lluvias de zooplankton y material de origen vegetal y orgánico (0.685% A.R y 18.83% A.R. respectivamente, el ANDEVA de KruskalWallis mostró diferencias estadísticamente significativas de los ítems alimenticios entre sexos. El factor de condición (K indicó que la especie se encontró bien alimentada. El índice gonadosomático (RGS mostró que este pez se reproduce en aguas altas (abril-mayo. La fecundidad fue 1 819 ovocitos

  7. Biología alimentaria y reproductiva de Farlowella vittata (Siluriformes: Loricariidae en la cuenca del río Güejar, Orinoquía, Colombia Food and reproductive biology of Farlowella vittata (Siluriformes: Loricariidae in Güejar River Basin, Orinoco, Colombia

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    Carlos A. García-Alzate

    2012-12-01

    Full Text Available Los peces de quebradas neotropicales conviven con una considerable variación espacial y temporal de sus alimentos. La disponibilidad de estos alimentos depende de diferentes factores tales como la morfología de los canales, la descarga, atributos físico-químicos y las interacciones con otras especies. Es así como estudios de los hábitos alimenticios contribuyen a la comprensión de las interacciones tróficas de las poblaciones de peces. En el presente trabajo se describen y evalúan los aspectos de la dieta y la reproducción de Farlowella vittata (Siluriformes: Loricariidae en el Arroyo Pringamosal, cuenca del río Güejar, cuenca del río Orinoco, Colombia. Se realizaron cinco expediciones de recolecta durante las temporadas de altas y bajas lluvias. Variables físicas y químicas del agua fueron medidas y los peces fueron capturados en varios puntos a lo largo de toda la cuenca. El arroyo Pringamosal es una corriente de primer orden con 3.5m de ancho y una profundidad media de 1m en el área de estudio. Valores de oxígeno disuelto son de 6.2mg/L durante bajas lluvias y 2.7mg/L durante altas lluvias, es oligotrófico con tendencia a la eutrofización. Ciento treinta ejemplares fueron analizados, 7 intervalos de tallas fueron recolectadas entre los 86.0 y 175.5mm de longitud estándar. La dieta de esta especie consiste principalmente de algas (Bacillariophyceae (84.6% AR, pero se observó una variación en la dieta de acuerdo a la temporada; en bajas lluvias se alimenta de fitoplancton (86.47% A.R. y en altas lluvias de zooplankton y material de origen vegetal y orgánico (0.685% A.R y 18.83% A.R. respectivamente, el ANDEVA de KruskalWallis mostró diferencias estadísticamente significativas de los ítems alimenticios entre sexos. El factor de condición (K indicó que la especie se encontró bien alimentada. El índice gonadosomático (RGS mostró que este pez se reproduce en aguas altas (abril-mayo. La fecundidad fue 1 819 ovocitos

  8. Cytogenetic characterization of Hypostomus nigromaculatus (Siluriformes: Loricariidae

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    Marceléia Rubert

    Full Text Available Hypostomus is the most speciose genus in the family Loricariidae, with approximately 120 species. These fish show a wide morphological and color variation, which hinders the identification of species, mainly of widely distributed representatives. The aim of this study was to contribute to the current knowledge on cytogenetic features of Hypostomus nigromaculatus. Three specimens of H. nigromaculatus, collected in two tributaries of rio Tibagi, Paraná, and in Cachoeira de Emas, rio Mogi-Guaçu, São Paulo, the latter being the type locality of H. nigromaculatus, were studied. Chromosomal preparations were submitted to Giemsa staining, silver nitrate impregnation, C-banding and CMA3 and DAPI fluorochromes staining. All samples presented 2n = 76, but the rio Mogi-Guaçu sample differed from those from tributaries of rio Tibagi in relation to karyotype formulae, distribution and composition of heterochromatin, and NOR location. The silver nitrate staining revealed the presence of multiple Ag-NORs for all samples, but with differences on the location on chromosomes. CMA3 staining reveled bright signals equivalent to NOR-bearing chromosomal segments; such sites were characterized by negative, i.e. unstained, marks after DAPI staining. The pattern of heterochromatin distribution was distinctive among samples from rio Mogi-Guaçu and tributaries of rio Tibagi. The differences observed between the sample from rio Mogi-Guaçu and the ones from tributaries of rio Tibagi allow us to suggest that these samples are presently isolated. Further analyses are necessary to ascertain whether such isolation refers to distinct populations or characterizes true different species.

  9. The renal effects and initial characterization of venom from Philodryas nattereri Steindachner, 1870

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    Marinetes Dantas de Aquino Nery

    2014-01-01

    Full Text Available The venom of the snake Philodryas nattereri is a mixture of proteins and toxic peptides with several important local and systemic actions, which are similar to those occurring in Bothrops snake bites. The mechanisms involved in the local and systemic actions of this venom are unknown. The aims of the work were to initial characterization of P. nattereri venom and investigate the effects of the poison in the renal perfusion system and in cultured renal tubular cells of the type MDCK (Madin–Darby canine kidney. The P. nattereri venom is composed majority of proteins (86.3% and this poison promoted changes in all the evaluated renal parameters, mainly decreasing renal perfusion pressure (PP and renal vascular resistance (RVR and increasing urine flow (UF and glomerular filtration rate (GFR. The most relevant result was that this venom was highly detrimental to the renal tubules independent of the PP reduction, which was shown by a decrease in sodium (Na+, potassium (K+ and chloride (Cl− electrolyte transport in the studied concentrations. The glomeruli and tubules contain protein bodies and blood extravasation, which were observed by histological analysis. The venom of P. nattereri reduced viability of the MDCK cells only at high concentrations (50 and 100 μg/mL with an IC50 of 169.5 μg/mL.

  10. Broodstock management of the fine flounder Paralichthys adspersus (Steindachner, 1867 using recirculating aquaculture systems

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    Lili Carrera

    2013-03-01

    Full Text Available The present study describes the methodology used at IMARPE for the capture, acclimation and management of P. adspersus broodstock using recirculating aquaculture systems (RAS. RAS improved the water quality and maintained the environmental parameters during the acclimation period, temperature (17.2±1°C, oxygen (8.1±0.7 mg L-1, pH (7.3±0.2, ammonia (0.004±0.003 mg L-1, nitrite (0.52±0.2 mg L-1 and nitrate (3.45±2.6 mg L-1. Fish began to be fed normally from day 15 post-capture, once or twice a day using live fish (Odonthestes regia regia, Mugil cephalus, crustacean (Emerita analoga, fresh food (Engraulis ringens and Dosidicus gigas and artificial feed. A significant loss in the weight of the fish was registered during the first days of captivity, followed by a continuous increase in both sexes. The specific growth rate was positive from the third month of captivity, being the relative growth rate 24.5% and 16.2% in August 2010 in males and females, respectively. Different internal and external parasites were detected in the fish, being Entobdella sp. and Philometra sp. the prevailing parasites observed during samplings.

  11. Ecophysiological behavior of Caquetaia kraussii (Steindachner, 1878 (Pisces: Cichlidae exposed to different temperatures and salinities

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    M.I. Segnini de Bravo

    2001-03-01

    Full Text Available Tropical river sardine, Caquetaia kraussii, captured from La Aguá lagoon (Sucre State, Venezuela were acclimatized for four weeks at 22, 24, 30 and 32ºC and at 0, 5, 10, 15 and 17 ‰ salinity. To evaluate effects of thermal response to acclimatization level, the fish were transferred suddenly from lower temperatures (22 and 24ºC to higher ones (32 and 30ºC respectively. Then thermal resistance time was measured at the lethal temperature of 40.9ºC for 30 days. We considered that acclimatization process completed when resistance time was stabilized at the new temperature regime. For the saline effect, the concentrations of sodium and potassium were measured in the tissues at each treatment: gills, white muscle, gut and heart. The results showed that thermal tolerance increased rapidly in 3 h with a 6ºC rise in temperature (from 24 to 30ºC and in 24 h with a 10ºC rise (22 to 32ºC. With decreasing temperatures, the acclimatization level reached its lowest in 11 days with a 6ºC decreases (from 30 to 24ºC and in 14 days with a 10ºC decrease (32 to 22ºC. Caquetaia kraussii regulates as much sodium as potassium in gills and white muscle tissues at all salinity levels tested; however, gut and heart tissues showed significantly different regulations among salinities examined.La sardina tropical de río, Caquetaia kraussii, capturada en la laguna La Aguá (Estado Sucre, Venezuela fue aclimatada durante cuatro semanas a la temperatura de 22, 24, 30 y 32ºC y a 0, 5, 10, 15 y 17 ‰ de salinidad. Para evaluar los efectos de respuestas térmicas a los niveles de aclimatación, los peces fueron transferidos abruptamente desde las temperaturas bajas (22 y 24ºC hasta las altas (32 y 30ºC respectivamente. Se midió entonces la resistencia térmica a la temperatura letal de 40.9ºC durante 30 días. Se consideró que los peces habían alcanzado completamente su aclimatación cuando se estabilizaba al nuevo régimen de temperatura. Para el efecto salino, las concentraciones de sodio y potasio fueron determinadas en los tejidos: branquial, muscular, gástrico y cardíaco. Los resultados mostraron que la tolerancia térmica aumentaba rápidamente en 3 h cuando la diferencia de temperatura era de 6ºC (24 a 30ºC y en 24 h cuando la diferencia era de 10ºC (22 a 32ºC. En los descensos de temperaturas, el nivel de aclimatación se alcanzó a los 11 días cuando el intercambio se hizo desde 30 a 24ºC y en 14 días con un descenso de 10ºC (32 a 22ºC. Los resultados indican que Caquetaia kraussii regula tanto sodio como potasio a nivel muscular y branquial a todos los niveles de salinidad estudiados; sin embargo a nivel gástrico y cardíaco se observaron regulaciones significativamente diferentes entre las salinidades examinadas.

  12. Parasites of the flatfish Paralichthys adspersus (Steindachner, 1867 (Pleuronectiformes from northern Chile

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    Marcelo E Oliva

    1996-06-01

    Full Text Available Three species of protistan and 22 species of metazoan parasites were obtained from a sample of 179 flatfish, (Paralichthys adspersus taken-off Antofagasta, northern Chile. Prevalence of infection of seven parasites (Protista: 1, Copepoda: 2, Digenea: 1, Acantocephala: 1, Nematoda: 2 was significantly and positively correlated with host size. Host's sex do not seem to affect prevalence of infection, except for Nybelinia surmenicola, Capillaria sp. and Anisakis sp. (prevalence of infection significantly greater in males than females and Philometra sp. (prevalence higher in females. Mean abundance is correlated with size in nine species (Protista: 1, Copepoda: 2, Digenea: 3, Acantocephala: 1, Nematoda: 2. Host's sex do not affect mean abundance, except for Cainocreadium sp. and Philometra sp.(mean abundance higher in females and Nybelinia surmenicola, Capillaria sp. and Anisakis sp. (mean abundance higher in males.

  13. Morphological development of Anchoviella vaillanti (Steindachner, 1908 (Clupeiformes: Engraulidae larvae and early juveniles

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    Anailza Cristina G. da Silva

    Full Text Available The considerable similarity in the early life stages of different fish species makes egg and larvae identification in fishery biology and ichthyoplankton surveys a difficult task. Knowledge on early larval development of morphologically similar taxa and species-rich orders, such as Clupeiformes, mainly in the Neotropical fresh waters is rather limited. The aim of the present study was to describe morphological and meristic aspects of the larvae and early juveniles of Anchoviella vaillanti, an endemic species of the São Francisco River basin in Brazil. The characterization was based on an ontogenetic series of 132 individuals (1.3-51.0 mm SL. In the larval period, body varies from elongated to very elongated and the head is small, which is typical of Clupeiformes. The finfold is present beginning in the yolk-sac stage, when larvae have a large yolk sac, until the flexion stage. Pectoral fin buds are the first to form during the preflexion stage, when dorsal- and anal-fin pterygiophores and hypural bones are first visible. The total vertebra count ranges from 36 to 39 and the myomere number ranges from 31 to 45. Complete fin formation obeys the following sequence: anal and dorsal fins during flexion stage; and pectoral, pelvic and caudal fins during postflexion stage. Despite being the only freshwater clupeiform representative in the São Francisco River, A. vaillanti may occur sympatrically with A. lepidentostole in the lower stretches of the river basin. Although early larvae characteristics of A. lepidentostole are not known, its late larvae and early juveniles may be distinguished from those of A. vaillanti, by the higher number of dorsal-fin rays (15 or 16 vs. 12 or 13 in A. vaillanti, higher total vertebra count (40 vs. 37 to 40 and shorter pre-pectoral length (14 to 16 vs. 22.8 to 28.9% SL.

  14. Threatened Fishes of the World: Telestes Croaticus (Steindachner, 1866 (Cypriniformes: Cyprinidae

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    Jelić Dušan

    2017-03-01

    Full Text Available Telestes croaticus is a freshwater fish endemic in Croatia. It is a stygophile species, living above ground but occasionally retreating into subterranean waters. This species is found in the southwest region of Croatia, in the Lika-Jadova and Ričica drainages, in cold and clear waters in lowland habitats with little current, and in springs and associated wetlands. It is protected under Croatian law and was listed by the IUCN Red List as Endangered (EN. It has an extremely limited distribution which makes it vulnerable to different kind of traits such as habitat destruction, water extraction, dam construction, agricultural water pollution and especially the introduction of non-indigenous fish species. Suggested conservation actions for this species are: bans on watercourse regulation, reduction of pollution and eradication of alien fish species. Due to its fast decline in the last 10 years, it is our proposition that T. croaticus should be upgraded to a Critically Endangered species under criterion A2ace A4ace.

  15. Crescimento do niquim (Lophiosilurus alexandri Steindachner 1876, em diferentes condições de luminosidade e tipos de alimento = Niquim (Lophiosilurus alexandri Steindachner 1876 growth, in different luminosity conditions and types of food

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    Ruy Albuquerque Tenório

    2006-10-01

    Full Text Available O niquim Lophiosilurus alexandri é um peixe endêmico do rio São Francisco e foi prejudicado após o represamento das águas, sendo uns dos peixes mais valorizados na região do Submédio e apresentando potencial para a piscicultura. O trabalho teve por objetivo avaliaro seu crescimento durante as fases ontogênicas iniciais, em diferentes condições de luminosidade e tipos de alimento, fornecendo subsídios técnicos à piscicultura e aos programas de propagação da espécie. O experimento foi realizado em incubadoras com luminosidades de 100% (L, 50% (ML e 0% (SL com quatro repetições e dois critériosalimentares: plâncton+ração e Dendrocephalus brasiliensis+ração. A Análise de Variância (Anova foi realizada para verificar o efeito de diferentes condições de luz e de alimento sobre o comprimento dos niquins. O teste de Tukey (PNiquim Lophiosilurus alexandri is an endemic fish from the San Francisco River and was harmed after the damming up of the waters, being one of the most valuable fish in the Sub-medium region and presenting potential for pisciculture. This study aimed to evaluate its growth during the initial ontogenic phases, under different luminosity conditions and types of food, supplying technical subsidies to the pisciculture and to the species propagation programs. The experiment was conducted in incubators with luminosity at 100% (L, 50% (ML and 0% (SL with four repetitions and two alimentary criteria: plankton+ration and Dendrocephalus braziliensis+ration. The variance analysis (ANOVA was carried out to verify the effect of different light conditions and food on the Niquins' length. The Tukey test (P<0.05 was used to verify the differences between the treatment's averages. There was a significantdifference for the light treatment (ANOVA LUZ: P=0.0030 and the Tukey test indicated the smaller average measurement for the L treatment. The greatest average of the last biometric taken was 74.70±5.95 mm much superior to 25 mm taken for the one that didnot obey the luminosity criterion. The conclusions pointed that by using carnivore's ration, the growth of Niquim was influenced only by luminosity.

  16. Aspectos biometricos del bagre Arius Furthii Steindachner (Pisces Ariidae, colectado en punta Morales, Golfo de Nicoya, Costa Rica

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    Maurizio Protti Quesada

    2016-03-01

    Full Text Available Se analizan estadísticamente algunos parámetros biométricos de 257 ejemplares de Arius furthii (Ariidae, colectados en una zona de playa y otra de manglar en Punta Morales, Puntarenas, Costa Rica. Las colectas se realizaron por medio de “arrastres” con una red tipo “chinchorro”. La talla de los especímenes capturados osciló entre 55 y 276 mm de longitud total y 1,3 a 176 g en peso fresco. El análisis estadístico mostró que la longitud total es la mejor variable para la estimación del peso fresco a través de una ecuación de regresión logarítmica.  Además, se mostró que no existen diferencias significativas en el peso de los Arius furthii colectados en la playa y los colectados en el manglar.

  17. ACUICULTURA DE PARGO LA MANCHA LUTJANUS GUTTATUS (STEINDACHNER, 1869 EN COSTA RICA DENTRO DE UN ENFOQUE ECOSISTÉMICO

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    Angel Herrera-Ulloa

    2011-07-01

    Full Text Available La sobreexplotación pesquera y la búsqueda de alternativas ante la pobreza crónica han llevado a explorar el campo de la maricultura por medio de un enfoque ecosistémico se abrieron dos procesos paralelos: una estrategia e; investigación en laboratorio para el levantamiento larval de peces marinos tropicales y una estrategia de comanejo para desarrollar el cultivo de peces marinos tropicales. El pargo la mancha muestra gran potencial de producción de larvas y posterior cultivo en el mar. No mostró respuestas positivas a la inducción por medio de hormonas, el desarrollo de un ambiente adecuado para su reproducción espontánea, permitió tener desoves frecuentes y de calidad. La fase de levantamiento larval mostró contratiempos por el tamaño reducido de las larvas de pargo la mancha el manejo en tanques apropiados y el uso de enriquecedores permitieran mejorar los procesos y llegar a incrementar la producción de alevines. El enfoque ecosistémico permitió abrir los espacios necesarios que permitieron la operación de un proyecto piloto. La granja se creó con un enfoque productivo, pero también para turismo rural. Overfishing and the search for alternatives to it, led us to the explore mariculture as an option using an ecosystem-based approach through two parallel processes: an in-laboratory research strategy for larval rearing of tropical marine fish, and a strategy of co-management to develop tropical marine fish aquaculture. The spotted rose snapper shows great potential for larvae production and cage culture. This species showed no responses to hormone induction; however, the set up of a suitable environment allowed frequent, high-quality spontaneous spawnings. The larval rearing phase presented problems due to the small size of the larvae; although, management in appropriate tanks and the use of enrichments improved the processes, increasing the production of juveniles. This ecosystem approach allowed the operation of a profitable farm pilot project with a productive approach, but with rural tourism in mind as well.

  18. Morphological characteristics of the digestive tract of Schizodon knerii (Steindachner, 1875, (Characiformes: Anostomidae: An anatomical, histological and histochemical study

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    Marcella L. Dos Santos

    2015-06-01

    Full Text Available The digestive tracts of 44 specimens of Schizodon knerii were studied using anatomical, histological and histochemical techniques. The mouth has terminal position, the lip epithelium is squamous stratified with mucous, claviform cells and taste buds, teeth have an incisive form and the tongue has a stratified squamous epithelium with mucous cells and taste buds. The oropharynx cavity is formed by gill apparatus and pharyngeal teeth. The oesophagus presented pleated mucosa, a stratified squamous epithelium with mucous cells, oesophageal glands and taste buds. The stomach presented cardiac, fundic and pyloric regions, simple prismatic epithelium with tubular glands, with none in the pyloric region. The intestine contains 11-15 pyloric caeca, a simple prismatic epithelium with brush border, goblet cells and lymphocytes. Mucosal cells, oesophageal glands and goblet cells reacted positively to PAS, amylase + PAS, Ab pH 2.5 and Ab pH 0.5. Gastric prismatic cells reacted positively to PAS, amylase + PAS, but only those in the pyloric region reacted positively to Ab pH 2.5 and Ab pH 0.5. The results improve the understanding of the anatomy of S. knerii feeding habits and the presence of mucosubstances in the epithelium, highlights the importance of glycoproteins for passing food through the digestive tract.

  19. Cytogenetic analysis of five Hypostomus species (Siluriformes, Loricariidae)

    Science.gov (United States)

    Martinez, Emanuel Ricardo Monteiro; Zawadzki, Claudio Henrique; Foresti, Fausto; Oliveira, Claudio

    2011-01-01

    In this work, we analyzed the karyotypes of five Hypostomus species. Hypostomus cf. heraldoi, from the Mogi-Guaçu River, had 2n = 72 chromosomes, with a nucleolar organizer region (NOR) in one chromosomal pair. Hypostomus regani, from the Mogi-Guaçu River had 2n = 72 chromosomes with NORs in two chromosomal pairs. Hypostomus sp., from the Mogi-Guaçu River basin, had 2n = 68 chromosomes, with NORs in two chromosomal pairs. Hypostomus aff. agna, from Cavalo Stream, had 2n = 74 chromosomes with NORs in two chromosomal pairs. Hypostomus cf. topavae, from Carrapato Stream, had 2n = 80 chromosomes, with NORs in two chromosomal pairs. Hypostomus species showed marked diversity in the karyotypic formula, which suggested the occurrence of several Robertsonian rearrangements and pericentric inversions during the evolutionary history of this genus. This hypothesis was supported by the occurrence of a large number of uniarmed chromosomes and multiple NORs in a terminal position in most species and may be a derived condition in the Loricariidae. PMID:22215958

  20. Anatomia da cavidade bucofaringeana de Sorubim trigonocephalus (Siluriformes, Osteichthyes

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    Cristiano de Oliveira Schuingues

    2013-10-01

    Full Text Available Sorubim trigonocephalus Miranda et Ribeiro, 1920 conhecido popularmente como chinelo, é uma espécie migratória, de importância econômica. Bastante apreciado na gastronomia por apresentar sabor agradável e sem ossos intermusculares (espinhos. Os exemplares foram coletados em um trecho no Rio Teles Pires, localizado no município de Alta Floresta/MT. Anestesiados e sacrificados em solução aquosa de benzocaína, fixados com solução de formoldeído a 10%, transferidos para o Laboratório de Anatomia Animal/Unemat para descrição das características da cavidade bucofaringeana. Esta espécie apresentou uma pré-maxila bem desenvolvida e cabeça achatada dorsoventralmente, boca localizada na porção ventral média da cabeça, com fenda bucal ampla. Os lábios superiores apresentaram pigmentação cinza escuro com pequenas áreas claras, sendo mais largos que os inferiores e não apresentaram pigmentação. Foram identificadas quatro regiões dentígeras na porção anterior da cavidade bucal e duas na região da faringe, todas com dentes viliformes. A porção posterior da cavidade bucal era limitada lateralmente por quatro pares de arcos branquiais que decresciam em tamanho do primeiro ao último par, crânio-caudal, formados por dois ramos: o superior, mais curto, e o inferior, mais longo. A cavidade bucofaringeana de S. trigonocephalus se mostrou semelhante à de outros teleósteos descritos na literatura, estando adaptado ao hábito alimentar com dieta carnívoro-ictiofágica e diferindo apenas pela ausência de língua estrutural com pré maxila bem desenvolvida apresentando dentes viliformes.

  1. A systematic revision of Tatia (Siluriformes: Auchenipteridae: Centromochlinae

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    Luisa Maria Sarmento-Soares

    Full Text Available The auchenipterid catfish genus Tatia is revised. Twelve species are recognized including three described as new. Tatia is diagnosed by the hyomandibula elongated anterodorsally, the anal-fin base of adult males reduced in length, and the caudal peduncle laterally compressed and deep with a middorsal keel. Tatia aulopygia occurs in the Madeira river drainage and is distinguished by the reduced cranial fontanel in adults and male modified anal fin with middle rays reduced in length. Tatia boemia, known from the upper Uruguay river drainage, is distinguished by its unique color pattern with dark chromatophores on the sides of body. Tatia brunnea from river basins in Suriname and French Guiana and the Negro river drainage, Amazon basin, is recognized by its wide head and mouth and by the male modified anal fin with sharply pointed tip. Tatia dunni, from the upper Amazon basin, is recognized by its narrow head, long postcleithral process in some specimens, and body coloration with irregular blotches or stripes. Tatia galaxias, endemic to the Orinoco river basin, is distinguished by its large eye and short snout. Tatia gyrina, distributed in the upper and central Amazon basin and in northern Suriname, has a uniquely reduced mesethmoid, slightly protruding lower jaw, second nuchal plate with slightly concave lateral borders, third nuchal plate reduced, small prevomer, low number of ribs, low number of vertebrae and sexual dimorphism regarding intumescent male genital papilla. Tatia intermedia, recorded from central and lower Amazon basin, Tocantins river, and coastal drainages in Guyana, Suriname, French Guiana, and eastern Pará State, Brazil, is distinguished by the short postcleithral process, small eye and long snout. Tatia neivai, from the upper Paraná river , Paraguay river and upper Paraíba do Sul river basin, is distinguished by its unique vertebral count and caudal-fin coloration consisting of transverse dark bars. Tatia strigata, from central Amazon basin and Negro river, is distinguished by its horizontally striped color pattern and the modified male anal fin with middle rays reduced in length. Tatia caxiuanensis, a new species described from the Curuá river, lower Amazon basin, is recognized by its wide cranial fontanel and distinctive anal fin in mature males. Tatia meesi, a new species described from the Essequibo river basin, Guyana, is distinguished from congeners by the cranial fontanel with two separate openings and thin nasal bone. Tatia nigra, a new species described from the central Amazon basin, is distinguished by its short postcleithral process, low number of vertebrae, and dark color pattern. All twelve species of Tatia are described or redescribed and a key to species is provided.

  2. Karyotype and nuclear DNA content of Trichomycterus areolatus (Siluriformes, Trichomycteridae

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    Nelson Colihueque

    2006-01-01

    Full Text Available Cytogenetic analysis of Trichomycterus areolatus, collected from the Tijeral and Huilma Rivers in southern Chile has shown a diploid chromosome number of 2n = 54, a fundamental number of FN = 106, and a karyotypic formula of 44m + 8sm + 2st. Intra-individual polymorphism of chromosome number (2n = 54, 55 and 56 in specimens from the Huilma River has also been documented, providing further evidence of the occurrence of this phenomenon in Trichomycterus. The karyotype exhibited large chromosome pairs: metacentric pairs 1 (relative length 7.54%, 2 (5.75% and 3 (5.09%, submetacentric pair 23 (5.25%, and subtelocentic pair 27 (5.28%. Nuclear DNA content analysis showed an average value of 5.04 ± 1.09 pg/nucleus. This DNA content is higher than the mean value described for other species in this genus.

  3. Cytogenetic analysis of five Hypostomus species (Siluriformes, Loricariidae

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    Emanuel Ricardo Monteiro Martinez

    2011-01-01

    Full Text Available In this work, we analyzed the karyotypes of five species. Hypostomus cf. heraldoi, from the Mogi-Guaçu River, had 2n = 72 chromosomes, with a nucleolar organizer region (NOR in one chromosomal pair. Hypostomus regani, from the Mogi-Guaçu River had 2n = 72 chromosomes with NORs in two chromosomal pairs. Hypostomus sp., from the Mogi-Guaçu River basin, had 2n = 68 chromosomes, with NORs in two chromosomal pairs. Hypostomus aff. agna, from Cavalo Stream, had 2n = 74 chromosomes with NORs in two chromosomal pairs. Hypostomus cf. topavae, from Carrapato Stream, had 2n = 80 chromosomes, with NORs in two chromosomal pairs. Hypostomus species showed marked diversity in the karyotypic formula, which suggested the occurrence of several Robertsonian rearrangements and pericentric inversions during the evolutionary history of this genus. This hypothesis was supported by the occurrence of a large number of uniarmed chromosomes and multiple NORs in a terminal position in most species and may be a derived condition in the Loricariidae.

  4. Phylogenetic relationships of the South American Doradoidea (Ostariophysi: Siluriformes

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    José L. O. Birindelli

    Full Text Available A phylogenetic analysis based on 311 morphological characters is presented for most species of the Doradidae, all genera of the Auchenipteridae, and representatives of 16 other catfish families. The hypothesis that was derived from the six most parsimonious trees support the monophyly of the South American Doradoidea (Doradidae plus Auchenipteridae, as well as the monophyly of the clade Doradoidea plus the African Mochokidae. In addition, the clade with Sisoroidea plus Aspredinidae was considered sister to Doradoidea plus Mochokidae. Within the Auchenipteridae, the results support the monophyly of the Centromochlinae and Auchenipterinae. The latter is composed of Tocantinsia, and four monophyletic units, two small with Asterophysusand Liosomadoras, and Pseudotatiaand Pseudauchenipterus, respectively, and two large ones with the remaining genera. Within the Doradidae, parsimony analysis recovered Wertheimeriaas sister to Kalyptodoras, composing a clade sister to all remaining doradids, which include Franciscodorasand two monophyletic groups: Astrodoradinae (plus Acanthodorasand Agamyxis and Doradinae (new arrangement. Wertheimerinae, new subfamily, is described for Kalyptodoras and Wertheimeria. Doradinae is corroborated as monophyletic and composed of four groups, one including Centrochirand Platydoras, the other with the large-size species of doradids (except Oxydoras, another with Orinocodoras, Rhinodoras, and Rhynchodoras, and another with Oxydorasplus all the fimbriate-barbel doradids. Based on the results, the species of Opsodoras are included in Hemidoras; and Tenellus, new genus, is described to include Nemadoras trimaculatus, N. leporhinusand Nemadoras ternetzi. Due to conflicting hypotheses of the phylogenetic position of Acanthodoras, Agamyxis, and Franciscodoras, these are considered as incertae sedisin Doradidae. All suprageneric taxa of the Doradoidea are diagnosed based on synapomorphic morphological characteristics.

  5. The species of Hemiancistrus (Siluriformes: Loricariidae) from Ecuador.

    Science.gov (United States)

    Provenzano R, Francisco; Barriga S, Ramiro

    2017-05-29

    At the Fish Collection of the Instituto de Ciencias Biológicas, Escuela Politécnica Nacional, Quito, three species traditionally grouped in the genus Hemiancistrus were identified: H. annectens (Regan 1904), H. landoni Eigenmann 1916, and a new specie described here. The new species inhabits exclusively in the Esmeraldas River Basin, Pacific slope, northwestern Ecuador. It is easily recognized by the completely naked abdomen, with rounded, dark spots, and a different color pattern on the dorsal and caudal fins. A comparative analysis of bones related to the opercular mobility, shows important differences between H. annectens, H. landoni, and the new species, suggesting that H. annectens does not belong to the genus Hemiancistrus or the Ancistrini group. According to the characteristics observed in these bones, H. annectens shows greater similarity to those reported in species of the Hypostomini group, supporting its inclusion in this group, but placing it in the genus Hypostomus requires further analysis. On the other hand, the conditions observed on the bones of Hemiancistrus landoni and the new species suggest that both are inside of the Ancistrini group. The new species is placed in the genus Hemiancistrus tentatively, pending future analysis.

  6. Mitochondrial transcripts and associated heteroplasmies of Ancistrus spp. (Siluriformes: Loricariidae

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    Daniel A. Moreira

    2015-12-01

    Full Text Available This data-set complements our paper entitled “The use of transcriptomic next-generation sequencing data to assembly mitochondrial genomes of Ancistrus spp. (Loricariidae” [6]. Here, we present the nucleotide sequences of each transcript used for mitogenomes assembly, as well as tables presenting the location of each transcript in the mitogenomes; the frequency, location and codon position of the detected heteroplasmic sites; and the start/stop codons usage, UTR, CDS and poliA-tail length for each protein coding gene. Readers are referred to the paper cited above for data interpretation and discussion.

  7. Triploidy in the hematology of jundia juveniles (Siluriformes: Heptapteridae)

    OpenAIRE

    Fukushima, H; Bailone, RL; Weiss, LA; Martins, ML; Zaniboni-Filho, E

    2012-01-01

    This study compared the hematological characteristics of diploid and triploid of jundia, Rhamdia quelen juveniles, an important freshwater fish cultured in south Brazil. Hematological morphometry of erythrocytes were determined in blood smears under a light microscope. The blood was used to measure the number of red blood cells (RBC) with a hemocytometer Neubauer chamber, and the numbers of white blood cells (WBC) and thrombocytes that were obtained using an indirect method. The results showe...

  8. Reproductive indicators of Parauchenipterus striatulus (Steindachner) (Pisces, Auchenipteridae) in the Ribeirão das Lajes reservoir, Rio de Janeiro, Brasil

    OpenAIRE

    Araújo, Francisco Gerson; Duarte, Silvana; Goldberg, Rubens Sterental; Fichberg, Liana

    1999-01-01

    Parauchenipterus striatulus is a representative of the freshwater catfish with wide distribution in the South America region. Despite of being a very abundant fish in rivers and reservoirs of this region, little is known about its biology and ecology. In Ribeirão das Lajes reservoir (22º42'S - 22º50'S, 43º53'- 44º05' W, Rio de Janeiro), the Rio de Janeiro state's largest hydroelectric reservoir, this species is very abundant, representing about 40% of the total experimental fish catches using...

  9. Crecimiento en jaulas del pargo lunarejo Lutjanus guttatus (Steindachner, 1869 con dos tipos de dieta en Bahía Málaga, municipio de Buenaventura, Colombia

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    Edgardo Andrés Banguera Gil

    2010-01-01

    Full Text Available Para dar continuidad al “Programa de desarrollo de la maricultura en el Pacífico colombiano” adelantado por la Universidad del Pacífico, en un cerramiento natural ubicado en la vereda La Sierpe, Bahía Málaga, municipio de Buenaventura, se comparó la tasa de crecimiento de 204 ejemplares silvestres de pargo lunarejo Lutjanus guttatus , alimentados con pescado fresco y concentrado comercial al 35% en proteína, con peso y longitud total promedio de 13,79 cm y 32,21 g, respectivamente. El trabajo se realizó por espacio de 40 días en cuatro jaulas flotantes, de 3 x 1,5 x 0,75 m, dos para cada tratamiento, a densidades de 15 individuos/m 3 , utilizando el 12% de la biomasa corporal para el suministro de los alimentos a evaluar; el crecimiento se analizó mediante los siguientes índices: IPD = Incremento en Peso Diario; TCE = Tasa de Crecimiento Específico. Los peces alcanzaron un peso promedio final de 64,9±5,9 y 58,49±5,9 g para el alimento natural y balanceado comercial respectivamente, lo cual es equivalente a un IPD de 0.8 y 0.7 g/d y una TCE de 1,58 y 1,67 g/d, valores considerados buenos teniendo en cuenta su etapa de desarrollo y comparaciones con otros estudios realizados en Colombia. Los peces aceptaron los dos tipos de alimento de manera satisfactoria, durante el período de cultivo y mostraron gran tolerancia a la manipulación, resistencia a las enfermedades y a las fluctuaciones de la calidad del agua, en especial la salinidad. Los resultados señalan que existen diferencias significativas (P>0.05 entre los dos tratamientos a favor del alimento natural. Los índices de sobrevivencia fueron de 90,2% para peces alimentados con pescado fresco y 85,3% para los alimentados con concentrado. Se concluye que el pargo lunarejo Lutjanus guttatus presenta una importante ventaja para su cultivo como es la fácil aceptación de un concentrado comercial. pero el crecimiento de los peces alimentados con este producto fue significativamente menor que los peces alimentados con alimentos naturales y ambos presentaron valores relativamente en comparación con cultivos de pargo efectuados en otras latitudes por lo que se sugiere realizar cultivos empleando concentrados con mayores niveles de proteínas balanceados para la especie.

  10. RELACIÓN LONGITUD-PESO DEL RUBIO (Salminus affinis Steindachner, 1880 EN LA CUENCA DEL RÍO SINÚ, COLOMBIA

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    Charles Olaya-Nieto

    2008-08-01

    Full Text Available Objective. To estimate the length–weight relationship of rubio in the Sinu river basin, as a contribution to the management of their fishery. Materials and methods. Between January 2000 and August 2005, 122 individuals with sizes between 9.3 and 63.0 cm total length (TL and weight (WT ranged between 6.6 to 3966.0 g were collected. Resultados. The length–weight relationship was: TW = 0.005 (± 0.03 TL3.19 (± 0.02, positive allometric growth coefficient (b, and correlation coefficient of 0.99. The growth coefficient varied between 3.34 y 3.21 without statistically significant differences (p£0.05. The condition factor oscillated between 0.003 y 0.005, without statistically significant differences (p£0.05. We found a correlation among the condition factor, the level of the Sinu river, and spawning season of the rubio, which extends from March to September. Conclusions. Rubio have adapted to the new conditions of the Sinu river as determined by lack of significant differences in size and weight.

  11. Use of electromyogram telemetry to assess the behavior of the Iberian barbel (Luciobarbus bocagei Steindachner, 1864) in a pool-type fishway

    OpenAIRE

    Alexandre, C.M.; Quintella, B.R.; Silva, A.T.; Mateus, C.S.; Romão, F.; Branco, P.; Ferreira, M.T.; Almeida, P.R.

    2013-01-01

    Decline in fish species populations due to river regulation by dams and weirs promoted the development of fishways, which are becoming one of the most common measures for the restoration of connectivity in rivers. Fishways efficiency can be species specific and thus monitoring and evaluation, and subsequent adjustments to design and hydraulic features, are required to inform potential users prior to installation. In this study we tested the applicability of electromyogram telemetr...

  12. Maturidade do ovário no cascudo Hypostomus strigaticeps (Siluriformes, Loriicaridae = Ovarian organization and maturity stages of armored catfish Hypostomus strigaticeps (Siluriformes, Loriicaridae

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    Erico Luis Hoshiba Takahashi

    2008-01-01

    Full Text Available No presente trabalho, foi estudado o desenvolvimento ovariano do cascudo Hypostomus strigaticeps. Foram coletadas 332 fêmeas, em coletas mensais, de julho de 2002 até junho de 2004, no rio Corumbataí, Estado de São Paulo, bacia do Paraná. Os ovários foramprocessados com técnicas histológicas de rotina, com inclusão em parafina, corte com 5 μm de espessura e coloração em hematoxilina-eosina. Foram observados seis tipos de ovócitos: Cromatina-nucléolo, Perinucleolar, Alvéolo-cortical, Vitelogênico, Maduro e Atrésico. Foiconstruída uma escala de maturidade, a partir de observações microscópicas, macroscópicas e do índice gonadossomático com quatro fases: Repouso, Maturação, Maduro e Desovado. This work studied the ovarian development of the armored catfish Hypostomus strigaticeps. Between July 2002 and June 2005, 332 females were collected monthly from the Corumbataí River, São Paulo State –Brazil. The ovaries were processed using routine histological techniques – paraffin inclusion and 5 μm thick sections stained in hematoxylin-eosin. Six types of oocytes were observed: Chromatin-nucleolus, Perinucleolar, Cortical-alveolus, Vitellogenic, Ripe andAtresic. Four maturity stages were created based on macroscopic and microscopic morphological observations, as well as on analysis of the gonadossomatic index (GSI: Rest, Maturation, Ripe and Spawned.

  13. Indicadores reprodutivos de Parauchenipterus striatulus (Steindachner (Pisces, Auchenipteridae na Represa de Ribeirão das Lajes, Rio de Janeiro, Brasil Reproductive indicators of Parauchenipterus striatulus (Steindachner (Pisces, Auchenipteridae in the Ribeirão das Lajes reservoir, Rio de Janeiro, Brasil

    Directory of Open Access Journals (Sweden)

    Francisco Gerson Araújo

    1999-01-01

    Full Text Available Parauchenipterus striatulus is a representative of the freshwater catfish with wide distribution in the South America region. Despite of being a very abundant fish in rivers and reservoirs of this region, little is known about its biology and ecology. In Ribeirão das Lajes reservoir (22º42'S - 22º50'S, 43º53'- 44º05' W, Rio de Janeiro, the Rio de Janeiro state's largest hydroelectric reservoir, this species is very abundant, representing about 40% of the total experimental fish catches using gill nets. This paper aims to assess aspects of the reproductive cycle of this species describing the gonadal stages, gonadosomatic index, weight-length relationship and condition factor. Fish sampling were carried out bi-monthly, between April 1996 and May 1997. Gill nets used were 100 m long, 4 m high with mesh size between 25 and 65 mm. Macroscopic analysis of 339 individuais were performed for the determination of 5 maturation stages, for both sexes (immature, maturation I, maturation II, ripe, spawned (females and emptied (males. The gonadosomatic index for both sexes was higher from October to March, suggesting a long spawning period while the condition factor was higher from February to June, showing an inverse relationship between these two parameters. Weight-length relationship for males was W=0,0095L3,C862and for females W= 0,0116L3,126, and no significam differences were shown between sex with reference to the alometry coefficient.

  14. Diversidade das assembléias de peixes nas quatro unidades geográficas do rio Paraíba do Sul Diversity of fish assemblages in the four geographic units of the Paraíba do Sul river

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    Tatiana P. Teixeira

    2005-12-01

    Full Text Available Padrões na diversidade de peixes ao longo de quatro unidades geográficas (superior, médio-superior, médio-inferior e inferior no rio Paraíba do Sul foram estudados com a finalidade de avaliar tendências de variações espaciais (unidades geográficas e temporais (períodos de cheia e seca. Vinte e cinco locais foram amostrados entre Dezembro de 2002 e Março de 2003 (verão/cheia e, entre Agosto e Novembro de 2003 (inverno/seca. Os peixes foram capturados com um esforço padronizado, utilizando redes de espera, tarrafas e peneiras. Um total de 81 espécies foram registradas compreendendo 9 ordens, 29 famílias e 55 gêneros. Characiformes apresentaram maior número de espécies (28 seguido de Siluriformes (23. Perciformes, principalmente Tilapia rendalli e Geophagus brasiliensis, e Cyprinodontiformes com destaque para Poecilia vivipara e Poecilia reticulata, foram os grupos numericamente mais abundantes, enquanto Siluriformes, principalmente Hypostomus luetkeni, e Perciformes com Geophagus brasiliensis apresentaram maior contribuição em biomassa. Poecilia vivipara foi encontrada apenas no período de seca. Espacialmente, Hoplosternum littorale predominou no trecho médio-superior, Pimelodus fur, Hypostomus luetkeni, Glanidium albescens no trecho médio-inferior, e Loricariichtys spixii e Prochilodus lineatus no trecho inferior. O número de espécies e a riqueza de Margalef apresentaram um aumento do trecho superior para o inferior, principalmente durante o período de cheia. Espécies que apresentaram ampla distribuição ao longo do rio (G. brasiliensis, Oligosarcus hepsetus e P. reticulata são consideradas oportunistas por se aproveitarem dos recursos disponíveis em ambientes pobres, refletindo o estado de alterações do rio. Diferenciações na fisiografia ao longo da extensão longitudinal da bacia não coincidiram com mudanças nas assembléias de peixes, sugerindo que fatores associados a alterações de hábitats poderiam

  15. Chromosomal analyses in Megalonema platanum (Siluriformes: Pimelodidae, an endangered species from South American rivers

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    Rafael Augusto de Carvalho

    Full Text Available This study presents chromosomal data of Megalonema platanum from rio Tibagi, Paraná, Brazil and from rio Paraná, Argentina. The diploid number was equal 54 with karyotype composition of 24m+16sm+2st+12a in both populations. The AgNOR sites were detected in the terminal position of a submetacentric pair of the two analyzed populations, coinciding with secondary constrictions on the short arm of pair 15. CMA3 and FISH with 18S rDNA probe displayed fluorescent signals that correspond to the AgNOR sites and secondary constriction. The presence of a small acrocentric supernumerary chromosome can be observed in M. platanum from rio Tibagi, with centromeric heterochromatin. Others heterochromatic blocks were evidenced in the terminal position of some chromosome and one metacentric large chromosome pair, probably the first pair, showed an interstitial heterochromatin. In the population of the rio Paraná were still observed heterochromatic blocks in both ends in some chromosomes. This work brings for the first time cytogenetic date of M. platanum, which is a very rare species in the rio Paraná basin and may be endangered.

  16. TAPEWORMS (CESTODA: CARYOPHYLLIDEA), PARASITES OF CLARIAS BATRACHUS (PISCES: SILURIFORMES) IN THE INDOMALAYAN REGION

    Czech Academy of Sciences Publication Activity Database

    Ash, Anirban; Scholz, Tomáš; Oros, M.; Kar, P. K.

    2011-01-01

    Roč. 97, č. 3 (2011), s. 435-459 ISSN 0022-3395 R&D Projects: GA MŠk LC522; GA ČR GA524/08/0885; GA ČR GAP506/10/1994; GA ČR GD206/09/H026 Institutional research plan: CEZ:AV0Z60220518 Keywords : CESTOIDEA * PLATYHELMINTHES * EVOLUTION * INDIA Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 1.405, year: 2011

  17. Induced spawning of the endangered Neotropical species Steindachneridion parahybae (Siluriformes: Pimelodidae

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    Danilo Caneppele

    Full Text Available The "surubim do Paraíba" (Steindachneridion parahybae is a freshwater catfish endemic to the Paraíba do Sul River basin, Brazil. This species has been seriously threatened by environmental disturbances in the last several decades. Wild Steindachneridion parahybae males and females were collected in 2003 and taken to the hatchery of a power plant of the Companhia Energética de São Paulo (CESP. Steindachneridion parahybae broodstocks were artificially induced to reproduce in December 2003 using a combination of carp pituitary extract (CPE and human chorionic gonadotropin (hCG. Oocytes and milt were stripped; the fertilized eggs were transferred to 60-liter conical incubators and hatched larvae distributed in nine horizontal trays. Exogenous feed was started just after yolk sac absorption. A high rate of cannibalism and photophobia were observed during the larval period, resulting in a 26% survival rate from larvae to fingerlings.

  18. A New Species of Tiger Pleco Panaqolus (Siluriformes: Loricariidae from the Xingu Basin, Brazil.

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    Christian Andreas Cramer

    Full Text Available Panaqolus tankei is described from the Xingu River, Brazil. The new species is diagnosed from P. albomaculatus, P. dentex, P. nix, P. nocturnus, and P. koko by its color pattern consisting of dark and light diagonal bars on the body and bands on the fins (vs. body and fins without bars or bands; from P. albivermis, P. maccus, and P. purusiensis by the width of the dark bars being more or less the same of the light bars (vs. dark bars at least two or three times wider than light bars and from P. changae by the absence of vermiculation on the head (vs. vermiculation present on head. The new species differs from P. gnomus by the orientation of the bars from posterodorsal to anteroventral direction (vs. anterodorsal to posteroventral direction, and from P. claustellifer by the orientation of the bands in the dorsal fin that are not parallel to the margin (vs. parallel to the margin. The barcoding region (COI was sequenced for the new species, sequences were deposited in GenBank and were compared with congeners from other drainages. With regard to the current construction of a hydroelectric power plant (a so-called mega dam in the Xingu River, herewith we increase knowledge of the river Xingu's ichthyofauna and, thus improve the assessment of the impacts of that construction on the river.

  19. Pimelodus paranaensis, sp. n., um novo Pimelodidae (Pisces, Siluriformes do Alto Paraná, Brasil

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    Heraldo A. Britski

    1988-01-01

    Full Text Available Descreve-se Pimelodus paranaensis, sp. n., da bacia do Alto Paraná, Brasil, com base em 20 exemplares. A nova espécie pode ser assim diagnosticada: (i dentes presentes e formando duas áreas isoladas no vômer; (ii faixa pré-maxilar de dentes com um ângulo projetado para trás; (iii teto do crânio coberto por pele fina; (iv comprimento da nadadeira adiposa 3,9 a 4,3 vezes no comprimento padrão; (v a maior altura da nadadeira adiposa 3,1 a 4.3 vezes no seu comprimento; (vi região dorsal do corpo de cor castanha com pequenas manchas arredondadas, castanho-escuras. Apesar de possuir dentes vomerianos como em Pimelodus albicans, e como em certos exemplares de P. clarias (sensu Eigenmann & Eigenmann, 1890, achamos que as verdadeiras relações desta nova espécie e sua situação genérica só poderão ser estabelecidas após uma nova boa revisão do grupo.Pimelodus paranaensis, n. sp., from the Upper Paraná basin, is described on the basis of 20 specimens. The new species can be diagnosed as follows: (1 teeth present and forming two isolated on the vomer; (2 premaxillary band of teeth with a backward projecting angle; (3 top of head covered with thin layer of skin; (4 adipose fin basis 3,9 to 4.6 in standard length; (5 greatest depth of adipose fin 3.1 to 4.3 in its length, (6 dark spots along the dorsum. In spite of having teeth on the vomer as Pimelodus albicans, and as some specimens of P. clarias (sensu Eigenmann & Eigenmann, 1890 and in being similar to Bagropsis reinhardti in many respects, we feel that the true relationships and the generic status of the new species can be established only after a thorough revision of the group.

  20. Feeding ecology of Auchenipterichthys longimanus (Siluriformes: Auchenipteridae in a riparian flooded forest of Eastern Amazonia, Brazil

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    Tiago Magalhães da Silva Freitas

    2011-01-01

    Full Text Available Feeding habits of the midnight catfish Auchenipterichthys longimanus collected in rivers of the Caxiuanã National Forest (Eastern Amazonia, Brazil were investigated through the different hydrological periods (dry, filing, flood and drawdown. A total of 589 specimens were collected throughout seven samplings between July 2008 and July 2009, of which 74 were young males, 177 adult males, 89 young females and 249 adult females. The diet composition (Alimentary index - Ai% was analyzed by a non-metric multidimensional scaling (nMDS and by the analysis of similarity (ANOSIM, which included 37 items grouped into nine categories (Aquatic insects, Other aquatic invertebrates, Arthropods fragment, Fish, Plant fragment, Seeds, Terrestrial insects, Other terrestrial invertebrates, and Terrestrial vertebrates. We also calculated the niche breadth (Levins index and the repletion index (RI%. Differences in the diet composition between hydrological seasons were registered, primarily on diet composition between dry and flood season, but changes related with sex and maturity were not observed. The midnight catfish showed more specialists feeder habit in the flood period (March 2009 and more generalist habits in the dry season (November 2008. The amount of food eaten by A. longimanus based on repletion index (RI%, did not differ significantly from sex and maturity. However, we evidenced differences in RI% when comparing the studied months. These results provide important biological information about the trophic ecology of auchenipterids fish. In view of the higher occurrence of allochthonous items, this research also underpins the importance of riparian forests as critical environments in the maintenance and conservation of wild populations of fish in the Amazon basin.Neste estudo foram investigados os hábitos alimentares do bagre Auchenipterichthys longimanus coletados em rios da Floresta Nacional de Caxiuanã (Amazônia Oriental, Brasil ao longo de diferentes períodos hidrológicos (seco, enchendo, cheio e vazando. Foram coletados 589 espécimes durante sete amostragens, entre julho de 2008 e julho de 2009, dos quais 74eram machos jovens, 177 machos adultos, 89 fêmeas jovens e 249 fêmeas adultas. A composição da dieta, analisada pelo Índice de Importância Alimentar (IAi% foi avaliada por um escalonamento multidimensional não-métrico (nMDS e pela análise de similaridade (ANOSIM, que incluiu 37 itens alimentares agrupados em nove categorias (insetos aquáticos, outros invertebrados aquáticos, fragmento de artrópodes, peixe, fragmento de planta, sementes, insetos terrestres, outros invertebrados terrestrese vertebrados terrestres. Também foram obtidos a amplitude de nicho (Índice de Levins e o Índice de Repleção (IR% da dieta do bagre. Foram observadas diferenças na composição da dieta entre os períodos hidrológicos, principalmente relacionada à estação seca e cheia, mas não houve variação na composição da dieta entre os sexos e maturidade. No período de cheia (especificamente no mês de março/2009 o bagre mostrou uma alimentação mais especialista enquanto que no período de seca (novembro/2008 os valores de amplitude de nicho classificaram-no com hábitos mais generalistas quanto a alimentação. A quantidade de alimentos ingeridos por A. longimanus com base no Índice de Repleção (IR%, não diferiram significativamente entre o sexo e maturidade. No entanto, foram evidenciadas diferenças quando comparados os meses estudados. Estes resultados fornecem informações biológicas importantes sobre a ecologia trófica de peixes da família Auchenipteridae. Tendo em vista a maior ocorrência de itens alóctones na dieta deste bagre, esta pesquisa também reforça a importância das matas ciliares em ambientes críticos na manutenção e conservação das populações selvagens de peixes na bacia amazônica.

  1. Microglanis pataxo, a new catfish from southern Bahia coastal rivers, northeastern Brazil (Siluriformes: Pseudopimelodidae)

    OpenAIRE

    Sarmento-Soares,Luisa M.; Martins-Pinheiro,Ronaldo F.; Aranda,Arion T.; Chamon,Carine C.

    2006-01-01

    A new pseudopimelodid catfish of the genus Microglanis, collected in small rivers at the lower and middle Peruípe, middle Jucuruçu and Cahy basins, in the southeastern coast of the Bahia state, is described. The new species has a comparatively high number of anal fin proximal radials, 12, shaped as thin tubes, the last one bearing a laminar extension; a pectoral fin spine with a bony point and with a smaller number of serrations on its posterior border; seven pleural ribs and a narrow head wi...

  2. A new Scleromystax species (Siluriformes: Callichthyidae from coastal rivers of southern Brazil

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    Marcelo R. Britto

    Full Text Available The recently resurrected callichthyid catfish genus Scleromystax includes species occurring in several Brazilian coastal river basins from southern Bahia to southern Santa Catarina. Several character states, especially those related to sexual dimorphism, demonstrate the monophyly of Scleromystax. Examination of Scleromystax specimens sampled from streams in the Ilha de Santa Catarina and Nova Veneza, and the rio Mampituba basin, Santa Catarina and Rio Grande do Sul States, revealed that they constitute a new taxon, and thus the southernmost record for the genus. Scleromystax salmacis, new species, has coloration similar to that of S. macropterus, differing from that species mainly by the absence of a black spot on the base of the median caudal-fin rays, and transverse blotches along the body more irregular than those in S. macropterus. In addition to differences in coloration and external and osteological characters, the new species differs from S. barbatus and S. prionotos by its more rounded snout. The new taxon is also distinguished from its congeners by the presence of a single perforated dorsolateral body plate, similar to the condition found in some Aspidoras species, orientation of the ventral keel of the scapulocoracoid, and by the absence of sexually dimorphic features.

  3. Microglanis pataxo, a new catfish from southern Bahia coastal rivers, northeastern Brazil (Siluriformes: Pseudopimelodidae

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    Luisa M. Sarmento-Soares

    Full Text Available A new pseudopimelodid catfish of the genus Microglanis, collected in small rivers at the lower and middle Peruípe, middle Jucuruçu and Cahy basins, in the southeastern coast of the Bahia state, is described. The new species has a comparatively high number of anal fin proximal radials, 12, shaped as thin tubes, the last one bearing a laminar extension; a pectoral fin spine with a bony point and with a smaller number of serrations on its posterior border; seven pleural ribs and a narrow head width. We provide information on the external morphology and also on some osteological features for the new species. A key to species is presented for the coastal drainages between Rio de Janeiro and Bahia states.

  4. New species of Parotocinclus (Siluriformes: Loricariidae) from coastal drainages of Rio de Janeiro, southeastern Brazil.

    Science.gov (United States)

    Roxo, Fábio F; Melo, Bruno F; Silva, Gabriel S C; Oliveira, Claudio

    2017-02-15

    A new species of Parotocinclus is described from tributaries of rio São João, an Atlantic coastal river of Rio de Janeiro, southeastern Brazil. The new species is distinguished from its congeners by the possession of a triangular patch of dark pigmentation on the anterior portion of the dorsal-fin base, a fully developed adipose fin, complete exposure of the ventral surface of the pectoral girdle, and a distinctive pigmentation pattern of the caudal fin. The caudal fin has a hyaline background with a large black blotch covering its anterior portion, tapering irregularly through distal portions of the ventral lobe with a hyaline rounded area, and a small patch of dark pigmentation on distal portions of the dorsal lobe.

  5. Karyotype Diversity and Evolutionary Trends in Armored Catfish Species of the Genus Harttia (Siluriformes: Loricariidae).

    Science.gov (United States)

    Blanco, Daniel Rodrigues; Vicari, Marcelo Ricardo; Lui, Roberto Laridondo; Traldi, Josiane Baccarin; Bueno, Vanessa; Martinez, Juliana de Fátima; Brandão, Heleno; Oyakawa, Osvaldo Takeshi; Moreira Filho, Orlando

    2017-04-01

    Most species of the genus Harttia inhabits the headwaters of small tributaries, but some species are restricted to the main channel of some rivers. This feature, combined with limited dispersal ability, leads to the formation of small isolated populations with reduced gene flow. Currently, there are 23 taxonomically defined and recognized species, and 17 of these are found in Brazil, distributed in several hydrographic basins. Despite this diversity, few chromosomal data for the species belonging to this genus are found in the literature. Thus, this study analyzed, by classical and molecular cytogenetics methodologies, the chromosomal diversity of this genus, to discuss the processes that are involved in the evolution and karyotype differentiation of the species of the group. Seven species of Harttia were analyzed: H. kronei, H. longipinna, H. gracilis, H. punctata, H. loricariformis, H. torrenticola, and H. carvalhoi. The chromosomal diversity found in these species includes different diploid and fundamental numbers, distinct distribution of several repetitive sequences, the presence of supernumerary chromosomes in H. longipinna and multiple sex chromosome systems of the type XX/XY 1 Y 2 in H. carvalhoi and X 1 X 1 X 2 X 2 /X 1 X 2 Y in H. punctata. Lastly, our data highlight the genus Harttia as an excellent model for evolutionary studies.

  6. Harttia merevari, a new species of catfish (Siluriformes: Loricariidae from Venezuela

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    Francisco Provenzano R.

    Full Text Available Harttia merevari, a new species of loricariid catfish, is described from eight specimens captured in the upper Caura River, Orinoco River basin, Venezuela. The new species is recognized by the following combination of characters: abdomen naked; two or three preanal plates; a bony plate before each branchial opening; seven lateral plates between the pectoral and pelvic fins; maxillary barbel short and attached to the oral disk by a fleshy fold; head dorsal surface and anterior portion of the body light or dark yellow with numerous, round black spots; posterior region of the body light or dark yellow with five black transverse bands, dorsal central area of the two anterior bands diffused. The discovery of this new species extends the distribution of the genus northwest to include the Orinoco River basin on the northern slope of the Guyana shield.

  7. The South American Mailed Catfishes of the genus Pseudoloricaria Bleeker, 1862 (Pisces, Siluriformes, Loricariidae)

    NARCIS (Netherlands)

    Isbrücker, I.J.H.; Nijssen, H.

    1976-01-01

    Two species of South American Mailed Catfishes of the genus Pseudoloricaria Bleeker, 1862 are redescribed and figured from type-specimens and additional material: Pseudoloricaria laeviuscula (Valenciennes, 1840), and Pseudoloricaria punctata (Regan, 1904). Since the provenance of the holotype of P.

  8. Three new South American mailed catfishes of the genera Rineloricaria and Loricariichthys (Pisces, Siluriformes, Loricariide)

    NARCIS (Netherlands)

    Isbrücker, I.J.H.; Nijssen, H.

    1979-01-01

    Three new species belonging to two different genera of South American mailed catfishes of the subfamily Loricariinae are described and figured. A discussion of and comparative notes on related species are added. Rineloricaria formosa n. sp. is described from the Río Inírida/Río Orinoco drainage in

  9. Phylogenetic Relationships of Five Asian Schilbid Genera Including Clupisoma (Siluriformes: Schilbeidae.

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    Jing Wang

    Full Text Available The phylogenetic relationships of Asian schilbid catfishes of the genera Clupisoma, Ailia, Horabagrus, Laides and Pseudeutropius are poorly understood, especially those of Clupisoma. Herein, we reconstruct the phylogeny of 38 species of catfishes belonging to 28 genera and 14 families using the concatenated mitochondrial genes COI, cytb, and 16S rRNA, as well as the nuclear genes RAG1 and RAG2. The resulting phylogenetic trees consistently place Clupisoma as the sister taxon of Laides, and the five representative Asian schilbid genera form two monophyletic groups with the relationships (Ailia (Laides, Clupisoma and (Horabagrus, Pseudeutropius. The so-called "Big Asia" lineage relates distantly to African schilbids. Independent analyses of the mitochondrial and nuclear DNA data yield differing trees for the two Asian schilbid groups. Analyses of the mitochondrial gene data support a sister-group relationship for (Ailia (Laides, Clupisoma and the Sisoroidea and a sister-taxon association of (Horabagrus, Pseudeutropius and the Bagridae. In contrast, analyses of the combined nuclear data indicate (Ailia (Laides, Clupisoma to be the sister group to (Horabagrus, Pseudeutropius. Our results indicate that the Horabagridae, recognized by some authors as consisting of Horabagrus, Pseudeutropius and Clupisoma does not include the latter genus. We formally erect a new family, Ailiidae fam. nov. for a monophyletic Asian group comprised of the genera Ailia, Laides and Clupisoma.

  10. A fossil loricariid catfish (Siluriformes: Loricarioidea from the Taubaté Basin, eastern Brazil

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    Maria Claudia Malabarba

    Full Text Available A new loricariid catfish is described from the Tremembé Formation (Late Oligocene to Early Miocene sediments of the Taubaté Basin in eastern São Paulo State, Brazil. Taubateia paraiba, new genus and species, is based on a single specimen preserved as a ventral-side impression of an articulated partial neurocranium, dorsal elements of the pectoral girdle and anterior vertebrae. The fossil is identified as belonging to family Loricariidae based on obvious overall similarity and the presence of diagnostic derived characters such as: odontodes, dorsal margin of metapterygoid contacting lateral ethmoid, presence of mesethmoid disk (condyle, and compound pterotic-supracleithrum bone. Also, as in most loricariids, the ossified transcapular (Baudelot's ligament plus basiocciptal lateral process form a prominent transverse wall at the occiput. Other derived characters preserved in Taubateia are synapomorphies at different levels within Loricariidae, including a wide and low parasphenoid, form of pterotic-supracleithrum, shape and position of the mesethmoid disk, a triangular lateral ethmoid with expanded posterolateral corner and a rounded and low ridge articulating with the metapterygoid, and a pointed distal margin of transverse process of the Weberian compound centrum. The derived characters recognized in this fossil are a distinctive combination for diagnosing a new genus and species but not for its unambiguous placements in any of the currently recognized loricariid subfamilies.

  11. Biological variables of Hypostomus francisci (Siluriformes: Loricariidae from Itapecerica River, Minas Gerais State, Brazil

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    CAMILA F. SALES

    2016-01-01

    Full Text Available ABSTRACT Herein we determine for the first time the reproduction parameters and population structure of Hypostomus francisci in the Itapecerica River, São Francisco Basin. A total of 250 specimens was captured quarterly between March 2010 and February 2012. Body weight, total length and weight of the gonads were obtained in the laboratory. Gonad samples were submitted to histological and histochemical techniques. Females with spawning capable ovaries were used to determine the fecundity and relative fecundity. Sex ratio with 1:1.01 (female:male was observed. Males were more numerous than females for individuals smaller than 170 mm, however the number of females was significantly greater for specimens larger than 330 mm. The length-weight relationship estimated for H. francisci indicates negative-allometric growth. Females spawning capable were observed mostly in November-December-January. Two cohorts of oocytes at a determined time evidencing the development type group-synchronic. The eggs reaching 3.4 mm and the fecundity ranged from 312-1,460 oocytes with an average of 585.81 ± 337.43 oocytes per female. The reproductive parameters and population structure of H. francisci from Itapecerica River suggested that this species showed singular reproductive tactics among congeners.

  12. Karyotype variability in neotropical catfishes of the family Pimelodidae (Teleostei: Siluriformes

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    Américo Moraes Neto

    Full Text Available Karyotypic data are presented for four species of fish belonging to the Pimelodidae family. These species show a conserved diploid number, 2n = 56 chromosomes, with different karyotypic formulae. The analyzed species showed little amount of heterochromatin located preferentially in the centromeric and telomeric regions of some chromosomes. The nucleolus organizer regions activity (Ag-NORs and the chromosomal location of ribosomal genes by fluorescent in situ hybridization (FISH, with 18S and 5S probes, showing only one chromosome pair marked bearer of ribosomal genes, the only exception was Pimelodus britskii that presented multiple NORs and syntenic location of the 18S and 5S probes. Non-Robertsonian events, as pericentric inversion and NORs duplication are requested to explain the karyotype diversification in Pseudoplatystoma from the rio Paraguay (MS, Pimelodus from the rio Iguaçu (PR, Sorubim from the rio Paraguay (MS and Steindachneridion from the rio Paraíba do Sul (SP. The obtained data for the karyotype macrostructure of these species corroborates a conserved pattern observed in Pimelodidae. On the other hand, interspecific variations detected by molecular cytogenetics markers made possible cytotaxonomic inferences and differentiation of the species here analyzed.

  13. Reproductive biology of two marine catfishes (Siluriformes, Ariidae in the Sepetiba Bay, Brazil

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    Iracema David Gomes

    2004-03-01

    Full Text Available Marine catfish are abundant in the Sepetiba Bay, a 305 km 2 area in Southeast Brazilian coast (Lat. 22º 54’-23º 04’S; Long. 43 o 44’-44 o 10’W, but the knowledge on their biology is still scanty. The reproductive biology of Sciadeichthys luniscutis (Valenciennes 1840 and Genidens genidens (Valenciennes 1839 was studied through monthly sampling, from October 1998 to September 1999. Fishes were caught with a standardized otter trawl, in the interior of Sepetiba Bay, and near to the confluence with a major freshwater contributor. Six gonadal stages were described, based on macroscopic observations of gonad form, size, weight, color and oocyte diameter, and microscopic observations of differences in size and staining in the nucleus and cytoplasm structures, as viewed through a light microscope. Changes in the gonadosomatic index (GSI and in stages of gonadal development showed what S. luniscutis spawned in Spring, while G. genidens spawned in Summer. Total spawning was shown for both species as indicated by high concentration of post-ovulatory follicles in spent stages. Fecundity was low (14-38 vitellogenic oocytes for S. luniscutis and 6-24 for G. genidens, when compared with other teleosts. Low fecundity and separation in spawning period suggest that both species are k-strategist, able to avoid interspecific competition in early stages of life cycle to optimize the use of the available nicheEl pez-gato de mar es abundante el la Bahía Sepetiba, un área de 305 km² en la costa del sureste brasileño, pero el conocimiento de su biología es aun escaso. La biología reproductiva de Sciadeichthys luniscutis y Genidens genidens fue estudiada a través de muestreos mensuales, desde octubre de 1998 a setiembre de 1999. Los peces fueron capturados con una red barredera estandarizada, en el interior de la Bahía Sepetiba, y cerca de la confluencia con un río tributario principal. Seis estadíos gonadales fueron descritos, basados en observaciones macroscópicas de diferencias en el tamaño y tinción del núcleo y estructuras citoplasmáticas, observadas a través del microscopio de luz. Los cambio en el índice gonadosomático ( y en los estadíos del desarrollo gonadal, mostraron que S. Luniscutis desova en primavera, mientras que G. genidens desova en verano. El desove fue evidenciado en ambas especies por una alta concentración de folículos post-ovulatorios en los estadios maduros. La fecundidad fue baja (14-38 oocitos vitelogénicos en S. luniscutis y 6-24 en G. genidens cuando se la compara con otros teleósteos. La baja fecundidad y la separación en el período de desove sugiere que ambas especies tienen estrategia-k, capaces de evitar competencia interespecífica en los primeros estadíos del ciclo de vida, para optimizar el uso del nicho disponibleOs bagres marinhos constituem um dos mais abundantes recursos pesqueiros da Baía de Sepetiba (Lat.22º54’-23º04’S, Long.43º34’-44º10’O, porém o conhecimento da biologia é escasso. Abiologia reprodutiva de Sciadeichthys luniscutis (Valenciennes, 1840 e Genidens genidens (Valenciennes, 1839 foi estudada através de amostragens mensais entre outubro-1998 e setembro- 1999. Os peixes foram capturados em coletas de arrasto de fundo na Baía de Sepetiba e com redes de espera, na confluência com o rio da Guarda. Foram descritas 6 fases de desenvolvimento gonadal, com base em observações macroscópicas de forma, tamanho, peso, cor e diámetro dos ovócitos, e observações microscópicas de diferenças de tamanho das estruturas celulares. Variações no índice gonadossomático (IGS e nos estádios de desenvolvimento gonadal indicaram que S. luniscutis desova na primavera, enquanto G. genidens desova no verão. A desova total apresentada por ambas espécies, foi indicada pela elevada concentração de folículos pós-ovulatórios em ovários desovados. A fecundidade foi baixa (14-38 ovócitos vitelogênicos para S. luniscutis e 6-24 para G. genidens, quando comparada a outros teleósteos. A tendência de desenvolvimento da estratégia K foi desenvolvida por ambas espécies caracterizada pelo grande tamanho dos ovócitos, baixa fecundidade, elevada proteção à prole e separação temporal no período reprodutivo, podendo ser um mecanismo para evitar competição interespecífica na Baía de Sepetiba, por estas abundantes espécies tão proximamente relacionadas

  14. Otocinclus batmani, a new species of hypoptopomatine catfish (Siluriformes: Loricariidae from Colombia and Peru

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    Pablo Lehmann A.

    Full Text Available A new species of the hypoptopomatine catfish genus Otocinclus is described from two localities in the upper Río Amazonas basin: a tributary of the Río Puré in Colombia and two tributaries to the Río Amazonas near Iquitos in Peru. The new taxon can be easily distinguished from all congeners, except Otocinclus cocama, by having a single, intensely pigmented, vertical W-shaped caudal fin spot and by having three discrete dark bands on dorsum, between the dorsal-fin base and the caudal fin. Otocinclus batmani differs from O. cocama by the absence of vertically elongated blotches from the dorsal midline to the ventral border of flanks, and by lacking a posterior extension of black pigmentation on the base of two central caudal-fin rays. Phylogenetic relationships of the new species are investigated and it is possibly more closely related to a clade formed by O. huaorani, O. mariae, O. bororo, O. mura, and O. cocama.

  15. Genetic Variation of the Endangered Neotropical Catfish Steindachneridion scriptum (Siluriformes: Pimelodidae

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    Rômulo V. Paixão

    2018-02-01

    Full Text Available Steindachneridion scriptum is an important species as a resource for fisheries and aquaculture; it is currently threatened and has a reduced occurrence in South America. The damming of rivers, overfishing, and contamination of freshwater environments are the main impacts on the maintenance of this species. We accessed the genetic diversity and structure of S. scriptum using the DNA barcode and control region (D-loop sequences of 43 individuals from the Upper Uruguay River Basin (UUR and 10 sequences from the Upper Paraná River Basin (UPR, which were obtained from GenBank. S. scriptum from the UUR and the UPR were assigned in two distinct molecular operational taxonomic units (MOTUs with higher inter-specific K2P distance than the optimum threshold (OT = 0.0079. The COI Intra-MOTU distances of S. scriptum specimens from the UUR ranged from 0.0000 to 0.0100. The control region indicated a high number of haplotypes and low nucleotide diversity, compatible with a new population in recent expansion process. Genetic structure was observed, with high differentiation between UUR and UPR basins, identified by BAPS, haplotype network, AMOVA (FST = 0.78, p < 0.05 and Mantel test. S. scriptum from the UUR showed a slight differentiation (FST = 0.068, p < 0.05, but not isolation-by-distance. Negative values of Tajima’s D and Fu’s Fs suggest recent demographic oscillations. The Bayesian skyline plot analysis indicated possible population expansion from beginning 2,500 years ago and a recent reduction in the population size. Low nucleotide diversity, spatial population structure, and the reduction of effective population size should be considered for the planning of strategies aimed at the conservation and rehabilitation of this important fisheries resource.

  16. The genus Hypostomus Lacépède, 1803, and its Surinam representatives (Siluriformes, Loricariidae)

    NARCIS (Netherlands)

    Boeseman, M.

    1968-01-01

    CONTENTS Introduction................... 3 The generic name................. 4 The type species of Hypostomus Lacépède.......... 6 The identity of Acipenser plecostomus Linnaeus........ 9 The distribution and habitats of the Surinam species........ 12 The relationship of the Surinam

  17. Systematics of the Jaguar catfish genus Liosomadoras Fowler, 1940 (Auchenipteridae: Siluriformes

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    José L. O. Birindelli

    Full Text Available Liosomadoras Fowler, 1940 includes two nominal species: L. oncinus, described from the rio Negro in Brazil, and L. morrowi described from the Peruvian Amazon. Both species are known from only few specimens deposited in fish collections, and information on these fishes is scarce. In order to rectify this situation, diagnoses of the genus and its species and an osteological description of L. oncinus are presented based on recently collected specimens. In addition, the taxonomy of the species of Liosomadoras is reviewed, and L. morrowi is confirmed as distinct from L. oncinus, and also distributed in the Brazilian Amazon. Liosomadoras is hypothesized as a relatively basal genus within Auchenipterinae, sister to all other species of the group, except Asterophysus batrachus and Tocantinsia piresi.

  18. Tapeworms (Cestoda: Proteocephalidea) of firewood catfish Sorubimichthys planiceps (Siluriformes: Pimelodidae) from the Amazon River

    Czech Academy of Sciences Publication Activity Database

    de Chambrier, A.; Scholz, Tomáš

    2008-01-01

    Roč. 55, č. 1 (2008), s. 17-28 ISSN 0015-5683 R&D Projects: GA ČR GA524/04/0342; GA ČR GD524/03/H133; GA MŠk LC522 Institutional research plan: CEZ:AV0Z60220518 Keywords : cestoda * Lenhataenia gen. n. * morphology * species survey * identification key * redescriptions * freshwater fish * Brazil * Peru Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 1.307, year: 2008

  19. New dactylogyrids (Monogenea) parasitizing the gills of catfishes (Siluriformes) from the Amazon River basin in Peru

    Czech Academy of Sciences Publication Activity Database

    Mendoza-Franco, Edgar F.; Scholz, Tomáš

    2009-01-01

    Roč. 95, č. 4 (2009), s. 865-870 ISSN 0022-3395 R&D Projects: GA MŠk LC522 Institutional research plan: CEZ:AV0Z60220518 Keywords : Monogenea * taxonomy * fish * Neotropical Region * Ancyrocephalinae * redescriptions * Auchenipteridae * Pimelodidae Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 1.195, year: 2009

  20. Revision of Wenyonia Woodland, 1923 (Cestoda: Caryophyllidea) from catfishes (Siluriformes) in Africa

    Czech Academy of Sciences Publication Activity Database

    Schaeffner, Bjoern C.; Jirků, Miloslav; Mahmoud, Z. N.; Scholz, Tomáš

    2011-01-01

    Roč. 79, č. 2 (2011), s. 83-107 ISSN 0165-5752 R&D Projects: GA ČR GA524/08/0885; GA AV ČR KJB600960813; GA MŠk LC522 Institutional research plan: CEZ:AV0Z60220518 Keywords : Wenyonia * catfishes * Africa * key to the identification * phylogenetic analysis Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 1.250, year: 2011

  1. New species and geographical records of dactylogyrids (Monogenea) of catfish (Siluriformes) from the Peruvian Amazonia

    Czech Academy of Sciences Publication Activity Database

    Mendoza-Palmero, Carlos Alonso; Scholz, Tomáš; Mendoza-Franco, E. F.; Kuchta, Roman

    2012-01-01

    Roč. 98, č. 3 (2012), s. 484-497 ISSN 0022-3395 R&D Projects: GA MŠk LC522; GA ČR GBP505/12/G112; GA ČR GD206/09/H026 Institutional research plan: CEZ:AV0Z60220518 Keywords : PARANA RIVER FLOODPLAIN * DEMIDOSPERMUS DACTYLOGYRIDAE * NEOTROPICAL MONOGENEA * ALINEMA-AMAZONICUM * TAPEWORMS CESTODA * GEN N * ANCYROCEPHALINAE * FISHES * BRAZIL * GILLS Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 1.321, year: 2012 http://www.bioone.org/doi/abs/10.1645/GE-2941.1

  2. The air-breathing cycle of Hoplosternum littorale (Hancock, 1828(Siluriformes: Callichthyidae

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    Ricardo Jucá-Chagas

    Full Text Available Hoplosternum littorale is a continuous air breather, which uses a portion of its intestine to extract oxygen from inspired air. Its air-breathing behavior occurs in four phases: 1 ascent to the water surface; 2 mouth emergence with expansion of the oral cavity for air inspiration; 3 downward swimming and oral cavity compression resulting in air swallowing and the expiration of old air from the anus; 4 return to bottom. The time required to complete the air-breathing cycle was significantly shorter for small fish compared to large fish.

  3. A new genus of Neotropical rheophilic catfishes, with four new species (Teleostei: Siluriformes: Pseudopimelodidae

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    Oscar Akio Shibatta

    2017-06-01

    Full Text Available ABSTRACT Rhyacoglanis, a new genus of the South American freshwater catfish family Pseudopimelodidae is described from cis-Andean portions of the continent. Rhyacoglanis is distinguished from other genera of the family by three synapomorphies: presence of a light blotch on the cheek; a connection between the middle of the dark caudal-fin stripe and the dark caudal-peduncle pigmentation; and 30-35 total vertebrae. Species of Rhyacoglanis are rheophilic and strongly associated with rapids and other swift-flowing waters. A phylogenetic analysis based on 41 morphological characters yields a hypothesis of monophyly of the Pseudopimelodidae and Rhyacoglanis. Pimelodus pulcher Boulenger, 1887, from the western Amazon basin is designated as type-species of the new genus and redescribed. Four new species are described: Rhyacoglanis annulatus, from the río Orinoco basin, with a nearly ringed dark band on the caudal peduncle, and a larger distance between anus and anal-fin origin; R. epiblepsis, from the rio Madeira basin, with numerous dark spots scattered on the body, and rounded caudal-fin lobes; R. paranensis, from the upper rio Paraná basin, with three distinct dark bands on the body, and 31-33 total vertebrae; and R. seminiger, from the rio Juruena basin, with subdorsal and subadipose dark bands fused anteroposteriorly, and a separate dark band on the caudal peduncle.

  4. Interspecific competition, predation, and the coexistence of three closely related neotropical armoured catfishes (Siluriformes - Callichthyidae)

    NARCIS (Netherlands)

    Mol, J.H.A.

    1995-01-01

    Tropical ecosystems are renowned for their high biodiversity with many closely related species living together. Alpha diversity of tropical freshwater fishes is also extremely high, as exemplified by the cichlid fauna of the Great African lakes and the neotropical characins. Since

  5. Sharpilosentis peruviensis n. g., n. sp. (Acanthocephala: Diplosentidae) from freshwater catfishes (Siluriformes) in the Amazonia

    Czech Academy of Sciences Publication Activity Database

    Lisitsyna, O.; Scholz, Tomáš; Kuchta, Roman

    2015-01-01

    Roč. 91, č. 2 (2015), s. 147-155 ISSN 0165-5752 R&D Projects: GA ČR GBP505/12/G112 Institutional support: RVO:60077344 Keywords : fishes * Palaecanthocephala * SEM Subject RIV: EG - Zoology Impact factor: 1.316, year: 2015

  6. A new subterranean species of Phreatobius Goeldi, 1905 (Siluriformes, Incertae sedis from the Southwestern Amazon basin

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    Oscar Akio Shibatta

    2007-01-01

    Full Text Available A new species of the previously monotypic catfish genus Phreatobius is described from an artificial well in the village of Rio Pardo, located 90 km south of the city of Porto Velho, State of Rondônia, Brazil, in the drainage area of the Rio Branco (Rio Madeira system, Amazon basin. Phreatobius dracunculus n. sp. differs from its only congener, P. cisternarum, by the absence of eyes (vs. present, the lack of dark integumentary pigmentation (vs. faint dark pigment always present, the presence of five pectoral-fin rays (vs. four, ventral procurrent rays 11-13 (vs. 22 to 26, dorsal procurrent rays 29-31 (vs. 42 to 50, fewer vertebrae (52 or 53 vs. 59 to 64 and the larger pseudotympanus. The new species shows all diagnostic characters so far proposed for Phreatobius, including an unusual red coloration in life. The localities of the two species of Phreatobius are approximately 1900 km apart. That, in association with their peculiar and mostly inaccessible habitats, indicates that the genus may be widely distributed in the Amazon basin.Uma nova espécie do gênero previamente monotípico Phreatobius é descrita de um poço artificial no Povoado de Rio Pardo, localizado 90 km ao sul da cidade de Porto Velho, Estado de Rondônia, Brasil, na área de drenagem do rio Branco (sistema do Rio Madeira, bacia Amazônica. Phreatobius dracunculus sp. n. difere da única espécie congênere, P. cisternarum, pela ausência de olhos (vs. presente, ausência de pigmentação na pele (vs. algum pigmento escuro sempre presente, presença de cinco raios na nadadeira peitoral (vs. 4, menor número de raios procorrentes ventrais 11-13 (vs. 22 a 26, e menor número de raios procorrentes dorsais 29-31 (vs. 42 a 50, menor número de vértebras (52 ou 53 vs. 59 a 64 e pseudotímpano maior. A nova espécie apresenta todos os caracteres diagnósticos propostos para Phreatobius, incluindo a conspícua coloração vermelha em vida. As localidades das duas espécies de Phreatobius estão aproximadamente a 1900 km de distância. A presença desta espécie em região tão distante da ocorrência de P. cisternarum em associação com o ambiente freático peculiar, evidenciam que o grupo pode estar amplamente distribuído na bacia amazônica.

  7. Morphological and functional diversity of the mandible in suckermouth armored catfishes (Siluriformes: Loricariidae).

    Science.gov (United States)

    Lujan, Nathan K; Armbruster, Jonathan W

    2012-01-01

    We examined the mandibles of 377 individuals representing 25 species, 12 genera, 5 tribes, and 2 subfamilies of the Loricariidae, a species-rich radiation of detritivorous-herbivorous neotropical freshwater fishes distinguished by having a ventral oral disk and jaws specialized for surface attachment and benthic feeding. Loricariid mandibles are transversely oriented and bilaterally independent, each rotating predominantly around its long axis, although rotational axes likely vary with mandibular geometry. On each mandible, we measured three traditional and three novel morphological parameters chosen primarily for their functional relevance. Five parameters were linear distances and three of these were analogous to traditional teleost in- and out-levers for mandibular adduction. The sixth parameter was insertion area of the combined adductor mandibulae muscle (AM(area)), which correlated with adductor mandibulae volume across a subset of taxa and is interpreted as being proportional to maximum force deliverable to the mandible. Multivariate analysis revealed distributions of phylogenetically diagnosed taxonomic groupings in mandibular morphospace that are consistent with an evolutionary pattern of basal niche conservatism giving rise to multiple adaptive radiations within nested clades. Correspondence between mandibular geometry and function was explored using a 3D model of spatial relationships among measured parameters, potential forces, and axes of rotation. By combining the model with known loricariid jaw kinematics, we developed explicit hypotheses for how individual parameters might relate to each other during kinesis. We hypothesize that the ratio [AM(area) /tooth row length(2) ] predicts interspecific variation in the magnitude of force entering the mandible per unit of substrate contacted during feeding. Other newly proposed metrics are hypothesized to predict variation in aspects of mandibular mechanical advantage that may be specific to Loricariidae and perhaps shared with other herbivorous and detritivorous fishes. Copyright © 2011 Wiley Periodicals, Inc.

  8. Impoundment effects in the population of Auchenipterus osteomystax (Siluriformes: Auchenipteridae: a Neotropical reservoir case

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    Elcio Barili

    2012-06-01

    Full Text Available New impoundments provide opportunities to check whether species that present enough feeding flexibility in natural conditions may take advantage of this situation and, without reproductive restriction, can occupy the most conspicuous habitat in a large reservoir (open areas and present higher success in the colonization of the new environment. We examined variations in the abundance and feeding of A. osteomystax in two environments, one natural (Sinha Mariana floodplain lake and one dammed (Manso Reservoir, during two periods: the first year after the filling phase and three years later. Our goal was to evaluate the occupation of the new hábitat (Manso Reservoir, by this species, as well as to test the hypothesis that in the reservoir, unlike the natural environment, there are remarkable changes in diet between the periods. Fish were sampled monthly in the floodplain lake and in the reservoir during two annual periods using gillnets. To evaluate the differences in abundance of A. osteomystax we employed the Kruskal -Wallis test, and the diet analysis was carried out using frequency of occurrence and volumetric methods. Temporal differences in the diet were tested by Kruskal-Wallis test using the scores from a detrended correspondence analysis. A. osteomystax was significantly more abundant in the floodplain lake, where the captures were higher than in the reservoir in almost all months analyzed, and significant variations in abundance between the two periods were not recorded in either the reservoir or the floodplain lake. The diet variation between the two periods, which had a time lag of three years between them, was much less pronounced in the natural environment, where the resource availability is essentially regulated by seasonality. Thus, our hypothesis was accepted; that is, the interannual variations in the diet of A. osteomystax are more relevant in an artificial environment than in a natural one. Rev. Biol. Trop. 60 (2: 699-708. Epub 2012 June 01.

  9. Feeding ecology of Rhinodoras dorbignyi (Kner, 1855 (Siluriformes: Doradidae in the Paranapanema River, SP, Brazil

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    Felipe Pontieri de Lima

    2016-02-01

    Full Text Available http://dx.doi.org/10.5007/2175-7925.2016v29n1p67 Studies describing the diet of fish are important to determine trophic chain relationships, habitat occupation, trophic niches, and to define food habits of species. To describe the diet of Rhinodoras dorbignyi, six collections were made bimonthly in the upper Paranapanema River, SP, from April 2010 to February 2011. Of the 63 samples collected, 30 had stomach content. The diet of this species was determined using two methods: (i alimentary index (AI% and (ii graphical analysis of feeding strategy. Based on the results, R. dorbignyi is an insectivorous species and autochthonous items play an important role in the diet of this species.

  10. Feeding ecology of Rhinodoras dorbignyi (Kner, 1855 (Siluriformes: Doradidae in the Paranapanema River, SP, Brazil

    Directory of Open Access Journals (Sweden)

    Felipe Pontieri de Lima

    2016-02-01

    Full Text Available Studies describing the diet of fish are important to determine trophic chain relationships, habitat occupation, trophic niches, and to define food habits of species. To describe the diet of Rhinodoras dorbignyi, six collections were made bimonthly in the upper Paranapanema River, SP, from April 2010 to February 2011. Of the 63 samples collected, 30 had stomach content. The diet of this species was determined using two methods: (i alimentary index (AI% and (ii graphical analysis of feeding strategy. Based on the results, R. dorbignyi is an insectivorous species and autochthonous items play an important role in the diet of this species.

  11. Tapeworms (Cestoda: Proteocephalidea) of firewood catfish Sorubimichthys planiceps (Siluriformes: Pimelodidae) from the Amazon River.

    Science.gov (United States)

    de Chambrier, Alain; Scholz, Tomás

    2008-03-01

    A survey of proteocephalidean cestodes found in the firewood catfish Sorubimichthys planiceps (Spix et Agassiz) from the Amazon River is provided. The following taxa parasitic in S. planiceps are redescribed on the basis of their type specimens and material collected recently in the Amazon River, near the type localities in Brazil, and in Iquitos, Peru: Monticellia lenha Woodland, 1933; Nomimoscolex lenha (Woodland, 1933) (syn. Proteocephalus lenha Woodland, 1933); and Monticellia megacephala Woodland, 1934, for which a new genus, Lenhataenia, is proposed, with L. megacephala (Woodland, 1934) comb. n. as its type and only species. The new genus is a member of the Monticelliinae, i.e. has all genital organs in the cortex, and is most similar to Chambriella in possessing biloculate suckers and lacking a metascolex. It differs in the morphology of the cirrus-sac that contains a strongly coiled, thick-walled internal sperm duct (vas deferens) and a muscular cirrus of the appearance typical of most proteocephalideans, whereas that of Chambriella is sigmoid, with voluminous, tightly sinuous thick-walled internal sperm duct. In addition, Lenhataenia possesses a well developed internal musculature, whereas the internal musculature of Chambriella is weakly developed, formed by a low number of muscle fibres. The scolex morphology and distribution of microtriches of Peltidocotyle lenha (Woodland, 1933) (syn. Othinoscolex lenha Woodland, 1933 and Othinoscolex myzofer Woodland, 1933), Chambriella sp. and Choanoscolex sp. are described using scanning electron microscopy. The two latter taxa may be new for science and are reported from S. planiceps for the first time.

  12. Complete mitochondrial genome of the Freshwater Catfish Rita rita (Siluriformes, Bagridae).

    Science.gov (United States)

    Lashari, Punhal; Laghari, Muhammad Younis; Xu, Peng; Zhao, Zixia; Jiang, Li; Narejo, Naeem Tariq; Deng, Yulin; Sun, Xiaowen; Zhang, Yan

    2015-01-01

    The complete mitochondrial genome of Catfish, Rita rita, was isolated by LA PCR (TakaRa LAtaq, Dalian, China); and sequenced by Sanger's method to obtain the complete mitochondrial genome, which is listed Critically Endangered and Red Listed species. The complete mitogenome was 16,449 bp in length and contains 13 typical vertebrate protein-coding genes, 2 rRNA and 22 tRNA genes. The whole genome base composition was estimated to be 33.40% A, 27.43% C, 14.26% G and 24.89% T. The complete mitochondrial genome of catfish, Rita rita provides the basis for genetic breeding and conservation studies.

  13. Molecular analysis reveals hidden diversity in Zungaro (Siluriformes: Pimelodidade): a genus of giant South American catfish.

    Science.gov (United States)

    Pires, Antonio A; Ramirez, Jorge L; Galetti, Pedro M; Troy, Waldo P; Freitas, Patricia D

    2017-06-01

    The genus Zungaro contains some of the largest catfish in South America. Two valid species are currently recognized: Zungaro jahu, inhabiting the Paraná and Paraguay basins, and Zungaro zungaro, occurring in the Amazonas and Orinoco basins. Analysing Zungaro specimens from the Amazonas, Orinoco, Paraguay and Paraná basins, based on the sequencing of COI and D-loop, we found at least three MOTUs, indicating the existence of hidden diversity within this fish group. Considering the ecological and economic values of this fish, our results are surely welcomed for its conservation, disclosing new findings on its diversity and pointing out the necessity for a detailed taxonomic revision.

  14. Phylogenetics and population genetics of Plotosus canius (Siluriformes: Plotosidae from Malaysian coastal waters

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    Nima Khalili Samani

    2016-05-01

    Full Text Available Plotosus canius (Hamilton, 1822 is a significant marine species in Malaysia from nutritional and commercial perspectives. Despite numerous fundamental research on biological characteristics of P. canius, there are various concerns on the level of population differentiation, genomic structure, and the level of genetic variability among their populations due to deficiency of genetic-based studies. Deficiency on basic contexts such as stock identification, phylogenetic relationship and population genetic structure would negatively impact their sustainable conservation. Hence, this study was conducted to characterize the genetic structure of P. canius for the first time through the application of mitochondrial Cytochrome Oxidase I (COI gene, cross amplification of Tandanus tandanus microsatellites, and a total of 117 collected specimens across five selected populations of Malaysia. The experimental results of the mitochondrial analysis revealed that the haplotype diversity and nucleotide diversity varied from 0.395–0.771 and 0.033–0.65 respectively. Moreover, the statistical analysis of microsatellites addressed a considerable heterozygote insufficiency in all populations, with average observed heterozygosity (Ho value of 0.2168, which was lower than the standard heterozygosity in marine populations (Ho = 0.79. This alongside the high Fis values estimation, high pairwise differentiation among populations and low within population variations are supposed to be associated with small sample size, and inbreeding system. Besides, the significant finding of this study was the sharing of common haplotype KR086940, which reflects a historical genetic connectivity between Peninsular Malaysia and Borneo populations due to the geological history of Southeast Asia during Pleistocene era. Demographic analyses showed that all populations were in an equilibrium state with no significant evidence of population expansion. To put it briefly, the current study has managed to provide an initial genomic database toward understanding of the genetic characterization, phylogenetic, molecular diversification and population structure in P. canius, and should be necessary highlighted for appropriate management and conservation of species. Further studies must be carried out involving more geographical and sampling sites, larger population size per site, and utilization of species specific microsatellites loci.

  15. ANALISIS DE FORMAS EN ESPECIES CHILENAS DEL GENERO TRICHOMYCTERUS (Osteichthyes: Siluriformes) UTILIZANDO MORFOMETRIA GEOMETRICA

    OpenAIRE

    Pardo, R.; Scott, S.; Vila, I.

    2005-01-01

    El género Trichomycterus incluye aproximadamente 120 especies, que se distribuyen comúnmente en las cabeceras de los ríos neotropicales. En Chile este género se encuentra ampliamente distribuido: en el altiplano (14°-22°S) Trichomycterus chungaraensis; T. laucaensis y T. rivulatus, mientras T. areolatus se distribuye entre Huasco (28° 27'S) y Chiloé (41° 27'S), presentando la mayor amplitud en extensión, y en simpatría con T. chiltoni en la cuenca del Bío Bío (36° 49'S). La diversidad de hábi...

  16. Description of a new species of Microglanis (Siluriformes: Pseudopimelodidae from the Amazon basin, Amazonas State, Brazil

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    Lucas Ribeiro Jarduli

    Full Text Available The first species of Microglanis from the rio Amazonas, Amazonas State, Brazil is described. This species differs from all congeners by the forked caudal fin, and color pattern of the supraoccipital region consisting of two elliptical and juxtaposed pale spots, besides a combination of morphometrics characters.

  17. A new species of Microglanis (Siluriformes: Pseudopimelodidae from upper rio Paraná basin, Brazil

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    Oscar Akio Shibatta

    Full Text Available Microglanis garavelloi, new species, collected in tributaries of rio Paranapanema and rio Tietê, is the first species of the genus described from upper rio Paraná basin. The new species can be distinguished from other species of Microglanis on morphometric characters, color pattern, caudal-fin shape, pectoral-spine morphology and lateral line development. Characters used specifically to distinguish M. garavelloi from M. cottoides (laguna dos Patos and rio Uruguay basins and M. parahybae (rio Paraíba do Sul basin include morphometrics, color pattern and pectoral-spine serration.

  18. Tapeworms (Cestoda: Caryophyllidea), parasites of Clarias batrachus (Pisces: Siluriformes) in the Indomalayan region.

    Science.gov (United States)

    Ash, Anirban; Scholz, Tomáš; Oros, Mikuláš; Kar, Pradip Kumar

    2011-06-01

    Revision of monozoic cestodes (Caryophyllidea) parasitic in commercially important walking catfish Clarias batrachus (L.) in tropical Asia (Indomalayan zoogeographical region) was carried out, based on the evaluation of newly collected material from India, Indonesia, and Thailand, as well as a study of type specimens. Instead of the 59 nominal taxa of 15 genera from 3 caryophyllidean families previously described, only 8 species of the Lytocestidae are considered to be valid: Bovienia indica (Niyogi, Gupta and Agarwal, 1982) n. comb.; Bovienia raipurensis (Satpute and Agarwal, 1980) Mackiewicz, 1994; Bovienia serialis (Bovien, 1926) Fuhrmann, 1931; Djombangia penetrans Bovien, 1926; Lucknowia microcephala (Bovien, 1926) n. comb.; Lytocestus indicus (Moghe, 1925) Woodland 1926; Pseudocaryophyllaeus ritai Gupta and Singh, 1983; and Pseudocaryophyllaeus tenuicollis (Bovien, 1926) n. comb. All valid species are redescribed and SEM photomicrographs of their scolices and photomicrographs of their eggs are provided for the first time. Crescentovitus Murhar, 1963, Heeradevina Srivastav and Khare, 2005, Pseudobatrachus Pathak and Srivastav, 2005, Pseudobilobulata Srivastav and Lohia, 2002, Pseudoclariasis Pathak, 2002, and Pseudoinverta Pathak, 2002 are invalidated and 50 nominal species are newly synonymized, including 4 species described from other fish hosts. Taxonomic status of the remaining caryophyllidean taxa reported from C. batrachus (at least 6 taxa) could not be clarified because of the unavailability of their original descriptions. A key to identification of caryophyllidean tapeworms parasitic in C. batrachus is provided. To avoid current inflation of descriptions of invalid taxa, researchers are strongly encouraged to work only with well-fixed material; damaged, decomposed, or strongly flattened specimens should not be used for taxonomic studies, and type specimens must always be deposited in internationally recognized collections.

  19. Molecular systematic and historical biogeography of the armored Neotropical catfishes Hypoptopomatinae and Neoplecostominae (Siluriformes: Loricariidae).

    Science.gov (United States)

    Chiachio, Márcio Cesar; Oliveira, Claudio; Montoya-Burgos, Juan I

    2008-11-01

    The Neotropics possess the greatest freshwater fish diversity of the world, rendering the study of their evolutionary history extremely challenging. Loricariidae catfishes are one of the most diverse components of the Neotropical ichthyofauna and despite a long history of classification, major issues still need elucidation. Based on a nuclear gene, we present a robust phylogeny of two former loricariid subfamilies: Hypoptopomatinae and Neoplecostominae. Our results show that Neoplecostominae is nested within Hypoptopomatinae, and is the sister group to the former Otothyrini tribe. According to our results, supplemented by morphological observations, we erect two new subfamilies, the Otothyrinae and a new Hypoptopomatinae, and modify the Neoplecostominae by including the genus Pseudotocinclus. The uncovered evolutionary relationships allow a detailed analysis of their historical biogeography. We tested two Dispersal-Extinction-Cladogenesis models for inferring the distribution range evolution of the new subfamilies, and show that the model having no constrains performs better than a model constraining long-range dispersal. The Maximum Likelihood reconstructions of ancestral ranges showed a marked division between the Amazonian origin of the Hypoptopomatinae and the eastern coastal Brazil+Upper Paraná origin of the Neoplecostominae and Otothyrinae. Markedly few instances of dispersal across the border separating the Amazon basin and the Paraná-Paraguay+eastern coastal Brazil+Uruguay were reconstructed. This result is in clear contrast with the historical biogeography of many Neotropical fishes, including other Loricariidae. Part of the dispersal limitation may be explained by divergent ecological specialization: lowland rivers versus mountain streams habitats. Moreover, because most species of the new subfamilies are small, we hypothesize that body size-related effects might limit their dispersal, like predation and energetic cost to migration. Finally, morphological and anatomical features are presented that limit or, to the contrary, enhance dispersal capability in these small and fascinating catfishes.

  20. Multilocus molecular phylogeny of the suckermouth armored catfishes (Siluriformes: Loricariidae) with a focus on subfamily Hypostominae.

    Science.gov (United States)

    Lujan, Nathan K; Armbruster, Jonathan W; Lovejoy, Nathan R; López-Fernández, Hernán

    2015-01-01

    The Neotropical catfish family Loricariidae is the fifth most species-rich vertebrate family on Earth, with over 800 valid species. The Hypostominae is its most species-rich, geographically widespread, and ecomorphologically diverse subfamily. Here, we provide a comprehensive molecular phylogenetic reappraisal of genus-level relationships in the Hypostominae based on our sequencing and analysis of two mitochondrial and three nuclear loci (4293bp total). Our most striking large-scale systematic discovery was that the tribe Hypostomini, which has traditionally been recognized as sister to tribe Ancistrini based on morphological data, was nested within Ancistrini. This required recognition of seven additional tribe-level clades: the Chaetostoma Clade, the Pseudancistrus Clade, the Lithoxus Clade, the 'Pseudancistrus' Clade, the Acanthicus Clade, the Hemiancistrus Clade, and the Peckoltia Clade. Results of our analysis, which included type- and non-type species for every valid genus in Hypostominae, support the reevaluation and restriction of several historically problematic genera, including Baryancistrus, Cordylancistrus, Hemiancistrus, and Peckoltia. Much of the deep lineage diversity in Hypostominae is restricted to Guiana Shield and northern Andean drainages, with three tribe-level clades still largely restricted to the Guiana Shield. Of the six geographically widespread clades, a paraphyletic assemblage of three contain lineages restricted to drainages west of the Andes Mountains, suggesting that early diversification of the Hypostominae predated the late Miocene surge in Andean uplift. Our results also highlight examples of trophic ecological diversification and convergence in the Loricariidae, including support for three independent origins of highly similar and globally unique morphological specializations for eating wood. Copyright © 2014 Elsevier Inc. All rights reserved.

  1. Molecular phylogeny of the highly diversified catfish subfamily Loricariinae (Siluriformes, Loricariidae) reveals incongruences with morphological classification.

    Science.gov (United States)

    Covain, Raphaël; Fisch-Muller, Sonia; Oliveira, Claudio; Mol, Jan H; Montoya-Burgos, Juan I; Dray, Stéphane

    2016-01-01

    The Loricariinae belong to the Neotropical mailed catfish family Loricariidae, the most species-rich catfish family. Among loricariids, members of the Loricariinae are united by a long and flattened caudal peduncle and the absence of an adipose fin. Despite numerous studies of the Loricariidae, there is no comprehensive phylogeny of this morphologically highly diversified subfamily. To fill this gap, we present a molecular phylogeny of this group, including 350 representatives, based on the analysis of mitochondrial and nuclear genes (8426 positions). The resulting phylogeny indicates that Loricariinae are distributed into two sister tribes: Harttiini and Loricariini. The Harttiini tribe, as classically defined, constitutes a paraphyletic assemblage and is here restricted to the three genera Harttia, Cteniloricaria, and Harttiella. Two subtribes are distinguished within Loricariini: Farlowellina and Loricariina. Within Farlowellina, the nominal genus formed a paraphyletic group, as did Sturisoma and Sturisomatichthys. Within Loricariina, Loricaria, Crossoloricaria, and Apistoloricaria are also paraphyletic. To solve these issues, and given the lack of clear morphological diagnostic features, we propose here to synonymize several genera (Quiritixys with Harttia; East Andean members of Crossoloricaria, and Apistoloricaria with Rhadinoloricaria; Ixinandria, Hemiloricaria, Fonchiiichthys, and Leliella with Rineloricaria), to restrict others (Crossoloricaria, and Sturisomatichthys to the West Andean members, and Sturisoma to the East Andean species), and to revalidate the genus Proloricaria. Copyright © 2015 Elsevier Inc. All rights reserved.

  2. Parasites of two coexisting invasive sailfin catfishes (Siluriformes: Loricariidae in a tropical region of Mexico

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    María Amparo Rodríguez-Santiago

    Full Text Available ABSTRACT Currently many species of Amazon sailfin catfishes (Loricariidae have been introduced to wild environments outside their native range. There is, however, little knowledge about their role as vectors of parasites that can infect native fish or even humans through its consumption. The aim of the present study was to determine the parasitic fauna of the invasive sailfin catfish species Pterygoplichthys pardalis (leopard pleco and P. disjunctivus (vermiculated pleco from freshwater systems in the southeast of Mexico. Four ectoparasite species were found in P. pardalis (1 protozoan: Ichthyophthirius multifiliis ; 2 monogeneans: Urocleidoides vaginoclastrum and Heteropriapulus heterotylus ; 1 digenean: Clinostomum sp., and only one in Heteropriapulus disjunctivus (H. heterotylus . No endoparasites were found. Ichthyophthirius multifiliis , U. vaginoclaustrum and Clinostomum sp. , were considered as rare species (prevalence <5% since they were found in a single individual of P. pardalis . H. heterotylus was the only species shared among both host species and it occurs throughout the year. This monogenean species represents 96% of total parasites recorded in P. pardalis and 100% in P. disjunctivus. Monthly values of prevalence, intensity and abundance of H. heterotylus in both host species showed important intra-annual variations, but not differ significantly between both hosts.

  3. Two new trans-Andean species of Imparfinis Eigenmann & Norris, 1900 (Siluriformes: Heptapteridae from Colombia

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    Armando Ortega-Lara

    Full Text Available Two new species of Imparfinis are described from the trans-Andean region of Colombia. Imparfinis timana is diagnosed by having longer anal fin base (12.4-15.5% in SL, in combination with long adipose fin (24.6-31.3% in SL, 5-6 gill rakers on the first ceratobranchial, 42-43 vertebrae and additional measurements. Imparfinis usmai is distinguished by the combination of first ray of dorsal fin longest, but not projected as a long filament, long adipose fin (21.1-27.0% in SL, maxillary barbel exceeding pelvic-fin base, 39-40 vertebrae, upper caudal-fin lobe pointed and longer than lower lobe, lower lobe rounded, 7-8 gill rakers on the first ceratobranchial, as well as additional measurements. Imparfinis timana is only known from río Guarapas, a small tributary of the upper course of the río Magdalena. Imparfinis usmai is broadly distributed in the upper basin of ríos Cauca and Magdalena, and in the lower Patía river basin. The restricted distribution of I. nemacheir to trans-Andean drainages (Atrato, Magdalena, and Lago de Maracaibo is also discussed.

  4. Effect of water flow rate and feed training on "pacamã" (Siluriforme: Pseudopimelodidae juvenile production

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    R.K. Luz

    2011-08-01

    Full Text Available The effects of different water flow rates and feed training on the production of "pacamã" Lophiosilurus alexandri juveniles were evaluated. In the first experiment, nine day post-hatch larvae (n= 2,400 were stocked at a density of 5 larvae/L. Different water flow (F rates were tested: F1 = 180; F2 = 600; F3 = 1,300; and F4 = 2,600mL/min. Artemia nauplii were offered as food during the first 15 days of active feeding. In the second experiment for feed training, 720 juveniles (total length of 22.2mm were stocked at a density of 1.5 juveniles/L. A water flow rate similar to F1 was used. The use of extruded dry diet was tested, and feed training was done with and without other enhanced flavors (Artemia nauplii or Scott emulsion. The water flow rates did not influence the survival or growth of L. alexandri. Cannibalism occurred during feed training. The worst survival, specific growth rate and high mortality were found with the use of extruded dry diet, while similar values were registered with the different feed training diets used. Reduced water flow rate can be used to lower water consumption during larviculture and feed training of L. alexandri.

  5. A new species of Ituglanis (Siluriformes: Trichomycteridae from the rio Uruguai basin, southern Brazil

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    Juliano Ferrer

    2017-10-01

    Full Text Available ABSTRACT A new species of Ituglanis associated to the grasslands of the Pampa biome is described from the rio Uruguai basin, southern Brazil. The new species is distinguished from its congeners by the low number of ribs and by a unique color pattern composed of an outer layer with scattered round black blotches equivalent in size to the eye circumference over a reddish brown background on the lateral surface of the body. We provide the genetic sequences of the mitochondrial gene Cytochrome c Oxydase subunit I (COI for three of the paratypes and discuss aspects about the recent discovery of the new species.

  6. Impoundment effects in the population of Auchenipterus osteomystax (Siluriformes: Auchenipteridae: a Neotropical reservoir case

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    Elcio Barili

    2012-06-01

    Full Text Available New impoundments provide opportunities to check whether species that present enough feeding flexibility in natural conditions may take advantage of this situation and, without reproductive restriction, can occupy the most conspicuous habitat in a large reservoir (open areas and present higher success in the colonization of the new environment. We examined variations in the abundance and feeding of A. osteomystax in two environments, one natural (Sinha Mariana floodplain lake and one dammed (Manso Reservoir, during two periods: the first year after the filling phase and three years later. Our goal was to evaluate the occupation of the new hábitat (Manso Reservoir, by this species, as well as to test the hypothesis that in the reservoir, unlike the natural environment, there are remarkable changes in diet between the periods. Fish were sampled monthly in the floodplain lake and in the reservoir during two annual periods using gillnets. To evaluate the differences in abundance of A. osteomystax we employed the Kruskal -Wallis test, and the diet analysis was carried out using frequency of occurrence and volumetric methods. Temporal differences in the diet were tested by Kruskal-Wallis test using the scores from a detrended correspondence analysis. A. osteomystax was significantly more abundant in the floodplain lake, where the captures were higher than in the reservoir in almost all months analyzed, and significant variations in abundance between the two periods were not recorded in either the reservoir or the floodplain lake. The diet variation between the two periods, which had a time lag of three years between them, was much less pronounced in the natural environment, where the resource availability is essentially regulated by seasonality. Thus, our hypothesis was accepted; that is, the interannual variations in the diet of A. osteomystax are more relevant in an artificial environment than in a natural one. Rev. Biol. Trop. 60 (2: 699-708. Epub 2012 June 01.Los embalses nuevos ofrecen la oportunidad de comprobar si especies que presentan suficiente flexibilidad en la alimentación en condiciones naturales pueden aprovechar esta situación y, sin restricciones de reproducción, ocupar la mayor parte del hábitat visible en un gran embalse (espacios abiertos, además, presentar un alto éxito en la colonización del nuevo entorno. Asimismo, examinamos variaciones en la abundancia y alimentación de A. osteomystax, en dos ambientes, uno natural (Sinha Mariana floodplain lake y otro alterado (Embalse Manso, durante dos periodos: el primer ano después de la fase de llenado y tres años más tarde. Nuestro objetivo fue evaluar la ocupación del nuevo hábitat (Embalse Manso por esta especie, así como probar la hipótesis de que en el embalse, a diferencia del ambiente natural, se producen cambios notables en la dieta entre los periodos. Los peces fueron muestreados mensualmente en el lago de la planicie de inundación y en el embalse durante dos periodos anuales con redes de enmalle. Para evaluar las diferencias en la abundancia de A. osteomystax empleamos la prueba de Kruskal-Wallis, y el análisis de la dieta se llevo a cabo con el uso de la frecuencia de ocurrencia y métodos volumétricos. Las diferencias temporales en la dieta fueron probadas con Kruskal-Wallis, se usaron los resultados a partir de un análisis de correspondencia sin tendencia. A. osteomystax fue significativamente más abundante en el lago de la llanura de inundación, donde las capturas fueron más altas, que en el embalse en casi todos los meses analizados, y no se registraron variaciones significativas en la abundancia entre los dos periodos tanto en el embalse como en el lago de inundación. La variación en la dieta entre los dos periodos, en los cuales habia un desfase de tres anos entre ellos, fue mucho menos pronunciada en el entorno natural, donde la disponibilidad de recursos es esencialmente regulada por la estacionalidad. Por lo tanto, nuestra hipótesis fue aceptada, es decir, las variaciones interanuales en la dieta de A. osteomystax son más relevantes en un ambiente artificial que en uno natural.

  7. A new species of Amaralia Fowler (Siluriformes: Aspredinidae) from the Paraná-Paraguay River Basin.

    Science.gov (United States)

    Friel, John P; Carvalho, Tiago P

    2016-03-11

    A new species of the banjo catfish genus Amaralia is described from the Paraná-Paraguay River Basin in central-western Brazil, Paraguay and northern Argentina. Amaralia oviraptor is distinguished from its single and allopatric congener, Amaralia hypsiura, by the greater number of dorsal-fin rays (3 vs. 2); by the absence of lateral contact between middle and posterior nuchal plates (vs. middle and posterior nuchal plates contacting each other laterally); and by a longer cleithral process (17.4-19.5 % of SL, mean 18.2 % vs. 14.0-17.2 % of SL, mean=15.5 %). Comments on the peculiar oophagic diet of Amaralia and an extended diagnosis of the genus are provided.

  8. A new species of Hisonotus (Siluriformes, Loricariidae from rio São Francisco basin, Brazil

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    Fábio Roxo

    2015-04-01

    Full Text Available A new species of Hisonotus is described from the rio São Francisco basin. The new species can be distinguished from congeners by having (1 a unique coloration pattern of caudal fin with one black spot extending from its origin to the ventral lobe and two dark spots at the end of the lobe’s rays; (2 odontodes forming longitudinally aligned rows on head and trunk; (3 a functional V-shaped spinelet; (4 a single rostral plate at the tip of the snout; (5 by lacking contrasting dark geometric spots on the anterodorsal region of the body; (6 a lower caudal-peduncle depth; and (7 lower counts of the lateral median plates and (8 higher premaxillary and dentary teeth. The new species is the second described species of the genus Hisonotus in the rio São Francisco basin. It was found inhabiting the marginal vegetation of the rio São Francisco and three of its tributary, rio das Velhas, rio Paraopeba and rio Formoso.

  9. Karyotypic variation of Glanidium ribeiroi Haseman, 1911 (Siluriformes, Auchenipteridae along the Iguazu river basin

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    R. L. Lui

    Full Text Available Abstract The Iguazu river is a tributary of the left margin of the Paraná river, isolated from this basin about 22 million years ago with the appearance of the Iguazu Falls. The Iguazu river is characterized by high endemism due to two factors: its rugged topography and the old isolation caused by formation of the Iguazu Falls. This study analyzed cytogenetically a population of Glanidium ribeiroi collected in a region at the final stretch of this basin, by Giemsa staining, C-banding, impregnation by silver nitrate, and FISH with probes of 5S rDNA, 18S rDNA, telomeric sequence [TTAGGG]n, and [GATA]n repeats. The diploid number was equal to 58 chromosomes. The heterochromatin was present in the terminal region of almost all chromosomes. The Ag-NORs were simple and presented interstitially on the short arm of the submetacentric pair 14, which was confirmed by FISH with 18S rDNA probe. The 5S rDNA-FISH marked only the submetacentric pair 16 on the long arm in interstitial position. The FISH with [TTAGGG]n probe presented all telomeres labeled as expected, with an absence of Interstitial Telomeric Sequence (ITS. The repetitive [GATA]n sequence was dispersed throughout the genome, with preferential location in the terminal region of all chromosomes. The data obtained are discussed herein with other species of Auchenipteridae, and other previously analyzed populations of G. ribeiroi from the Iguazu river, verifying differences among these populations, which should be mainly related to the rugged topography of this basin.

  10. Bagrichthys vaillantii (Popta, 1906), a valid species of bagrid catfish from eastern Borneo (Teleostei: Siluriformes)

    NARCIS (Netherlands)

    Ng, H.H.

    2000-01-01

    Bagrichthys vaillantii (Popta, 1906), a species of bagrid catfish previously considered a junior synonym of B. macracanthus Bleeker, 1854, is found to be a valid species distinct from the latter. It can be differentiated from B. macracanthus in having a shorter dorsal spine, smaller eye and steeper

  11. CESTODES (CARYOPHYLLIDEA) OF THE STINGING CATFISH HETEROPNEUSTES FOSSILIS (SILURIFORMES: HETEROPNEUSTIDAE) FROM ASIA

    Czech Academy of Sciences Publication Activity Database

    Ash, Anirban; Scholz, Tomáš; Oros, M.; Levron, Céline; Kar, P. K.

    2011-01-01

    Roč. 97, č. 5 (2011), s. 899-907 ISSN 0022-3395 R&D Projects: GA MŠk LC522; GA ČR GA524/08/0885; GA ČR GAP506/10/1994; GA ČR GD206/09/H026 Institutional research plan: CEZ:AV0Z60220518 Keywords : Cestoda * Indomalayan zoogeographical region * redescription Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 1.405, year: 2011

  12. Spontaneous behavior of basal Copionodontinae cave catfishes from Brazil (Teleostei, Siluriformes, Trichomycteridae

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    Bianca Rantin

    2015-08-01

    Full Text Available Cave animals are particularly interesting due to their behavioral specializations, resultant from evolution in isolation. We present data from a spontaneous behavior study (spatial distribution and preference for microhabitats of two troglobitic catfish from Brazil: Glaphyropoma spinosum and a new species of Copionodon. We compared the data with those obtained of a sympatric epigean species, Copionodon pecten. These Trichomycteridae species belong to a basal and apparently monophyletic subfamily – Copionodontinae, endemic to Chapada Diamantina, central Bahia state, eastern Brazil. We observed the fishes in natural and laboratory conditions through ad libitum and focal animal methods. Each spatial behavioral category (hidden, bottom, midwater, surface and wall swimming and stationary in the bottom was timed individually, with a sample of 12 specimens per species. Unlike most troglobitic fishes, cave copionodontines tested herein did not extend exploratory behavior to midwater, with benthonic and thigmotactic-related exploratory behavior. This behavior is possibly related to its feeding behavior specializations, strong territorialism and photophobic behavior. The epigean Copionodon species is also benthonic. The spatial behavior of the cave Copionodontinae could be interpreted as a retained and plesiomorphic character-state in relation to other trichomycterid catfishes.

  13. Histochemistry and functional organization of the dorsal skin of Ancistrus dolichopterus (Siluriformes: Loricariidae

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    Tarun K. Garg

    Full Text Available The structural organization and histo-cytochemical features of dorsal skin of Ancistrus dolichopterus (acari bodo are the main focus of this work. The epidermis, dermis and subcutis are the principal layers of the skin. The epidermis mainly consists of epithelial and mucous cells. Interspersed between them are lymphocytes, pigment cells, eosinophilic granular cells (EGC, and the taste buds as sensory structures. The high number of EGCs is implicated in general and specific immunological defense from pathogenic bacteria and multicellular parasites. The epithelial cells and mucous cells contain glycoproteins with oxidizable vicinal diols, carboxyl groups and O-sulphate esters and their high secretory activity is correlated with the bottom dwelling habit of this species. A thick stratum laxum contains overlapping osteoderms bearing denticles, and the stratum compactum make the integument thicker to help the fish in negative buoyancy for maneuvering near the bottom and protection. The entire body surface is covered by conical, backwardly directed denticles. These are composed of a dentine cone, surrounding a pulp cavity with the top covered by mineralized cap, and are the true homologues of teeth. These structures provide effective protection from abrasion and enemies. These structural peculiarities and histochemical features indicate additional physiological role of the skin of A. dolichopterus.

  14. Tapeworms (Cestoda: Proteocephalidea) of Synodontis spp. (Siluriformes) in Africa: survey of species and their redescriptions

    Czech Academy of Sciences Publication Activity Database

    de Chambrier, A.; Scholz, Tomáš; Mahmoud, Z. N.; Mariaux, J.; Jirků, Miloslav

    -, č. 2976 (2011), s. 1-14 ISSN 1175-5326 R&D Projects: GA ČR GA524/08/0885; GA MŠk LC522; GA AV ČR KJB600960813 Institutional research plan: CEZ:AV0Z60220518 Keywords : Proteocephalus * Proteocephalidae * Synodontis spp. * freshwater fish * Africa * Nile * Turkana * taxonomy * allopatric speciation * 28S rDNA * 5.8S/ITS2 Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 0.927, year: 2011

  15. A NEW GENUS AND SPECIES OF PROTEOCEPHALIDEAN (CESTODA), FROM CLARIAS CATFISHES (SILURIFORMES: CLARIIDAE) IN AFRICA

    Czech Academy of Sciences Publication Activity Database

    de Chambrier, A.; Scholz, Tomáš; Beletew, M.; Mariaux, J.

    2009-01-01

    Roč. 95, č. 1 (2009), s. 160-168 ISSN 0022-3395 R&D Projects: GA MŠk LC522; GA ČR GA524/04/0342; GA ČR GA524/08/0885 Institutional research plan: CEZ:AV0Z60220518 Keywords : CESTODA * CLARIAS * AFRICA Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 1.195, year: 2009

  16. Infection of the muscle tissue of the filter-feeding cichlid, Chaetobranchopsis orbicularis Steindachner, 1875, by Kudoa orbicularis (Myxozoa: Multivalvulidae on Marajó Island in the Brazilian Amazon region

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    J.L. Sindeaux-Neto

    Full Text Available ABSTRACT This study describes aspects of infections caused by the myxosporidian Kudoa orbicularis in filter-feeding cichlids, Chaetobranchopsis orbicularis, caught in the Arari River in the municipality of Cachoeira do Arari, on Marajó Island, Pará, Brazil. The parasite forms pseudocysts scattered throughout the striated epaxial and hypaxial muscles. Samples embedded in paraffin were analyzed histologically using hematoxylin-eosin, Gömöri, Ziehl-Neelsen, and Giemsa staining. Necropsy of the C. orbicularis specimens revealed that 100% (50/50 were infected with K. orbicularis. The specimens presented grossly abnormal muscle texture, resulting in extensive inconsistencies and weakness. Progressive softening of the muscles was observed during necropsy, indicating the rapid enzymatic autolysis of the tissue. The parasite found in the muscle tissue of C. orbicularis was identified as K. orbicularis, with clinical signs of disease being observed in the fish. The necropsy revealed extensive damage to the host organism, with well-established fibrocystic infections in the muscle fibers, associated with post mortem myoliquefaction.

  17. Estudos sobre estrutura, ciclo de vida e comportamento de Sardinella brasiliensis (Steindachner, 1879, na área entre 22ºS e 28ºS, Brasil: 3. morfologia e histologia de ovários e escala de maturidade Studies on the structure, life cycle and behaviour of Sardinella brasiliensis (Steindachner, 1879, in the region between 22ºS and 28ºS, Brazil: 3. Morphology and histology of ovaries and maturity scale

    Directory of Open Access Journals (Sweden)

    Victoria Judith Isaac-Nahum

    1983-01-01

    Full Text Available Uma melhor compreensão da dinâmica do processo reprodutivo de Sardinella brasiliensis e obtida através da associação de aspectos micro e macroscópicos das gonadas durante o ciclo sexual. O presente trabalho apresenta uma descrição das fases de desenvolvimento ovocitarias e dos estadios de maturidade dos ovarios de 119 fêmeas de S. brasiliensis, coletados na costa brasileira entre 22ºS e 28ºS. São descritas seis fases ovocitarias e duas estruturas derivadas, analisando-se as características citologicas das células germinativas durante o processo de maturação. Foram estabelecidos sete estadios: A (virgem, Bi (em início de maturação, Bf (em maturação avançada, Cf (maduro inicial, Cf (maduro desovado, D (es vaziado e R (em repouso, sendo discutida sua correspondência com outras es calas aplicadas as espécies.A better understanding of the reproductive process is obtained when histologic analysis of gonades is associated with macroscopic observations during the sexual cycles. This paper describes the developmental stages of the oocytes of the ovaries in 119 females of S. brasiliensis sampled along the Brazilian coast, between 22ºS and 28ºS. The cytologic characteristics of the germinative cells during the maturation process are given and six oocyte phases are described. Seven maturity stages are established: A (virgin, Bi (incipient maturation, Bf (advanced maturation, Ci (mature, Cf (ripe, D (spent and R (repose. These stages are compared to those presently used with respect to S. brasiliensis.

  18. A new species of Aphanoblastella (Monogenea: Dactylogyridae parasitic on Rhamdia quelen (Siluriformes: Heptapteridae from Southeastern Brazil = Nova espécie de Aphanoblastella (Monogenea: Dactylogyridae parasito de Rhamdia quelen (Siluriformes: Heptapteridae do sudeste do Brasil

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    Adriano Reder de Carvalho

    2009-07-01

    Full Text Available Aphanoblastella juizforense sp. nov. is described in the gills of the heptapterid fish Rhamdia quelen (Quoy et Gaimard, 1824 from the Paraibuna River, Juiz de Fora, Minasn Gerais State, Brazil. The new species can be separated from all congeners by the long coiledcopulatory organ with one counterclockwise ring; sinuous accessory piece and for the robust shape of the ventral bar.Aphanoblastella juizforense sp. nov. é descrita parasitando as brânquias de Rhamdia quelen (Quoy et Gaimard, 1824 do rio Paraibuna, Juiz de Fora, Estado de Minas Gerais, Brasil. A nova espécie podeser diferenciada de todas as outras espécies do gênero por apresentar o órgão copulatório alongado, em forma de espiral, em sentido anti-horário, com peça acessória sinuosa e pela constituição mais robusta da barra ventral.

  19. Descrição de uma espécie nova de Pimelodus (Siluriformes, Pimelodidae da bacia do alto rio Paraguai Description of a new species of Pimelodus (Siluriformes, Pimelodidae from upper rio Paraguai basin

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    Hugo S. de Souza-Filho

    2007-12-01

    Full Text Available Uma espécie nova, correntemente identificada como P. maculatus La Cepède, 1803, é descrita. Ela difere das demais espécies do gênero, exceto de P. maculatus e P. mysteriosus Azpelicueta, 1998, pelo padrão de colorido com máculas escuras sobre os flancos. A nova espécie é morfometricamente similar a P. argenteus Perugia, 1891 e P. mysteriosus, mas difere destas, respectivamente, pelo padrão de colorido maculado e pelo menor comprimento do barbilhão maxilar. Difere de P. maculatus por apresentar o processo supra-occipital mais robusto, com a base quase tão larga quanto o comprimento (versus mais comprido do que largo; narinas anteriores a 25% da margem anterior do focinho, na distância entre o início do focinho até as narinas posteriores (versus 33% dessa distância; serrilhas do acúleo peitoral mais desenvolvidas e presentes em mais da metade da margem anterior do acúleo (versus serrilhas leves e presentes em menos da metade desta margem; pele que recobre a cabeça muito fina, tornando conspícuas as estrias da superfície dos ossos; 22-27 (moda=24 rastros no primeiro arco branquial [versus 19-24 (moda=21]. Também foi discriminado de P. maculatus na análise morfométrica multivariada das variáveis canônicas livres do tamanho, por apresentar maiores valores da distância interorbital, largura da boca e comprimento do barbilhão maxilar e menor comprimento da base da nadadeira adiposa.A new species, formerly identified as P. maculatus La Cepède, 1803, is described. It differs from its congeners, except P. maculatus and P. mysteriosus Azpelicueta, 1998 by the color pattern with dark brown blotches in the flanks. The new species is morphometricaly similar to P. argenteus Perugia, 1891 and P. mysteriosus, differing, respectively, by the blotched color pattern and by the smaller maxillary barbel. The described new species differs from P. maculatus for presenting the supraoccipital process more robust, with base as broad as long (versus longer than broad; anterior nostrils 25% of distance between the margin of snout to posterior nostrils (versus 33% of this distance; small saws in the pectoral spine more developed and present in more than half of the anterior margin of spine (versus small saws present in less than half of that margin; very thin skin covering the head, allowing the grooves in the bones surfaces conspicuous; 22-27 (mode=24 gill rakers in the first branchial arch [versus 19-24 (mode=21]. This new species was also discriminated from P. maculatus in the size free canonical variates analysis by presenting larger values of interorbital distance, mouth width and maxillar barbel length and smaller base length of adipose-fin.

  20. Descripción histológica del ojo de Panaque nigrolineatus (Siluriformes: Loricariidae y sus implicaciones ecomorfológicas Histological structure of the eye of Panaque nigrolineatus (Siluriformes: Loricariidae, ecomorphological implications

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    SHERYLL CORCHUELO

    2012-06-01

    Full Text Available La cucha real (Panaque nigrolineatus es endémica de las cuencas del Orinoco y Amazonas. La información relacionada con el sistema visual de esta especie es muy escasa, a pesar de ser un sentido fundamental en la interacción del individuo con su ambiente. Los especímenes se clasificaron en dos grupos en base a su tamano corporal: pequenos (longitud estándar (media ± DE de 5.92 ± 1.43 cm y peso promedio de 8.50 ± 6.8 g y grandes (longitud estándar (media ± DE de 15.9 ± 0.69 cm y peso promedio de 142.48 ± 18.71 g. En los ejemplares pequenos, el ojo presentó una morfología redondeada, y en los de mayor tamano presentó una morfología ligeramente alargada. Se obtuvieron cortes histológicos de 7 μηι que fueron coloreados con las técnicas H&E y Orceína. El tamano relativo del ojo fue mayor en los ejemplares pequenos (6.46 % que en los de mayor tamano (4.55 %. El espesor de la córnea de los grupos evaluados, presentó variaciones morfométricas significativas, entre su espesor central y periférico. La esclera presentó tejido conectivo denso. Los individuos de mayor tamano corporal tienen una esclera significativamente más gruesa tanto en la región lateral como en la región posterior. Algo similar ocurre con el espesor del iris. La pupila presentó morfología omega. En el cristalino fueron evidenciadas interdigitaciones celulares ubicadas en las regiones laterales. La retina de P. nigrolineatus está compuesta por siete capas. No existen diferencias significativas entre el espesor de la retina de los dos grupos evaluados de P! nigrolineatus. Se observaron de 10 a 12 papilas del nervio óptico en la retina de P. nigrolineatus cuyo diámetro oscila entre 24.57 y 131.90 μηι. Teniendo en cuenta el análisis histológico y morfométrico del ojo de P. nigrolineatus, esta especie presenta adaptaciones orientadas a suplir los requerimientos visuales de organismos bentónicos que habitan ecosistemas con cuerpos de agua turbios, de baja luminosidad, corrientes rápidas y estructuralmente complejos.Royal pleco (Panaque nigrolineatus is endemic from the Orinoco and Amazon basins. Information related to the visual system of this fish is scant, despite this sense is essential to the interactions with the environment. Specimens were classified into two groups based on their weight and standard length: small (standard length (mean ± SD of 5.92 ± 1.43 cm and average weight (± SD 8.50 ± 6.8 g and large (standard length (mean ± SD of 15.9 ± 0.69 cm and average weight (± SD 142.48 ± 18.71 g. The eye of small individuals had a rounded morphology in contrast with the slightly elongated morphology of large individuals. Seven μΓη histological sections were obtained and stained with H&E and Orcein techniques. Relative size of the eye was higher in small individuals (6.46 % than in larger (4.55 %. Corneal central and peripheral thickness presented significant morphometric differences, in both groups. The sclera is composed of dense connective tissue. Larger individuals had a significant thicker lateral and posterior sclera than small individuals. Iris thickness behaves in a similar way. Pupil has omega morphology. Evident cellular interdigitations were located in crystalline lateral regions. P! nigrolineatus retina is composed of seven layers. There are not significant differences between retinal thickness of two groups evaluated of P. nigrolineatus. There are 10 to 12 optic nerve papillae in P. nigrolineatus retina, with different diameters (24.57-131.90 μΓη. Histological and morphometric analysis of P. nigrolineatus eye fits with adaptations designed to supply visual requirements of benthic organisms that inhabit turbid, low light, with fast currents and structurally complex ecosystems.

  1. Gonadal structure and gametogenesis of Loricaria lentiginosa Isbrücker (Pisces, Teleostei, Siluriformes Estrutura gonadal e gametogênese de Loricaria lentiginosa Isbrücker (Pisces, Teleostei, Siluriformes

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    Rodrigo J. Guimarães-Cruz

    2005-09-01

    Full Text Available The gonadal structure and gametogenesis of Loricaria lentiginosa Isbrücker, 1979 were studied through anatomical and histological techniques. Forty two males and ten females in maturation/mature stage were captured in the reservoir of Porto Colombia, Paraná river basin, Minas Gerais, using gill nets, from November 2001 to October 2002 (tri-monthly captures. Examination of the testes revealed that they were paired, elongated and not fringed organs. Histologically, the testes presented three distinct regions: cranial espermatogenic; transistion espermatogenic and secretory; and caudal exclusively secretory. Standard histochemical techniques detected neutral glycoproteins from the secretion of the tubules of the caudal region. Espermatogenesis occurred in cysts throughout the whole extension of the wall of the seminiferous tubules, which anastomosis themselves and liberated the spermatozoa into the lumen of the espermatic ducts. The ovaries were paired, saculiformes and, histologically, they presented ovigerous lamellae that contained the cells of ovogenic ancestry. The oocytes were classified into four stages, based on their cytological characteristics and the cell layers that surrounded them. Post-ovulatory follicles and vitelogenic oocytes in the follicular atresia process also were observed.A estrutura gonadal e a gametogênese de Loricaria lentiginosa Isbrücker, 1979 foram estudadas através de técnicas anatômicas e histológicas. Capturaram-se, trimestralmente, no reservatório de Porto Colômbia, bacia do rio Paraná, Minas Gerais, quarenta e dois machos e dez fêmeas nos estádios em maturação/maduro, utilizando-se redes de emalhar, no período de novembro de 2001 a outubro de 2002. Os testículos são órgãos pares, alongados e não franjados. Histologicamente, os testículos apresentam três regiões distintas: cranial espermatogênica, transição espermatogênica e secretora e caudal exclusivamente secretora. Na secreção dos túbulos da região caudal detectaram-se glicoproteínas neutras. A espermatogênese ocorre em cistos em toda a extensão da parede dos túbulos seminíferos, os quais anastomosam-se e liberam os espermatozóides no lume dos ductos espermáticos. Os ovários são órgãos pares, saculiformes e, histologicamente, apresentam lamelas ovulígeras que contém as células da linhagem ovogênica. Os ovócitos foram classificados em quatro estádios, baseando-se em suas características citológicas e nas camadas que os circundam. Folículos pós-ovulatórios e ovócitos vitelogênicos em processo de atresia folicular foram também observados.

  2. Dieta de Hatcheria macraei (Girard, 1855 (Teleostei, Siluriformes, Trichomycteridae en el río Chubut, Argentina Diet of Hatcheria macraei (Girard, 1855 (Teleostei, Siluriforms, Trichomycteridae in the Chubut River, Argentina

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    Ricardo A Ferriz

    2012-03-01

    Full Text Available Se realizó un estudio sobre la dieta de Hatcheria macraei capturados en el río Chubut, Bajada del Cóndor (43°31'21,12''S, 69°06'22,1''W, en abril 2000. El régimen alimentario de este tricomictérido correspondió al tipo carnívoro bentófago y las presas dominantes, tanto en juveniles como en adultos, fueron larvas de chironómidos, larvas de tricópteros y cladóceros. Los ejemplares adultos presentaron una mayor diversidad en la dieta que los juveniles.A study of the diet of Hatcheria macraei caught in Chubut River, Bajada del Cóndor (43°31'21,12''S; 69°06'22,1''W was performed in April 2000. The feeding regime of this Trichomycteridae agreed with the carnivorous bentophagous type, and the dominant preys of both adults and juveniles were chironomid larvae, tricopter larvae, and cladocerans. The adult specimens exhibited a more diverse diet than the juveniles.

  3. Descripción histológica del ojo de Panaque nigrolineatus (Siluriformes: Loricariidae) y sus implicaciones ecomorfológicas Histological structure of the eye of Panaque nigrolineatus (Siluriformes: Loricariidae), ecomorphological implications

    OpenAIRE

    SHERYLL CORCHUELO; MARIA L CALDAS; RENATO PEÑA; HERNÁN HURTADO; MARIO O TOVAR

    2012-01-01

    La cucha real (Panaque nigrolineatus) es endémica de las cuencas del Orinoco y Amazonas. La información relacionada con el sistema visual de esta especie es muy escasa, a pesar de ser un sentido fundamental en la interacción del individuo con su ambiente. Los especímenes se clasificaron en dos grupos en base a su tamano corporal: pequenos (longitud estándar (media ± DE) de 5.92 ± 1.43 cm y peso promedio de 8.50 ± 6.8 g) y grandes (longitud estándar (media ± DE) de 15.9 ± 0.69 cm y peso promed...

  4. A mathematical model for growth in weight of silver catfish (Rhamdia quelen (Heptapteridae, Siluriformes, Teleostei Modelo matemático para crescimento em peso de jundiá (Rhamdia quelen (Heptapteridae, Siluriformes, Teleostei

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    Ana Paula da Silva Benaduce

    2006-10-01

    Full Text Available The use of a mathematical model applied to biological science helps to predict the specific data. Based on biological data (weight and age of silver catfish, Rhamdia quelen, a mathematical model was elaborated based on a nonlinear difference equation to demonstrate the relationship between age and growth in weight. Silver catfish growth was described following the Beverton-Holt model Pt+1 = (r Pt / (1+ a Pt , where r > 0 is the maximum growth rate and a > 0 is a constant of growth inhibition. The solution of this equation is Pt= 1 /{[1/P0 - a / (r-1] 1/r t + a/ (r-1}, were P0 is the initial weight of the fish. Through this model it was observed that the female reaches the theoretical maximum weight approximately at the age of 18 years and the male at the age of 12 years in a natural environment.A formulação de modelos matemáticos aplicado às ciências biológicas auxilia na previsão de dados específicos. Fundamentado em dados biológicos (peso e idade de jundiá, Rhamdia quelen, elaborou-se um modelo matemático com base em equações a diferenças não lineares para demonstrar a relação entre idade e crescimento em peso. O crescimento do jundiá foi descrito segundo o modelo de Beverton-Holt Pt+1 = (r Pt / (1+ a Pt, onde r > 0 é a taxa de crescimento máxima e a > 0 é uma constante de inibição do crescimento. A solução dessa equação é Pt= 1 / {[1/P0 - a / (r-1] 1/r t + a/ (r-1}, onde P0 é o peso inicial do peixe. Por esse modelo foi observado que fêmeas alcançam o peso máximo aproximadamente aos 18 anos e os machos aos 12 anos, em ambiente natural.

  5. Morphological analysis of Trichomycterus areolatus Valenciennes, 1846 from southern Chilean rivers using a truss-based system (Siluriformes, Trichomycteridae

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    Nelson Colihueque

    2017-09-01

    Full Text Available Trichomycterus areolatus Valenciennes, 1846 is a small endemic catfish inhabiting the Andean river basins of Chile. In this study, the morphological variability of three T. areolatus populations, collected in two river basins from southern Chile, was assessed with multivariate analyses, including principal component analysis (PCA and discriminant function analysis (DFA. It is hypothesized that populations must segregate morphologically from each other based on the river basin that they were sampled from, since each basin presents relatively particular hydrological characteristics. Significant morphological differences among the three populations were found with PCA (ANOSIM test, r = 0.552, p < 0.0001 and DFA (Wilks’s λ = 0.036, p < 0.01. PCA accounted for a total variation of 56.16% by the first two principal components. The first Principal Component (PC1 and PC2 explained 34.72 and 21.44% of the total variation, respectively. The scatter-plot of the first two discriminant functions (DF1 on DF2 also validated the existence of three different populations. In group classification using DFA, 93.3% of the specimens were correctly-classified into their original populations. Of the total of 22 transformed truss measurements, 17 exhibited highly significant (p < 0.01 differences among populations. The data support the existence of T. areolatus morphological variation across different rivers in southern Chile, likely reflecting the geographic isolation underlying population structure of the species.

  6. An integrative framework to reevaluate the Neotropical catfish genus Guyanancistrus (Siluriformes: Loricariidae) with particular emphasis on the Guyanancistrus brevispinis complex.

    Science.gov (United States)

    Fisch-Muller, Sonia; Mol, Jan H A; Covain, Raphaël

    2018-01-01

    Characterizing and naming species becomes more and more challenging due to the increasing difficulty of accurately delineating specific bounderies. In this context, integrative taxonomy aims to delimit taxonomic units by leveraging the complementarity of multiple data sources (geography, morphology, genetics, etc.). However, while the theoretical framework of integrative taxonomy has been explicitly stated, methods for the simultaneous analysis of multiple data sets are poorly developed and in many cases different information sources are still explored successively. Multi-table methods developed in the field of community ecology provide such an intregrative framework. In particular, multiple co-inertia analysis is flexible enough to allow the integration of morphological, distributional, and genetic data in the same analysis. We have applied this powerfull approach to delimit species boundaries in a group of poorly differentiated catfishes belonging to the genus Guyanancistrus from the Guianas region of northeastern South America. Because the species G. brevispinis has been claimed to be a species complex consisting of five species, particular attention was paid to taxon. Separate analyses indicated the presence of eight distinct species of Guyanancistrus, including five new species and one new genus. However, none of the preliminary analyses revealed different lineages within G. brevispinis, and the multi-table analysis revealed three intraspecific lineages. After taxonomic clarifications and description of the new genus, species and subspecies, a reappraisal of the biogeography of Guyanancistrus members was performed. This analysis revealed three distinct dispersals from the Upper reaches of Amazonian tributaries toward coastal rivers of the Eastern Guianas Ecoregion. The central role played by the Maroni River, as gateway from the Amazon basin, was confirmed. The Maroni River was also found to be a center of speciation for Guyanancistrus (with three species and two subspecies), as well as a source of dispersal of G. brevispinis toward the other main basins of the Eastern Guianas.

  7. A new genus and two new species of dactylogyrid monogeneans from gills of Neotropical catfishes (Siluriformes: Doradidae and Loricariidae)

    Czech Academy of Sciences Publication Activity Database

    Acosta, A.A.; Scholz, Tomáš; Blasco-Costa, I.; Alves, Philippe Vieira; Da Silva, R.J.

    2018-01-01

    Roč. 67, č. 1 (2018), s. 4-12 ISSN 1383-5769 R&D Projects: GA ČR(CZ) GBP505/12/G112 Institutional support: RVO:60077344 Keywords : South America * Loricariids * Doradids * host-associations * integrative taxonomy Subject RIV: EG - Zoology OBOR OECD: Zoology Impact factor: 1.744, year: 2016

  8. Redescription of the endangered hypoptopomatine catfish Parotocinclus spilurus (Fowler, 1941 (Siluriformes: Loricariidae from the upper rio Jaguaribe basin, northeastern Brazil

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    Telton Pedro A. Ramos

    Full Text Available Abstract Parotocinclus spilurus (Fowler was originally described as a species of Plecostomus based on six specimens collected in the rio Salgado, Icó Municipality, Ceará State, northeastern Brazil. Because the original description of P. spilurus is brief and uninformative, a detailed redescription of this endangered species based on the type series and on freshly collected topotypes was made. Data on osteology, intraspecific variation, sexual dimorphism and color pattern in life are presented for the first time, aiming at providing the necessary characters to differentiate the species from its congeners, as well as providing data on the distribution, habitat and conservation.

  9. Parotocinclus seridoensis, a new hypoptopomatine catfish (Siluriformes: Loricariidae from the upper rio Piranhas-Açu basin, northeastern Brazil

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    Telton Pedro A. Ramos

    Full Text Available A new species of Parotocinclus is described from the upper rio Piranhas-Açu basin, northeastern Brazil. The new species differs from all its congeners, except P. bidentatus, P. muriaensis (both from rio Paraíba do Sul basin, southeastern Brazil, and P. spilurus (rio Jaguaribe basin, northeastern Brazil by presenting the adipose fin rudimentary or absent. The new species differs from P. bidentatus, P. muriaensis, and P. spilurus mainly by presenting the abdomen region extensively naked, with few reduced rounded dermal platelets between the pectoral girdle and the anus. Parotocinclus seridoensis is probably an endemic species of the semi-arid Caatinga, region where the genus presents high species richness.

  10. Heavy metal profile of water, sediment and freshwater cat fish, Chrysichthys nigrodigitatus (Siluriformes: Bagridae, of Cross River, Nigeria

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    Ezekiel Olatunji Ayotunde

    2012-09-01

    Full Text Available Cross River serves as a major source of drinking water, transportation, agricultural activities and fishing in Cross River State, Nigeria. Since there is no formal control of effluents discharged into the river, it is important to monitor the levels of metals contaminants in it, thus assessing its suitability for domestic and agricultural use. In order to determine this, three sampling stations designated as Ikom (Station I, Obubra Ogada (Station II and Calabar (Station III were randomly selected to study. For this, ten samples of the freshwater Silver Catfish (Chryshchythys nigrogitatus (29.4-39.5cm SL, 310-510g, sediment and water were collected from each sampling Station from June 2009-June 2010. The heavy metals profiles of Zn, Cu, Fe, Co, Pb, Cd and Cr, in water, sediments and fish muscle were analyzed by atomic absorption spectrophotometry (AAS. In fish, the heavy metals concentration was found to be Cu>Fe>Zn>Cu>Pb>Cd>Co; the highest mean concentration of Copper (0.297±0.022 μg/g, Cadmium (0.011±0.007μg/g, Iron (0.371±0.489μg/g, Lead (0.008±0.008μg/g, were determined for the fish. In water, the order was found to be Fe>Pb>Zn>Cu>Cr>Cd>Co; the highest mean concentration of Iron (0.009±0.00μg/g, Copper (0.015±0.01 μg/g, Lead (0.0002±0.00μg/g Cadmium (0.0006±0.001μg/g, Zinc (0.0036±0.003μg/g, were observed in the surface water, respectively. The highest mean concentration of Copper (0.037±0.03μg/g, Iron (0.053±0.04μg/g, Lead (0.0002±0.00μg/g, Cobalt (0.0002±0.00μg/g, Cadmium (0.0006±0.001μg/g and Zinc (.009±0.0015μg/g was observed in the bottom water. In sediments, the concentration order found was Zn>Fe>Cu>Pb>Co>Cd; the highest mean concentration of 0.057±0.04μg/g, 0.043±0.03μg/g, 0.0006±0.00μg/g, 0.0002±0.00μg/g, 0.0009±0.00μg/g, 0.099±0.00404μg/g in Iron, Copper, Lead, Cobalt, Cadmium and Zinc were observed in the sediment, respectively; Chromium was not detected in the sediment for the whole sampling area. Most of the heavy metals were below the maximum allowable levels set by the WHO, FEPA and USEPA, except Zinc which mean concentration of 0.099±0.00404μg/g was above the recommended limit of 0.0766μg/g of USEPA in the sediment at Ikom. This implies that the waste assimilation capacity of the river is high, a phenomenon that could be ascribed to dilution, sedimentation and continuous water exchange. This is an indication that an urban and industrial waste discharged into the Cross River has a significant effect on the ecological balance of the river. Thus fish species from the Cross River harvested are safe for human consumption.

  11. Two new species of Rineloricaria (Siluriformes: Loricariidae from the rio Iguaçu basin, southern Brazil

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    Leonardo F. S. Ingenito

    Full Text Available Rineloricaria langei and R. maacki, new species, are described from upper and middle regions of the rio Iguaçu basin, a left bank tributary of the rio Paraná basin, southern Brazil. Rineloricaria langei has narrow body and is similar to R. quadrensis, which is found in coastal rivers of Rio Grande do Sul State and is distinguishable by several morphometric characters. Rineloricaria maacki is distinguishable from all other congeners by the shape and extension of the naked area of the ventral region of pectoral girdle and other morphological characters. The presence of a naked region on the abdominal surface is shared with other species from the rio Paraná and rio Uruguay basins and coastal drainages from southeastern and southern Brazil. This may indicate a close phylogenetic relationship among these species. Similarities between the two new species and species from the aforementioned drainages also suggest close biogeographic relationship between the Paraná basin and other Brazilian coastal Atlantic drainages throughout the rio Iguaçu basin.

  12. Three new species of the armored catfish genus Loricaria (Siluriformes: Loricariidae from river channels of the Amazon basin

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    Matthew R. Thomas

    Full Text Available Three new species of Loricaria are described from large white- and black-water river channels of the Amazon basin of Brazil, the upper rio Negro drainage of southern Venezuela, and clear waters of the lower rio Tocantins. Loricaria spinulifera and L. pumila differ from other species of Loricaria by having unique patterns of abdominal plate development and hypertrophied odontodes forming conspicuous crests on dorsal surfaces of the head and predorsal plates. Both are small species of Loricaria, reaching sexual maturity at less than 120 mm SL, and exhibiting sexually dimorphic characters consistent with members of the L. cataphracta complex. Loricaria spinulifera differs from L. pumila in having a unique arrangement of buccal papillae and large thorn-like odontodes on the dorsum of the head. Loricaria pumila is the smallest known Loricaria, reaching sexual maturity at less than 80 mm SL. Loricaria lundbergi differs from other Loricaria by having a unique abdominal plate pattern, broad head, and small basicaudal plate. Loricaria lundbergi is sympatric with L. spinulifera in the lower rio Negro drainage, but is also known from the rio Baria system of the Casiquiare drainage. Loricaria pumila occurs in the lower rio Amazonas and lower rio Tocantins. All three new species exhibit varying degrees of reduction in eye size and pigmentation seen in other fishes inhabiting deep river channels of South America.

  13. Description of a new species of Ituglanis (Siluriformes: Trichomycteridae from Serra dos Carajás, rio Tocantins basin

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    Wolmar B. Wosiacki

    Full Text Available A new species of Ituglanis is described from the rio Tocantins basin, State of Pará, Brazil. Ituglanis ina, new species, is distinguished from its congeners by the presence of a dark vertical bar over the base of the caudal-fin rays (vs. no bars over caudal-fin base; and by the presence of a middle trunk line of tiny neuromasts extending along the flank until the vertical through the dorsal fin, or near the caudal-fin base (vs. no middle trunk line of tiny neuromasts. Ituglanis ina can be further distinguished by a combination of characters related to color pattern and morphology. Comments on the relationship between Ituglanis species are presented.

  14. Diet and dietary habits of the fish Schilbe mystus (Siluriformes: Schilbeidae in two artificial lakes in Southwestern Nigeria

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    Adedolapo Ayoade

    2008-12-01

    Full Text Available Diet and dietary habits of African Butter Catfish Schilbe mystus (Linne, 1766, an economically important fish in Oyan and Asejire lakes (Southwest Nigeria were examined between July 2000 and December 2001. Stomach contents were analysed using the numerical, frequency of occurrence and points methods. The fish is predatory but the diet differs among lakes and seasons. Insects were more important in the diet of small (La dieta y los hábitos alimenticios de Schilbe mystus (Linne, 1766, un pez de importancia comercial en los lagos de Oyan y Asejire (Nigeria, fueron examinados desde diciembre del 2000 a diciembre del 2001. Se realizaron análisis de contenido estomacal utilizando métodos numéricos, de frecuencia de presencia y puntuales. Existe variación estacional en los organismos seleccionados para alimento y los insectos son más importantes para peces pequeños (<18 cm. También hay diferencias en la cantidad de alimento encontrado en los estómagos de machos con respecto a las hembras de S. mystus en ambos hábitats. El patrón de selección y consumo de alimento en estas especies es distinto en los dos lagos.

  15. Biometrie sexual and ontogenetic dimorphism on the marine catfish Genidens genidens (Siluriformes, Ariidae in a tropical estuary

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    Larissa G Paiva

    2015-11-01

    Full Text Available This paper aims to study the ontogenetic sexual dimorphism of Genidens genidens in Guanabara Bay, southeastern coast of Brazil. Altogether 378 specimens were anayzed (233 females and 145 males with total length ranging from 13.3 to 43.5 cm. Specimens were measured for 12 body measurements, sex was identified and maturity stages were recorded and classified. Pearson's linear correlation reveled a significant positive correlation between total length and all other body measures, except for base adipose fin, mouth depth and eye depth for immature females. Analyses nested PERMANOVA desing showed significant differences between maturity stages for each sex, between sexes considering or not maturity stages, indicating a variation in morphometric characteristics driven by sexual dimorphism. Differences among all maturity stages were also found, indicating an ontogenetic morphological difference. But immature individuals didn't differ between sexes indicating that differentiation patterns starts with sexual development. The most important measures differing males and females were related to head characteristics, which appears to be key parameters to evaluate sexual differences. Due to male incubation of fertilized eggs and juvenile individuals <59 mm in their oral cavity, head measures are proposed to be sex dimorphism not related to reproduction, but with post reproductive fase due to ecological and biological needs.

  16. CEPF Western Ghats Special Series: Rediscovery of the threatened Western Ghats endemic sisorid catfish Glyptothorax poonaensis (Teleostei: Siluriformes: Sisoridae

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    N. Dahanukar

    2011-07-01

    Full Text Available Glyptothorax poonaensis Hora is an endemic sisorid catfish of the Western Ghats of India known only from its type locality in Mula-Mutha River, a tributary of Bhima River, at Pune. This fish has not been recorded from its type locality for more than 70 years and it was thought to be extinct. Here we report a recently discovered population of G. poonaensis from Indrayani River, a tributary of Bhima River. Based on 11 specimens, we have redescribed this species along with some comments on its taxonomy, length-weight relationship, feeding and breeding habits. We also performed molecular phylogeny of the fish by sequencing three mitochondrial genes encoding 16S ribosomal DNA, cytochrome b and cytochrome oxidase subunit I. Molecular analysis suggests that G. poonaensis is nested within a lineage of Glyptothorax species from northern and northeastern India and China. Further, our analysis reveals that southern Indian species of Glyptothorax do not form a monophyletic group. Molecular dating of divergence times indicates that G. poonaensis diverged from other northern Indian species 1.9 to 2.5 million years ago. Current knowledge suggests that the species could be found in two river basins with total extent of around 6100km2; however, the species is already suspected to be locally extinct from half of its known extent of occurrence. Furthermore, the habitat of the species may be threatened by increasing pollution, deforestation leading to siltation, halting of flow by damming, sandmining and introduced fish species. In the light of biodiversity conservation, especially in an important biodiversity hotspot like Western Ghats, such rare and endemic species needs prioritization.

  17. Genetic divergence between Pseudoplatystoma corruscans and Pseudoplatystoma reticulatum (Siluriformes: Pimelodidae in the Paraná River Basin

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    TS. Bignotto

    Full Text Available Pseudoplatystoma corruscans (Spix and Agassiz, 1829 and Pseudoplatystoma reticulatum (Eingenmann and Eigenmann, 1889 are large migratory catfishes of high biological importance and great commercial value in South America. Because fertile crossbreeds can be artificially produced in hatcheries, a high genetic proximity between these two Pimelodidae species is conceivable. Possible escape of crossbred specimens from pisciculture stations is a serious environmental concern. Despite their importance, knowledge of P. corruscans and P. reticulatum biology, ecology, population diversity and genetics is limited. In the present work, the genetic divergence between P. corruscans and P. reticulatum populations from the Paraná River Basin was analyzed on the basis of polymorphisms in ISSR fragments and in the hypervariable sequence of the mitochondrial DNA (mtDNA control region. Estimates of intraspecific haplotype (h > 0.5 and nucleotide diversities (π < 0.01 indicate that P. corruscans and P. reticulatum have survived a historical population decline, followed by a demographic expansion. The interspecific polymorphisms within the mtDNA control region and ISSR fragments were suitable as diagnostic molecular markers and could be used to discriminate the two species. A unique Pseudoplatystoma specimen, captured in the Upper Paraná River Floodplain, was identified by these DNA diagnostic markers as a hybrid P. reticulatum x P. corruscans, which possibly escaped from pisciculture. The integrity of the natural population of P. corruscans in the Upper Paraná River is at risk of genetic introgression or homogenization due to the presence of hybrids and the transposition of P. reticulatum upstream through the Canal da Piracema at Itaipu Dam. Data presented herein improve the understanding of the genetic relatedness between P. corruscans and P. reticulatum and represent potential tools for future programs of conservation and surveillance of genetic introgression events and the genetic integrity of these populations.

  18. A southern species of the tropical catfish genus Phractocephalus (Teleostei: Siluriformes) in the Miocene of South America

    Science.gov (United States)

    Azpelicueta, María de las Mercedes; Cione, Alberto Luis

    2016-04-01

    Catfish bones from Tortonian (Miocene) freshwater beds of central Argentina are here identified as pertaining to a new species of the tropical pimelodid genus Phractocephalus. The new species differs from the other recent and fossil species of the genus in skull, pectoral girdle and spine characters. The material was found in different localities near the city of Paraná, Entre Ríos Province. The bearing horizon is the so-called "Conglomerado osífero" which constitutes the lowermost beds of the fluvial Ituzaingó Formation. The aquatic vertebrate fauna occurring in the bearing bed shows a similar generic composition to several northern South American Miocene units where Phractocephalus remains were found. This report extends the range of Phractocephalus more than 2000 km to the South. The record is in agreement with higher global temperatures and putative ample hydrographic connections of the river basins in the Paraná area with the Amazon basin until at least the early late Miocene.

  19. A new species of sand-dwelling catfish, with a phylogenetic diagnosis of Pygidianops Myers (Siluriformes: Trichomycteridae: Glanapteryginae

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    Mário C. C. de Pinna

    Full Text Available A new species of sand-dwelling catfish genus Pygidianops, P. amphioxus, is described from the Negro and lower Amazon basins. The new species differs from its three congeners in the elongate eel-like body, the short barbels, and the small caudal fin, continuous with the body, among other traits of internal anatomy. The absence of anal fin further distinguishes P. amphioxus from all other Pygidianops species except P. magoi and the presence of eyes from all except P. cuao. The new Pygidianops seems to be the sister species to P. magoi, the two species sharing a unique mesethmoid with a dorsally-bent tip lacking cornua, and a produced articular process in the palatine for the articulation with the neurocranium. Pygidianops amphioxus is a permanent and highly-specialized inhabitant of psammic environments. Additional characters are proposed as synapomorphies of Pygidianops, including a hypertrophied symphyseal joint and associated ligament in the lower jaw; an elongate, laterally-directed, process on the dorsal surface of the premaxilla; and a rotated lower jaw, where the surface normally facing laterally in other glanapterygines is instead directed ventrally. These and other characters are incorporated into a revised phylogenetic diagnosis of Pygidianops.

  20. Cytogenetic analysis of Baryancistrus xanthellus (Siluriformes: Loricariidae: Ancistrini, an ornamental fish endemic to the Xingu River, Brazil

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    Larissa A. Medeiros

    Full Text Available ABSTRACT Baryancistrus xanthellus is a species from the Ancistrini tribe known commonly as "amarelinho " or "golden nugget pleco". It is one of the most popular and valued ornamental fishes due to its color pattern. Also, it is an endemic species from the Xingu River occurring from Volta Grande do Xingu, region where the Belo Monte Hydropower Dam is being built, to São Félix do Xingu. The current study aimed to cytogenetically characterize B. xanthellus . Results point to the maintenance of 2n=52, which is considered the most common condition for the tribe, and a single nucleolus organizer region (NOR. Mapping of the 18S rDNA confirmed the NOR sites, and the 5S rDNA was mapped in the interstitial position of a single chromosome pair. The 18S and 5S rDNA located in different pairs constitute an apomorphy in Loricariidae. Large blocks of heterochromatin are present in pairs 1 and 10 and in the regions equivalent to NOR and the 5S rDNA. Data obtained in this study corroborated with the currently accepted phylogenetic hypothesis for the Ancistrini and demonstrate evidence that the genus Baryancistrus occupies a basal position in the tribe.

  1. Heavy metal profile of water, sediment and freshwater cat fish, Chrysichthys nigrodigitatus (Siluriformes: Bagridae, of Cross River, Nigeria

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    Ezekiel Olatunji Ayotunde

    2012-09-01

    Full Text Available Cross River serves as a major source of drinking water, transportation, agricultural activities and fishing in Cross River State, Nigeria. Since there is no formal control of effluents discharged into the river, it is important to monitor the levels of metals contaminants in it, thus assessing its suitability for domestic and agricultural use. In order to determine this, three sampling stations designated as Ikom (Station I, Obubra Ogada (Station II and Calabar (Station III were randomly selected to study. For this, ten samples of the freshwater Silver Catfish (Chryshchythys nigrogitatus (29.4-39.5cm SL, 310-510g, sediment and water were collected from each sampling Station from June 2009-June 2010. The heavy metals profiles of Zn, Cu, Fe, Co, Pb, Cd and Cr, in water, sediments and fish muscle were analyzed by atomic absorption spectrophotometry (AAS. In fish, the heavy metals concentration was found to be Cu>Fe>Zn>Cu>Pb>Cd>Co; the highest mean concentration of Copper (0.297±0.022 μg/g, Cadmium (0.011±0.007μg/g, Iron (0.371±0.489μg/g, Lead (0.008±0.008μg/g, were determined for the fish. In water, the order was found to be Fe>Pb>Zn>Cu>Cr>Cd>Co; the highest mean concentration of Iron (0.009±0.00μg/g, Copper (0.015±0.01 μg/g, Lead (0.0002±0.00μg/g Cadmium (0.0006±0.001μg/g, Zinc (0.0036±0.003μg/g, were observed in the surface water, respectively. The highest mean concentration of Copper (0.037±0.03μg/g, Iron (0.053±0.04μg/g, Lead (0.0002±0.00μg/g, Cobalt (0.0002±0.00μg/g, Cadmium (0.0006±0.001μg/g and Zinc (.009±0.0015μg/g was observed in the bottom water. In sediments, the concentration order found was Zn>Fe>Cu>Pb>Co>Cd; the highest mean concentration of 0.057±0.04μg/g, 0.043±0.03μg/g, 0.0006±0.00μg/g, 0.0002±0.00μg/g, 0.0009±0.00μg/g, 0.099±0.00404μg/g in Iron, Copper, Lead, Cobalt, Cadmium and Zinc were observed in the sediment, respectively; Chromium was not detected in the sediment for the whole sampling area. Most of the heavy metals were below the maximum allowable levels set by the WHO, FEPA and USEPA, except Zinc which mean concentration of 0.099±0.00404μg/g was above the recommended limit of 0.0766μg/g of USEPA in the sediment at Ikom. This implies that the waste assimilation capacity of the river is high, a phenomenon that could be ascribed to dilution, sedimentation and continuous water exchange. This is an indication that an urban and industrial waste discharged into the Cross River has a significant effect on the ecological balance of the river. Thus fish species from the Cross River harvested are safe for human consumption.Cross River funciona como una fuente importante de agua potable, transporte, actividades agrícolas y pesqueras en el Estado Cross River, Nigeria. Dado que no existe un control formal de los efluentes vertidos en el río, es importante monitorear los niveles de metales contaminantes en el mismo, por lo tanto la evaluación de su idoneidad para el uso doméstico y agrícola. Para la determinación de lo anterior, tres estaciones de muestreo designadas como Ikom (Estación I, Obubra Ogada (Estación II y Calabar (Estación III fueron seleccionadas al azar para el estudio. Se tomaron diez muestras de “Bagre de agua dulce de plata” (Chryshchythys nigrogitatus de 29.4-39.5cm LE (longitud estándar y 310-510g de peso, sedimentos y agua fueron recolectadas en cada estación de muestreo de junio 2009 a junio 2010. Los perfiles de metales pesados de Zn, Cu, Fe, Co, Pb, Cd y Cr, en agua, sedimentos y músculos de peces fueron analizados por espectrofotometría de absorción atómica (AAS. En los peces, la concentración de metales pesados que se determinó fue Cu>Fe>Zn>Cu>Pb>Cd>Co, para los peces se determinó una mayor concentración media de cobre (0.297±0.022g/g, cadmio (0.011±0.007μg/g, hierro (0.371±0.489μg/g y plomo (0.008±0.008μg/g. En el agua, el orden se determinó como sigue: Fe>Pb>Zn>Cu>Cr>Cd>Co, con una mayor concentración promedio de hierro (0.009±0.00μg/g, cobre (0.015±0.01g/g, plomo (0.0002±0.00μg/g, cadmio (0.0006±0.001μg/g y zinc (0.0036±0.003μg/g, se observaron en la superficie del agua, respectivamente. La mayor concentración promedio de cobre (0.037±0.03μg/g, hierro (0.053±0.04μg/g, plomo (0.0002±0.00μg/g, cobalto (0.0002±0.00μg/g, cadmio (0.0006±0.001g/g y zinc (0.009±0.0015μg/g se observó en el agua del fondo. En los sedimentos, el orden de concentración fue: Zn>Fe>Cu>Pb>Co>Cd, la mayor concentración media fue de 0.057±0.04μg/g, 0.043±0.03μg/g, 0.0006±0.00μg/g, 0.0002±0.00μg/g, 0.0009±0.00μg/g y 0.099±0.00404μg/g para hierro, cobre, plomo, cobalto, cadmio y zinc, respectivamente, no se detectó cromo. La mayoría de los metales pesados por debajo de los niveles máximos permisibles establecidos por la OMS, FEPA y USEPA, con excepción de zinc cuya concentración media fue de 0.099±0.00404μg/g estuvo por encima del límite recomendado de 0.0766μg/g de EPA en el sedimento de la Estación I (Ikom. Esto implica que la capacidad de asimilación de residuos del río es alta, un fenómeno que podría atribuirse a la dilución, la sedimentación y el intercambio continuo de agua. Lo cual es una indicación de que efluentes vertidos en el Cross River por zonas urbanas e industriales tienen un efecto significativo en el equilibrio ecológico del río. Así, las especies de peces del Río Cross son seguras para el consumo humano.

  2. Diet and capture of Hypostomus strigaticeps (Siluriformes, Loricariidae in a small brazilian stream: relationship with limnological aspects

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    I. B. Cardone

    Full Text Available The purpose of this study is to ascertain whether variations in the limnological parameters of the Corumbataí river resulting from the discharge of a variety of wastes into its waters may be responsible for spatial shifts in the diet and capture of the armored catfish Hypostomus strigaticeps (Regan, 1907. Individuals were collected over a period of two years from two sites with similar physical, albeit distinct limnological characteristics. As a whole, the environmental variables (temperature, pH, dissolved oxygen, electrical conductivity, and total coliforms and fecal coliforms of the two sites were found to vary significantly. The food items found in the guts of these armored catfish (sediments, diatoms, fungi hyphae, chlorophytes, cyanophytes and non-identified material ranked differently in samples from the two sites. In the more polluted (site B, diatoms and chlorophytes ranked higher in the diet than in that of individuals caught in the more preserved location (site A. This fact may be related to the greater amount of organic material found at site B, which provides favorable environmental conditions for such algae and, consequently, for algivorous fishes. Even so, fewer fish were captured at site B than at site A, suggesting that although food is more abundant in the more polluted site, its limnological conditions appear, on the whole, to be less beneficial than the conditions at site A.

  3. A new species of the Hypostomus cochliodongroup (Siluriformes: Loricariidae from the rio Aripuanã basin in Brazil

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    Cláudio H. Zawadzki

    Full Text Available A new species of Hypostomus, H. dardanelos, is described from the rio Aripuanã basin, a southern tributary to the rio Madeira, in northern Mato Grosso State, Brazil. The new species is assigned to the Hypostomus cochliodon group by the possession of few teeth, spoon-shaped teeth, angle between dentaries usually less than 80°, and by the absence of a notch between hyomandibular and the metapterygoid. The new species can be diagnosed from its congeners by its unique color pattern of yellowish-brown ground color covered by well-defined dark spots of relatively equal size, evenly spaced and moderately set along the dorsal region of the body and fins, except on the ventrolateral region of the caudal peduncle and proximal region of anal and caudal fins, which are devoid of spots. The new species is further diagnosed by having teeth with very small lateral cusp, fused to the mesial one and almost imperceptible; by the absence of medial buccal papillae, and by nuptial odontodes all along the body (odontodes more pronounced in some few larger specimens.

  4. The "Comb-toothed" Loricariinae of Surinam, with reflections on the phylogenetic tendencies within the family Loricariidae (Siluriformes, Siluroidei)

    NARCIS (Netherlands)

    Boeseman, M.

    1971-01-01

    CONTENTS Introduction................... 3 The nominal genera and their evaluation........... 4 The phylogeny of the higher Loricariidae........... 12 Measurements and methods............... 18 Collecting localities................. 19 Miscellaneous remarks................ 23 The Surinam species

  5. Two new species of the Hypostomus cochliodon group (Siluriformes: Loricariidae from the rio Negro basin in Brazil

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    Pedro Hollanda Carvalho

    Full Text Available Two new species of Hypostomus are described from the middle and upper rio Negro in Brazil. They are assigned to the Hypostomus cochliodon group (sensu Armbruster, 2003 by possessing few spoon-shaped teeth, and dentary angle averaging less than 80º. Hypostomus kopeyaka is described from the rio Tiquié, a tributary of the rio Uaupés, upper rio Negro basin, presents a unique color pattern among the Hypostomus species belonging to the Hypostomus cochliodon group, consisting of conspicuously horizontally elongated, closely-set black spots over the entire dorsal and lateral surfaces of the body. Hypostomus weberi is described from the middle rio Negro and can be distinguished from all remaining Hypostomus species belonging to the Hypostomus cochliodon group by possessing a unique color pattern consisting in large, rounded, widelyspaced black spots over body and fins.

  6. A New Genus and Species of Proteocephalidean Tapeworm (Cestoda) From Pangasius larnaudii (Siluriformes: Pangasiidae) In Southeast Asia

    Czech Academy of Sciences Publication Activity Database

    Scholz, Tomáš; de Chambrier, A.

    2012-01-01

    Roč. 98, č. 3 (2012), s. 648-653 ISSN 0022-3395 R&D Projects: GA ČR GBP505/12/G112 Institutional research plan: CEZ:AV0Z60220518 Keywords : PALEARCTIC REGION * REDESCRIPTION * EUCESTODA * PARASITES * FISHES Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 1.321, year: 2012 http://www.bioone.org/doi/pdf/10.1645/GE-2992.1

  7. Redescription of Houssayela sudobim (Woodland, 1935) (Cestoda: Proteocephalidea), a parasite of Pseudoplatystoma fasciatum (Pisces: Siluriformes) from the River Amazon

    Czech Academy of Sciences Publication Activity Database

    de Chambrier, A.; Scholz, Tomáš

    2005-01-01

    Roč. 62, č. 3 (2005), s. 161-169 ISSN 0165-5752 R&D Projects: GA ČR GA524/04/0342; GA ČR GD524/03/H133 Institutional research plan: CEZ:AV0Z60220518 Keywords : Cestoda * morphology * fish Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 0.786, year: 2005

  8. Understanding morphological variability in a taxonomic context in Chilean diplomystids (Teleostei: Siluriformes, including the description of a new species

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    Gloria Arratia

    2017-02-01

    Full Text Available Following study of the external morphology and its unmatched variability throughout ontogeny and a re-examination of selected morphological characters based on many specimens of diplomystids from Central and South Chile, we revised and emended previous specific diagnoses and consider Diplomystes chilensis, D. nahuelbutaensis, D. camposensis, and Olivaichthys viedmensis (Baker River to be valid species. Another group, previously identified as Diplomystes sp., D. spec., D. aff. chilensis, and D. cf. chilensis inhabiting rivers between Rapel and Itata Basins is given a new specific name (Diplomystes incognitus and is diagnosed. An identification key to the Chilean species, including the new species, is presented. All specific diagnoses are based on external morphological characters, such as aspects of the skin, neuromast lines, and main lateral line, and position of the anus and urogenital pore, as well as certain osteological characters to facilitate the identification of these species that previously was based on many internal characters. Diplomystids below 150 mm standard length (SL share a similar external morphology and body proportions that make identification difficult; however, specimens over 150 mm SL can be diagnosed by the position of the urogenital pore and anus, and a combination of external and internal morphological characters. According to current knowledge, diplomystid species have an allopatric distribution with each species apparently endemic to particular basins in continental Chile and one species (O. viedmensis known only from one river in the Chilean Patagonia, but distributed extensively in southern Argentina.

  9. Hisonotus acuen, a new and phenotypically variable cascudinho (Siluriformes, Loricariidae, Hypoptopomatinae from the upper rio Xingu basin, Brazil

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    Gabriel da Costa e Silva

    2014-09-01

    Full Text Available A new species of Hisonotus is described from the headwaters of the rio Xingu. The new species is distinguished from its congeners by having a functional V-shaped spinelet, odontodes not forming longitudinal aligned rows on the head and trunk, lower counts of the lateral and median series of abdominal figs, presence of a single rostral fig at the tip of the snout, absence of the unpaired figlets at typical adipose fin position, yellowish-tipped teeth, absence of conspicuous dark saddles and stripe on the body and higher number of teeth on the premaxillary and dentary. The new species, Hisonotus acuen, is restricted to headwaters of the rio Xingu basin, and is the first species of the genus Hisonotus described from the rio Xingu basin. Hisonotus acuen is highly variable in aspects of external body proportions, including body depth, snout length, and abdomen length. This variation is partly distributed within and among populations, and is not strongly correlated with body size. PCA of 83 adult specimens from six allopatric populations indicates the presence of continuous variation. Therefore, the available morphological data suggest that the individuals inhabiting the six localities of rio Xingu represent different populations of a single species. Low intraspecific variation in mitochondrial Cytochrome oxidase subunit I (COI provides corroborative evidence.

  10. Age, growth and mortality of Clarias gariepinus (Siluriformes: Clariidae in the Mid-Cross River-Floodplain ecosystem, Nigeria

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    Okechukwu Idumah Okogwu

    2011-12-01

    Full Text Available Clarias gariepinus is a threatened highly prized species used for some elite ceremonies by the local communities. Artisanal fishers take advantage of this species annual breeding migration from the lower Cross River to the floodplain lakes in Mid-Cross River during the rainy season, and some migrant stocks are not able to spawn. Since there is a lack of information on this species population dynamics in the Mid-Cross area, this study aimed to evaluate the age, growth and mortality to support the development of effective management plans. For this, monthly overnight gill net catches (from 6 to 72mm mesh sizes were developed between March 2005 and February 2007. Growth parameters were determined using the FiSAT II length-frequency distribution. A total of 1 421 fish were collected during the survey. The asymptotic growth (L∞ was 80.24cm, growth rate (K was 0.49/year while the longevity was 6.12years. The annual instantaneous rate of total mortality (Z was 2.54/year and the natural mortality (M was 0.88. Fishing mortality (1.66/year was higher than the biological reference points (Fopt=0.83 and Flimit=1.11 and the exploitation rate (0.66 was higher than the predicted value (Emax=0.64 indicating that C. gariepinus was over exploited in the Mid-Cross River-Floodplain ecosystem. Some recommended immediate management actions are to strengthen the ban of ichthyocide fishing, closure of the floodplain lakes for most of the year, restricted access to the migratory path of the fish during the flood period and vocational training to the fishers. In order to recover and maintain a sustainable harvest, I suggest that a multi-sector stakeholder group should be formed with governmental agents, community leaders, fishers, fisheries scientists and non-governmental organizations. These short and long term measures, if carefully applied, will facilitate recovery of the fishery. Rev. Biol. Trop. 59 (4: 1707-1716. Epub 2011 December 01.Clarias gariepinus es una especie en peligro de alto valor, usada para ceremonias de la élite de las comunidades locales. Los pescadores artesanales toman ventaja de las migraciones anuales de reproducción de esta especie, que van desde el bajo "Cross River" hasta los lagos de las planicies inundadas en "Mid-Cross River" durante la época lluviosa, y que algunas poblaciones migratorias no son capaces de generar. Debido a que hay una falta de información de la dinámica poblacional de estas especies en el área "Mid-Cross", este estudio está dirigido a evaluar la edad, crecimiento y mortalidad, para ayudar a desarrollar planes de manejo efectivos. Para esto, cada noche mensualmente se hicieron entre Marzo 2005 y Febrero 2007 recolectas con red de enmalle (de 6 a 72mm tamaños de malla. Los parámetros de crecimientos fueron determinados usando distribución FiSAT II longitud-frecuencia. Un total de 1 421 peces fueron recolectados durante el estudio. El crecimiento asintótico (L∞ fue de 80.24cm., la tasa de crecimiento (K fue 0.49/año, mientras que la longevidad fue de 6.12 años. La tasa instantánea anual de mortalidad (Z fue de 2.54/ año y la mortalidad natural (M de 0.88. La mortalidad de pesca (1.66/año fue más alta que los puntos en la referencia biológica (Fopt=0.83 and Flimit=1.11 y la tasa de explotación (0.66 fue más alta que el valor predicho (Emax=0.64, indicando que C. gariepinus es sobreexplotado en el ecosistema Mid-Cross River-Floodplain. Algunas recomendaciones de acciones inmediatas en el manejo son el endurecimiento en la prohibición de la pesca de ictiocidos, el cierre de los lagos de las planicies inundadas la mayor parte del año, acceso restringido al paso migratorio de los peces durante el periodo de inundación y entrenamiento vocacional a los pescadores. En orden de recuperar y mantener una explotación sostenible, yo sugiero que se debe formar un grupo multi-sector de las partes interesadas, con agentes del gobierno, líderes de la comunidad, pescadores, científicos de la pesca y organizaciones no gubernamentales. Estas medidas de corto y mediano plazo, aplicadas cuidadosamente, facilitaran la recuperación de la pesca.

  11. The Indo-Pacific striped eel catfish, Plotosus lineatus (Thunberg, 1787, (Osteichtyes: Siluriformes, a new record from the Mediterranean

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    Daniel Golani

    2002-09-01

    Full Text Available The striped eel catfish, Plotosus lineatus (Thunberg, 1787, is recorded for the first time from the eastern Mediterranean coast of Israel. Seventeen specimens of this highly-venomous fish were caught by a commercial trawler at depths of 20 m. This species´ occurrence in the Mediterranean is the result of migration from the Red Sea via the Suez Canal (Lessepsian migration.

  12. Taxonomic revision of the South American catfish genus Ageneiosus (Siluriformes: Auchenipteridae) with the description of four new species

    Science.gov (United States)

    Ribeiro, Frank R.V.; Rapp Py-Daniel, Lúcia H.; Walsh, Stephen J.

    2017-01-01

    The catfish genus Ageneiosus in the exclusively Neotropical family Auchenipteridae is revised. Species of Ageneiosus are widely distributed in all major South American continental drainages except the São Francisco River basin and small rivers along the Brazilian east coast. The taxonomic revision was based on examination of available type specimens, additional museum material and comparisons of original descriptions. A suite of morphometric, meristic and qualitative characters of internal and external anatomy were used to diagnose valid species and determine synonyms. Thirteen valid species are recognized in the genus Ageneiosus, some of which are widely distributed across South America. Ageneiosus pardalis is the only trans-Andean species in the genus. Ageneiosus polystictus and Ageneiosus uranophthalmus are more widely distributed than previously reported. Ageneiosus marmoratus is a junior synonym of Ageneiosus inermis. Ageneiosus dentatus is a valid species and its name is removed from the synonymy of Ageneiosus ucayalensis. Four new species are described: Ageneiosus akamai, Ageneiosus apiaka, Ageneiosus intrusus and Ageneiosus lineatus, all from the Amazon River basin. A dichotomous key for all 13 valid species of Ageneiosus species is provided.

  13. Characterization of the early development of Pseudoplatystoma reticulatum Eigenmann & Eigenmann, 1889 (Siluriformes: Pimelodidae from the Paraguay River Basin

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    Fernanda F. Andrade

    Full Text Available ABSTRACT This study described the initial development of Pseudoplatystoma reticulatum, as well as changes in growth patterns. Morphometric and meristic variables were analyzed during embryonic, larval and juvenile periods, even as allometric growth coefficients for larvae and juveniles. Eggs showed an average diameter of 1.79 mm and broad perivitelline space (23.41%. The total length (TL of the larvae ranged from 3.05 to 25.72 mm, and the total number of myomeres ranged from 45 to 50 (preanal = 13-16 and postanal = 30-35. Initial pigmentation is poor, concentrated at the extremities of the yolk sac. In the flexion stage, the pigmentation intensifies and forms a longitudinal stripe extending from the snout to the operculum and two longitudinal stripes on the body, one dorsal and the other ventral, that unite at the caudal peduncle. At first, there is a differential growth of the head and tail, and then there is the growth of the body, which shows changes in the ontogenetic priorities of feeding, swimming, and breathing capacities. Our results are very important for ecology, systematics, and hatchering, especially in terms of ontogenetic variation in morphology, growth, feeding, behavior, and mortality of P. reticulatum.

  14. Record of Iridescent shark catfish Pangasianodon hypophthalmus Sauvage, 1878 (Siluriformes: Pangasiidae from Madampa-Lake in Southwest Sri Lanka

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    Hareschandra Bandula Jayaneththi

    2015-12-01

    Full Text Available An exotic catfish was recorded at Madampa Lake in Southwest coastal zone of Sri Lanka during an ichthyofaunal survey carried out from 1st of April 2009 to 20th August 2010. The species is identified as Pangasianodon hypophthalmus, which has been described as a potentially problematic species on native fishes in some neighbouring countries of the region. This species naturally occurs in the Mekong River in South-East Asia. The observation of P. hypophthalmus is a novel record in wild habitats of Sri Lanka, where its introduction is probably an accidental release from the ornamental fish trade, but no substantial information is detected as a proof of invasion or a naturalisation of the current population.

  15. Population structure of Trachelyopterus albicrux (Siluriformes, Auchenipteridae from the Ibicuí River, Rio Grande do Sul, Brazil

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    Éverton Luis Zardo

    2012-06-01

    Full Text Available This study aimed to determine some of the biological aspects of Trachelyopterus albicrux by analyzing its population structure. The study focused on sex proportion, length and the relation of weight/length. Samples were taken every two months, from December 1999 to January 2002, in lotic and lentic environments along the Ibicui River between the cities of São Vicente do Sul and Itaqui, in Rio Grande do Sul. The following nets were used: 10m nets with 1.5, 2.0, 2.5 and 3.0cm mesh; 20m nets with 4.0, 5.0, 6.0, 8.0 and 10.0cm mesh; and 4.0/20.0, 5.0/20 and 6.0/20.0 sweep nets (all mesh sizes were in cm and measured between adjacent knots. The nets stayed in the water for 24 hours, and were checked every 6 hours. A total of 122 males and 112 females were captured, which had a standard average length (Ls of 13.27cm and a total average weight (Wt of 95.95g. There was no significant difference between the males and females. The weight/length relation was calculated using the equation Wt = 0,0224 × Ls3,1691 for males and Wt = 0,0127 × Ls3,4 for females. Trachelyopterus albicrux showed isometric growth, with the coefficient value of the linear regression equation equal to 3.1691 for males and 3.4 for females.

  16. Ritacestus gen. n. (Cestoda: Proteocephalidea) and redescription of R. ritaii comb. n., a parasite of Rita rita (Siluriformes) in India

    Czech Academy of Sciences Publication Activity Database

    de Chambrier, A.; Scholz, Tomáš; Ash, Anirban; Kar, P. K.

    2011-01-01

    Roč. 58, č. 4 (2011), s. 279-288 ISSN 0015-5683 R&D Projects: GA MŠk LC522; GA ČR GA524/08/0885; GA ČR GD206/09/H026 Institutional research plan: CEZ:AV0Z60220518 Keywords : morphology * taxonomy * neotype * Eucestoda * Gangesiinae * freshwater fish * Ganges River * India Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 1.812, year: 2011 http://www.paru.cas.cz/folia/pdfs/showpdf.php?pdf=22004

  17. Characterization of the ovary fatty acids composition of Rhamdia quelen (Quoy & Gaimard (Teleostei: Siluriformes, throughout their reproductive cycle

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    Rodrigo Vargas Anido

    Full Text Available Knowledge about gonad fatty acid composition is important for broodstock diet formulation. This study characterized ovary fatty acid composition of wild female jundiá catfish (Rhamdia quelen in their different gonadal maturation stages. Female jundiá (n = 36, average weight= 383.8 + 208.8 g were captured in the rio Uruguay, comprising all seasons. Ovaries were extracted and classified according to their gonadal maturation stage. Gonad-somatic ratio varied significantly among seasons, being higher in spring (3.7, followed by summer (2.2, winter (0.9 and autumn (0.6. Main fatty acids groups detected were: saturated (SFA= 35.5%, monounsaturated (MUFA= 28.1% and polyunsaturated fatty acids (PUFA= 33.5%. Over the four seasons, palmitic acid was recorded in large quantities, followed by docosahexaenoic acid (DHA and arachidonic acid (ARA. ARA was present in higher concentrations in immature or maturing ovaries, and its content decreased along the maturation process. Conversely, DHA and eicosapentaenoic acid (EPA contents increased during maturation. Such variation resulted in an increase in EPA/ARA and DHA/ARA ratios in mature gonads, which can be important for successful breeding. Such findings suggest that jundiá broodstock diets should contain lipids that provide long chain polyunsaturated fatty acids from both the n-3 and n-6 series to ensure gonadal maturation completion.

  18. Ritacestus gen. n. (Cestoda: Proteocephalidea) and redescription of R. ritaii comb. n., a parasite of Rita rita (Siluriformes) in India.

    Science.gov (United States)

    de Chambrier, Alain; Scholz, Tomás; Ash, Anirban; Kar, Pradip Kumar

    2011-11-01

    A new genus, Ritacestus, is proposed to accommodate Ritacestus ritaii (Verma, 1926) comb. n. (syn. Proteocephalus ritaii), a parasite of the catfish Rita rita (Hamilton) in India. The new genus, which is placed in the Gangesiinae, is characterized by (i) a small, subspherical scolex formed by four large lobes separated from one another by longitudinal grooves, with a large, widely oval to pyriform rostellum-like apical organ, larger than suckers and possessing an apical hemispherical depression; (ii) paramuscular and cortical position of some vitelline follicles (most follicles are situated medullary); (iii) ventral and dorsal bands of vitelline follicles usually uninterrupted ventral to terminal genitalia and reaching to the posterior margin of proglottides; (iv) the vagina always anterior to the cirrus-sac; (v) a large size of the body (length up to 51 cm); and (vi) development of the uterus of type 2. In its morphology, especially shape of the scolex and apical organ, and paramuscular and cortical position of some vitelline follicles, Ritacestus resembles Postgangesia Akhmerov, 1969, but differs in the presence of a genital atrium (both genital pores of Postgangesia are separate), the anterior position of the vagina (almost always posterior in the latter genus), position of vitelline follicles in cross sections (dorsal and ventral bands in Ritacestus versus only a lateral band in the latter genus), and dorsal excretory canals indistinguishable in mature and gravid proglottides of R. ritaii (well developed in Postgangesia spp.). The type and only species of the genus, R. ritaii, is redescribed on the basis of new material from the type host from the Ganges River basin in India and its neotype is designated.

  19. Serous goblet cells: the protein secreting cells in the oral cavity of a catfish, Rita rita (Hamilton, 1822) (Bagridae, Siluriformes).

    Science.gov (United States)

    Yashpal, Madhu; Mittal, Ajay Kumar

    2014-02-01

    Serous goblet cells in the oral epithelium of Rita rita are characterized by the presence of distinct eosinophilic granules occupying large parts of the cytoplasm. In R. rita, a range of histochemical results reveal that these cells are involved in proteinaceous secretions, and thus likely contribute to various functions analogous to those of mammalian saliva. The secretions of these cells have also been associated with specific functions and are discussed in relation to their physiological importance with special reference to their roles in lubrication, alteration in viscosity, various functions of mucus such as handling, maneuvering and driving of food items toward the esophagus, maintaining taste sensitivity and protection of the oral epithelium. In addition, the serous goblet cells may also be considered as the primary defensive cell of the oral epithelium of R. rita. The results significantly add to very limited set of literature on the serous goblet cells and provide noteworthy information on the mucous secretions in the oral cavity of fish. Copyright © 2013 Elsevier Ltd. All rights reserved.

  20. Diet and feeding daily rhythm of Pimelodella lateristriga (Osteichthyes, Siluriformes in a coastal stream from Serra do Mar - RJ

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    R. Mazzoni

    Full Text Available The present study was carried out in Mato Grosso fluvial system, a costal drainage from Serra do Mar. We analysed the diet and the feeding daily rhythm of Pimelodella lateristriga from samples carried out during 24 hours over a 4 hour fishing interval, in June, July and September, 2006 as well as in January and February, 2007. Diet was described from the Feeding Index (IAi and feeding daily rhythm was verified through the Gut Fullness Index (GFI. Pimelodella lateristriga diet was composed of 37 items, being aquatic insects the most important ones. IAi analysis revealed that Diptera, Trichoptera and Ephemeroptera amounted to 90% of the diet. Autochthonous invertebrates were the most important consumed items. Pimelodella lateristriga concentrated its feeding activities in the nocturnal period (10:00 PM to 2:00 AM with marked significant differences (F = 16.11; gl = 5; p < 0.05 between each diurnal and nocturnal periods. Between 6:00 AM and 6:00 PM, foraging activity was gradually reduced. We concluded that P. lateristriga has an insectivorous diet and a nocturnal feeding habit with greater activity between 10:00 PM to 2:00 AM.

  1. Morphological development of Corydoras aff. paleatus (Siluriformes, Callichthyidae) and correlation with the emergence of motor and social behaviors

    OpenAIRE

    Rodríguez-Ithurralde, Daniel; del Puerto, Gabriela; Fernández-Bornia, Fernando

    2014-01-01

    Here we examine major anatomical characteristics of Corydoras aff. paleatus (Jenyns, 1842) post-hatching development, in parallel with its neurobehavioral evolution. Eleutheroembryonic phase, 4.3-8.8 days post-fertilization (dpf); 4.3-6.4 mm standard length (SL) encompasses from hatching to transition to exogenous feeding. Protopterygiolarval phase (8.9-10.9 dpf; 6.5-6.7 mm SL) goes from feeding transition to the commencement of unpaired fin differentiation, which marks the start of pterygiol...

  2. Mechanisms of chromosomal evolution and its possible relation to natural history characteristics in Ancistrus catfishes (Siluriformes: Loricariidae).

    Science.gov (United States)

    de Oliveira, R R; Feldberg, E; Dos Anjos, M B; Zuanon, J

    2009-12-01

    Ancistrus is the most speciose genus of the tribe Ancistrini, with 58 valid species and many yet to be described. Cytogenetic studies were conducted on five apparently undescribed species from the Amazon basin, which showed different diploid numbers: Ancistrus sp. Purus (2n = 34); Ancistrus sp. Macoari (2n = 46); Ancistrus sp. Dimona (2n = 52); Ancistrus sp. Vermelho (2n = 42) and Ancistrus sp. Trombetas (2n = 38). All species possessed only one pair of NOR-carrying chromosomes, but with extensive variation in both the location on the chromosome as well as in the position of the ribosomal sites on the karyotype. The karyotypic evolution of Ancistrus species seems to be based on chromosomal rearrangements, with a tendency to a reduction of the diploid number. Two new instances of XX/XY sex chromosomes for Ancistrus species, based on the heteromorphism in the male karyotype, were also recorded. The large karyotypic diversity among Ancistrus species may be related to biological and behavioural characteristics of these fish that include microhabitat preferences, territoriality and specialized reproductive tactics. These characteristics may lead to a fast rate of fixation of chromosomal mutations and eventually speciation across the basin.

  3. Stable carbon and nitrogen incorporation in blood and fin tissue of the catfish Pterygoplichthys disjunctivus (Siluriformes, Loricariidae)

    OpenAIRE

    German, Donovan P.; Miles, Richard D.

    2010-01-01

    A feeding trial was performed in the laboratory with the catfish species Pterygoplichthys disjunctivus to determine stable carbon (13C) and nitrogen (15 N) turnover rates and discrimination factors in non-lethally sampled tissues (red blood cells, plasma solutes, and fin). A second feeding trial was conducted to determine what P. disjunctivus could assimilate from low-quality wood-detritus—refractory polysaccharides (e.g., cellulose), or soluble wood-degradation products inherent in wood-detr...

  4. Genetic structure and historical diversification of catfish Brachyplatystoma platynemum (Siluriformes: Pimelodidae) in the Amazon basin with implications for its conservation

    Science.gov (United States)

    Ochoa, Luz Eneida; Pereira, Luiz Henrique G; Costa-Silva, Guilherme Jose; Roxo, Fábio F; Batista, Jacqueline S; Formiga, Kyara; Foresti, Fausto; Oliveira, Claudio

    2015-01-01

    Brachyplatystoma platynemum is a catfish species widely distributed in the Amazon basin. Despite being considered of little commercial interest, the decline in other fish populations has contributed to the increase in the catches of this species. The structure, population genetic variability, and evolutionary process that have driven the diversification of this species are presently unknown. Considering that, in order to better understand the genetic structure of this species, we analyzed individuals from seven locations of the Amazon basin using eight molecular markers: control region and cytochrome b mtDNA sequences, and a set of six nuclear microsatellite loci. The results show high levels of haplotype diversity and point to the occurrence of two structured populations (Amazon River and the Madeira River) with high values for FST. Divergence time estimates based on mtDNA indicated that these populations diverged about 1.0 Mya (0.2–2.5 Mya 95% HPD) using cytochrome b and 1.4 Mya (0.2–2.7 Mya 95% HPD) using control region. During that time, the influence of climate changes and hydrological events such as sea level oscillations and drainage isolation as a result of geological processes in the Pleistocene may have contributed to the current structure of B. platynemum populations, as well as of differences in water chemistry in Madeira River. The strong genetic structure and the time of genetic divergence estimated for the groups may indicate the existence of strong structure populations of B. platynemum in the Amazon basin. PMID:26045952

  5. Feeding ecology of immature Lithodoras dorsalis (Valenciennes, 1840 (Siluriformes: Doradidae in a tidal environment, estuary of the rio Amazonas

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    Thiago Augusto Pedroso Barbosa

    Full Text Available Studies of feeding ecology are important for the evaluation of interactive processes in fish communities. This study evaluated the feeding ecology of Lithodoras dorsalis (Doradidae from streams within the Amazon estuary delta (Brazil, a macro-tidal area, on different pluviometric periods. A total of 371 young specimens was collected during 12 months of sampling (July 2010 to June 2011. The species diet was composed of 28 food items analyzed by Repletion Index, Alimentary Index and Niche Breadth. Young L. dorsalis was classified as herbivore with a frugivory tendency due to the high importance of fruit and seeds in its diet. Food intake varied among sampled months, with the lowest intake being recorded during the rainy-dry season transition period, and the highest at the beginning of the dry season. The importance of food items and the composition of the diet were different throughout the year, probably due to the daily tides that allow fish to access new environments and the pluviometric periods. These results provide important data on the feeding ecology of Amazonian doradids. The study also emphasized the importance of allochthonous resources, derived from the riparian forest, which reinforces the importance of this habitat for the conservation of Neotropical freshwater fishes.

  6. Morphology and 18S rDNA of Henneguya gurlei (Myxosporea) from Ameiurus nebulosus (Siluriformes) in North Carolina.

    Science.gov (United States)

    Iwanowicz, Luke R; Iwanowicz, Deborah D; Pote, Linda M; Blazer, Vicki S; Schill, William B

    2008-02-01

    Henneguya gurlei was isolated from Ameiurus nebulosus captured in North Carolina and redescribed using critical morphological features and 18S small-subunit ribosomal RNA (SSU rDNA) gene sequence. Plasmodia are white, spherical, or subspherical, occur in clusters, measure up to 1.8 mm in length, and are located on the dorsal, pectoral, and anal fins. Histologically, plasmodia are located in the dermis and subdermally, and the larger cysts disrupt the melanocyte pigment layer. The spore body is lanceolate, 18.2 +/- 0.3 microm (range 15.7-20.3) in length, and 5.4 +/- 0.1 microm (range 3.8-6.1) in width in valvular view. The caudal appendages are 41.1 +/- 1.1 microm (range 34.0-49.7) in length. Polar capsules are pyriform and of unequal size. The longer polar capsule measures 6.2 +/- 0.1 microm (range 5.48-7.06), while the shorter is 5.7 +/- 0.1 microm (range 4.8-6.4) in length. Polar capsule width is 1.2 +/- 0.03 microm (range 1.0-1.54). The total length of the spore is 60.9 +/- 1.2 microm (range 48.7-68.5). Morphologically, this species is similar to other species of Henneguya that are known to infect ictalurids. Based on SSU rDNA sequences, this species is most closely related to H. exilis and H. ictaluri, which infect Ictalurus punctatus.

  7. A new species of Trichodina Ehrenberg, 1830 (Ciliophora: Trichodinidae) infecting farmed Clarias gariepinus (Burchell) (Siluriformes: Clariidae) in Cuba.

    Science.gov (United States)

    León, Fernando Lucas Prats; Pérez, Mercedes Martínez

    2017-11-01

    A new species of Trichodina Ehrenberg, 1830 collected from the skin and fins of farmed North African catfish Clarias gariepinus (Burchell) fingerlings, is described. The new species can be distinguished from other trichodinids by the characteristics of the adhesive disc, especially by the great number of denticles. Trichodina merciae n. sp. is morphologically similar to T. renicola (Mueller, 1931) and T. marplatensis Martorelli, Marcotegui & Alda, 2008, in the number of denticles, but differs in the morphometric data, denticle morphology, environment and location. Trichodina merciae n. sp. has broad sickle-shaped blades and thin, straight rays, while T. marplatensis has broad club-shaped blades and wide S-shaped rays. Besides, denticle length, blade length, ray length, width of central part and denticle span of the new species are greater than T. marplatensis. However, the diameter of denticle ring and the diameter of the central area in T. marplatensis is larger than the ones in T. merciae n. sp. This is the first record of freshwater ectoparasite trichodinid with an average number of denticles greater than 50.

  8. A cave population of Isbrueckerichthys alipionis (Gosline, 1947 in the Upper Ribeira karst area, southeastern Brazil (Siluriformes: Loricariidae

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    Eleonora Trajano

    Full Text Available A cave population of the armored catfish Isbrueckerichthys alipionis is reported from the Santana Cave, in the rio Betari watershed, Upper Ribeira karst area, Iporanga, São Paulo State, southeastern Brazil. The cave population was compared to an epigean population of I. alipionis and no significant differences where found in morphology or degree of pigmentation. As the cave population is known for at least 30 years and is apparently isolated from epigean streams, it is classified as troglophilic. The discovery of this troglophilic species in the Santana Cave is an additional strong argument for the conservation of that cave.

  9. Histología y morfometría de piel del pez Eremophilus mutisii (Trychomecteridae, Siluriformes)

    OpenAIRE

    Bonilla Lizarazo, Rocío Johanna; Quintero Virguez, Marllury; Gómez Ramírez, Edwin; Rodríguez Caicedo, Daniel; Hurtado Giraldo, Hernán

    2008-01-01

    Se estudió la piel del pez dulceacuícola endémico de Colombia Eremophylus mutissi. Se tomaron muestras de piel (0.5x0.5 cm²) de 11 especimenes en seis partes del cuerpo (mandíbulas, cabeza dorsal, tronco dorsal, tronco caudal, tronco medial y abdominal). Se fijaron en formaldehído al 4%, con deshidratación en etanol al 95 % e isopropanol al 99%, inclusión en parafina y cortes a 5 µm. La piel está constituida por dos capas cutáneas (epidermis y dermis) y una capa subcutánea (hipodermis): la ep...

  10. Heavy metal profile of water, sediment and freshwater cat fish, Chrysichthys nigrodigitatus (Siluriformes: Bagridae), of Cross River, Nigeria.

    Science.gov (United States)

    Ayotunde, Ezekiel Olatunji; Offem, Benedict Obeten; Ada, Fidelis Bekeh

    2012-09-01

    Cross River serves as a major source of drinking water, transportation, agricultural activities and fishing in Cross River State, Nigeria. Since there is no formal control of effluents discharged into the river, it is important to monitor the levels of metals contaminants in it, thus assessing its suitability for domestic and agricultural use. In order to determine this, three sampling stations designated as Ikom (Station I), Obubra Ogada (Station II) and Calabar (Station III) were randomly selected to study. For this, ten samples of the freshwater Silver Catfish (Chryshchythys nigrogitatus) (29.4-39.5cm SL, 310-510g), sediment and water were collected from each sampling Station from June 2009-June 2010. The heavy metals profiles ofZn, Cu, Fe, Co, Pb, Cd and Cr, in water, sediments and fish muscle were analyzed by atomic absorption spectrophotometry (AAS). In fish, the heavy metals concentration was found to be Cu>Fe>Zn>Cu>Pb>Cd>Co; the highest mean concentration of Copper (0.297 +/- 0.022 microg/g), Cadmium (0.011 +/- 0.007 microg/g), Iron (0.371 +/- 0.489 microg/g), Lead (0.008 +/- 0.008 microg/g), were determined for the fish. In water, the order was found to be Fe>Pb>Zn>Cu>Cr>Cd>Co; the highest mean concentration of Iron (0.009 +/- 0.00) microg/g), Copper (0.015 +/- 0.01 microg/g), Lead (0.0002 +/- 0.00 microg/g) Cadmium (0.0006 +/- 0.001 microg/g), Zinc (0.0036 +/- 0.003 microg/g), were observed in the surface water, respectively. The highest mean concentration of Copper (0.037 +/- 0.03 microg/g), Iron (0.053 +/- 0.04 microg/g), Lead (0.0002 +/- 0.00 microg/g), Cobalt (0.0002 +/- 0.00 microg/g), Cadmium (0.0006 +/- 0.001 microg/g) and Zinc (.009 +/- 0.0015 microg/g) was observed in the bottom water. In sediments, the concentration order found was Zn>Fe>Cu>Pb>Co>Cd; the highest mean concentration of 0.057 +/- 0.04 microg/g, 0.043 +/- 0.03 microg/g, 0.0006 +/- 0.00 microg/g, 0.0002 +/- 0.00 microg/g, 0.0009 +/- 0.00 microg/g, 0.099 +/- 0.00404 microg/g in Iron, Copper, Lead, Cobalt, Cadmium and Zinc were observed in the sediment, respectively; Chromium was not detected in the sediment for the whole sampling area. Most of the heavy metals were below the maximum allowable levels set by the WHO, FEPA and USEPA, except Zinc which mean concentration of 0.099 +/- 0.00404 microg/g was above the recommended limit of 0.0766 microg/g of USEPA in the sediment at Ikom. This implies that the waste assimilation capacity of the river is high, a phenomenon that could be ascribed to dilution, sedimentation and continuous water exchange. This is an indication that an urban and industrial waste discharged into the Cross River has a significant effect on the ecological balance of the river. Thus fish species from the Cross River harvested are safe for human consumption.

  11. Redescription of Electrotaenia malopteruri (Fritsch, 1886) (Cestoda: Proteocephalidae), a parasite of Malapterurus electricus (Siluriformes: Malapteruridae) from Egypt

    Czech Academy of Sciences Publication Activity Database

    de Chambrier, A.; Scholz, Tomáš; Ibraheem, M. H.

    2004-01-01

    Roč. 57, č. 2 (2004), s. 97-109 ISSN 0165-5752 R&D Projects: GA ČR GA524/01/1314 Institutional research plan: CEZ:AV0Z6022909 Keywords : Cestoda * Proteocephalidea * taxonomy Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 0.669, year: 2004

  12. Harttia absaberi, a new species of loricariid catfish (Siluriformes: Loricariidae: Loricariinae from the upper rio Paraná basin, Brazil

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    Osvaldo Takeshi Oyakawa

    Full Text Available A new species of Harttia, tribe Harttiini, is described from tributaries of upper portions of rio Paraná drainage. The new species, the smallest known species of the genus, attaining up to 74.0 mm of standard length, can be distinguished from its congeners by the combination of the following characters: abdomen completely covered by plates, a single preanal plate, plates of the gular area in broad contact with the canal plate. Harttia absaberi is the second species of the genus known from the upper portion of rio Paraná drainage.

  13. A first insight into the barcodes for African diplostomids (Digenea: Diplostomidae): Brain parasites in Clarias gariepinus (Siluriformes: Clariidae)

    Czech Academy of Sciences Publication Activity Database

    Chibwana, F.D.; Blasco-Costa, Maria Isabel; Georgieva, Simona; Hosea, K.M.; Nkwengulila, G.; Scholz, Tomáš; Kostadinova, Aneta

    2013-01-01

    Roč. 17, JUL 2013 (2013), s. 62-70 ISSN 1567-1348 R&D Projects: GA ČR GBP505/12/G112 EU Projects: European Commission(XE) 252124 - PARAPOPGENE Institutional support: RVO:60077344 Keywords : Tylodelphys spp. * Diplostomum spp. * Clarias gariepinus * Synodontis nigrita * Tanzania * Africa Subject RIV: EB - Genetics ; Molecular Biology Impact factor: 3.264, year: 2013

  14. Redescription of Proteocephalus sulcatus (Klaptocz, 1906) (Cestoda: Proteocephalidea), a poorly known parasite of Clarotes laticeps (Pisces: Siluriformes) in the Sudan

    Czech Academy of Sciences Publication Activity Database

    de Chambrier, A.; Scholz, Tomáš; Beletew, M.; Mahmoud, Z. N.

    2007-01-01

    Roč. 114, č. 4 (2007), s. 693-702 ISSN 0035-418X R&D Projects: GA MŠk LC522; GA ČR GA524/04/0342 Institutional research plan: CEZ:AV0Z60220518 Keywords : Proteocephalus * Cestoda * Proteocephalidae * catfish parasite * Clarotes laticeps * Africa * taxonomy Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 0.376, year: 2007

  15. The late Miocene Phractocephalus catfish (Siluriformes: Pimelodidae from Urumaco, Venezuela: additional specimens and reinterpretation as a distinct species

    Directory of Open Access Journals (Sweden)

    John G. Lundberg

    Full Text Available Based on additional specimens the fossil pimelodid catfish from the upper Miocene Urumaco Formation, Falcón State, Venezuela originally assigned to the extant species Phractocephalus hemioliopterus is described as a new, extinct species. †Phractocephalus nassi n. sp. is diagnosed by the following combination of characters: 1 posterior half of frontals and anterior half of supraoccipital with elongate, coarse ridges and sulci in addition to reticulating ridges and subcircular pits; 2 very broad and ornamented mesethmoid bone; 3 lateral ethmoid margin convex and eliminating orbital notch but not projecting far anteriorly over palatine condyle; 4 anterior cranial fontanelle closed or represented by a small pit; 5 supraoccipital process rounded laterally and posterolaterally, concave posteriorly and completely concealing Weberian complex in dorsal view; 6 opercle covered with reticulating ridges and pits; 7 cleithrum coarsely ornamented along ventral edge and bulging outward lateral to spine articulation; 8 pectoral spine mostly ornamented with coarse ridges and sulci. †Phractocephalus nassi is compared to modern P. hemioliopterus and an undescribed extinct species from the upper Miocene Solimões Formation, Acre, Brazil. New diagnostic characters of Phractocephalus are presented that apply to the modern and fossil species, including: 1 ornamentation of skull, pectoral girdle and fin spines comprising a coarse meshwork of reticulating ridges surrounding rounded pits plus some elongate ridges and sulci; 2 supraoccipital posterior process greatly expanded laterally and posteriorly behind occipital wall; 3 lateral ethmoid and sphenotic broadly sutured behind eye; 4 anterior cranial fontanelle reduced or completely closed and posterior cranial fontanelle closed; 5 vomerine tooth plate large, roughly pentagonal to triangular in form, and with fine teeth. Today Phractocephalus ranges widely throughout the lowland Orinoco, Amazon and Essequibo basins. However, the genus does not occur west or north of the Andes or Venezuelan coastal ranges. Recognizing the Urumaco Phractocephalus as a distinct species does not alter the obvious conclusion that this catfish marks a large river connection between the Caribbean coastal region and the Orinoco system during at least part of the Neogene. Other Urumaco fossils show this same biogeographic relationship.

  16. Morphological development of Corydoras aff. paleatus (Siluriformes, Callichthyidae and correlation with the emergence of motor and social behaviors

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    Daniel Rodríguez-Ithurralde

    2014-06-01

    Full Text Available Here we examine major anatomical characteristics of Corydoras aff. paleatus (Jenyns, 1842 post-hatching development, in parallel with its neurobehavioral evolution. Eleutheroembryonic phase, 4.3-8.8 days post-fertilization (dpf; 4.3-6.4 mm standard length (SL encompasses from hatching to transition to exogenous feeding. Protopterygiolarval phase (8.9-10.9 dpf; 6.5-6.7 mm SL goes from feeding transition to the commencement of unpaired fin differentiation, which marks the start of pterygiolarval phase (11-33 dpf; 6.8-10.7 mm SL defined by appearance of lepidotrichia in the dorsal part of the median finfold. This phase ends with the full detachment and differentiation of unpaired fins, events signaling the commencement of the juvenile period (34-60 dpf; 10.8-18.0 mm SL. Eleutheroembryonic phase focuses on hiding and differentiation of mechanosensory, chemosensory and central neural systems, crucial for supplying the larval period with efficient escape and nutrient detection-capture neurocircuits. Protopterygiolarval priorities include visual development and respiratory, digestive and hydrodynamic efficiencies. Pterygiolarval priorities change towards higher swimming efficacy, including carangiform and vertical swimming, necessary for the high social interaction typical of this species. At the end of the protopterygiolarval phase, simple resting and foraging aggregations are seen. Resting and foraging shoals grow in complexity and participant number during pterygiolarval phase, but particularly during juvenile period.

  17. Two new species and one new subspecies of the South American catfish genus Corydoras (Pisces, Siluriformes, Callichthyidae)

    NARCIS (Netherlands)

    Nijssen, H.

    1971-01-01

    This paper contains descriptions and figures of two new species of Corydoras Lacépède, 1803, C. weitzmani from Peru, and C. blochi from Guyana, Brazil, and Venezuela. The latter species is represented by two subspecies, C. blochi blochi from the Amazonas, Branco, Orinoco, and Essequibo drainages,

  18. Embryonic development and larval stages of Steindachneridion parahybae (Siluriformes: Pimelodidae: implications for the conservation and rearing of this endangered Neotropical species

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    Renato M. Honji

    2012-01-01

    Full Text Available Steindachneridion parahybae is a freshwater catfish endemic to the Paraíba do Sul River and is classified as an endangered Neotropical species. An increasing number of conservation biologists are incorporating morphological and physiological research data to help conservation managers in rescue these endangered species. This study investigated the embryonic and larval development of S. parahybae in captivity, with emphasis in major events during the ontogeny of S. parahybae. Broodstocks were artificially induced to reproduce, and the extrusion occurred 200-255 degree-hours after hormonal induction at 24°C. Larval ontogeny was evaluated every 10 minutes under microscopic/stereomicroscopic using fresh eggs samples. The main embryogenic development stages were identified: zygote, cleavage, including the morula, blastula, gastrula phase, organogenesis, and hatching. The extruded oocytes showed an average diameter of 1.10 ± 0.10 mm, and after fertilization and hydration of eggs, the average diameter of eggs increased to about 1.90 ± 0.60 mm, characterized by a large perivitelline space that persisted up to embryo development, the double chorion, and the poles (animal and vegetative. Cell division started about 2 minutes after fertilization (AF, resulting in 2, 4, 8 (4 x 2 arrangement of cells, 16 (4 x 4, 32 (4 x 8 and 64 (2 x 4 x 8 cells. Furthermore, the blastula and gastrula stages followed after these cells divisions. The closed blastopore occurred at 11 h 20 min AF; following the development, the organogenetic stages were identified and subdivided respectively in: early segmentation phase and late segmentation phase. In the early segmentation phase, there was the establishment of the embryonic axis, and it was possible to distinguish between the cephalic and caudal regions; somites, and the optic vesicles developed about 20 h AF. Total hatching occurred at 54 h AF, and the larvae average length was 4.30 ± 0.70 mm. Gradual yolk sac reduction was observed during the first two days of larval development. The first feeding occurred at the end of the second day. During the larval phase, cannibalism, heterogeneous larval growth and photophobia were also observed. This information will be important in improving the artificial reproduction protocols of S. parahybae in controlled breeding programs.Steindachneridion parahybae é um bagre de água doce, endêmico do rio Paraíba do Sul e é classificado como espécie neotropical ameaçada. Um número crescente de biólogos conservacionistas estão incorporando dados de pesquisas morfológicas e fisiológicas para ajudar os gestores de conservação no resgate destas espécies ameaçadas de extinção. Este estudo investigou o desenvolvimento embrionário e larval de S. parahybae em cativeiro, com ênfase nos principais eventos durante a ontogenia de S. parahybae. Reprodutores foram artificialmente induzidos à reprodução e a extrusão ocorreu com 200-255 horas-graus após a indução hormonal a 24°C. A ontogenia larval foi avaliada a cada 10 minutos sob microscópio/ estereomicroscópio, utilizando-se amostras de ovos recém coletados. Os principais estágios de desenvolvimento embrionário foram identificados: zigoto, clivagem, incluindo as fases, mórula, blástula e gástrula, organogênese e eclosão. Os ovócitos extrusados apresentaram uma média de diâmetro de 1,10 ± 0,10 mm e depois da fertilização e hidratação dos ovos, a média de diâmetro dos ovos aumentou para 1,90 ± 0,60 mm, caracterizado pelo grande espaço vitelínico que persistiu até o desenvolvimento do embrião, duplo córion e os polos (animal e vegetal. A divisão celular iniciou-se aproximadamente dois minutos após a fertilização (AF, resultando em 2, 4, 8 (4 x 2 arranjo das células, 16 (4 x 4, 32 (4 x 8 e 64 (2 x 4 x 8 células. Adicionalmente, seguiram as fases de blástula e gástrula depois das divisões celulares. O fechamento do blastóporo ocorreu às 11 h 20 min AF; seguindo o desenvolvimento, os estágios de organogênese foram identificados e subdivididos, respectivamente em: fase de divisão inicial e fase de divisão avançada. Na fase de divisão inicial, depois do estabelecimento do eixo do embrião, foi possível distinguir as regiões cefálica e caudal; os somitos e as vesículas ópticas se desenvolveram com aproximadamente 20 h AF. A eclosão total ocorreu com cerca de 54 h AF e o comprimento médio foi de 4,30 ± 0,70 mm. A redução gradual do saco vitelínico foi observada durante os primeiros dois dias de desenvolvimento larval. A primeira alimentação ocorreu no final do segundo dia. Durante a fase larval, canibalismo, crescimento larval heterogêneo e fotofobia também foram observados. Estas informações serão importantes para aperfeiçoar o protocolo de reprodução artificial em S. parahybae em programas de reprodução controlada.

  19. Ultrastructural particularities of the spermatozoon of the cestode Electrotaenia malopteruri (Fritsch, 1886) (Proteocephalidae: Gangesiinae), a parasite of Malapterurus electricus (Siluriformes: Malapteruridae) from the river Nile, Egypt

    Czech Academy of Sciences Publication Activity Database

    Bruňanská, Magdaléna; Scholz, Tomáš; Ibraheem, M. H.

    2004-01-01

    Roč. 93, č. 2 (2004), s. 114-120 ISSN 0932-0113 R&D Projects: GA ČR GA524/04/0342; GA ČR GA206/03/1317 Grant - others:GA SR(SK) VEGA2/1020/21 Institutional research plan: CEZ:AV0Z6022909 Keywords : Cestoda * Proteocephalidea * spermatozoon Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 1.060, year: 2004

  20. Genetic evidence for two species of the genus Pimelodus Lacépède, 1803 (Siluriformes, Pimelodidae in the Iguaçu River (Brazil

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    Renesto Erasmo

    2000-01-01

    Full Text Available The existence of reproductive isolation between two morphs of catfish, endemic to the Iguaçu River (Brazil, was examined by enzyme starch gel electrophoresis. Tissues of 19 catfish (Pimelodus ortmanni and 15 of a similar morph (Pimelodus sp., which differs from P. ortmanni by presenting larger and more scattered dusky spots on its skin, were analyzed. A Nei's (1978 genetic identity of 0.551 was determined by the analysis of 22 enzyme loci. The loci EST*1, EST*2, GDH*1, GPI*1, GPI*2, IDH*1, MDH*1, MDH*2, and PGM*1 were fixed for different alleles in each morph, that is, no heterozygote was found for these loci. The enzymatic patterns observed for the two morphs indicate both that the taxa are reproductively isolated and that they in fact represent separate species.

  1. Spinitectus aguapeiensis n. sp (Nematoda: Cystidicolidae) from Pimelodella avanhandavae Eigenmann (Siluriformes: Heptapteridae) in the River Aguapei, Upper Parana River Basin, Brazil

    Czech Academy of Sciences Publication Activity Database

    Acosta, A.A.; González-Solís, David; Da Silva, R.J.

    2017-01-01

    Roč. 94, č. 6 (2017), s. 649-656 ISSN 0165-5752 R&D Projects: GA ČR(CZ) GBP505/12/G112 Institutional support: RVO:60077344 Keywords : fresh-water fish * southern Mexico * intestine * osorioi * Chiapas Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine OBOR OECD: Veterinary science Impact factor: 1.181, year: 2016

  2. A new species of Trichogenes from the rio Itapemirim drainage, southeastern Brazil, with comments on the monophyly of the genus (Siluriformes: Trichomycteridae

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    Mário C. C. de Pinna

    Full Text Available A new species of the formerly monotypic genus Trichogenes is described from a high-altitude stream of the rio Itapemirim system, an isolated Atlantic drainage in the State of Espírito Santo, southeastern Brazil. Trichogenes claviger, new species, differs from all other trichomycterids by the sexually dimorphic posterior process of the opercle, much elongated in males; the terminal mouth; the deeply bifurcated anterior neural spines and the presence of a large anterodorsal claw-like process on the neural arches of the anterior four free vertebrae. The new species also differs from its only congener, T. longipinnis, by a number of additional traits, including the the lack of branched anal-fin rays in specimens of any size; the broader than long posterior nostril; the deeper head (head depth 72.9-86.6% HL; the presence of a fine dark line along the base of the anal fin; the lack of dark spots on cheeks; the shape of the interopercle; the presence of odontodes on a bony expansion on the posterodorsal margin of the interopercle; the fewer vertebrae (35; the absence of an antorbital; and the fewer pleural ribs (eight. Small juveniles of the new species are also strikingly different from those of all other Trichomycteridae, including T. longipinnis, having a very large lateral eye, an upturned mouth, and compressed head. Trichogenes claviger occurs in shaded sectors of a blackwater sluggish stream with sandy substrate and patchy accumulations of vegetable debris, a habitat markedly different from the rocky torrential environment known for T. longipinnis. A comparison of the internal anatomy of the two species provides the basis for a hypothesis of a monophyletic Trichogenes. Data from the new species further support a sister-group relationship between Trichogeninae and Copionodontinae, as well as the position of that clade as sister group to all remaining Trichomycteridae.

  3. Pseudobunocephalus, a new genus of banjo catfish with the description of a new species from the Orinoco River system of Colombia and Venezuela (Siluriformes: Aspredinidae

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    John P. Friel

    Full Text Available Pseudobunocephalus, a new genus of small banjo catfishes (< 80 mm SL, is distinguished from all other aspredinid genera by the following unique features: mandibular teeth restricted to a patch near symphysis of lower jaw; no contact between the metapterygoid and quadrate; autopalatine posteriorly forked with two separate cartilages; absence of the fourth pharyngobranchial; absence of gill rakers on all branchial arches; and lack of bifid hemal spines on vertebrae that articulate with anal-fin pterygiophores. As defined Pseudobunocephalus contain a new species, P. lundbergi from the Orinoco River basin, along with five other species previously assigned to the genus Bunocephalus: P. amazonicus, P. bifidus, P. iheringii, P. quadriradiatus, and P. rugosus.

  4. A new species of Glaphyropoma: the first subterranean copionodontine catfish and the first occurrence of opercular odontodes in the subfamily (Siluriformes: Trichomycteridae

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    Maria Elina Bichuette

    Full Text Available A new species of the rare copionodontine genus Glaphyropoma is described from subterranean waters in the Diamantina Plateau, Bahia State, central northeastern Brazil. This is the first troglomorphic species in the subfamily Copionodontinae. It is distinguished from all other copionodontines by the presence of opercular odontodes, and further distinguished from its only congener, G. rodriguesi, by the reduction of dark integumentary pigmentation. The new species shares the single synapomorphy previously proposed for Glaphyropoma, the marked narrowing of the first hypobranchial and indirect character evidence also supports its inclusion in the genus. The presence of opercular odontodes in the new species, in combination with a reviewed hypothesis of sister group relationship between Copionodontinae and Trichogeninae, indicate that the absence of opercular odontodes in previously-known copionodontines is secondary, rather than primitive.

  5. A new species of Pimelodus LaCépède, 1803 (Siluriformes: Pimelodidae from the rio São Francisco drainage, Brazil

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    Frank Raynner V. Ribeiro

    Full Text Available Pimelodus pohli, new species, is described from the rio São Francisco drainage. It differs from congeners by the following characters in combination: adults with dark spots on anterodorsal region of body and young specimens (up to 100 mm SL with three rows of dark spots laterally on body; comparatively long adipose fin, more than one third of the distance between posterior end of dorsal fin base and the vertical through posterior end of anal-fin base (21.8-26.2% SL; lips poorly developed; 20-25 gill rakers; and maxillary barbels slightly surpassing the caudal-fin base. A key to the species of Pimelodus of the rio São Francisco drainage is presented.

  6. Ecomorphology and diet reflect the spatial segregation between two Siluriformes species inhabiting a stream of the Bodoquena Plateau, in Central Brazil

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    Francisco Severo-Neto

    2015-03-01

    Full Text Available Pimelodella taenioptera Miranda Ribeiro, 1914 and Imparfinis schubarti (Gomes, 1956 are two of the most common fish species in Bodoquena Plateau streams, Paraguay basin. These species have benthic habits and subaquatical observations suggested that they present differentiation in their preference for mesohabitat types. Pimelodella taenioptera shows preference for slow waters, such as pools, while I. schubarti is associated to riffles. In this study we investigated if the known patterns of mesohabitat use of P. taenioptera and I. schubarti can be predict by their ecomorphological and trophic traits. We described the dietary habits and ecomorphological attributes of P. taenioptera and I. schubarti individuals, captured in the Parque Nacional da Serra da Bodoquena (PNSB, Mato Grosso do Sul state, central Brazil. Pimelodella taenioptera presented a more generalist diet, consuming a total of 23 different food items. Imparfinis schubarti have a diet based exclusively on aquatic insects. The ecomorphological analysis revealed that the species differed in relation to five morphological traits associated to habitat use (p <0.01. The results of this study reveal a clear functional dissimilarity between P. taenioptera and I. shubarti. The observed trophic and ecomorphological patterns are congruent with the known habitat use for these species and probably reflect the spatial and temporal variability on conditions and resources present in riffles and pools. Therefore, as expected, the morphological and feeding attributes represent predictive information related to mesohabitat use.

  7. Reappraisal of Rhamdia branneri Haseman, 1911 and R. voulezi Haseman, 1911 (Siluriformes: Heptapteridae from the rio Iguaçu with notes on their morphometry and karyotype

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    Julio Cesar Garavello

    Full Text Available ABSTRACT The species Rhamdia branneri Haseman, 1911 and the subspecies Rhamdia branneri voulezi Haseman, 1911 from rio Iguaçu are currently recognized as synonyms of Rhamdia quelen (Quoy & Gaimard, 1824. However, recent karyotype and ecomorphology studies distinguish R. branneri and R. voulezi as different species. Examination of Rhamdia populations from rio Iguaçu, including type specimens, together with other congeners from rio Tibagi, allowed to properly reexamine the situation of these Haseman's taxa and references given to Rhamdia in the Iguaçu. The species R. branneri and R. voulezi have strong serrae with large basis on both margins of the pectoral-fin spine, uncommon in the remaining species of Rhamdia and different from the fine serrate margins of the pectoral spine of R. quelen ; a regular dorsal profile, slightly curved between supraoccipital and dorsal fin; with dorsal dark-brown or light-gray coloration along body, abdomen pale, without profuse small black spots, common in populations of the upper Paraná species and the type-material of R. quelen . Also the following morphometric characters discriminate these species: Rhamdia voulezi , adipose fin elongate; smaller distance between dorsal and adipose fin; smaller length between adipose fin to base of caudal fin and smaller distance from posterior margin of eye to opercular border. Rhamdia branneri , larger distance from dorsal and adipose fins; deeper caudal peduncle; higher trunk depth in the vertical distance through adipose, between pelvic and anal fins; larger scapular bridge; shorter maxillary barbel; shorter external mental barbel; shorter interorbital distance; shorter length of dorsal fin basis and shorter adipose-fin base length. A PCA between the populations of Rhamdia from Iguaçu and a population from rio Tibagi, upper Paraná basin, discriminates the population from Tibagi on basis of dorsal to adipose fin distance, dorsal-fin spine length, maxillary barbel length, eye diameter, and pectoral-fin spine length. This morphometric study allied to the karyotype known differences suggest R. branneri and R. voulezi as valid species. The complex state of R. quelen with the neotype recently designated from rio Samiria recommend new studies on basis of molecular genetics and provision of the names R. branneri and R. voulezi in the Iguaçu basin.

  8. Estrutura populacional e aspectos reprodutivos de Corydoras aeneus (Siluriformes, Callichthyidae em riachos da bacia do rio Ivinhema, Alto rio Paraná

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    Fabiane S. Ferreira

    2015-12-01

    Full Text Available RESUMO Apesar do crescente número de estudos sobre biologia de espécies de peixes de pequeno porte, o conhecimento dos aspectos básicos da biologia da maioria das espécies ainda é incipiente. Com isso, o objetivo desse estudo foi descrever alguns aspectos populacionais e reprodutivos de Corydoras aeneus (Gill, 1858 em riachos da bacia do rio Ivinhema, Alto rio Paraná. As amostragens foram realizadas entre 2008 e 2011 em 57 riachos distribuídos na bacia. Foram analisados 684 indivíduos, sendo 213 fêmeas e 190 machos, além de 281 exemplares analisados apenas quanto aos dados de comprimento padrão. O comprimento padrão máximo da população analisada foi de 50,19 mm para as fêmeas e de 45,24 mm para machos; Desta forma, as fêmeas foram maiores que os machos. A proporção sexual foi de 52,7% para fêmeas e de 47,1% para os machos, sem variação significativa entre os sexos (Χ2= 1,313; p = 0,252. Quanto à relação peso/comprimento ambos os sexos apresentaram a crescimento isométrico. As maiores frequências de fêmeas maduras foram observadas nos meses de outubro a dezembro, embora tenham sido observadas fêmeas maduras em outros meses do ano. Estimou-se que 50% das fêmeas estão sexualmente maduras com 33,54 mm de comprimento padrão. A fecundidade média foi estimada em 359,47 oócitos, sendo que a população apresenta desova total. O padrão de recrutamento não apresentou um padrão unimodal, embora a maior intensidade tenha sido observada nos meses de outubro a dezembro. O comprimento assintótico foi estimado em 54,59 mm e a taxa de crescimento de 1,1 ano-1. O índice de performance de crescimento foi estimado em 3,51; a longevidade de 2,72 anos e a mortalidade de 1,48 ano-1.

  9. Glutathione S-Transferase as biomarker in Sciades herzbergii (Siluriformes: Ariidae for environmental monitoring: the case study of São Marcos Bay, Maranhão, Brazil

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    Raimunda N.F Carvalho-Neta

    2013-04-01

    Full Text Available The Glutathione S-Transferase (GST activity has been proposed as a biomarker of susceptibility to the presence of potentially damaging xenobiotics in aquatic organisms. The aim of this work was to measure GST activity in the liver of Sciades herzbergii (catfish in order to evaluate the biochemical effects of pollutants. The catfish samples were collected along known pollution gradients areas (A1 and from areas regarded as relatively free of anthropogenic input (A2, in São Marcos Bay, São Luis de Maranhão, Brazil. The variables analyzed in fish were: length, weight, gonadal stages, gonadosomatic index and GST activity. The databases from this analysis were compiled, and generalized linear models were used to analyze the dependence of enzyme activity on the areas of sampling and on selected biological parameters of fish. A significant difference was observed in GST activity in the liver of S. herzbergii in the comparison between fish from the contaminated site and those from the reference site (P < 0.05. Morphometric (length and weight parameters and gonadosomatic index of collected fish were significant in the linear model of GST activity only in the reference site. These results may be due to the activity pattern of the enzyme, which increases with the sexual maturity of the animals in healthy environments. In the contaminated area (A1 these correlations do not exist, probably as a result of the energy used in the biotransformation of the various contaminants.

  10. Variação temporal e espacial na dieta de Trachelyopterus galeatus (Siluriformes, Auchenipteridae em dois reservatórios no semiárido Neotropical

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    José I. M. Sousa

    2017-11-01

    Full Text Available RESUMO Alimentação de peixes propicia dados para discussão de aspectos teóricos atendendo a propósitos como o conhecimento básico da biologia de uma determinada espécie através do entendimento da organização trófica em um determinado ambiente. Assim, objetivou-se analisar a composição alimentar e a morfologia, associadas ao hábito alimentar de Trachelyopterus galeatus (Linnaeus, 1766 e avaliar as alterações da dieta ao longo do tempo. As coletas dos indivíduos ocorreram trimestralmente, durante os meses de fevereiro, maio, agosto e novembro de 2013, por meio de redes de esperas com diferentes malhas distribuídas em oito pontos no reservatório de Santa Cruz e em cinco pontos no reservatório de Umari, ambos localizados no Rio Grande do Norte. Dos itens identificados da dieta foram obtidas as frequências de ocorrência e volumétrica, combinadas no cálculo de Índice Alimentar (IAi. Os volumes dos itens foram ordenados em NMDS e as suas diferenças testadas em PERMANOVA, a contribuição de cada item alimentar para as diferenças entre os reservatórios foi avaliada através da análise SIMPER. As análises dos conteúdos alimentares permitiram a classificação da espécie como carnívora, constatando-se significativas alterações temporais em sua dieta, com as características morfológicas em conformidade ao consumo dos itens alimentares.

  11. Temporal and spatial distribution of young Brachyplatystoma spp. (Siluriformes: Pimelodidae) along the rapids stretch of the Madeira River (Brazil) before the construction of two hydroelectric dams.

    Science.gov (United States)

    Cella-Ribeiro, A; Assakawa, L F; Torrente-Vilara, G; Zuanon, J; Leite, R G; Doria, C; Duponchelle, F

    2015-04-01

    Monthly (April 2009 to May 2010) bottom-trawl sampling for Brachyplatystoma species along the rapids stretch of the Madeira River in Brazil revealed that Brachyplatystoma rousseauxii larvae and juveniles were present in low abundances in all areas and during all hydrological periods. The presence of larvae and juveniles throughout the hydrological cycle suggests asynchronous spawning in the headwaters of the Madeira River. © 2015 The Fisheries Society of the British Isles.

  12. Revision of the species of the genus Cathorops (Siluriformes: Ariidae from Mesoamerica and the Central American Caribbean, with description of three new species

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    Alexandre P. Marceniuk

    Full Text Available The ariid genus Cathorops includes species that occur mainly in estuarine and freshwater habitats of the eastern and western coasts of southern Mexico, Central and South America. The species of Cathorops from the Mesoamerica (Atlantic slope and Caribbean Central America are revised, and three new species are described: C. belizensis from mangrove areas in Belize; C. higuchii from shallow coastal areas and coastal rivers in the Central American Caribbean, from Honduras to Panama; and C. kailolae from río Usumacinta and lago Izabal basins in Mexico and Guatemala. Additionally, C. aguadulce, from the río Papaloapan basin in Mexico, and C. melanopus from the río Motagua basin in Guatemala and Honduras, are redescribed and their geographic distributions are revised.

  13. Taxonomic revision and phylogenetic relationships of Dasyloricaria Isbrücker & Nijssen, 1979 (Siluriformes: Loricariidae, with description of a new species

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    Alejandro Londoño-Burbano

    Full Text Available ABSTRACT A taxonomic revision and phylogenetic analysis were completed for Dasyloricaria . The genus includes three valid species: D . filamentosa and D . latiura previously included in the genus, and a new species described herein. Dasyloricaria have a restricted trans-Andean distribution, with D . filamentosa occurring at the lower and middle Magdalena, lower Cauca, and Sinu in Colombia, and lago Maracaibo basin in Colombia and Venezuela; D . latiura in the Atrato and the Tuyra basins in Colombia and Panama, respectively; and the new species in the upper and middle Magdalena basin in Colombia. New synonyms for D . filamentosa and D . latiura are proposed, and a lectotype is designated for the latter. Dasyloricaria is herein recognized as monophyletic, with D . filamentosa as the sister group of D . latiura , and the new speciesas sister to that clade. Spatuloricaria is hypothesized to be the sister group of Dasyloricaria based on synapomorphies of the neurocranium, branchial arches and external morphology features. The subtribe Rineloricariina was partially corroborated through the phylogenetic analysis. An identification key for the species of Dasyloricaria is provided.

  14. Cytogenetics of the Porthole Shovelnose Catfish, Hemisorubim platyrhynchos (Valenciennes, 1840) (Siluriformes, Pimelodidae), a widespread species in South American rivers

    Science.gov (United States)

    Swarça, Ana Cláudia; Sanchez, Sebastian; Dias, Ana Lucia; Fenocchio, Alberto Sergio

    2013-01-01

    Abstract Hemisorubim platyrhynchos is a medium- to large-sized pimelodid catfish distributed along several river basins of the Neotropical Region, noteworthy for representing an important fishery source. In this work, Hemisorubim platyrhynchos from three isolated populations were cytogenetically analyzed. The karyotype shows a diploid number of 2n=56 chromosomes comprising 22m, 16sm, 10st, 8a (FN=104). NORs detected by AgNO3 were located in the terminal regions of the short arm of a st chromosome pair, as confirmed by CMA3 and FISH using an 18S rDNA probe. C-banding revealed a small amount of heterochromatin in chromosomes, including the NORs, and one biarmed pair that showed conspicuous positive bands on both arms. This fact was also evidenced when using other banding techniques, such as RE (AluI), and indicates that this pair constitutes a species-specific cytogenetic marker. PMID:24260693

  15. Larvae occurrences of Rhamdia quelen (Quoy & Gaimard, 1824 (Siluriformes: Heptapteridae in an area under dam influence in the upper Paraná River region, Brazil

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    Evelyn B. da Silva

    Full Text Available Rhamdia quelen (Jundiá is a catfish species of great interest to fish producers and researchers due to several favorable characteristics for inclusion in the Brazilian list of commercially raised fish. It has a wide geographical distribution, with occurrences reported from Central Argentina to South Mexico. Studies on the biological aspects of this species have been limited to captive adult fishes that were researched for farming purposes. Research related to ichthyoplankton has provided valuable information on spawning periods and sites and other aspects of breeding for numerous species of fish. This information is crucial for implementing management and protection strategies for these species. The studied floodplain is located in a lotic remnant between the Reservoirs of Itaipu and Engenheiro Sérgio Motta. This area is located inside a protected area (Ilha Grande National Park in the last portion of dam-free land along the Paraná River in the Brazilian territory; however, it is still threatened by the negative effects of the dams. We conducted monthly nocturnal collections during four periods from October to March, 2003 to 2007, in 22 locations along the main channel, secondary lakes and main tributaries of the Paraná River. After collection, the individuals were classified according to the degree of development and the notochord flexion and caudal fin support elements. Data were analyzed using principal component analysis (PCA, ANOVA and Pearson correlation to relate abiotic and larval density data. The increase of capture abundances in the four studied stages suggests that R. quelen is finding conditions that are favorable to its reproduction. The increase in captures can generate questions regarding R. quelen reproductive activity, for instance, whether the species is adapting or is influenced by environmental changes created by the Paraná River dams.

  16. A new species of Corydoras Lacépède (Siluriformes: Callichthyidae from the Rio Tapajós basin and its phylogenetic implications

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    Vinicius C. Espíndola

    2014-01-01

    Full Text Available A new species of Corydoras is described from tributaries of the rio Arinos, rio Teles Pires and rio Preto, all in the rio Tapajós basin. The new species is a member of a group that includes 36 species with spots on the body. Within this group, the new species can be readily distinguished by having a smaller dorsal-fin spine than the first three subsequent soft dorsal-fin rays; pectoral, pelvic and anal fins hyaline; dorsal-fin interradial membrane hyaline; rounded spots on trunk restricted to dorsolateral body plates and dorsal portion of ventrolateral body plates, not reaching the base of pelvic and anal fins. The new species can be further distinguished from Corydoras xinguensis by having spots with diffuse edges, and from all other species of spotted Corydoras except C.multimaculatus, by the absence of ventral platelets. A phylogenetic analysis recovered the new species plus Corydoras metae and C.araguaiensis in a clade sharing the presence of a pointed process on the maxilla for insertion of the retractor tentaculi muscle. In addition, the presence in the new species of an elongated anterior portion of the mesethmoid and a triangular uncinate process of the epibranchial 3 suggests a close relationship with Corydoras metae.

  17. Karyotype characterization and ZZ/ZW sex chromosome heteromorphism in two species of the catfish genus Ancistrus Kner, 1854 (Siluriformes: Loricariidae from the Amazon basin

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    Renildo R. de Oliveira

    Full Text Available We present karyotypic characteristics and report on the occurrence of ZZ/ZW sex chromosomes in Ancistrus ranunculus (rio Xingu and Ancistrus sp. "Piagaçu" (rio Purus, of the Brazilian Amazon. Ancistrus ranunculus has a modal number of 2n=48 chromosomes, a fundamental number (FN of 82 for both sexes, and the karyotypic formula was 20m+8sm+6st+14a for males and 19m+9sm+6st+14a for females. Ancistrus sp. "Piagaçu" presented 2n=52 chromosomes, FN= 78 for males and FN= 79 for females. The karyotypic formula was 16m+8sm+2st+26a for males and 16m+9sm+2st+25a for females. The high number of acrocentric chromosomes in karyotype of Ancistrus sp. "Piagaçu" differs from the majority of Ancistrini genera studied so far, and may have resulted from pericentric inversions and translocations. The lower number of chromosomes in A. ranunculus indicates that centric fusions also occurred in the evolution of Ancistrus karyotypes. We conclude that karyotypic characteristics and the presence of sex chromosomes can constitute important cytotaxonomic markers to identify cryptic species of Ancistrus. However, sex chromosomes apparently arose independently within the genus and thus do not constitute a reliable character to analyze phylogenetic relations among Ancistrus species.

  18. Phenotypic Diversities of Four Populations of Clarias Gariepinus (Siluriformes, Clariidae Obtained from Ogun and Ondo State Waterbodies in South-Western Nigeria

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    Ola-Oladimeji F. A.

    2017-08-01

    Full Text Available The study determined the variation in the morphological and meristic features among four populations of Clarias gariepinus Burchell, 1822 obtained from Owena Dam and River Oluwa in Ondo State and Rivers Omo and Ogbere in Ogun State, both in Nigeria. A total of ninety five (95 and one hundred and twenty (120 fish specimens collected from Ondo and Ogun states respectively were measured using standard procedures and the results were analysed using Analysis of variance and multivariate analyses. The results obtained from the ANOVA and Principal Component Analyses of Clarias gariepinus from the four populations revealed heterogeneity for most of their characters. Therefore, the morphological differences between the wild African catfish found in Ondo and Ogun state populations could be linked to genetic differences or environmental factors or a combination of both factors. Hence, this study concluded that the populations are different which could imply high genetic diversity if molecular marker techniques are employed in further studies.

  19. Reappraisal of Goezeella Fuhrmann, 1916 (Cestoda: Proteocephalidae), parasites of Neotropical catfi shes (Siluriformes), with description of a new species from Pimelodella cristata (Heptapteridae)

    Czech Academy of Sciences Publication Activity Database

    Alves, Philippe Vieira; de Chambrier, A.; Luque, J.L.; Scholz, Tomáš

    19 June, č. 124 (2017), s. 335-350 ISSN 0035-418X R&D Projects: GA ČR(CZ) GBP505/12/G112 Institutional support: RVO:60077344 Keywords : morphology * taxonomy * tapeworms * Onchoproteocephalidea * systematics * host-associations * Neotropical Region * South America Subject RIV: EG - Zoology OBOR OECD: Zoology Impact factor: 0.380, year: 2016

  20. A new species of Hypostomus Lacépède, 1803 (Siluriformes: Loricariidae from the upper rio Paraná basin, Southern Brazil

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    Fernando C. Jerep

    Full Text Available A new species of Hypostomus with large and spaced light roundish spots is described from the upper rio Paraná basin. Hypostomus multidens new species is distinguished from all remaining congeners with light spots on a darker background by two independent characters: the presence of teeth with two symmetrical cusps, and a high tooth number in each dentary (122267, mean 196.8 and premaxilla (115-260, mean 190.8.

  1. Biochemical comparison of two Hypostomus populations (Siluriformes, Loricariidae from the Atlântico Stream of the upper Paraná River basin, Brazil

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    Kennya F. Ito

    2009-01-01

    Full Text Available Two syntopic morphotypes of the genus Hypostomus - H. nigromaculatus and H. cf. nigromaculatus (Atlântico Stream, Paraná State - were compared through the allozyme electrophoresis technique. Twelve enzymatic systems (AAT, ADH, EST, GCDH, G3PDH, GPI, IDH, LDH, MDH, ME, PGM and SOD were analyzed, attributing the score of 20 loci, with a total of 30 alleles. Six loci were diagnostic (Aat-2, Gcdh-1, Gpi-A, Idh-1, Ldh-A and Mdh-A, indicating the presence of interjacent reproductive isolation. The occurrence of few polymorphic loci acknowledge two morphotypes, with heterozygosity values He = 0.0291 for H. nigromaculatus and He = 0.0346 for H. cf. nigromaculatus. F IS statistics demonstrated fixation of the alleles in the two morphotypes. Genetic identity (I and distance (D of Nei (1978 values were I = 0.6515 and D = 0.4285. The data indicate that these two morphotypes from the Atlântico Stream belong to different species.

  2. Population structure and somatic indexes of Hypostomus cf. ancistroides (Siluriformes, Loricariidae collected from the Bonito river, Ivaí river basin, Turvo, Paraná

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    Douglas Viana

    2008-06-01

    Full Text Available This study aimed to provide information about the population structure and somatic index of Hypostomus cf. ancistroides collected from the Bonito river, located in the Ivaí river basin. The length-weight relationship was isometric for both the sexes. The length structure analysis showed that the larger individuals (from 18.1cm to 27.0cm in length predominated, and the lowest abundances occurred at the size extremes (9.1-12cm and 27.1-30.0cm. The reproduction period occured between October and January for the females and between November and January for the males. The liver somatic index cannot be used as an indicator of the reproduction period in either of the sexes, due to no correlation between the liver somatic index and the gonad somatic index. The gonad weight exerted no influence on the monthly mean condition factor and the correlation between the condition factor and gonad somatic index was high. The condition factor could be an indicator of the reproduction period of this species.Este estudo teve o objetivo de fornecer informações sobre a estrutura populacional e os índices somáticos de Hipostomus cf. ancistroides coletados no rio Bonito localizado na bacia do rio Ivaí. A relação comprimento-peso, para machos e para fêmeas, foi isométrica. A análise da estrutura em comprimento mostrou que há um predomínio de indivíduos maiores (entre 18.1 a 27.0 cm sendo que as menores abundâncias ocorreram nas classes de comprimentos extremas (9.1 a 12.0 cm e 27.1 a 30.0 cm. O período reprodutivo em fêmeas ocorreu entre os meses de outubro a janeiro. Os machos possuem um período reprodutivo entre novembro e janeiro. O índice hepatossomático, para ambos os sexos, não pode ser utilizado como indicador do período reprodutivo, devido à não correlação entre o índice hepatossomático e o índice gonadossomático. O peso das gônadas não influenciou o valor médio do fator de condição e foi observada uma alta correlação entre o fator de condição e o índice gonadossomático. O fator de condição pode ser um indicador do período de reprodução desta espécie.

  3. Localization of 18S ribosomal genes in suckermouth armoured catfishes Loricariidae (Teleostei, Siluriformes with discussion on the Ag-NOR evolution

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    Anderson Alves

    2012-09-01

    Full Text Available The family Loricariidae with about 690 species divided into six subfamilies, is one of the world’s largest fish families. Cytogenetic studies conducted in the family showed that among 90 species analyzed the diploid number ranges from 2n=38 in Ancistrus sp. to 2n=96 in Hemipsilichthys gobio Luetken, 1874. In the present study, fluorescence in situ hybridization (FISH was employed to determine the chromosomal localization of the 18S rDNA gene in four suckermouth armoured catfishes: Kronichthys lacerta (Nichols, 1919, Pareiorhaphis splendens (Bizerril, 1995, Liposarcus multiradiatus (Hancock, 1828 and Hypostomus prope plecostomus (Linnaeus, 1758. All species analyzed showed one chromosome pair with 18S rDNA sequences, as observed in the previous Ag-NORs analyses. The presence of size and numerical polymorphism was observed and discussed, with proposing a hypothesis of the Ag-NOR evolution in Loricariidae.

  4. Karyotypic diversity and evolutionary trends in the Neotropical catfish genus Hypostomus Lacépède, 1803 (Teleostei, Siluriformes, Loricariidae

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    Anderson Alves

    2012-12-01

    Full Text Available The family Loricariidae with 813 nominal species is one of the largest fish families of the world. Hypostominae, its more complex subfamily, was recently divided into five tribes. The tribe Hypostomini is composed of a single genus, Hypostomus Lacépède, 1803, which exhibits the largest karyotypic diversity in the family Loricariidae. With the main objective of contributing to a better understanding of the relationship and the patterns of evolution among the karyotypes of Hypostomus species, cytogenetic studies were conducted in six species of the genus from Brazil and Venezuela. The results show a great chromosome variety with diploid numbers ranging from 2n=68 to 2n=76, with a clear predominance of acrocentric chromosomes. The Ag-NORs are located in terminal position in all species analyzed. Three species have single Ag-NORs (Hypostomus albopunctatus (Regan, 1908, H. prope plecostomus (Linnaeus, 1758, and H. prope paulinus (Ihering, 1905 and three have multiple Ag-NORs (H. ancistroides (Ihering, 1911, H. prope iheringi (Regan, 1908, and H. strigaticeps (Regan, 1908. In the process of karyotype evolution of the group, the main type of chromosome rearrangements was possibly centric fissions, which may have been facilitated by the putative tetraploid origin of Hypostomus species. The relationship between the karyotype changes and the evolution in the genus is discussed.

  5. Phylogeography of Hypostomus strigaticeps (Siluriformes: Loricariidae inferred by mitochondrial DNA reveals its distribution in the upper Paraná River basin

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    Rafael Splendore de Borba

    Full Text Available In this study, phylogenetic and phylogeographic analyses of populations identified as Hypostomus strigaticeps from the upper Paraná River basin were conducted in order to test whether these different populations comprises cryptic species or structured populations and to assess their genetic variability. The sequences of the mitochondrial DNA ATP sintetase (subunits 6/8 of 27 specimens from 10 populations (one from Mogi-Guaçu River, five from Paranapanema River, three from Tietê River and one from Peixe River were analyzed. The phylogeographic analysis showed the existence of eight haplotypes (A-H, and despite the ancestral haplotype includes only individuals from the Tietê River basin, the distribution of H. strigaticeps was not restricted to this basin. Haplotypes A, B and F were the most frequent. Haplotypes D, E, F, G, and H were present in the sub-basin of Paranapanema, two (A and B were present in the sub-basin of the Tietê River, one (C was exclusively distributed in the sub-basin of the Peixe River, and one (B was also present in the sub-basin of the Grande River. The phylogenetic analysis showed that the populations of H. strigaticeps indeed form a monophyletic unit comprising two lineages: TG, with representatives from the Tietê, Mogi-Guaçu and Peixe Rivers; and PP, with specimens from the Paranapanema River. The observed degree of genetic divergence within the TG and PP lineages was 0.1% and 0.2%, respectively, whereas the genetic divergence between the two lineages themselves was approximately 1%. The results of the phylogenetic analysis do not support the hypothesis of existence of crypt species and the phylogeographic analysis confirm the presence of H. strigaticeps in other sub-basins of the upper Paraná River: Grande, Peixe, and Paranapanema sub-basins.

  6. Additional new species of Hypostomus Lacépède, 1803, from Surinam; with remarks on the apparent „gymnorhynchus-complex” (Siluriformes, Loricariidae)

    NARCIS (Netherlands)

    Boeseman, M.

    1969-01-01

    Two new Surinam species of Hypostomus Lacépède are described, and their relationship is discussed; a group of three forms from eastern Surinam and (French) Guyane (gymnorhynchus-complex) is reconsidered; the species H. plecostomus (Linnaeus) is reported to hitherto survive in the lacustrine

  7. Different cytotypes in fishes of the genus Hypostomus Lcépède, 1803, (Siluriformes: Loricariidae from Xingu river (Amazon region, Brazil

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    Susana Milhomem

    2010-07-01

    Full Text Available We analyzed the karyotypes of three specimens of fishes of the genus Hypostomus Lacepede, 1803 (Loricaridae from Xingu River (Amazon region. We used conventional staining techniques, including C-banding, Ag-NOR staining, CMA3- and DAPI-banding. Each specimen had a different cytotype: Hypostomus sp. Xingu-1 had 2n=64 (32M/SM, 32ST/A; Hypostomus sp. Xingu-2 has 2n=66 (32M/SM, 34ST/A, and Hypostomus sp. Xingu-3 had 2n=65 (38M/SM, 26ST/A + 1 B. The three cytotypes showed similar C-, CMA3- and DAPI-banding patterns. The nucleolus organizing regions were located in the short arm of chromosome pair 25 of Hypostomus sp. Xingu-1 and pair 29 of Hypostomus sp. Xingu-2, and in the long arm of pair 30 of Hypostomus sp. Xingu-3, probably because of a pericentric inversion. A fusion/fission rearrangement explains the difference in the diploid number and number of M/SM and ST/A chromosomes between the 2n= 64 and 2n=66 cytotypes. The B chromosome most probably explains the difference between the 2n=64 and 2n=65 cytotypes. The cytotype with 2n=65 had a significantly larger number of M/SM chromosomes, probably because of pericentric inversions. These three cytotypes may represent different species.

  8. A new species of Hypostomus Lacépède, 1803 (Siluriformes: Loricariidae from the rio Tocantins-Araguaia basin, Brazil

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    Cláudio Henrique Zawadzki

    Full Text Available Hypostomus delimaiis described from the rio Tocantins, Tocantins State, and from the rio Araguaia, Pará, and Tocantins States, Brazil. The new species is distinguished from all other Hypostomusspecies, except from H. carinatus, H. hoplonites, and H. watwata, by the presence of five to eight (mode seven predorsal plates limiting posterior border of the supraoccipital bone (vs. one to three plates. It can be distinguished from H. carinatus, H. hoplonites, and H. watwata by having pale spots over darker background on body and fins (vs. dark spots over lighter background. The species was only found in the middle stretches of the rio Tocantins-Araguaia basin. The first collection of specimens assigned to the new species was done in the rio Tocantins before the construction of the Tucuruí dam. Recently additional material was collected in the rio Araguaia, in a habitat that soon will be flooded for the construction of the Santa Isabel hydroelectric power station.

  9. A new unicuspid-toothed species of HypostomusLacépède, 1803 (Siluriformes: Loricariidae from the rio Paraguai basin

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    Claudio H. Zawadzki

    Full Text Available A new unicuspid-toothed armored catfish species of Hypostomus is described from the Bodoquena Plateau, rio Paraguai basin, Mato Grosso do Sul State, Brazil. The new species is distinguished from its congeners, with exception of H. fonchii, by having unicuspid teeth (vs.bicuspid teeth; from H. fonchii it is distinguished by having median series of lateral plates with 26-27 (vs. 28; by lower number of premaxillary and dentary teeth (7-10 vs. 18-21; 8-13 vs. 18-25, respectively; for possessing more depressed head (head depth 15.8-18.1% SL vs. 19.1-22.0% SL; and by the presence of median buccal papilla (vs. absence.

  10. Two new species of the Hypostomus cochliodon group (Siluriformes: Loricariidae from the rio Paraguay basin, with a redescription of Hypostomus cochliodonKner, 1854

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    Luiz F. C. Tencatt

    Full Text Available Hypostomus cochliodon group is a monophyletic clade of 20 valid species of Neotropical armored catfishes that is widely distributed throughout South America. Recently, specimens identified as H. cochliodon from the type locality and nearby localities were examined, and found to include representatives of more than one species. A redescription of H. cochliodon is provided, with a description of two new species, one from the Bodoquena Plateau and another from several localities of the rio Paraguay basin. A lectotype for H. cochliodon is designated herein, since the previous designation is invalid. Hypostomus cochliodon is diagnosed from all other species of the H. cochliodon group by having the opercle almost completely covered laterally by thick layer of skin, the absence of buccal papilla, weak to moderately developed keels on the lateral plates of the body and by the color pattern of its body and fins. Hypostomus basilisko, new species, is distinguished from the remaining species of the H. cochliodon group by the absence of spots on the body, highly developed keels and spoon-shaped teeth. Hypostomus khimaera, new species, is distinguished from the other species of the H. cochliodon group by having a dark tan stripe along the midline of the flank, black spots on the body and/or fins and teeth with mesial cusp and not spoon-shaped.

  11. Characterization of 28S rRNA sequences of cestoda parasite Electrotaenia malapteruri Fritsch, 1886 from the Electric catfish Malapterurus electricus (Siluriformes: Malapteruridae).

    Science.gov (United States)

    Abdel-Gaber, Rewaida; Alajmi, Reem; Quraishy, Saleh Al; Morsy, Kareem; Rasheid, Khaled Al

    2018-07-01

    Proteocephalids are cestoda parasites that mostly infect freshwater fish. The present study was carried out to investigate the presence of proteocephalids infecting the electric catfish Malapterurus electricus from Lake Manzala, Kafr El-Sheikh Governorate, Egypt. Morphological characterization revealed the present parasite is a cestoda belonging to the genus Electrotaenia. Morphologically, the recovered worms were characterized by an elongated body measuring 100-127 (120 ± 2) mm long and 0.92-2.11 (2.76 ± 0.1) mm wide. The anterior part of the worm was obvious terminated at a spherical scolex measured 1.12-1.91 (1.72 ± 0.01) mm long and 1.12-1.65 (1.42 ± 0.01) mm wide with a rostellum-like apical organ equipped by 5-6 irregular rows of minute hooklets, as well as four uniloculate suckers with a diameter of 0.13-0.15 (0.14 ± 0.01) mm and covered with microtriches. A long unsegmented neck was observed followed by acraspedote and anapolytic strobila consisted of 85-120 proglottids divided into 50-58 immature, 12-19 mature, and up to 49 gravid proglottids. Molecular characterization based on 28S rRNA sequences was done to confirm the taxonomy of this parasite based on its morphology. It was observed that there was a close identity up to 72.0% with other protocephalid species obtained for comparison from the GenBank. Also, the data obtained revealed that there was high blast scores and low divergence between the present parasite and previously described Electrotaenia malapteruri (acc. no. JX477434). Phylogenetic analysis showed that the parasite sequence in conjunction with existing data investigates the placement of this protocephalid species within Proteocephalidea. It was shown that the present species is deeply embedded in the genus Electrotaenia with close relationships to other Electrotaenia malapteruri as a putative sister taxon. Copyright © 2018 Elsevier B.V. All rights reserved.

  12. Phylogeography of the Neotropical catfish Pimelodus albicans (Siluriformes: Pimelodidae from río de la Plata basin, South America, and conservation remarks

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    Julia Vergara

    Full Text Available Pimelodus albicans Valenciennes, 1840 (common name "moncholo" or "bagre blanco" is an endemic species of the family Pimelodidae in the río de la Plata basin. Phylogenetic approach based on cytochrome b sequences was performed to test the existence of a unique evolutionary lineage in P. albicans and to discriminate populations units or subpopulations related to a migration behavior of this taxon in the río de la Plata basin. This study included 34 samples of P. albicans of different collecting sites in the río de la Plata estuary and in the río Arrecifes belonging to the río Paraná basin. Among 614 base pairs in the cytochrome b sequence data set, 203 were variable and 120 were phylogenetically informative sites in P. albicans. A total of twenty haplotypes, nucleotide diversity (p = 0.032 and haplotype diversity = 0.941 were found. Tajima's test showed significant value D= -1.88 (p<0.05 rejecting the neutral mutation hypothesis for the P. albicans data set. All phylogenetic approaches showed that P. albicans included four monophyletic assemblages that were supported by high bootstrap and Bayesian posterior probability values. Minimum spanning network corroborated these groups for P. albicans haplotypes. High genetic structure was found in P. albicans by means of AMOVA analysis showing that the río Arrecifes samples constitute an isolated lineage. Moreover, the high value of genetic divergence (10% between the río de la Plata and the río Arrecifes populations could suggest that P. albicans may be conformed by a sibling species complex. On the other hand, a degree of genetic structuring was detected among different sites of the río de la Plata. A partial isolation of the 760 site may suggest that P. albicans could migrates to different tributaries for reproduction, generating different schools of haplotypes which could mix in the río de la Plata estuary. The high nucleotide diversity found in the 765 site and the existence of gene flow with the remaining collecting sites would be concordant with the outlined hypothetic scenarios of the mixing populations in the middle of the río de la Plata estuary.

  13. Iheringichthys labrosus (Siluriformes: Pimelodidae in the Piquiri River, Paraná, Brazil: population structure and some aspects of its reproductive biology

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    Arlei J. Holzbach

    Full Text Available The purpose of this study was to analyze the population structure (spatial and temporal distribution, sex ratio, length distribution and length/weight relationship and reproductive biology of Iheringichthys labrosus. This species is of importance as fisheries resource in the Paraná River basin. Fish were sampled, bimonthly, with gill and trammel nets at three sampling sites (Campina, Apertado and Altônia, located in the Piquiri River, between November 2002 and September 2003. In this study, 164 individuals were collected; the largest capture occurred in Campina site, with 209.88 individuals/1000 m² of net for 24 hours, while the shift of largest capture was night time (N and the month was July. Females occurred in larger numbers than males in all periods. The growth was allometric positive and the reproduction period was from the beginning of September to the end of December, with the majority of the individuals showing a standard length between 13.0 and 20.0 cm.

  14. Redescription of the tapeworm Monticellia amazonica de Chambrier et Vaucher, 1997 (Cestoda, Proteocephalidea), a parasite of Calophysus macropterus (Siluriformes, Pimelodidae), from the Amazon River

    Czech Academy of Sciences Publication Activity Database

    Scholz, Tomáš; de Chambrier, A.; Kuchta, Roman

    2008-01-01

    Roč. 53, č. 1 (2008), s. 30-35 ISSN 1230-2821 R&D Projects: GA MŠk LC522; GA ČR GA524/04/0342; GA ČR GD524/03/H133 Institutional research plan: CEZ:AV0Z60220518 Keywords : Cestoda * Monticellia amazonica * catfish * Amazonia * taxonomy * morphology Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 0.748, year: 2008

  15. NEW SPECIES OF DEMIDOSPERMUS (MONOGENEA: DACTYLOGYRIDAE) OF PIMELODID CATFISH (SILURIFORMES) FROM PERUVIAN AMAZONIA AND THE REASSIGNMENT OF UROCLEIDOIDES LEBEDEVI KRITSKY AND THATCHER, 1976

    Czech Academy of Sciences Publication Activity Database

    Mendoza-Palmero, Carlos Alonso; Scholz, Tomáš

    2011-01-01

    Roč. 97, č. 4 (2011), s. 586-592 ISSN 0022-3395 R&D Projects: GA MŠk LC522; GA ČR GD206/09/H026 Institutional research plan: CEZ:AV0Z60220518 Keywords : BRAZIL * ANCYROCEPHALINAE * TELEOSTEI * FISHES * GILLS Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 1.405, year: 2011

  16. Early Pleistocene lineages of Bagre bagre (Linnaeus, 1766 (Siluriformes: Ariidae, from the Atlantic coast of South America, with insights into the demography and biogeography of the species

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    Wemerson C. da Silva

    Full Text Available ABSTRACT Coastal and marine environments are characterized by a lack of evident physical barriers or geographic isolation, and it may be difficult to understand how divergence can arise and be sustained in marine environments. The identification of 'soft' barriers is a crucial step towards the understanding of gene flow in marine environments. The marine catfishes of the family Ariidae are a demersal group with restricted migratory behavior, no pelagic larval stages, and mechanisms of larval retention, representing a potentially useful model for the understanding of historical processes of allopatric speciation in the marine environment. In the present study, two lineages of the Coco sea catfish, Bagre bagre , were recognized from their complete segregation at both mitochondrial and morphological levels. One lineage is distributed between Venezuela and the northern coast of Brazil, including the semiarid northeast coast, while the second lineage is found on the eastern coast of Brazil, including the humid northeast coast. Based on distribution area, habitats preference, and genetic variability, inferences are made in relation to biogeography and demography of lineages in Atlantic coast of South America.

  17. Allozyme comparison of two populations of Rineloricaria (Siluriformes, Loricariidae from the Ivaí River, upper Paraná River basin, Brazil

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    Daniel M. Limeira

    2009-01-01

    Full Text Available Two allopatric morphotypes of the genus Rinelocaria were compared through the allozyme electrophoresis technique: one morphotype, R. pentamaculata, from the Keller River in the middle stretch of the Ivaí River basin and the other, R. aff. pentamaculata, from the São João River in the upper portion of the Ivaí River basin. The morphotype from the São João River was collected upstream from the São João waterfall, which is about 80 m deep. Twelve enzymatic systems (AAT, ADH, EST, GCDH, G3PDH, GPI, IDH, LDH, MDH, ME, PGM and SOD were analyzed, which allowed to score 22 loci. Only loci Aat-2, Est-3 and Mdh-C showed polymorphism. The two samples differed in allele frequencies at the three polymorphic loci. The average expected heterozygosity for all loci was 0.0806 ± 0.0447 in the Keller River sample. For the São João River morphotype, this value was 0.0489 ± 0.0350. Nei' s genetic identity and distance between the two populations were respectively 0.9789 and 0.0213. Wright's F IS, F IT and F STover all loci were estimated as 0.3121, 0.4021 and 0.1309, respectively. We consider that the two morphotypes represent species in statu nascendi.

  18. Proteocephalus brooksi n. sp. (Cestoda:Proteocephalidae) in the neotropical freshwater fish Rhamdia guatemalensis (Siluriformes: Pimelodidae) from Lake Catemaco, Veracruz, Mexico.

    Science.gov (United States)

    García-Prieto, L; Rodríguez, L M; Pérez-Ponce de León, G

    1996-12-01

    Proteocephalus brooksi n. sp. is described from the neotropical pimelodid fish Rhamdia guatemalensis from Lake Catemaco, Veracruz, México. The new species is characterized by the "paramuscular" position of vitellaria, the cortical origin of uterine stem with development of medullar lateral branches, the alternated position of vagina (anteriorly and posteriorly to cirrus sac), and the absence of apical organ and vaginal sphincter. Proteocephalus brooksi most closely resembles Nomimoscolex matogrossensis from which it differs in a series of characters. The probable paraphyletic nature of both Proteocephalus and Nomimoscolex and the convergent evolution of the "paramuscular" location of vitellaria among proteocephalideans are suggested, and the need for a phylogenetic analysis of the group is emphasized. The new species is assigned to Proteocephalus pending such an analysis.

  19. Ecology of a stream from upper Paraná River basin inhabited by Aspidoras fuscoguttatus Nijssen & Isbrüker, 1976 (Siluriformes, Callichthyidae

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    R. B. de Araujo

    Full Text Available ABSTRACT Most information on catfishes of the genus Aspidoras has focused species kept in aquaria, in non-natural conditions. Biotic and abiotic parameters of environment inhabited by Aspidoras fuscoguttatus, associated ichthyofauna, as well as strategies involved in the successful occupation of different microhabitats in a first order stream, located in São José do Rio Preto, São Paulo State, were investigated. Data collection was monthly performed at three segments (headwaters, middle course, and mouth from August 1999 to July 2000. The greatest values of water temperature, conductivity, turbidity, alkalinity, width, depth, and current velocity were obtained in the rainy season. Dissolved oxygen levels showed significant differences among three segments in all sampling months, except for September. Substrate composition was predominantly sandy, followed by silt and clay in middle course and mouth in rainy as much as in dry seasons. In headwaters a large increase of the sandy fraction occurred in the rainy season. In the marginal and aquatic vegetation 30 species of macrophytes and 5 of macroalgae were identified. The fauna included tadpoles of Anura and macroinvertebrates (Mollusca, Crustacea, Arachnida, and 8 orders of Insecta. A. fuscoguttatus was found throughout the entire stream in sympatry with 6 fish species. In middle course, cluster analysis revealed an association between A. fuscoguttatus immatures and low depth, suggesting a probable function of depth in that stage of ontogenetic development of catfishes. The results indicate that A. fuscoguttatus present plasticity in terms of microhabitat, including air breathing behavior in hypoxic conditions, previously unknown in genus Aspidoras.

  20. Pyxiloricaria menezesi, a new genus and species of mailed catfish from Rio Miranda and Rio Cuiabá, Brazil (Pisces, Siluriformes, Loricariidae)

    NARCIS (Netherlands)

    Isbrücker, I.J.H.; Nijssen, H.

    1984-01-01

    Pyxiloricaria menezesi n. gen., n. sp., is described and illustrated from Rio Miranda (Est. Mato Grosso do Sul) and from Rio Cuiabá (Est. Mato Grosso), Brazil. It is assigned to the subtribe Planiloricariina of the tribe Loricariini, subfamily Loricariinae. A comparison is made with sympatric

  1. An appraisal of the phylogenetic relationships of Hypoptopomatini cascudinhos with description of two new genera and three new species (Siluriformes: Loricariidae

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    Maria Laura S. Delapieve

    2017-12-01

    Full Text Available ABSTRACT The discovery of three new taxa of Hypoptotopomatini with ambiguous generic assignment prompted a reanalysis of the phylogenetic relationships of the tribe. The analysis focused on a data matrix of 56 terminals and 107 morphological characters comprising the three new taxa, most species of Hypoptopoma and Otocinclus, and all other species of the tribe. The 162 maximally parsimonious trees of 382 steps, consistency index of 0.41, and retention index of 0.83 were then summarized in a strict consensus tree. The results confirm the monophyly of the Hypoptopomatini, recover four genera as monophyletic (Acestridium, Hypoptopoma, Niobichthys, and Otocinclus, revealed Hypoptopoma and Oxyropsis to be non-monophyletic; and revealed two new genera within Hypoptopomatini. Additionally, Otocinclus was found to be sister to a group with all remaining genera of the tribe; Acestridium and Niobichthys were found to be sister to each other and that clade sister to a group formed by ((Leptotocinclus + Hypoptopoma [part] + (Nannoxyropsis (Oxyropsis + Hypoptopoma [part]. Based on this framework, changes to the classification and the taxonomy of the Hypoptopomatini are suggested and the new taxa are described.

  2. Biologia reprodutiva e dinâmica populacional de Hypancistrus zebra Isbrücker & Nijssen, 1991 (Siluriformes, Loricariidae), no rio Xingu, Amazônia brasileira

    OpenAIRE

    ROMAN, Ana Paula Oliveira

    2011-01-01

    Hypancistrus zebra é uma espécie ornamental, endêmica e rara da região do Médio – Baixo Rio Xingu, a qual apresenta forte demanda do mercado de peixes ornamentais internacional, que criou uma forte pressão de exploração associada a esta espécie. Atualmente, H.zebra encontra-se na lista brasileira de fauna ameaçada de extinção e sua captura está proibida. Sabe-se que mesmo proibida, a mesma continua sendo capturada e exportada ilegalmente, aliada a isso a construção da Hidrelétrica de Belo Mon...

  3. A new species of Silvinichthys (Siluriformes, Trichomycteridae) lacking pelvic fins from mid-elevation localities of the southern Andes, with comments on the genus.

    Science.gov (United States)

    Fernández, L; Sanabria, E A; Quiroga, L B; Vari, R P

    2014-02-01

    Silvinichthys huachi new species, is described from a stream along the lower slope of the Andean Cordillera in the Provincia de San Juan, Argentina. It shares the distinctive modifications characteristic of Silvinichthys, but is distinguished from the four previously described congeners by the combination of a lack of the pelvic fin and the pelvic girdle, details of pigmentation and various meristic and morphometric features. Silvinichthys huachi is apparently endemic to the type locality situated within an arid region of western central Argentina in the Andino Cuyana Province. Major gaps in the range of species of Silvinichthys may indicate that the origin of the genus predates the uplift events that subdivided drainages along the eastern slopes of the Andean Cordillera in west central Argentina. Silvinichthys huachi is hypothesized to be the sister species of Silvinichthys bortayro. © 2014 The Fisheries Society of the British Isles.

  4. A new long-finned Corydoras Lacépède, 1803 (Siluriformes: Callichthyidae from the lower rio Paraná basin, Brazil

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    Luiz F. C. Tencatt

    Full Text Available A new species of Corydoras is described from the lower rio Paraná basin, just downstream from Itaipu Dam, Brazil, close to Paraguay boundary. The new species can be distinguished from most of its congeners by the infraorbital 2 with a posterior laminar expansion conspicuously reduced, first and second dorsal-fin branched rays conspicuously elongated in males, mesethmoid entirely covered by skin, and by the presence of four to six irregular black or brownish blotches on the midline of the flank. The probable occurrence of the new species in the floodplain of the upper portion of the rio Paraná drainage is discussed.

  5. Larvae occurrences of Rhamdia quelen (Quoy & Gaimard, 1824 (Siluriformes: Heptapteridae in an area under dam influence in the upper Paraná River region, Brazil

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    Evelyn B. da Silva

    2011-06-01

    Full Text Available Rhamdia quelen (Jundiá is a catfish species of great interest to fish producers and researchers due to several favorable characteristics for inclusion in the Brazilian list of commercially raised fish. It has a wide geographical distribution, with occurrences reported from Central Argentina to South Mexico. Studies on the biological aspects of this species have been limited to captive adult fishes that were researched for farming purposes. Research related to ichthyoplankton has provided valuable information on spawning periods and sites and other aspects of breeding for numerous species of fish. This information is crucial for implementing management and protection strategies for these species. The studied floodplain is located in a lotic remnant between the Reservoirs of Itaipu and Engenheiro Sérgio Motta. This area is located inside a protected area (Ilha Grande National Park in the last portion of dam-free land along the Paraná River in the Brazilian territory; however, it is still threatened by the negative effects of the dams. We conducted monthly nocturnal collections during four periods from October to March, 2003 to 2007, in 22 locations along the main channel, secondary lakes and main tributaries of the Paraná River. After collection, the individuals were classified according to the degree of development and the notochord flexion and caudal fin support elements. Data were analyzed using principal component analysis (PCA, ANOVA and Pearson correlation to relate abiotic and larval density data. The increase of capture abundances in the four studied stages suggests that R. quelen is finding conditions that are favorable to its reproduction. The increase in captures can generate questions regarding R. quelen reproductive activity, for instance, whether the species is adapting or is influenced by environmental changes created by the Paraná River dams.Rhamdia quelen (jundiá é uma espécie de bagre que tem despertado grande interesse dos piscicultores e pesquisadores devido a várias características favoráveis a sua inclusão na lista de peixes criados comercialmente no país. Apresenta ampla distribuição geográfica, tendo sua ocorrência registrada desde a região central da Argentina até o sul do México, entretanto, os aspectos de sua biologia que foram estudados são em sua a maioria direcionada aos adultos e em cativeiro, com fins aquícolas. Pesquisas relacionadas ao ictioplâncton têm-se mostrado de grande importância por fornecer informações valiosas sobre a época, locais de desova e de criadouros naturais de várias espécies de peixes. Essas informações são fundamentais para a implementação de medidas de ordenamento e proteção dessas áreas. A planície de inundação estudada está localizada em um remanescente lótico, entre os reservatórios de Itaipu e Engenheiro Sérgio Motta. Apesar da unidade de conservação existente nesse trecho (Parque Nacional de Ilha Grande e de estar localizada no último trecho livre de barramentos do rio Paraná em território brasileiro, a área é especialmente impactada pelos efeitos negativos dos barramentos. Foram realizadas coletas mensais noturnas durante quatro etapas entre os meses de outubro a março dos anos de 2003 a 2007 em 22 estações no leito principal do rio Paraná, lagoas marginais e principais afluentes. Após as triagens, as larvas foram classificadas de acordo com o grau de flexão da notocorda e desenvolvimento dos elementos de suporte da nadadeira caudal. Os dados foram submetidos à Análise de Componentes Principais (ACP, Análise de Variância e correlação de Pearson para sumarizar os dados abióticos e as densidades de larvas. O aumento da abundância de captura, nas quatro fases estudadas sugere que R. quelen tem encontrado condições favoráveis à sua reprodução. O aumento na captura pode gerar dúvidas sobre a atividade reprodutiva de R. quelen, por exemplo, se a espécie se adapta ou é influenciada por alterações no ambiente criado pelas barragens do rio Paraná.

  6. Photo-identification as a technique for recognition of individual fish: a test with the freshwater armored catfish Rineloricaria aequalicuspis Reis & Cardoso, 2001 (Siluriformes: Loricariidae

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    Renato B. Dala-Corte

    Full Text Available Abstract Photo-identification allows individual recognition of animal species based on natural marks, being an alternative to other more stressful artificial tagging/marking techniques. An increasing number of studies with different animal groups has shown that photo-identification can successfully be used in several situations, but its feasibility to study freshwater fishes is yet to be explored. We demonstrate the potential use of photo-identification for intraspecific recognition of individuals in the stream-dwelling loricariid Rineloricaria aequalicuspis . We tested photo-identification in laboratory and field conditions based on the interindividual variability in abdominal bony plates. Our test yielded high correct matches in both laboratory (100% and field conditions (> 97%, comparable to other reliable techniques and to studies that successfully used photo-identification in other animals. In field conditions, the number of correct matches did not differ statistically between computer-assisted and naked-eye identification. However, the average time expended to conclude computer-assisted photo evaluations was about half of the time expended to conclude naked-eye evaluations. This result may be exacerbated when using database with large number of images. Our results indicate that photo-identification can be a feasible alternative technique to study freshwater fish species, allowing for a wider use of mark-recapture in ecological and behavioral studies.

  7. Description of Neblinichthys brevibracchium and N. echinasus from the upper Mazaruni River, Guyana (Siluriformes: Loricariidae, and recognition of N. roraima and N. yaravi as distinct species

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    Donald C. Taphorn

    Full Text Available Neblinichthys brevibracchium and N. echinasus are new sympatric species from upland tributaries of the Mazaruni River (Essequibo River basin of Guyana. These two new species are the first Neblinichthys reported from Guyana. Adult males of both new species have short pectoral-fin spines and several series of hypertrophied odontodes covering the entire dorsal surface and along the entire edge of the snout. They are distinguished from each other by dorsal-fin base length/standard length (18.1-22.8% in N. brevibracchium vs. 24.3-27.0% in N. echinasus, dorsal-anal distance/SL (13.7-18.3% in N. brevibracchium vs. 11.9-12.5% in N. echinasus, by having the snout decreasing in steep arc just anterior to eyes and then flattening in area anterior of nares in N. brevibracchium vs. the snout tapering shallowly and continuously from eyes to snout tip in N. echinasus; and by having the adpressed dorsal fin reaching the anterior preadipose plate in N. brevibracchium (vs. not reaching anterior preadipose plate in N. echinasus. They are distinguished from all congeners by lacking odontodes on the opercle (vs. odontodes present; and by completely lacking an iris operculum (vs. congeners with small iris operculum present or at least dorsal portion of iris flat instead of rounded. Neblinichthys echinasus and N. brevibracchium differ from all congeners by having a spotted or vermiculated pigment pattern on the abdomen (vs. abdomen plain; in N. echinasus the abdomen is darkly pigmented with bold white spots and in Neblinichthys brevibracchium the abdomen is light-colored with gray spots and vermiculations. Neblinichthys brevibracchium and N. echinasus differ from N. roraima by having one to two preadipose plates (vs. four or more. New observations revealed Neblinichthys roraima and N. yaravi to be distinct, with N. roraima having four or more preadipose plates and N. yaravi having one or two. Both are present in the upper río Caroní, an Orinoco tributary that drains the slopes of Mount Roraima and other mountains of the Pacaraima Range in Venezuela and interdigitates with headwaters of the Mazaruni River.

  8. Otocinclus cocama, a new uniquely colored loricariid catfish from Peru (Teleostei: Siluriformes, with comments on the impact of taxonomic revisions to the discovery of new taxa

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    Roberto E. Reis

    Full Text Available A new, uniquely colored species of the loricariid catfish genus Otocinclus, O. cocama is described from a tributary to the lower río Ucayali in northern Peru. The new species is distinguished from other Otocinclus species by two putatively autapomorphic features, the distinct color pattern, consisting of vertically elongated blotches spanning from the dorsal midline to the ventral border of flanks, and by a complete lateral line. The phylogenetic relationships of the new species are investigated and it is apparently more closely related to a clade formed by O. huaorani, O. bororo, O. mariae, and O. mura. Comments on the impact of taxonomic revisions for the discovery and description of previously undetected biodiversity are also presented.

  9. Isolation of probiotic bacteria from the hybrid South American catfish Pseudoplatystoma reticulatum × Pseudoplatystoma corruscans (Siluriformes: Pimelodidae: A haematological approach

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    José Luiz Pedreira Mouriño

    2016-05-01

    Full Text Available This study investigated bacterial strains with probiotic potential isolated from the middle portion of healthy hybrid surubim catfish foregut (Pseudoplatystoma reticulatum female × P. corruscans male. Twenty surubims weighing 1.5 ± 0.3 kg were used for bacterial isolation. In total, 41 strains of bacteria were selected in vitro. Ten strains had inhibition zones >10 mm against Aeromonas hydrophila. Five of those strains presented inhibition zones > 9 mm against other pathogenic bacteria and reached concentrations greater than 105 CFU mL−1 in tubes containing de Man, Rogosa and Sharpe (MRS medium. In particular, Weissella cibaria (P36 reached 106 CFU mL−1 in MRS and was able to reduce the pH of the medium to 3.85. In the in vivo intestinal colonization studies, 72 healthy hybrid surubims were fed with a commercial diet supplemented with probiotic W. cibaria for 15 days. Changes in gut community composition were then analyzed, and probiotic profile of W. cibaria was determined molecularly by amplification of rRNA 16S gene was performed using PCR. Compared to control fish, W. cibaria-supplemented fish showed an increase in RBC. These results show the efficacy of our haematological approach to probiotic screening in hybrid sorubim.

  10. New species of Ameloblastella Kritsky, Mendoza-Franco & Scholz, 2000 and Cosmetocleithrum Kritsky, Thatcher & Boeger, 1986 (Monogenea: Dactylogyridae) infecting the gills of catfishes (Siluriformes) from the Peruvian Amazonia

    Czech Academy of Sciences Publication Activity Database

    Mendoza-Franco, E. F.; Mendoza-Palmero, C. A.; Scholz, Tomáš

    2016-01-01

    Roč. 93, č. 9 (2016), s. 847-862 ISSN 0165-5752 R&D Projects: GA ČR(CZ) GBP505/12/G112 Institutional support: RVO:60077344 Keywords : neotropical Monogenea * Ancyrocephalinae * Pimelodidae * redescription * proposal * Brazil Subject RIV: EG - Zoology Impact factor: 1.181, year: 2016

  11. Evaluation of the fossil fish-specific diversity in a chadian continental assemblage: Exploration of morphological continuous variation in Synodontis (Ostariophysi, Siluriformes).

    Science.gov (United States)

    Pinton, Aurélie; Le Fur, Soizic; Otero, Olga

    2016-11-01

    In the fossil record, the quantification of continuous morphological variation has become a central issue when dealing with species identification and speciation. In this context, fossil taxa with living representatives hold great promise, because of the potential to characterise patterns of intraspecific morphological variation in extant species prior to any interpretation in the fossil record. The vast majority of catfish families fulfil this prerequisite, as most of them are represented by extant genera. However, although they constitute a major fish group in terms of distribution, and ecological and taxonomic diversity, the quantitative study of their past morphological variation has been neglected, as fossil specimens are generally identified based on the scarcest remains, that is, complete neurocrania that bear discrete characters. Consequently, a part of freshwater catfish history is unprospected and unknown. In this study, we explored the morphological continuous variation of the humeral plate shape in Synodontis catfishes using Elliptic Fourier Analysis (EFA), and compared extant members and fossil counterparts. We analysed 153 extant specimens of 11 Synodontis species present in the Chad basin, in addition to 23 fossil specimens from the Chadian fossiliferous area of Toros Menalla which is dated around 7 Ma. This highly speciose genus, which is one of the most diversified in Africa, exhibits a rich fossil record with several hundred remains mostly identified as Synodontis sp. The analysis of the outline of the humeral plate reveals that some living morphological types were already represented in the Chad Basin 7 My ago, and allows for the discovery of extinct species. Beside illuminating the complex Neogene evolutionary history of Synodontis, these results underline the interest in the ability of isolated remains to reconstruct a past dynamic history and to validate the relevance of EFA as a tool to explore specific diversity through time. J. Morphol. 277:1486-1496, 2016. © 2016 Wiley Periodicals, Inc. © 2016 Wiley Periodicals, Inc.

  12. Population Genetic Structure and Genetic Diversity in Twisted-Jaw Fish, Belodontichthys truncatus Kottelat & Ng, 1999 (Siluriformes: Siluridae, from Mekong Basin

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    Surapon Yodsiri

    2017-01-01

    Full Text Available The Mekong River and its tributaries possess the second highest diversity in fish species in the world. However, the fish biodiversity in this river is threatened by several human activities, such as hydropower plant construction. Understanding the genetic diversity and genetic structure of the species is important for natural resource management. Belodontichthys truncatus Kottelat & Ng is endemic to the Mekong River basin and is an important food source for people in this area. In this study, the genetic diversity, genetic structure, and demographic history of the twisted-jaw fish, B. truncatus, were investigated using mitochondrial cytochrome b gene sequences. A total of 124 fish specimens were collected from 10 locations in the Mekong and its tributaries. Relatively high genetic diversity was found in populations of B. truncatus compared to other catfish species in the Mekong River. The genetic structure analysis revealed that a population from the Chi River in Thailand was genetically significantly different from other populations, which is possibly due to the effect of genetic drift. Demographic history analysis indicated that B. truncatus has undergone recent demographic expansion dating back to the end of the Pleistocene glaciation.

  13. Histological and ultrastructural characteristics of the testis of the invasive suckermouth sailfin catfish Pterygoplichthys disjunctivus (Siluriformes: loricariidae) from Marikina River, Philippines.

    Science.gov (United States)

    Jumawan, Joycelyn C; Herrera, Annabelle A

    2015-02-01

    The histological and ultrastructural features of the testis of the invasive suckermouth sailfin catfish Pterygoplichthys disjunctivus rapidly proliferating in Marikina River, Philippines were characterized during the fish's 2010-2011 reproductive season. The germinal compartment of the testes was composed of anastomosing tubules with cysts undergoing synchronous development. Spermatogenic cells were along the length of the testes indicate it to be of the unrestricted spermatogonial type. The spermatozoon is classified as type 1 ect aquasperm devoid of acrosome, has rounded nucleus, and a long flagellum - characteristics necessary for external fertilization. Male P. disjunctivus was reproductively active during half of the year-long study with peak spawning during the most rainy months (June-August) and prolonged recrudescence during the dry months (February-May). Results from this study form a histological baseline to describe the gonad dynamics and reproduction of this invasive fish species as well as provide possible means of mechanical control to curb the population of the fish in this river. Copyright © 2014 Elsevier Ltd. All rights reserved.

  14. Fauna parasitária dos híbridos siluriformes cachapinta e jundiara nos primeiros estágios de desenvolvimento

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    Arlene Sobrinho Ventura

    2013-08-01

    Full Text Available O objetivo deste trabalho foi avaliar a fauna parasitária dos peixes híbridos cachapinta (Pseudoplatystoma corruscans macho x P. reticulatum fêmea e jundiara (Leiarius marmoratus macho x P. reticulatum fêmea no período de larvicultura. Um total de 315 animais, 126 híbridos jundiara e 189 híbridos cachapinta, foram examinados de acordo com o estágio de desenvolvimento: larvas, pós-larvas e alevinos. Larvas e pós-larvas foram prensadas entre lâmina e lamínula e observadas sob microscopia óptica. Os alevinos foram observados externamente em estereomicroscópio e necropsiados para avaliação interna dos órgãos. Foram aferidos os parâmetros de qualidade de água em todas as fases de cultivo. O exame parasitológico revelou a presença dos protozoários Epistylis sp. e Trichodina sp., no tegumento e nas brânquias, Ichthyophthirius multifiliis no tegumento, dos helmintos Monogenea nas brânquias, e das metacercárias de digenéticos em brânquias, baço, rins, fígado e intestino, em ambos os híbridos analisados. Os parasitos Epystilis sp., Trichodina sp. e metacercária de digenéticos ocorrem com maior frequência nos dois híbridos, nas fases de pós-larvas e alevinos. Há maior prevalência e diversidade de parasitos na fase de alevinagem dos híbridos estudados.

  15. A new species of Microglanis(Siluriformes: Pseudopimelodidae from the upper rio Tocantins basin, Goiás State, Central Brazil

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    Oscar Akio Shibatta

    Full Text Available A new species of Microglanis is described from the upper rio Tocantins basin, Barro Alto, Goiás State, Brazil. This species is distinguished from the others by presenting a unique color pattern, consisting of round spots in the flank between the larger dark brown blotches. Moreover, it can be distinguished by the combination of the following features: caudal fin emarginate, the upper lobe slightly larger than the lower, lateral line relatively long, reaching vertical through posterior margin of the pelvic fin, and light stripe on supra-occipital region absent or very narrow and with irregular shape.

  16. A new genus and species of proteocephalidean tapeworm (Cestoda), first parasite found in the driftwood catfish Tocantinsia piresi (Siluriformes: Auchenipteridae) from Brazil

    Czech Academy of Sciences Publication Activity Database

    Alves, P.V.; de Chambrier, A.; Scholz, Tomáš; Luque, J.L.

    2015-01-01

    Roč. 62, January 2015 (2015), 006 ISSN 0015-5683 R&D Projects: GA ČR GBP505/12/G112 Institutional support: RVO:60077344 Keywords : taxonomy * morphology * Proteocephalidea * metascolex * Amazon River basin * Xingú River * Neotropical Region Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 1.271, year: 2015

  17. Integrated analysis of two biomarkers in Sciades herzbergii (Ariidae, Siluriformes, to assess the environmental impact at São Marcos' Bay, Maranhão, Brazil

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    Débora Batista Pinheiro-Sousa

    2013-04-01

    Full Text Available Guribu catfish (Sciades herzbergii is a resident species in estuaries of Maranhão, Brazil. The aim of this work was to determine the feasibility of integrated analysis of the branchial lesions and gonadosomatic index of Sciades herzbergii in order to evaluate the effects of pollutants in São Marcos' Bay. The first site (S1 is located near the Ilha dos Caranguejos and was used as a reference area for being an environmental protection area. The second site (S2 is located near the ALUMAR/ALCOA port, and was used as a potentially polluted area. Fish were collected at each site, forty-eight in S1 and forty in S2. Gills were fixed in 10% formalin, and usual histological techniques were used in the first right gill arch, with inclusion in paraffin and sections of 5 µm thickness. There were no histopathological changes in animals captured at the reference site. However, in those catfish collected in the potentially contaminated area it was observed several branchial lesions, such as lifting of the lamellar epithelium, fusion of some secondary lamellae, hypertrophy of epithelial cells and lamellar aneurysm. The analysis using the gonadosomatic index (GSI showed significant differences, being higher in fish analyzed from the reference area (P < 0.05. The branchial lesions and GSI were sensitive for monitoring environmental impacts of different locations at São Marcos' Bay, Maranhão, Brazil.

  18. The Length-Weight, Length-Length Relationship and Condition Factor of Angora Loach, Oxynoemacheilus angorae (Steindachner, 1897 Inhabiting Kılıçözü Stream in Kızılırmak River Basin (Central Anatolia-Turkey

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    Okan Yazıcıoğlu

    2016-12-01

    Full Text Available In this study, length-weight relationship (LWR, length- length relationship (LLR and condition factor (K of Angora loach, Oxynoemacheilus angorae were determined. A total of 103 specimens were sampled from Kılıçözü Stream in 2014. The length and weight of specimens were ranged 3.5-9.8 cm and 0.38-6.58 g, respectively. Length-weight relationships for female, male and all samples were found as W= 0.01056.TL2.896 (r²= 0.923, W= 0.00963.TL2.940 (r²= 0.978 and W= 0.00987.TL2.929 (r²= 0.963, respectively. LWRs indicated an isometric growth in female, male and all samples. The values of Fulton’s condition factor (K ranged from 0.699 to 1.246 for females and from 0.654 to 1.072 for males. All length-length relationships were statistically significant.

  19. Variações espaço-temporais na alimentação de Pimelodus ortmanni (Siluriformes, Pimelodidae no reservatório de Segredo e áreas adjacentes (PR Spatio temporal variations in Pimelodus ortmanni (Siluriformes, Pimelodidae feeding in Segredo reservoir and contigous areas (PR

    Directory of Open Access Journals (Sweden)

    Márcia Regina Russo

    1999-07-01

    Full Text Available Este trabalho teve como objetivo conhecer a dieta de Pimelodus ortmanni (Haseman, 1911 no reservatório de Segredo e nas áreas adjacentes, em três períodos consecutivos à formação desse reservatório (rio Iguaçu-PR. As coletas foram realizadas no período de março de 93 a fevereiro de 96 no reservatório, nos tributários e jusante. Foram analisados 808 estômagos pelos métodos de freqüência de ocorrência e volumétrico, combinados no índice alimentar. A espécie foi caracterizada como omnívora-carnívora, em função do amplo espectro alimentar (41 itens, embora peixes e insetos tenham se destacado, na dieta, durante o período de estudos. Recursos alimentares de origem alóctone foram mais expressivos no reservatório e na jusante no primeiro período, diminuindo no último, ao contrário dos tributários. Através da análise de correspondência destendenciada (DCA, foram discriminados dois grupos espaço-temporais em relação à dieta: - nos menores escores, agruparam-se exemplares provenientes da jusante (2º período e do reservatório (2º e 3º período e, nos maiores escores, exemplares da jusante (1º período e dos tributários (2º e 3º períodos. Essa segregação pode estar associada à disponibilidade dos recursos alimentares nas diferentes estações e períodos de coleta.The aim of this paper is to investigate the diet of Pimelodus ortmanni in Segredo reservoir and contigous areas in three different periods after the reservoir formation (Iguaçu river, state of Paraná, Brazil. The samples were collected from March/93 to February/96 in the reservoir, tributaries and downstream. A total of 808 stomachs were analyzed by occurrence and volumetric methods combined in the food index. The species was characterized as omnivorous-carnivorous due to the ample food spectrum (41 items, though fishes and insects prevailed in the diet over the whole investigated time. In the first and second periods allocthonous food resources were more expressive than authoctonous resources in the reservoir and downstream, but decreased in the last period. The reverse was observed in the tributaries. The detrended correspondence analysis (DCA discriminated two spatiotemporal groups in relation to diet: the lower scores grouped fishes coming from downstream (second period and from the reservoir (second and third periods, while the higher scores grouped fishes from downstream (first period and tributaries (second and third periods. This segregation may be due to the availability of food resources in the different stations and periods of sampling.

  20. Efeito da adição de aminoácidos essenciais à dieta sobre a secreção de enzimas digestivas de jundiá Rhamdia quelen (Siluriformes, Pimelodidae = Effect of dietary essential amino acids addition on digestive enzime secretion in silver catfish Rhamdia quelen (Siluriformes, Pimelodidae

    Directory of Open Access Journals (Sweden)

    Alexandre Bernardini Ungar

    2009-01-01

    Full Text Available Em estudos realizados com variação no teor de proteína na ração para peixes, foi demonstrado o aumento das atividades de protease alcalina, protease ácida, tripsina e quimiotripsina do trato digestório de jundiá (Rhamdia quelen. Esses fatos sugerem que produtos liberados pela digestão na luz desse trato podem influenciar a síntese e a secreção de enzimas digestivas. A secreção destas enzimas pelo pâncreas, em vertebrados, responde à influência neurale humoral. No presente trabalho, foram testadas quatro concentrações (0, 3, 6 e 12% de uma mistura de aminoácidos (treonina, fenilalanina, leucina, valina, arginina e triptofano em iguaisproporções em dietas isocalóricas contendo 3.500 kcal de energia digestível kg-1 de ração, e dietas isoproteicas contendo 20% de proteína, em juvenis de jundiá. Foram utilizados dez animais portratamento, sendo os peixes estocados num sistema fechado com recirculação de água e temperatura controlada. Os peixes submetidos a estes tratamentos apresentaram atividade da protease alcalina na região anterior do intestino, responsiva aos diferentes níveis aminoácidos da alimentação. Todavia, as atividades protease alcalina do fígado e amilase do fígado e intestino anterior não foram detectadas. Estes resultados sugerem que a atividade protease alcalina do intestino anterior seja induzida por aminoácidos liberados na luz do trato digestório. Studies carried out with variation of protein concentration in the fish feed have shown an increase in the activity of alkaline proteases, acid proteases, trypsin and chimotrypsin from the digestive tract of silver catfish (Rhamdia quelen. These facts suggest that products released by digestion in the lumen of this tract can influenced the synthesis and secretion of digestive enzymes. The secretion of these enzymes by the pancreas in vertebrate responses to neural and humoral influences. In the present study, four concentration (0, 3, 6 and 12% of an amino acid mix(threonine, phenylalanine, leucine, valine, arginine and thryptophan, in equal amounts were tested in isocaloric (3500 kcal of digestible energy kg-1 of feed and isoproteic (20% of protein diets on juveniles of silver catfish. It was used 10 specimens per treatment stocked in a water recirculation system, with controlled and constant temperature. The fish submitted to the treatments presented alkaline activity in the anterior region of the gut, responding to thedifferent levels of amino acid in the feed. Although there was alkaline proteases activity in the liver, the amylase activity of the liver and anterior gut was not observed.

  1. Cambios histomorfológicos en los testes del Capitán, Eremophilus Mutisii (Trichomycteridae, Siluriformes, durante el ciclo reproductivo anual en el sistema del río Bogotá en Colombia Cambios histomorfológicos en los testes del Capitan, Eremophilus Mutisii (Trichomycteridae, Siluriformes, durante el ciclo reproductivo anual en el sistema del rio Bogotá en Colombia

    Directory of Open Access Journals (Sweden)

    Cala Plutarco

    1986-06-01

    Full Text Available Esta investigación establece los cambios histomorfológicos testiculares en el capitán, Eremophilus mutisii, en el sistema del río Bogotá. Peces con testículos vacíos aparecen a comienzos de mayo, y su subsecuente presencia en junio, julio y agosto indica la duración de la fase reproductiva. La mayoría de estos peces se reproducen en junio y julio. La espermatogénesis en E. mutisii puede dividirse en cuatro estadios: Formación de agregados de espematogonios (Figs. 6 &. 10-12. Maduración o formación de espermatocitos (T, espermátides (D yespermatozoides (Z (Figs. 1-6 &. 12. La pared lobular se rompe y da paso a los espermatozoides maduros y viables que llenan los conductos espermáticos (Figs. 7 &. 8. Período de involución (Figs. 9-11. El esperma residual es, probablemente, engullido por fagocitosis, aparecen quistes de células germinales en las paredes lobulares. Capitanes con una longitud total mayor de 15 cm se encontraron sexualmente maduros.  The main purpose of this research is to establish the annual morphohistological changes in the testes of the fish Eremophilus mutisii in the río Bogotá basin in Colombia. Spent testes appear in early May, and the subsequent presence in June. July and August indicates the duration of the reproductive phase. Most fishes spawn in June and July. The spermatogenic process of  E. mutisii shows that it undergoes distinct morphological changes which are of cyclic and seasonal nature. Four stages can broadly be recognised:  Formation of aggregates of spermatogonia (Figs. 6 & 10-12. Formation of the spermatocytes (T. spermatids (D and spermatozoa (Z (Figs. 1-6 & 12. Completely mature and viable spermatozoa fill the sperm ducts (Figs. 7 & 8. Period of involution (Figs. 9-11 - the residual sperm (E is, probably, engulfed by a phagocytic process, and clusters of primordial germ cells (C occur at the margin of the lobules. E. mutisii greater than 15 crn in total length were mature. Their gonosomatic index exhibited seasonal variation (Table 1 & Graph 1.

  2. Maturidade do ovário no cascudo Hypostomus strigaticeps (Siluriformes, Loriicaridae - DOI: 10.4025/actascibiolsci.v30i1.1474 Ovarian organization and maturity stages of armored catfish Hypostomus strigaticeps (Siluriformes, Loriicaridae - DOI: 10.4025/actascibiolsci.v30i1.1474

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    Laura Satiko Okada Nakaghi

    2008-03-01

    Full Text Available No presente trabalho, foi estudado o desenvolvimento ovariano do cascudo Hypostomus strigaticeps. Foram coletadas 332 fêmeas, em coletas mensais, de julho de 2002 até junho de 2004, no rio Corumbataí, Estado de São Paulo, bacia do Paraná. Os ovários foram processados com técnicas histológicas de rotina, com inclusão em parafina, corte com 5 μm de espessura e coloração em hematoxilina-eosina. Foram observados seis tipos de ovócitos: Cromatina-nucléolo, Perinucleolar, Alvéolo-cortical, Vitelogênico, Maduro e Atrésico. Foi construída uma escala de maturidade, a partir de observações microscópicas, macroscópicas e do índice gonadossomático com quatro fases: Repouso, Maturação, Maduro e DesovadoThis work studied the ovarian development of the armored catfish Hypostomus strigaticeps. Between July 2002 and June 2005, 332 females were collected monthly from the Corumbataí River, São Paulo State – Brazil. The ovaries were processed using routine histological techniques – paraffin inclusion and 5 μm thick sections stained in hematoxylin-eosin. Six types of oocytes were observed: Chromatin-nucleolus, Perinucleolar, Cortical-alveolus, Vitellogenic, Ripe and Atresic. Four maturity stages were created based on macroscopic and microscopic morphological observations, as well as on analysis of the gonadossomatic index (GSI: Rest, Maturation, Ripe and Spawned

  3. Nuevos registros de los plecos Pterygoplichthys pardalis (Castelnau 1855) y P. disjunctivus (Weber 1991) (Siluriformes: Loricariidae) en el Sureste de México New records of the sailfish catfishes Pterygoplichthys pardalis (Castelnau 1855) and P. disjunctivus (Weber 1991) (Siluriformes: Loricariidae) in Southeastern Mexico

    OpenAIRE

    Armando T. Wakida-Kusunoki; Luis Enrique Amador del Angel

    2008-01-01

    Se reporta la presencia de los plecos Pterygoplichthys pardalis y P. disjunctivus en nuevas localidades en el sureste de México. Los organismos fueron colectados en los ríos San Pedro y Palizada en el estado de Campeche en diciembre de 2007. Estos registros representan el primer reporte en México de P. disjunctivus y el primero de P. pardalis en Campeche.The sailfish catfishes Pterygoplichthys pardalis and P. disjunctivus are reported in new localities in Southeastern Mexico. The specimens we...

  4. The helminth community of the skink Chalcides sexlineatus from Gran Canaria (Canary Islands).

    Science.gov (United States)

    Roca, V; Carretero, M A; Jorge, F; Perera, A; Ferrero, A; Rodríguez-Reina, S

    2012-06-01

    A survey of the gastrointestinal helminth communities of a population of Chalcides sexlineatus Steindachner, a small skink endemic to Gran Canaria island (Canary Archipelago, Spain), was conducted to determine the prevalence, abundance and species diversity of intestinal parasites in these reptiles. Only three parasite species were found, one cestode, Oochoristica agamae Baylis, 1919 and two nematodes, Parapharyngodon micipsae (Seurat, 1917) and Pharyngodonidae gen. sp. Helminth infracommunities of C. sexlineatus showed low values of abundance and species richness and diversity, being more similar to the helminth community of Tarentola boettgeri boettgeri (Steindachner) rather than those of Gallotia stehlini (Schenkel), both syntopic with the sampled host.

  5. Online Resources Isolation and characterization of microsatellite ...

    Indian Academy of Sciences (India)

    张润华

    highland fish, Pareuchiloglanis sinensis (Siluriformes: Sisoridae) ... under following criteria: (1) primers length ranging from 18 to 25 bases (optimum 20 ... amplified products were detected on an ABI 3130xl Genetic Analyzer, and scored using.

  6. Apuntes sobre la reproduccion de algunos Bagres marinos

    NARCIS (Netherlands)

    Luengo, José A.

    1973-01-01

    Mouthbreeding in the male, and modifications of the pelvic fins of the female are recorded for the first time in Selenaspis herzbergii. The pelvic girdle of Selenaspis herzbergii is compared with those of Sciadeichthys proops, Arius spixii, and Bagre marinus. Data are given on eggs and fry in the

  7. Isolation and characterization of twenty-five polymorphic ...

    Indian Academy of Sciences (India)

    markers in Siniperca scherzeri Steindachner and cross-species amplification. J. Genet. .... ACT. AGT. AGTGTGTGCAAGT. AGA. 188–247. 55. 8. 0.875. 0.8185. 0.7804. 0.2352. R: .... diversity and population structure of the endangered Spanish.

  8. Ultrastructural study of spermiogenesis and the spermatozoon of the proteocephalidean cestode Barsonella lafoni de Chambrier et al., 2009, a parasite of the catfish Clarias gariepinus (Burchell, 1822) (Siluriformes, Clariidae)

    Czech Academy of Sciences Publication Activity Database

    Marigo, A. M.; Levron, Céline; Bâ, Ch. T.; Miquel, J.

    2012-01-01

    Roč. 251, č. 2 (2012), s. 147-159 ISSN 0044-5231 R&D Projects: GA AV ČR KJB600960813 Institutional research plan: CEZ:AV0Z60220518 Keywords : Spermiogenesis * Spermatozoon * Ultrastructure * Barsonella lafoni * Proteocephalinae * Proteocephalidae * Proteocephalidea * Cestoda Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 1.400, year: 2012

  9. Influence of cage farming on feeding and reproductive aspects of Pimelodus maculatus Lacépède, 1803 (Siluriformes: Pimelodidae in the Chavantes reservoir, Brazil - doi: 10.4025/actascibiolsci.v36i1.

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    Heleno Brandão

    2013-09-01

    Full Text Available This study evaluated the diet and reproductive aspects of the population of Pimelodus maculatus around net cage fish farming in order to assess the possible impacts of this activity. Monthly collections were performed from March 2008 to February 2009 on two populations: one close to the net cages (NC and one from an area not influenced by these cages denominated the “reference site” (RS. Results of the Alimentary Index (AI, Gonadosomatic Index (GSI, reproductive potential and histological analysis were obtained for both NC and RS populations. The population from NC used leftover food (ration that escapes from net cages as the main food item (99.3%. For the RS population, the detritus item was the more important food source (51.7%. The Detrended Correspondence Analysis (DCA showed that the use of food resources was different between the two sites. The reproductive period of the species (indicated by the GSI revealed that the population of the NC showed an extended reproductive period compared to RS. The histology of the ovaries indicated that the specimens in the NC were spawning capable. This study indicates that fish farming activities influence the species P. maculatus in the Chavantes reservoir by adding a new resource to the food web.

  10. [The endoparasitic helminths of Pimelodus maculatus Lacépède, 1803 Siluriformes, Pimelodidae) from the two localities (Lagoon and gutter of the River) of the Guandu River, State of Rio de Janeiro, Brazil].

    Science.gov (United States)

    Albuquerque, Marcia C; Santos, Michelle D; Monteiro, Cassandra M; Martins, Amanda N; Ederli, Nicole B; Brasil-Sato, Marilia C

    2008-09-01

    Between November 2003 and March 2004, fourty specimens of Pimelodus maculatus Lacépède, 1803 from Guandu River and thirty-nine from Guandu Lagoon (Nova Iguaçu, RJ) were collected, for the analysis of endoparasitic fauna. A total of 236 specimens of Cucullanus pinnai Travassos, Artigas & Pereira, 1928 (Nematoda, Cucullanidae) were collected, being 163 adult specimens in the gut, three in the stomach and 70 larvae in the celomatic cavity and seven specimens of adults Nomimoscolex sp. (Eucestoda, Proteocephalidea) in the gut were found. Cucullanus pinnai presented prevalence (P) 77.50%, mean intensity (MI) 3.40 and mean abundance (MA) 2.60 on River and P: 66.67%, MI: 5.04, MA: 3.36 on Lagoon. Nomimoscolex sp. presented on River P: 2.50%, MI: 2.00, MA: 0.05, and P: 10.26%, MI: 1.25, MA: 0.13 on Lagoon. There was not significant positive interspecific association on the lagoon. In this research, the endoparasitic richness of P. maculatus was scarcest than similar studies in Guandu River and others rivers of different basins. The results about C. pinnai could be suggesting that the cycle of C. pinnai evolve only a host, occurring a histotrophic fase, in this case, in P. maculatus. Periodic analysis of the endoparasites indices in P. maculatus through the years may be used to describe the hydric quality of the Guandu River.

  11. Distribuição, abundância relativa e movimentos sazonais de bagres marinhos (Siluriformes, Ariidae no estuário da Lagoa dos Patos (RS, Brasil

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    Francisco Gerson Araújo

    1988-01-01

    Full Text Available Three ariid fish, Netuma barba, Netuma planifrons and Genidens genidens, use the estuary of the Patos Lagoon (32ºS, Rio Grande do Sul, Brazil, as a nursery and feeding ground in various stages of their life history. A comparative study was made of the temporal and spatial distribution and relative abundance. Seasonal movements were interpreted on the basis of distribution and abundance of the young of these coexisting sea catfishe. Monthly otter trawl samples were made between November, 1979 and April, 1983. Temperature, salinities and dissolved oxygen contents were taken at each of the 674 sample stations. All three species were caught in ample temperature (12,1 to 26,3ºC, salinity (0,3 to 35,5‰ and dissolved oxygen (4,7 to 11,5 mg/l ranges. However, they were more abundant in stations of low temperature and in salinity with highly dissolved oxygen content. N. barba was the most abundant catfish caught in the estuary, it constituted 81,9% in number and 81,4% in weight of ali ariid trawl catches during the study. N. barba occurred throughout the estuary, from the adjacent coastal region to the upper reaches of the Patos Lagoon estuary near the liminetic zone. N. planifrons occurred from adjacent coastal regions to low saline parts of the Patos Lagoon estuary, whereas G. genidens were distributed mainly in low saline and freshwater parts of the lagoon. Young-of-the-year N. barba aggregated near of the entrance of the lagoon in fall and winter, then moved up to intermediary parts of the estuary in spring, and they went to the upper part of the estuary in summer. Yearlings N. barba moved into the estuary in common with young-of-the-year but did not reach the coastal adjacent area. Young-of-the-year and yearling N. planifrons moved in to the estuary as the same pattern as N. barba but they became scarce during the late summer and early fall. G. genidens were scarcely captured in the estuary throughout the year. The spatial and temporal segregations among Netuma and Genidens were evident. A hypothetical model for the life history of N. barba is suggested.

  12. Ontogenetic and seasonal shifts in the diet of the pemecou sea catfish Sciades herzbergii (Siluriformes: Ariidae), from a macrotidal mangrove creek in the Curuçá estuary, northern Brazil.

    Science.gov (United States)

    Giarrizzo, Tommaso; Saint-Paul, Ulrich

    2008-06-01

    The feeding ecology of pemecou sea catfish (Sciades herzbergii) was studied bimonthly from September 2003 to July 2004 in a macrotidal mangrove creek at Curuçá estuary, Brazil. Feeding activity and relative importance of prey groups were assessed in 528 and 226 specimens (6.2 to 36.0 cm total length), respectively, using stomach contents. A total of 1 820 specimens were caught. The fish left the creek with an average of 2.2% of their body weight in prey. Feeding activity was lower in the dry season (September and November 2003) than in the rainy season (January to May 2004). The diet was dominated by Ocypodidae and Grapsidae. Feeding strategies of the pemecou sea catfish indicated a slight variation between the diets of adults and juveniles; however; the main factor leading to diversification in the diet were the seasons. Opportunistic feeding behavior was observed in the dry season, shifting to more specialized feeding in the wet season. This temporal diet shift may be explained by the environmental seasonal variations (e.g., transparency of the water, high water level) in the intertidal mangrove creek habitat.

  13. Ontogenetic and seasonal shifts in the diet of the pemecou sea catfish Sciades herzbergii (Siluriformes: Ariidae, from a macrotidal mangrove creek in the Curuçá estuary, Northern Brazil

    Directory of Open Access Journals (Sweden)

    Tommaso Giarrizzo

    2008-06-01

    Full Text Available The feeding ecology of pemecou sea catfish (Sciades herzbergii was studied bimonthly from September 2003 to July 2004 in a macrotidal mangrove creek at Curuçá estuary, Brazil. Feeding activity and relative importance of prey groups were assessed in 528 and 226 specimens (6.2 to 36.0 cm total length, respectively, using stomach contents. A total of 1 820 specimens were caught. The fish left the creek with an average of 2.2 % of their body weight in prey. Feeding activity was lower in the dry season (September and November 2003 than in the rainy season (January to May 2004. The diet was dominated by Ocypodidae and Grapsidae. Feeding strategies of the pemecou sea catfish indicated a slight variation between the diets of adults and juveniles; however; the main factor leading to diversification in the diet were the seasons. Opportunistic feeding behavior was observed in the dry season, shifting to more specialized feeding in the wet season. This temporal diet shift may be explained by the environmental seasonal variations (e.g. transparency of the water, high water level in the intertidal mangrove creek habitat. Rev. Biol. Trop. 56 (2: 861-873. Epub 2008 June 30.Estudiamos la ecología trófica del bagre guatero Sciades herzbergii, con periodicidad bimestral, desde septiembre de 2003 a julio de 2004, en un canal de marea del estuario del río Curuçá, norte de Brasil. Del total de 1820 ejemplares capturados, analizamos la actividad alimentaría y la importancia de las diferentes fuentes de alimento por evaluación de los contenidos estomacales de 528 y 226 ejemplares (longitud corporal 6,2 a 36,0 cm, respectivamente. S. herzbergii sale del canal de marea con un valor promedio de 2,2 % de su peso corporal como alimento. El ritmo alimentario fue menor durante el período seco (septiembre a noviembre de 2003 que en el lluvioso (enero a mayo de 2004. Los análisis de los contenidos estomacales de 226 ejemplares indicaron una dieta con predominio de Ocypodidae y Grapsidae. Las estrategias alimentarías de S. herzbergii mostraron pequeñas diferencias entre las dietas de los adultos y de los jóvenes, pero la variación estacional fue el factor que mejor definió la diversificación de la dieta. En el período seco hubo un comportamiento oportunista en la alimentación, cambiando a una dieta mas especializada durante el período lluvioso. Esta variación temporal en la dieta corresponde con la variación estacional en los hábitats del canal de marea.

  14. Physical mapping of the 5S and 18S rDNA in ten species of Hypostomus Lacépède 1803 (Siluriformes: Loricariidae): evolutionary tendencies in the genus.

    Science.gov (United States)

    Bueno, Vanessa; Venere, Paulo César; Thums Konerat, Jocicléia; Zawadzki, Cláudio Henrique; Vicari, Marcelo Ricardo; Margarido, Vladimir Pavan

    2014-01-01

    Hypostomus is a diverse group with unclear aspects regarding its biology, including the mechanisms that led to chromosome diversification within the group. Fluorescence in situ hybridization (FISH) with 5S and 18S rDNA probes was performed on ten Hypostomini species. Hypostomus faveolus, H. cochliodon, H. albopunctatus, H. aff. paulinus, and H. topavae had only one chromosome pair with 18S rDNA sites, while H. ancistroides, H. commersoni, H. hermanni, H. regani, and H. strigaticeps had multiple 18S rDNA sites. Regarding the 5S rDNA genes, H. ancistroides, H. regani, H. albopunctatus, H. aff. paulinus, and H. topavae had 5S rDNA sites on only one chromosome pair and H. faveolus, H. cochliodon, H. commersoni, H. hermanni, and H. strigaticeps had multiple 5S rDNA sites. Most species had 18S rDNA sites in the telomeric region of the chromosomes. All species but H. cochliodon had 5S rDNA in the centromeric/pericentromeric region of one metacentric pair. Obtained results are discussed based on existent phylogenies for the genus, with comments on possible dispersion mechanisms to justify the variability of the rDNA sites in Hypostomus.

  15. Physical Mapping of the 5S and 18S rDNA in Ten Species of Hypostomus Lacépède 1803 (Siluriformes: Loricariidae: Evolutionary Tendencies in the Genus

    Directory of Open Access Journals (Sweden)

    Vanessa Bueno

    2014-01-01

    Full Text Available Hypostomus is a diverse group with unclear aspects regarding its biology, including the mechanisms that led to chromosome diversification within the group. Fluorescence in situ hybridization (FISH with 5S and 18S rDNA probes was performed on ten Hypostomini species. Hypostomus faveolus, H. cochliodon, H. albopunctatus, H. aff. paulinus, and H. topavae had only one chromosome pair with 18S rDNA sites, while H. ancistroides, H. commersoni, H. hermanni, H. regani, and H. strigaticeps had multiple 18S rDNA sites. Regarding the 5S rDNA genes, H. ancistroides, H. regani, H. albopunctatus, H. aff. paulinus, and H. topavae had 5S rDNA sites on only one chromosome pair and H. faveolus, H. cochliodon, H. commersoni, H. hermanni, and H. strigaticeps had multiple 5S rDNA sites. Most species had 18S rDNA sites in the telomeric region of the chromosomes. All species but H. cochliodon had 5S rDNA in the centromeric/pericentromeric region of one metacentric pair. Obtained results are discussed based on existent phylogenies for the genus, with comments on possible dispersion mechanisms to justify the variability of the rDNA sites in Hypostomus.

  16. An Unusual Accumulation of Ribosomal Multigene Families and Microsatellite DNAs in the XX/XY Sex Chromosome System in the Trans-Andean Catfish Pimelodella cf. chagresi (Siluriformes:Heptapteridae).

    Science.gov (United States)

    Conde-Saldaña, Cristhian Camilo; Barreto, Cynthia Aparecida Valiati; Villa-Navarro, Francisco Antonio; Dergam, Jorge Abdala

    2018-02-01

    This work constitutes the first cytogenetic characterization of a trans-Andean species of Heptapteridae. The catfish Pimelodella cf. chagresi from the Upper Rio Magdalena was studied, applying standard cytogenetic techniques (Giemsa, C-banding, and argyrophilic nucleolar organizer region [Ag-NOR]) and fluorescence in situ hybridization techniques using repetitive DNA probes: microsatellites (CA 15 and GA 15 ) and ribosomal RNA (rRNA) multigene families (18S and 5S recombinant DNA [rDNA] probes). The species showed a unique diploid chromosome number 2n = 50 (32m [metacentrics] +14sm [submetacentrics] +4st [subtelocentrics]) and a XX/XY sex chromosomal system, where the heteromorphic Y-chromosome revealed a conspicuous accumulation of all the assayed domains of repetitive DNA. P. cf. chagresi karyotype shares common features with other Heptapteridae, such as the predominance of metacentric and submetacentric chromosomes, and one pair of subtelomeric nucleolar organizer regions (NORs). These results reflect an independent karyological identity of a trans-Andean species and the relevance of repetitive DNA sequences in the process of sex chromosome differentiation in fish; it is the first case of syntenic accumulation of rRNA multigene families (18S and 5S rDNA) and microsatellite sequences (CA 15 and GA 15 ) in a differentiated sex chromosome in Neotropical fish.

  17. Effect of low ambient mineral concentrations on the accumulation of calcium, magnesium and phosphorus by early life stages of the air-breathing armoured catfish Megalechis personata (Siluriformes; Callichthyidae)

    NARCIS (Netherlands)

    Mol, J.H.; Atsma, W.; Flik, G.; Bouwmeester, H.; Osse, J.W.M.

    1999-01-01

    he accumulation of calcium, magnesium and phosphorus was measured during an 8-week period in the early life stages of the air-breathing armoured catfish Megalechis personata acclimated to low-mineral fresh water (0.073 mmol l-1 calcium, 0.015 mmol l-1 magnesium, <0.001 mmol l-1 phosphate) and

  18. Parotocinclus arandai, a new species of hypoptopomatine catfish (Siluriformes: Loricariidae from the upper rios Jucuruçu and Buranhém, States of Bahia and Minas Gerais, Brazil

    Directory of Open Access Journals (Sweden)

    Luisa Maria Sarmento-Soares

    Full Text Available Parotocinclus arandai, new species of the hypoptopomatine catfish, is described from small creeks in the upper rios Jucuruçu and Buranhém basins, at the border of Brazilian States of Bahia and Minas Gerais. Parotocinclus arandai is distinguished from all congeners from the Atlantic coastal basins of southeastern and eastern Brazil, except Parotocinclus bahiensis, by having the branched rays and interradial membranes of the pectoral and pelvic fins unpigmented in ventral view. The new species is distinguished from most Parotocinclus species, by having a small eye, 14.8-19.3 mm HL (except P. maculicauda and P. planicauda and by the presence of a tuft of hypertrophied odontodes on the supraoccipital (except P. cristatus and P. cesarpintoi. Parotocinclus arandai is further distinguished by having an abdomen extensively naked, with a mosaic of few rounded platelets of irregular size and distributed over the pre-anal region (except P. bahiensis, P. minutus, P. spilosoma, P. cearensis, P. cesarpintoi and P. prata. A detailed comparison with congeners on eastern Brazil hydrographical region is provided, and information on the species habitat is given.

  19. A morphological and molecular study of two species of Raphidascaroides Yamaguti, 1941 (Nematoda: Anisakidae), parasites of doradid catfish (Siluriformes) in South America, including description of R. moraveci n. sp

    Czech Academy of Sciences Publication Activity Database

    Pereira, F.B.; Tavares, L.E.R.; Scholz, Tomáš; Luque, J.L.

    2015-01-01

    Roč. 91, č. 1 (2015), s. 49-61 ISSN 0165-5752 R&D Projects: GA ČR GBP505/12/G112 Institutional support: RVO:60077344 Keywords : fishes * Ascaridoidea * phylogeny Subject RIV: EG - Zoology Impact factor: 1.316, year: 2015

  20. DIFERENCIAÇÃO MORFOLÓGICA ENTRE POPULAÇÕES DE Corydoras aeneus GILL (1858 (SILURIFORMES, CALLICHTHYIDAE EM RIACHOS DAS BACIAS HIDROGRÁFICAS DOS RIOS PARANÁ E PARAGUAI

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    Alexandro Cezar Floretnino

    2014-10-01

    Full Text Available No presente estudo analisamos a existência de diferenciação na morfologia de populações isoladas de Corydoras aeneus (Gill, 1858. Quatorze caracteres morfométricos foram utilizados para a avaliação na morfologia de 14 populações isoladas das bacias dos rios Paraná e Paraguai. Verificamos a existência de diferenciação morfológica com auxílio da Análise de Função Discriminante. Utilizamos o teste de Mantel para observar se existia relação entre a similaridade morfológica e a distância geográfica. Após, realizamos uma análise de  entre a similaridade morfológica e as características ambientais dos riachos. Constatamos, que existe diferença significativa na morfologia das espécies entre os locais (Wilk’s Lambda= 0,02; F(182,935= 1,92; p<0,001. Existe correlação significativa entre a morfologia das espécies e as características dos locais coletados (Mantel r= 0,62, p= 0,01. As diferenças na morfologia das populações foram congruentes com as diferenças nas características dos riachos estudados. Desta forma, ao longo do tempo evolutivo foram selecionados os indivíduos que apresentavam características que conferiam maior adaptação às características ambientais, independente da distância geográfica entre estas populações estudadas. Palavras-chave: variação geográfica, peixes, riachos, morfometria. DOI: http://dx.doi.org/10.18561/2179-5746/biotaamazonia.v4n3p95-99

  1. Diet and Circadian Rhythm of the Feeding Activity of Tamoatá Hoplosternum Littorale (Hancock, 1828 (Siluriformes, Callichthydae Captured In Vacacaí River, Rio Grande do Sul, Brazil

    Directory of Open Access Journals (Sweden)

    Éverton Luís Zardo

    2013-12-01

    Full Text Available This paper aims at contributing to biological and ecological knowledge about Hoplosternum littorale by studying its diet in the Vacacaí River, RS. With this aim, samples were taken in all seasons in four points selected along the Vacacaí River, using gill nets with meshes 1.5, 2.0, 2.5, 3.0, 4.0; 5.0, 6.0 and 8.0 cm between adjacent knots. The nets remained in the water for 24 hours, being revised every six hours. The fish which was caught was fixed in 10% formalin and later preserved in 70% alcohol. The specimens were weighed, measured and had the digestive tract removed for diet analysis. The items found in stomach contents were separated into six categories: Insects, Mollusks, Detritus/Silt, Vegetables, Scales and Nematodes, each category being analyzed by frequency of occurrence and volumetric method, being combined to obtain the Feeding Index" (IAi. The stomach repletion index (SRI and Repletion Index (RI were also estimated to assess the feeding activity according to the circadian rhythm. The most important items in the diet of this species according to IAi were insects, sediment and plant. H. littorale showed greater feeding activity in early morning, coinciding with greater capture also in reviewing this time, suggesting a nocturnal activity.

  2. Preliminary data on the feeding habits of the endemic species Synodontis koensis Pellegrin, 1933 (Siluriformes, Mochokidae in a West African River (Sassandra River Basin, Côte d’Ivoire

    Directory of Open Access Journals (Sweden)

    Yao S.S.

    2010-06-01

    Full Text Available In the implementation of programs for protection and management of ichthyofauna, endemic species should have high priority in the conservation measures. Their fishery should be based on intimate knowledge of their ecology and biology. Feeding habits of the endemic Mochokid Synodontis koensis were assessed in the Sassandra River (Côte d’Ivoire in relation to the study zone, the specimen sex and size, and the season. Of the 303 stomachs examined, 49 were empty (16%. The fluctuation of the vacuity index indicated that S. koensis feeds more at night. The diet consisted mainly of plant detritus and chironomid larvae. The statistical analysis of the feeding according to the study zones, the sex of fish and the seasons does not show any significant difference between regimes, whereas significant ontogenic shifts in diet were observed.

  3. Revision of the amphiamerican Neotetraonchus BravoHollis,1968(Monogenoidea:Dactylogyridae),with a description of N. vegrandis n. sp from the gill lamellae of the blue sea catfish Ariopsis guatemalensis(Siluriformes:Ariidae)off the Pacific Coast of Mexico

    Czech Academy of Sciences Publication Activity Database

    Kritsky, D. C.; Mendoza-Franco, Edgar F.; Bullard, S. A.; Vidal-Martínez, V. M.

    2009-01-01

    Roč. 74, č. 1 (2009), s. 1-15 ISSN 0165-5752 Institutional research plan: CEZ:AV0Z60220518 Keywords : Monogenea * Dactylogyridae * catfish es * morphology * morphology * Pacific Ocean * Panama Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 0.911, year: 2009

  4. Some new species of Caryospora (Apicomplexa: Eimeriidae from brazilian snakes, and a re-description of C. jararacae Carini, 1939

    Directory of Open Access Journals (Sweden)

    Ralph Lainson

    1991-09-01

    Full Text Available The mature ooxysts of six new species of Caryospora are described from the faeces of Brazilian snakes. They are differentiated from other species previously recorded from reptiles, largely on the size and shape of the oocyst and sporocyst, structure of the oocyst wall, and presence or absence of a polar body. C. paraensis n. sp., and C. carajasensis n. sp., are from the "false coral", Oxyrhopus petola digitalis; C. pseustesi n. sp., from the "egg-eater", Pseustes sulphureus sulphureus; C. epicratesi n. sp., from the "red boa", Epicrates cenchria cenchria; and C. micruri n. sp., and C. constancieae n. sp., from the "coral snake", Micrurus spixii spixii. A re-description is given of C. jararacae Carini, 1939, from the "jararaca" Bothrops atrox, embodying some additional morphological features.

  5. Distribution of fish assemblages in Lajes Reservoir, Rio de Janeiro, Brazil

    Directory of Open Access Journals (Sweden)

    F. G. ARAÚJO

    Full Text Available Spatial distribution of fish assemblages in Lajes Reservoir, a 30 km² impoundment in Rio de Janeiro State (Lat. 22º42'-22º50'S; Long. 43º53'-44º05'W was assessed to detect patterns of available habitat use by the fish. A standardized monthly sampling program was carried out from January to December 1994 at three zones of the reservoir (upper, near tributary mouths; middle; and lower, near the dam. Fishes were caught by gillnets, (50 m long, 3 m height, with mesh ranging having from 25 to 45 mm between knots, submerged during 12 hours. A total of 5,089 fishes were collected comprising 15 species, 14 genera and 9 families. Loricariichthys spixii, Astyanax bimaculatus, Parauchenipterus striatulus, Astyanax fasciatus parahybae, Oligosarchus hepsetus, Rhamdia parahybae, Hypostomus affinis, and Geophagus brasiliensis were the most abundant species, each contributing above 1% of the total number. Loricariichthys spixii was the dominant species, contributing over 80% of total number and biomass. Fish abundance, number of species, and biomass were higher in the upper zone, but differences from this overall pattern were shown by some species. Loricariichthys spixii and Rhamdia parahybae were more abundant in the upper zone, while all other species showed no differences in their abundance among the zones. Seasonal environmental variables of temperature, pH, transparency, and water level did not show a clear association with fish occurrence. Most fish used the different zones of the reservoir with no clear sign of spatial separation. High dominance of L. spixii, reduced abundance of reolific species Leporinus copelandii and Cyphocharax gilberti, and presence of introduced species such as Cichla monoculus and Tilapia rendalli are indications of antropic effects in the fish community.

  6. Evaluation of mercury, selenium and methylmercury in fish consumed by Santos Bay communities, Sao Paulo, Brazil

    Energy Technology Data Exchange (ETDEWEB)

    Farias, Luciana A.; Favaro, Deborah I.T. [Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil)]. E-mail: lufarias@usp.br; Azevedo, Juliana de S.; Braga, Elisabete S. [Sao Paulo Univ., SP (Brazil). Inst. Oceanografico. Lab. de Nutrientes, Micronutrientes e Tracos no Mar (LABNUT)]. E-mail: juliana@io.usp.br

    2005-07-01

    In the present study, mercury and selenium levels were evaluated in fish tissues and fish organs in the Santos Bay, Sao Paulo State, southeastern Brazil. Santos Bay waters are polluted by the large industrial complex of Cubatao. The estuary system filters part of this pollution before it reaches the Bay. Mercury and methylmercury determination were performed using Cold Vapor Atomic Absorption Spectrometry (CV-AAS) and selenium determination by Instrumental Neutron Activation Analysis (INAA). Methodology validation for the determination of these elements was carried out by means of reference materials analyses. There was no significant correlation between mercury and selenium concentrations (n = 17, (r2 ) R2 = 0.3482, p = 0.1709) in Cathorops spixii (bagre amarelo)- Ariidae family and Centropomus sp. (robalo)- Centropomidae family livers. Mercury and methylmercury concentrations in muscle from carnivorous species: Ariidae Cathorops spixii (bagre amarelo), Scianidae Steliffer rastifer (cangoa) and Scianidae Paralonchurus brasiliensis (maria-luiza) were determined and discussed. Total mercury concentration in Ariidae Catharops spixii livers presented the highest Hg level (7.6 mg kg-1). Although the Santos Bay is less contaminated than the inner section of its estuary system (Cubatao), it presents signs of environmental impact. (author)

  7. Evaluation of mercury, selenium and methylmercury in fish consumed by Santos Bay communities, Sao Paulo, Brazil

    International Nuclear Information System (INIS)

    Farias, Luciana A.; Favaro, Deborah I.T.; Azevedo, Juliana de S.; Braga, Elisabete S.

    2005-01-01

    In the present study, mercury and selenium levels were evaluated in fish tissues and fish organs in the Santos Bay, Sao Paulo State, southeastern Brazil. Santos Bay waters are polluted by the large industrial complex of Cubatao. The estuary system filters part of this pollution before it reaches the Bay. Mercury and methylmercury determination were performed using Cold Vapor Atomic Absorption Spectrometry (CV-AAS) and selenium determination by Instrumental Neutron Activation Analysis (INAA). Methodology validation for the determination of these elements was carried out by means of reference materials analyses. There was no significant correlation between mercury and selenium concentrations (n = 17, (r2 ) R2 = 0.3482, p = 0.1709) in Cathorops spixii (bagre amarelo)- Ariidae family and Centropomus sp. (robalo)- Centropomidae family livers. Mercury and methylmercury concentrations in muscle from carnivorous species: Ariidae Cathorops spixii (bagre amarelo), Scianidae Steliffer rastifer (cangoa) and Scianidae Paralonchurus brasiliensis (maria-luiza) were determined and discussed. Total mercury concentration in Ariidae Catharops spixii livers presented the highest Hg level (7.6 mg kg-1). Although the Santos Bay is less contaminated than the inner section of its estuary system (Cubatao), it presents signs of environmental impact. (author)

  8. Brasacanthus sphoeroides gen. n., sp. n. (Acanthocephala, Echinorhynchidae from a coastal marine fish of Paraná State, Brazil

    Directory of Open Access Journals (Sweden)

    Vernon E. Thatcher

    2001-12-01

    Full Text Available Brasacanthus sphoeroides gen. n.. sp. n. is described from the marine fish, Sphoeroides greeleyi (Steindachner, taken in Paranaguá Bay, Paraná State, Brazil. The new genus differs from Acanthocephalus Koelreuter, 1771, the nearest genus in the family Echinorhynchidae, by having very flat and variable lemnisci in both sexes and a uterine egg reservoir in the female. The species is characterized by its spherical body form and in having parallel or diagonal testes.

  9. Tapeworms (Cestoda: Proteocephalidea) of teleost fi shes from the Amazon River in Peru: additional records as an evidence of unexplored species diversity

    Czech Academy of Sciences Publication Activity Database

    de Chambrier, A.; Kuchta, Roman; Scholz, Tomáš

    2015-01-01

    Roč. 122, č. 1 (2015), s. 149-163 ISSN 0035-418X R&D Projects: GA ČR GBP505/12/G112 Institutional support: RVO:60077344 Keywords : Catfish * freshwater fish * Siluriformes * Peru * Pimelodidae * Amazonia * species diversity * faunal survey Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 0.431, year: 2015

  10. Miocene fish faunas from the northwestern Amazonia basin (Colombia, Peru, Brazil) with evidence of marine incursions

    NARCIS (Netherlands)

    Monsch, KA

    1998-01-01

    New evidence indicates marine influences during the Miocene in the northwestern Amazonia basin. This is the first major survey of the ichthyofauna from this area in the Miocene. Fossil fish remains from taxa such as the Dasyatoidea, Myliobatoidea, Characiformes, Siluriformes and Sciaenidae are

  11. Higher and lower-level relationships of the deep-sea fish order Alepocephaliformes (Teleostei: Otocephala) inferred from whole mitogenome sequences

    DEFF Research Database (Denmark)

    Poulsen, Jan Yde; Møller, Peter Rask; Lavoué, Sébastien

    2009-01-01

    , Cypriniformes, Characiformes, Siluriformes and Gymnotiformes). The disputed family Bathylaconidae was found to be an artificial assemblage of the two genera Bathylaco and Herwigia, with the former as the sister group of the family Alepocephalidae and the latter nested within Alepocephalidae. Platytroctidae...

  12. Cytotaxonomic and evolutionary considerations about karyotipic data of fishes from the Iguaçu River Basin in South of Brazil

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    Daniel Luis Zanella Kantek

    2007-09-01

    Full Text Available The cytogenetic data available in the literature about the ichthyofauna of the Iguaçu River basin were analyzed in this review. The ichthyofauna was characterized by the high level of endemism and by the low diversity of species. Twenty-four of the eighty-one species were already karyotyped; six Characiformes, fourteen Siluriformes and four Perciformes. The chromosomal data showed the taxonomic and systematic complexity of the groups. Hypothesis related to the evolution of some Characiformes and Siluriformes groups from the Iguaçu River are proposed, as well as the utilization of karyotypic data for cytotaxonomy.Nesta revisão são analisados os dados citogenéticos disponíveis na literatura relativos à ictiofauna da bacia do Rio Iguaçu, a qual é caracterizada pelo alto grau de endemismo e pela baixa diversidade de espécies. Das oitenta e uma espécies conhecidas, vinte e quatro já foram cariotipadas sendo 6 Characiformes, 14 Siluriformes e 4 Perciformes. Os dados cromossômicos evidenciam a complexidade taxonômica e sistemática dos grupos. São propostas hipóteses relacionadas à evolução de alguns grupos de Characiformes e Siluriformes do Rio Iguaçu, assim como o aproveitamento de dados cariotípicos para a citotaxonomia.

  13. Coralsnake Venomics: Analyses of Venom Gland Transcriptomes and Proteomes of Six Brazilian Taxa.

    Science.gov (United States)

    Aird, Steven D; da Silva, Nelson Jorge; Qiu, Lijun; Villar-Briones, Alejandro; Saddi, Vera Aparecida; Pires de Campos Telles, Mariana; Grau, Miguel L; Mikheyev, Alexander S

    2017-06-08

    Venom gland transcriptomes and proteomes of six Micrurus taxa ( M. corallinus , M. lemniscatus carvalhoi , M. lemniscatus lemniscatus , M. paraensis , M. spixii spixii , and M. surinamensis ) were investigated, providing the most comprehensive, quantitative data on Micrurus venom composition to date, and more than tripling the number of Micrurus venom protein sequences previously available. The six venomes differ dramatically. All are dominated by 2-6 toxin classes that account for 91-99% of the toxin transcripts. The M. s. spixii venome is compositionally the simplest. In it, three-finger toxins (3FTxs) and phospholipases A₂ (PLA₂s) comprise >99% of the toxin transcripts, which include only four additional toxin families at levels ≥0.1%. Micrurus l. lemniscatus venom is the most complex, with at least 17 toxin families. However, in each venome, multiple structural subclasses of 3FTXs and PLA₂s are present. These almost certainly differ in pharmacology as well. All venoms also contain phospholipase B and vascular endothelial growth factors. Minor components (0.1-2.0%) are found in all venoms except that of M. s. spixii . Other toxin families are present in all six venoms at trace levels (venom components differ in each venom. Numerous novel toxin chemistries include 3FTxs with previously unknown 8- and 10-cysteine arrangements, resulting in new 3D structures and target specificities. 9-cysteine toxins raise the possibility of covalent, homodimeric 3FTxs or heterodimeric toxins with unknown pharmacologies. Probable muscarinic sequences may be reptile-specific homologs that promote hypotension via vascular mAChRs. The first complete sequences are presented for 3FTxs putatively responsible for liberating glutamate from rat brain synaptosomes. Micrurus C-type lectin-like proteins may have 6-9 cysteine residues and may be monomers, or homo- or heterodimers of unknown pharmacology. Novel KSPIs, 3× longer than any seen previously, appear to have arisen in three

  14. Coralsnake Venomics: Analyses of Venom Gland Transcriptomes and Proteomes of Six Brazilian Taxa

    Directory of Open Access Journals (Sweden)

    Steven D. Aird

    2017-06-01

    Full Text Available Venom gland transcriptomes and proteomes of six Micrurus taxa (M. corallinus, M. lemniscatus carvalhoi, M. lemniscatus lemniscatus, M. paraensis, M. spixii spixii, and M. surinamensis were investigated, providing the most comprehensive, quantitative data on Micrurus venom composition to date, and more than tripling the number of Micrurus venom protein sequences previously available. The six venomes differ dramatically. All are dominated by 2–6 toxin classes that account for 91–99% of the toxin transcripts. The M. s. spixii venome is compositionally the simplest. In it, three-finger toxins (3FTxs and phospholipases A2 (PLA2s comprise >99% of the toxin transcripts, which include only four additional toxin families at levels ≥0.1%. Micrurus l. lemniscatus venom is the most complex, with at least 17 toxin families. However, in each venome, multiple structural subclasses of 3FTXs and PLA2s are present. These almost certainly differ in pharmacology as well. All venoms also contain phospholipase B and vascular endothelial growth factors. Minor components (0.1–2.0% are found in all venoms except that of M. s. spixii. Other toxin families are present in all six venoms at trace levels (<0.005%. Minor and trace venom components differ in each venom. Numerous novel toxin chemistries include 3FTxs with previously unknown 8- and 10-cysteine arrangements, resulting in new 3D structures and target specificities. 9-cysteine toxins raise the possibility of covalent, homodimeric 3FTxs or heterodimeric toxins with unknown pharmacologies. Probable muscarinic sequences may be reptile-specific homologs that promote hypotension via vascular mAChRs. The first complete sequences are presented for 3FTxs putatively responsible for liberating glutamate from rat brain synaptosomes. Micrurus C-type lectin-like proteins may have 6–9 cysteine residues and may be monomers, or homo- or heterodimers of unknown pharmacology. Novel KSPIs, 3× longer than any seen

  15. Utilização das brânquias de Pimelodus maculatus (Lacèpéde, 1803 (Siluriformes; Pimelodidae como biomarcador de poluição no reservatório da UHE Marechal Mascarenhas de Moraes, Minas Gerais, Brasil.

    Directory of Open Access Journals (Sweden)

    Diego José Nogueira

    2011-07-01

    Full Text Available http://dx.doi.org/10.5007/2175-7925.2011v24n3p51 As brânquias dos peixes são biomarcadores da toxicidade ambiental que, frequentemente, são utilizados na avaliação dos impactos causados por xenobióticos. O presente estudo visa avaliar a contaminação do reservatório Marechal Mascarenhas de Moraes, através da estimativa do índice de alterações morfológicas nas brânquias do Pimelodus maculatus causadas por agentes tóxicos. Os exemplares de P. maculatus foram co­letados em três pontos do reservatório da UHE Marechal Mascarenhas de Moraes. No próprio local de coleta, imediatamente, as brânquias dos indivíduos coletados foram retiradas e fixadas com Bouin. Estas foram coradas com Hematoxilina-Eosina para análise em microscopia de luz. A quantificação das alterações foi realizada por estereologia, e os índices das alterações foram estimados, classificando-se as lesões de moderado a graves nos três pontos de estudo.

  16. Espermiogênese em Eupemphix nattereri (Anura, Leiuperidae: aspectos ultra-estruturais Spermiogenesis in Eupemphix nattereri (Anura, Leiuperidae: ultrastructural aspects

    Directory of Open Access Journals (Sweden)

    Rodrigo Zieri

    2008-06-01

    Full Text Available A maturação dos espermatozóides envolve um extenso e complexo processo que começa com a proliferação e diferenciação das espermatogônias, passa pela meiose e finaliza com a espermiogênese. Nessa fase, eventos envolvendo alterações morfológicas e bioquímicas transformam espermátides em espermatozóides. Aspectos ultra-estruturais da espermiogênese e do espermatozóide do anuro Eupemphix nattereri (Steindachner, 1863 foram analisados através de microscopia eletrônica de transmissão. A espermiogênese envolve condensação da cromatina e alongamento nuclear, com visível eliminação de citoplasma. Nesse estágio, grande quantidade de microtúbulos e glicogênio podem ser visualizados no citoplasma das células de Sertoli, rodeando cada espermátide. O espermatozóide é fusiforme e o acrossomo forma uma capa na região anterior do núcleo. A bainha mitocondrial é encontrada ao redor da porção proximal da cauda. A cauda apresenta o axonema com o modelo 9+2, uma fibra axonemal, a membrana ondulante e ausência de bastão axial. Esta organização apresenta algumas similaridades com espécies do gênero Physalaemus (Leiuperidae como P. biligonigerus (Cope, 1861, P. gracilis (Boulenger, 1883 e P. fuscomaculatus (Steindachner, 1864.Spermatozoon maturation involves an extense and complex process beginning with proliferation and differentiation of spermatogonia, passing through meiosis, and ending with spermiogenesis. The later event involves morphological and biochemical changes in order to transform spermatids into spermatozoa. Ultrastructural aspects of the spermiogenesis and testicular spermatozoa of the anuran Eupemphix nattereri (Steindachner, 1863 were analyzed by transmission electron microscopy. Spermiogenesis involves chromatin condensation and nuclear elongation, with visible cytoplasmic elimination. At this stage, a large amount of microtubules and glycogen can also be seen in Sertoli cell cytoplasm, surrounding each

  17. New data on species of Demidospermus (Dactylogyridae: Monogenea) parasitizing fishes from the reservoir of the Itaipu Hydroelectric Power Station, Paraná State, Brazil, with new synonymies.

    Science.gov (United States)

    Cohen, Simone C; Kohn, Anna

    2008-01-01

    Eight known species of Demidospermus (Dactylogyridae, Monogenea) were collected from siluriform fishes from reservoir of the Itaipu Hydroelectric Power Station, Paraná, Brazil. Four of them are recorded for the first time in Brazil, enlarging their geographical distribution: Demidospermus armostus, Demidospermus anus, Demidospermus bidiverticulatum and Demidospermus valenciennesi. Demidospermus labrosi is synonymized with Demidospermus cornicinus and Demidospermus mandi with Demidospermus leptosynophallus and reported from two new hosts. Demidospermus paravalenciennesi and Demidospermus uncusvalidus were also collected.

  18. Ichthyofaunal Diversity and Water Quality in the Kangsabati Reservoir, West Bengal, India

    OpenAIRE

    Amalesh Bera; Manojit Bhattacharya; Bidhan Chandra Patra; Utpal Kumar Sar

    2014-01-01

    The ichthyofauna in relation to water quality was studied on monthly basis from March, 2010 to February, 2011 in the Kangsabati Reservoir, West Bengal. The study revealed that physicochemical parameters of Kangsabati Reservoir were congenial for 39 fish species of commercial importance, belonging to 7 orders, 15 families, and 26 genera. The Cypriniformes were dominant with 17 species, followed by Siluriformes and Perciformes, with 7 species each, Channiformes with 3 species, Osteoglossifor...

  19. Genetic structure in the Amazonian catfish Brachyplatystoma rousseauxii : influence of life history strategies

    OpenAIRE

    Carvajal-Vallejos, F. M.; Duponchelle, Fabrice; Desmarais, E.; Cerqueira, F.; Quérouil, Sophie; Nunez Rodriguez, Jesus; Garcia, C.; Renno, Jean-François

    2014-01-01

    The Dorado or Plateado (Gilded catfish) Brachyplatystoma rousseauxii (Pimelodidae, Siluriformes) is a commercially valuable migratory catfish performing the largest migration in freshwaters: from the Amazonian headwaters in the Andean foothills (breeding area) to the Amazon estuary (nursery area). In spite of its importance to inform management and conservation efforts, the genetic variability of this species has only recently begun to be studied. The aim of the present work was to determine ...

  20. Diel variation of larval fish abundance in the Amazon and Rio Negro

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    ARAUJO-LIMA C. A. R. M.

    2001-01-01

    Full Text Available Many streams and large rivers present higher ichthyoplankton densities at night. However, in some rivers this does not occur and larvae are equally abundant during the day. Larval drift diel variation is an important information for planning sampling programs for evaluating larval distribution and production. The aim of this study was to test whether the abundance of larval fish was different at either period. We tested it by comparing day and night densities of characiform, clupeiform and siluriform larvae during five years in the Amazon and one year in Rio Negro. We found that larvae of three species of characiform and larvae of siluriform were equally abundant during day and night in the Amazon. Conversely, the catch of Pellona spp. larvae was significantly higher during the day. In Rio Negro, however, larval abundance was higher during the night. These results imply that day samplings estimate adequately the abundance of these characiform and siluriform larvae in the Amazon, but not Pellona larvae. Evaluations of larved densities of Rio Negro will have to consider night sampling.

  1. Diel variation of larval fish abundance in the Amazon and Rio Negro

    Directory of Open Access Journals (Sweden)

    C. A. R. M. ARAUJO-LIMA

    Full Text Available Many streams and large rivers present higher ichthyoplankton densities at night. However, in some rivers this does not occur and larvae are equally abundant during the day. Larval drift diel variation is an important information for planning sampling programs for evaluating larval distribution and production. The aim of this study was to test whether the abundance of larval fish was different at either period. We tested it by comparing day and night densities of characiform, clupeiform and siluriform larvae during five years in the Amazon and one year in Rio Negro. We found that larvae of three species of characiform and larvae of siluriform were equally abundant during day and night in the Amazon. Conversely, the catch of Pellona spp. larvae was significantly higher during the day. In Rio Negro, however, larval abundance was higher during the night. These results imply that day samplings estimate adequately the abundance of these characiform and siluriform larvae in the Amazon, but not Pellona larvae. Evaluations of larved densities of Rio Negro will have to consider night sampling.

  2. Composición de especies y diversidad de peces en tres cuerpos de agua en la cuenca alta del río Itaya

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    Javier del Águila Chávez

    2013-06-01

    Full Text Available En el presente trabajo se describe sobre la diversidad en tres cuerpos de agua de la cuenca alta del río Itaya, concesión de conservación de la universidad científica del Perú, en una evaluación rápida en los meses de junio y julio del 2012. Se colectaron datos y muestras de peces en Lamas cocha (LC, cocha Anguilla (CA y Tipishca Luz de Oriente (TLO. Los peces fueron colectados utilizando una batería de redes de diferentes medidas 1.5, 2, 2.5, 3, 3.5 y 4 pulgadas de de abertura de malla. Se reportan 17 familias taxonómicas, de las cuales 9 familias pertenecen al orden Characiformes (53%, 3 familias pertenecen al orden de los Siluriformes (17%, 2 familias pertenecen al orden de los Gymnotiformes (12% y al orden Perciformes (12% y una familia pertenece al orden Beloniformes (6%. La predominancia de las familias taxonómicas en los tres ambientes fueron Characidae, Curimatidae, Acestrorhynchidae (Characiformes y Cichlidae (Perciformes. Sin embargo, la ocurrencia de exclusividad de una determinada familia fue observada en los tres cuerpos de aguas; tenemos de esta forma la familia Hemiodontidae solo tienen ocurrencia en Lamas cocha, la ocurrencia de la familia Prochilodontidae (Characiformes y Callichthyidae (Siluriformes en Cocha Anguillal y finalmente la ocurrencia de las familias Pimelodidae (Siluriformes, Sciaenidae (Perciformes y Belonidae (Beloniformes en la Tipishca Luz de Oriente.

  3. Composición de especies y diversidad de peces en tres cuerpos de agua en la cuenca alta del río Itaya

    Directory of Open Access Journals (Sweden)

    Javier del Águila Chávez

    2013-06-01

    Full Text Available En el presente trabajo se describe sobre la diversidad en tres cuerpos de agua de la cuenca alta del río Itaya, concesión de conservación de la universidad científica del Perú, en una evaluación  rápida en los meses de junio y julio del 2012. Se colectaron datos y muestras de peces en Lamas cocha (LC, cocha Anguilla (CA y Tipishca Luz de Oriente (TLO. Los peces fueron colectados utilizando una batería de redes de diferentes medidas 1.5, 2, 2.5, 3, 3.5 y 4 pulgadas de de abertura de malla. Se reportan 17 familias taxonómicas, de las cuales 9 familias pertenecen al orden Characiformes (53%, 3 familias pertenecen al orden de los Siluriformes (17%, 2 familias pertenecen al orden de los Gymnotiformes (12%  y al orden Perciformes (12% y una familia pertenece al orden Beloniformes (6%. La predominancia de las familias taxonómicas en los tres ambientes fueron Characidae, Curimatidae, Acestrorhynchidae (Characiformes y Cichlidae (Perciformes. Sin embargo, la ocurrencia de exclusividad de una determinada familia fue observada en los tres cuerpos de aguas; tenemos de esta forma la familia Hemiodontidae solo tienen ocurrencia en Lamas cocha, la ocurrencia de la familia Prochilodontidae (Characiformes y Callichthyidae (Siluriformes en Cocha Anguillal y finalmente la ocurrencia de las familias Pimelodidae (Siluriformes, Sciaenidae (Perciformes y Belonidae (Beloniformes en la Tipishca Luz de Oriente.

  4. Comparative analysis of microsatellite variability in five macaw species (Psittaciformes, Psittacidae: application for conservation

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    Flavia T. Presti

    2011-01-01

    Full Text Available Cross-amplification was tested and variability in microsatellite primers (designed for Neotropical parrots compared, in five macaw species, viz., three endangered blue macaws (Cyanopsitta spixii [extinct in the wild], Anodorhynchus leari [endangered] and Anodorhynchus hyacinthinus [vulnerable], and two unthreatened red macaws (Ara chloropterus and Ara macao. Among the primers tested, 84.6% successfully amplified products in C. spixii, 83.3% in A. leari, 76.4% in A. hyacinthinus, 78.6% in A. chloropterus and 71.4% in A. macao. The mean expected heterozygosity estimated for each species, and based on loci analyzed in all the five, ranged from 0.33 (A. hyacinthinus to 0.85 (A. macao. As expected, the results revealed lower levels of genetic variability in threatened macaw species than in unthreatened. The low combined probability of genetic identity and the moderate to high potential for paternity exclusion, indicate the utility of the microsatellite loci set selected for each macaw species in kinship and population studies, thus constituting an aid in planning in-situ and ex-situ conservation.

  5. Plastic debris ingestion by marine catfish: an unexpected fisheries impact.

    Science.gov (United States)

    Possatto, Fernanda E; Barletta, Mário; Costa, Monica F; do Sul, Juliana A Ivar; Dantas, David V

    2011-05-01

    Plastic marine debris is a pervasive type of pollution. River basins and estuaries are a source of plastics pollution for coastal waters and oceans. Estuarine fauna is therefore exposed to chronic plastic pollution. Three important catfish species [Cathorops spixii (N=60), Cathorops agassizii (N=60) and Sciades herzbergii (N=62)] from South Western Atlantic estuaries were investigated in a tropical estuary of the Brazilian Northeast in relation to their accidental ingestion of plastic marine debris. Individuals from all three species had ingested plastics. In C. spixii and C. agassizii, 18% and 33% of individuals had plastic debris in their stomachs, respectively. S. herzbergii showed 18% of individuals were contaminated. All ontogenetic phases (juveniles, sub-adults and adults) were contaminated. Nylon fragments from cables used in fishery activities (subsistence, artisanal and commercial) played a major role in this contamination. These catfish spend their entire life cycles within the estuary and are an important feeding resource for larger, economically important, species. It is not yet possible to quantify the scale and depth of the consequences of this type of pollution. However, plastics are well known threat to living resources in this and other estuaries. Conservation actions will need to from now onto take plastics pollution into consideration. Copyright © 2011 Elsevier Ltd. All rights reserved.

  6. Development of the inverted visceral yolk sac in three species of caviids (Rodentia, Caviomorpha, Caviidae).

    Science.gov (United States)

    Miglino, M A; Franciolli, A L R; de Oliveira, M F; Ambrósio, C E; Bonatelli, M; Machado, M R F; Mess, A

    2008-08-01

    Guinea pig related rodents possess numerous derived placental characters. We attempt to identify diversity within the visceral yolk sac and its association with the chorioallantoic placenta in three species of caviids, two of them possessing a capsule formed by the decidua that covers the chorioallantoic placenta. The results verify that in early pregnancy all three species have an inverted yolk sac placenta. In advanced pregnancy the species differ: Galea spixii, as representative without a capsule, bear a yolk sac in apposition to the chorioallantoic placenta with signs of exchange activity until term. Galea is similar to other caviomorphs in this respect. In Dasyprocta leporina and Cuniculus paca, the representatives possessing a capsule, the yolk sac endoderm lacks signs of substance exchange. Evidently, the presence of a capsule prevents such an interaction. The variations established here must be considered if animal models for human placentation are required which have restricted access to the chorioallantoic placenta from the outside.

  7. Diel variation in fish assemblages in tidal creeks in southern Brazil

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    JF. Oliveira-Neto

    Full Text Available Tidal creeks are strongly influenced by tides and are therefore exposed to large differences in salinity and depth daily. Here we compare fish assemblages in tidal creeks between day and night in two tidal creeks in southern Brazil. Monthly day and night, simultaneous collections were carried out in both creeks using fyke nets. Clupeiformes tended to be caught more during the day. Cathorops spixii, Genidens genidens and Rypticus randalli tended to be caught at night. Sciaenidae also tended to be caught more during the night. In general, pelagic species were diurnal, while deep water species were nocturnal. These trends are probably due to a variety of causes, such as phylogeny, predation and net avoidance.

  8. Epidemiologia da doença de Chagas no Ceará VIII - estudo da infecção de animais por T. cruzi no município de Morada Nova

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    J. E. Alencar

    1977-02-01

    Full Text Available Foram examinados 1.368 mamíferos em ecótopos naturais ou artificiais: 443 cães com 2,5% positivos; 605 gatos com 0,7%, 65 roedores domésticos com 4,6%, 6 coelhos e 10 cobaias negativos. Dentre os animais silvestres, foram examinados 115 preás (Galea s. spixii com 2,3% positivos, 12 "cassacos" (Didelphis azarae dos quais 9 positivos; 5 quirópteros, 5 punáres (Cercomys c. laurentius e 3 pebas (Dasypus sexcinctus negativos. A amostra apresentada é suficiente para considerada a existência de ciclos doméstico e silvestre de T. cruzi na área estudada e considerada endêmica da Doença de Chagas.

  9. Noteworthy records of reptiles from natural open vegetation areas in plateau and coastal areas of the state of Santa Catarina, southern Brazil

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    Ivo Rohling Ghizoni-Jr.

    2009-09-01

    Full Text Available The composition and geographic distribution of reptiles in Santa Catarina are little known, particularly in the open areas of its plateau (covered with ombrophylous steppe and Atlantic littoral (coastal dunes with thin, low, and predominant herbaceous vegetation known as restinga. Aiming to contribute to the knowledge of reptiles that inhabit these areas, this paper presents sixteen records of previously unknown or uncommon species in Santa Catarina: Acanthochelys spixii, Anops kingii, Cnemidophorus lacertoides, C. vacariensis, Leptotyphlops munoai, Mastigodryas b. bifossatus, Tantilla aff. melanocephala, Atractus reticulatus, Gomesophis brasiliensis, Lygophis flavifrenatus, Oxyrhopus r. rhombifer, Phalotris reticulatus, Philodryas agassizii, Xenodon dorbignyi, Micrurus altirostris and Bothrops pubescens. Aspects of the distribution and conservation of these species are discussed briefly.

  10. Two new species of Creptotrema (Digenea: Allocreadiidae from South America Dos especies nuevas de Creptotrema (Digenea: Allocreadiidae de América del Sur

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    Stephen S. Curran

    2008-08-01

    Full Text Available Two new digenean species belonging in Creptotrema Travassos, Artigas and Pereira, 1928 are described from specimens stored in the invertebrate collection at the Museum of Natural History, Geneva, Switzerland. Creptotrema lamothei n. sp. is described from Ageneiosus brevifilis Valenciennes in Cuvier and Valenciennes, 1840 (Siluriformes: Ageneiosidae, Auchenipterus nuchalis (Spix and Agassiz, 1829 (Siluriformes: Auchenipteridae, and Bryconops melanurus (Bloch, 1794 (Characiformes: Characidae in the Paraguay River, Paraguay. Creptotrema sucumbiosa n. sp. is described from Tetragonopterus argenteus Cuvier, 1816 (Characiformes: Characidae in Río Aquarico, Ecuador. Creptotrema lamothei differs from its congeners by having testes with irregular rather than entire outlines. Creptotrema sucumbiosa differs from its congeners by having a bilobed rather than entire ovary. Both C. lamothei and C. sucumbiosa differ from their other congeners by having relatively longer posttesticular spaces in their bodies, representing 25-30% and 24-28% of body length respectively, compared with approximately 6-19% in other species.Dos especies nuevas de digéneos pertenecientes a Creptotrema Travassos, Artigas y Pereira, 1928 fueron descritas de ejemplares depositados en la colección de invertebrados del Museo de Historia Natural de Ginebra, Suiza. Creptotrema lamothei n. sp. fue descrita en Ageneiosus brevifilis Valenciennes in Cuvier y Valenciennes, 1840 (Siluriformes: Ageneiosidae, Auchenipterus nuchalis (Spix y Agassiz, 1829 (Siluriformes: Auchenipteridae, y Bryconops melanurus (Bloch, 1794 (Characiformes: Characidae en el río Paraguay, Paraguay. Creptotrema sucumbiosa n. sp. fue descrita de Tetragonopterus argenteus, Cuvier 1816 (Characiformes: Characidae en el río Aquarico, Ecuador. Creptotrema lamothei difiere de sus congéneres por tener testículos con contornos irregulares en contraste con los que presentan contornos enteros. Creptotrema sucumbiosa difiere de

  11. A new monozoic tapeworm, Lobulovarium longiovatum n. g., n. sp. (Cestoda: Caryophyllidea), from barbs Puntius spp. (Teleostei: Cyprinidae) in the Indomalayan region

    Czech Academy of Sciences Publication Activity Database

    Oros, Mikuláš; Ash, Anirban; Brabec, Jan; Kar, P. K.; Scholz, Tomáš

    2012-01-01

    Roč. 83, č. 1 (2012), s. 1-13 ISSN 0165-5752 R&D Projects: GA ČR GD206/09/H026; GA ČR GA524/08/0885; GA ČR GBP505/12/G112 Institutional research plan: CEZ:AV0Z60220518 Keywords : MIXED MODELS * SILURIFORMES * PARASITES * IDENTIFICATION * CATOSTOMIDAE * MORPHOLOGY * CESTOIDEA * REVISION * SOPHORE * PISCES Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 1.260, year: 2012 http://link.springer.com/article/10.1007%2Fs11230-012-9367-6

  12. The Histopathology of the Infection of Tilapia rendalli and Hypostomus regani (Osteichthyes by Lasidium Larvae of Anodontites trapesialis (Mollusca, Bivalvia

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    Ângela Teresa Silva-Souza

    2002-04-01

    Full Text Available It is described the histopathology of the infection of Tilapia rendalli (Osteichthyes, Perciformes, Cichlidae and Hypostomus regani (Osteichthyes, Siluriformes, Loricariidae by lasidium larvae of Anodontites trapesialis (Mollusca, Bivalvia, Mycetopodidae. The larvae were encysted within the epidermis of the host, being surrounded by a thin hyaline membrane, 3-6 µm thick, of parasite origin. A proliferative host cell reaction did not occur. The histopathology of the infection shows that the lesions induced by the parasites are minimal. However, the numerous small lesions produced by the release of the larvae may provide optimal conditions for the infection by opportunistic pathogens, namely fungus, which may eventually cause the death of the host.

  13. Revision of Gangesia (Cestoda: Proteocephalidea) in the Indomalayan Region: Morphology, Molecules and Surface Ultrastructure

    Czech Academy of Sciences Publication Activity Database

    Ash, Anirban; Scholz, Tomáš; de Chambrier, A.; Brabec, Jan; Oros, M.; Kar, P. K.; Chavan, S. P.; Mariaux, J.

    2012-01-01

    Roč. 7, č. 10 (2012), e46421 E-ISSN 1932-6203 R&D Projects: GA ČR GA524/08/0885; GA ČR GD206/09/H026; GA ČR GBP505/12/G112 Institutional support: RVO:60077344 Keywords : PHYLOGENETIC TREE SELECTION * APEWORMS PLATYHELMINTHES * SCOLEX MORPHOLOGY * CARYOPHYLLIDEA * EUCESTODA * SILURIFORMES * EVOLUTION Subject RIV: EB - Genetics ; Molecular Biology Impact factor: 3.730, year: 2012 http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0046421

  14. Fishes from the Itapecuru River basin, State of Maranhão, northeast Brazil

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    MC Barros

    Full Text Available The Itapecuru is a relatively large river in the northeastern Brazilian state of Maranhão. During several expeditions to this basin, we collected 69 fish species belonging to 65 genera, 29 families and 10 orders. Characiformes and Siluriformes were the orders with the largest number of species and Characidae, Loricariidae, Cichlidae, Auchenipteridae and Pimelodidae were the richest families. About 30% of the fish fauna of the Itapecuru basin is endemic or restricted to northeastern Brazil. Just over a fifth (22% of the species is also known to occur in the Amazon basin and only a few are more widely distributed in South American.

  15. Assembléia de peixes de um riacho da Floresta Atlântica: composição e distribuição espacial (Guaraqueçaba, Paraná, Brasil - DOI: 10.4025/actascibiolsci.v27i2.1326 Assemblage of freshwater fishes of Atlantic Forest: composition and spatial distribution (Guaraqueçaba, Paraná State, Brazil - DOI: 10.4025/actascibiolsci.v27i2.1326

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    José Marcelo Rocha Aranha

    2005-03-01

    Full Text Available No presente estudo, foram determinadas a composição e a distribuição espacial da assembléia de peixes do rio Morato no extremo nordeste do estado do Paraná. A coleta de dados foi realizada associando técnicas tradicionais a observações subaquáticas diretas. Após 12 fases mensais, foram registradas 30 espécies, distribuídas em 14 famílias, sendo Siluriformes (43% o grupo mais abundante e Ancistrus multispinnis, Phalloceros caudimaculatus, Deuterodon langei e Mimagoniates microlepis as espécies mais freqüentes. Characiformes e Perciformes apresentaram hábitos diurnos e a maioria dos Siluriformes apresentou hábitos noturnos. Characidium lanei, C. pterostictum e Rhamdioglanis frenatus ocorreram em todos os ambientes ao longo do trecho estudado. Quanto aos micro-habitats analisados, a ocupação pelas espécies foi predominante na porção inferior da coluna d'água no canal, em áreas com maiores profundidades, com substrato arenoso e com correnteza lenta. Os padrões de ocorrência e de distribuição encontrados foram variados, caracterizando a importância da análise do sistema de drenagem como um todo para conservação dessas populaçõesThe composition and space distribution of the fish assemblage of the Morato River (northeast of Paraná State, Brazil were determined in this study. Data collection was carried through associating traditional techniques of fishing and direct subaqueous observation with diving techniques. After 12 monthly sampling phases were registered 30 species in 14 families being Siluriformes (43% the group most abundant and Ancistrus multispinnis, Phalloceros caudimaculatus, Deuterodon langei and Mimagoniates microlepis the species most frequent. The Characiformes and Perciformes presented diurnal habits and the majority of the Siluriformes presented nocturnal habits. Characidium lanei, C. pterostictum and Rhamdioglanis frenatus occurred in all kind of environments on the studied stretch. In each kind of

  16. Morphological description of larvae of the Mapará Hypophthalmus edentatus (Spix (Osteichthyes, Hypophthalmidae in the Itaipu reservoir (Parana River, Brazil

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    Keshiyu Nakatani

    1998-01-01

    Full Text Available The ontogenetic aspects of larvae of Hypophthalmus edentatus (Spix, 1829 from the ichthyoplankton samples collected in the Itaipu reservoir between March 1988 and April 1990 were analysed. Sample were caught by 0.5 mm mesh conic-cylindrical plankton net. Larvae of H. edentatus were identified and described as Siluriforms from the morphological and morphometric development series. They have a small to medium-sized head, long body, small eyes, little pigmentation, mandibular barbules and 53 to 56 myomeres. High values obtained with correlation coefficient (r > 0.97; p < 0.001 show that growth was proportional in different parts of the body.

  17. Fish, Ribeirão do Feijão Basin, São Carlos, São Paulo, Brazil.

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    Silva-Souza, A. T.

    2008-01-01

    Full Text Available The Ribeirão do Feijão Basin is the main water supplier for the municipality of São Carlos, in the state of SãoPaulo, Brazil. Field work was carried out from February to November 2005, using sieves, casting nets, and drag nets. Atotal of 7,286 specimens of fish were collected, belonging to 30 species, 13 families and six orders. The richest orderwas Characiformes with 14 species, followed by Siluriformes with seven.

  18. Redescription of Corallobothrium solidum (Cestoda: Proteocephalidea) and erection of a new genus, Essexiella, for tapeworms from channel catfish (Ictaluridae)

    Czech Academy of Sciences Publication Activity Database

    Scholz, Tomáš; de Chambrier, A.; Mariaux, J.; Kuchta, Roman

    2011-01-01

    Roč. 97, č. 6 (2011), 1142–1151 ISSN 0022-3395 R&D Projects: GA ČR GA524/04/0342; GA ČR GA524/08/0885; GA AV ČR KJB600960902; GA MŠk LC522 Institutional research plan: CEZ:AV0Z60220518 Keywords : MALAPTERURUS-ELECTRICUS * PARASITE * SILURIFORMES * Eucestoda * MONTICELLIIDAE * FRITSCH * FISHES * MORPHOLOGY Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 1.405, year: 2011

  19. Domestic, peridomestic and wild hosts in the transmission of Trypanosoma cruzi in the Caatinga area colonised by Triatoma brasiliensis

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    Claudia Mendonça Bezerra

    2014-11-01

    Full Text Available The role played by different mammal species in the maintenance of Trypanosoma cruzi is not constant and varies in time and place. This study aimed to characterise the importance of domestic, wild and peridomestic hosts in the transmission of T. cruzi in Tauá, state of Ceará, Caatinga area, Brazil, with an emphasis on those environments colonised by Triatoma brasiliensis. Direct parasitological examinations were performed on insects and mammals, serologic tests were performed on household and outdoor mammals and multiplex polymerase chain reaction was used on wild mammals. Cytochrome b was used as a food source for wild insects. The serum prevalence in dogs was 38% (20/53, while in pigs it was 6% (2/34. The percentages of the most abundantly infected wild animals were as follows: Thrichomys laurentius 74% (83/112 and Kerodon rupestris 10% (11/112. Of the 749 triatomines collected in the household research, 49.3% (369/749 were positive for T. brasiliensis, while 6.8% were infected with T. cruzi (25/369. In captured animals, T. brasiliensis shares a natural environment with T. laurentius, K. rupestris, Didelphis albiventris, Monodelphis domestica, Galea spixii, Wiedomys pyrrhorhinos, Conepatus semistriatus and Mus musculus. In animals identified via their food source, T. brasiliensis shares a natural environment with G. spixii, K. rupestris, Capra hircus, Gallus gallus, Tropidurus oreadicus and Tupinambis merianae. The high prevalence of T. cruzi in household and peridomiciliar animals reinforces the narrow relationship between the enzootic cycle and humans in environments with T. brasiliensis and characterises it as ubiquitous.

  20. Metazoários parasitos de seis espécies de peixes do Reservatório de Lajes, Estado do Rio de Janeiro, Brasil Metazoan parasites of six fishes species from Lajes Reservoir in the State of Rio de Janeiro, Brazil

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    Aline R. Paraguassú

    2007-09-01

    Full Text Available Entre abril de 2002 e julho de 2003, foram necropsiados 231 espécimes de peixes: 39 Astyanax bimaculatus (Linnaeus, 1758, 79 A. fasciatus (Cuvier, 1819, 23 Hypostomus affinis (Steindachner, 1877, 26 Hoplias malabaricus (Bloch, 1794, 30 Loricariichthys castaneus (Castelnau, 1855 e 34 Trachelyopterus striatulus (Steindachner, 1876 provenientes do Reservatório de Lajes (22º42' - 22º50'S, 43º53' 44º05'O, Estado do Rio de Janeiro, Brasil, para estudo das suas comunidades parasitárias. A maioria dos espécimes de H. affinis (95,6% e H. malabaricus (84,6% estavam parasitados por pelo menos uma espécie de metazoário. Em A. bimaculatus, A. fasciatus, L. castaneus e T. striatulus 41%, 39,2%, 56,7% e 14,7% dos espécimes estavam parasitados, respectivamente. Foram coletadas oito diferentes espécies de metazoários parasitos: 2 em A. bimaculatus, 3 em A. fasciatus, 3 em H. affinis, 4 em H. malabaricus, 4 em L. castaneus e 1 em T. striatulus. As comunidades de metazoários parasitos das seis espécies de peixes estudadas apresentaram típico padrão de distribuição agregada. Foram observados dois casos de correlação negativa entre a abundância e a prevalência parasitárias e o comprimento total dos hospedeiros. A comunidade parasitária de L. castaneus apresentou os maiores valores de intensidade média, índice de dispersão e diversidade. As comunidades parasitárias dos peixes estudados apresentaram escassez de correlação entre a abundância, riqueza parasitária e diversidade com o comprimento total dos hospedeiros. Os baixos valores de riqueza e diversidade das comuni-dades parasitárias podem ser atribuídos as características oligotróficas do Reservatório de Lajes.From April 2002 to July 2003, 231 freshwater fishes from Lajes Reservoir in the State of Rio de Janeiro, Brazil (22º42' - 22º50'S, 43º53' - 44º05'W were necropsied to study their community metazoan parasites: 39 Astyanax bimaculatus (Linnaeus, 1758, 79 A. fasciatus

  1. Fish farming of native species in Colombia: current situation and perspectives

    DEFF Research Database (Denmark)

    Cruz-Casallas, P. E.; Medina-Robles, V. M.; Velasco-Santamaria, Y. M.

    2011-01-01

    . The Colombian pisciculture is based on red Tilapia Oreochromis sp. (Linnaeus), Rainbow trout Oncorhynchus mykiss (Walbaum) and cachama blanca Piaractus brachypomus (Cuvier), which currently represent around 96% of the total national production. The remaining 4% comes from other farmed species such as bocachico......In Colombia and the rest of the world, the decrease in capture fisheries production has turned the aquaculture into an alternative source of protein for the populations food security as well as an important productive activity, generating employment and income for the rural communities...... Prochilodus magdalenae (Steindachner), carp Cyprinus carpio (Linnaeus) and yamu Brycon amazonicus (Spix & Agassiz). From the three main fish species, cachama blanca is the only native species, which has shown excellent performance in pond farming due to its rusticity, omnivorous habits, docility, meat quality...

  2. On a New Species of Hysterothylacium (Nematoda: Anisakidae from Cauque mauleanum (Pisces: Atherinidae by Brightfield and Scanning Electron Microscopy

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    Torres Patricio

    1998-01-01

    Full Text Available Hysterothylacium geschei n. sp. (Nematoda, Anisakidae is described from the intestine of Cauque mauleanum (Steindachner (Pisces: Atherinidae from Lake Panguipulli (39º43'S; 72º13'W, Chile. Eleven (78.6% out of 14 fish were infected, with a mean intensity (range of 14.4 (1-55 worms. The new species can be differentiated from the two previously described species of freshwater fishes from South America by the presence of lateral alae, the number of caudal papillae, and the length of the spicules, oesophagus, intestinal caecum, distance vulva-anterior extremity and the length ratio intestinal caecum: ventricular appendix. From the fishes examined in Lake Panguipulli, including the introduced salmonid species Oncorhynchus mykiss (Walbaum and the authochthonous species Basilichthys australis Eigenmann (Atherinidae and Percichthys trucha (Valenciennes (Percichthyidae, only one specimen of P. trucha was found parasitized by a third-stage larva of this species.

  3. Variation of the ichthyofauna along the Goioerê River: an important tributary of the Piquiri-Paraná basin

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    Claudenice Dei Tos

    2014-03-01

    Full Text Available The construction of reservoirs is considered an important source of impacts on the fish fauna, severely altering the structure of the assemblage. This paper aimed to describe the structure of the fish assemblage of the Goioerê River, determining its longitudinal distribution and patterns of species dominance. The evaluation of its longitudinal variation in the diversity and abundance of the fish assemblage was conducted in July and October 2004 and January and May 2005. The collections were carried out near the headwaters (Gurucaia, middle stretch (Olaria, just above the falls (Paiquerê and downstream (Foz. Forty-four species were captured. The Gurucaia fish assemblages differed significantly from Olaria, Paiquerê and Foz. The Olaria assemblages differed significantly from the Foz. Gurucaia showed the lowest diversity and abundance of species. Astyanax aff paranae Eigenmann,1914 (78% of the total was found to be dominant at this site. Almost the same species richness was found at Olaria and Paiquerê, although Olaria had the greatest abundance of individuals. Astyanax aff paranae, Cyphocharax modestus (Fernández-Yépez, 1948 and Astyanax altiparanae Garutti & Britski, 2000 were the top three dominants and comprised over 71% of the total number of fish caught. At Paiquerê, Astyanax altiparanae, Hypostomus aff ancistroides (Ihering, 1911 and Loricariichthys platymetopon Isbrücker & Nijssen, 1979 composed 58% of the catches. Thirty-one species were recorded at Foz, which presented the greatest richness. The most abundant species were Apareiodon affinis (Steindachner, 1879, Galeocharax knerii (Steindachner, 1879 and A.altiparanae, which contributed to 50% of the total catches in this environment.These results record the fish biodiversity and how the community is longitudinally structured in the Goioerê River, and also demonstrate how this type of evaluation is important to understanding the fish community patterns and finding solutions to

  4. Habitat preferences of common native fishes in a tropical river in Southeastern Brazil

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    Marcus Rodrigues da Costa

    Full Text Available We determined in this study the habitat preferences of seven native fish species in a regulated river in Southeastern Brazil. We tested the hypothesis that fishes differ in habitat preference and that they use stretches of the river differing in hydraulic characteristics and substrate type. We surveyed fishes in four 1-km long river stretches encompassing different habitat traits, where we also measured water depth, velocity, and substrate type. We investigated preference patterns of four Siluriformes (Loricariichthys castaneus, Hoplosternum littorale, Pimelodus maculatus, and Trachelyopterus striatulus and three Characiformes (Astyanax aff. bimaculatus, Oligosarcus hepsetus, and Hoplias malabaricus, representing approximately 70% of the total number of fishes and 64% of the total biomass. We classified fishes into four habitat guilds: (1 a slow-flowing water guild that occupied mud-sand substrate, composed of two Siluriformes in either shallow ( 8 m, L. castaneus waters; (2 a run-dwelling guild that occurs in deep backwaters with clay-mud substrate, composed of the Characiformes A. aff. bimaculatus and O. hepsetus; (3 a run-dwelling guild that occurs in sandy and shallow substrate, composed of T. striatulus; and (4 a fast-flowing guild that occurs primarily along shorelines with shallow mud bottoms, composed of H. malabaricus and P. maculatus. Our hypothesis was confirmed, as different habitat preferences by fishes appear to occur in this regulated river.

  5. An integrative taxonomic study of Pavanelliella spp. (Monogenoidea, Dactylogyridae) with the description of a new species from the nasal cavities of an Amazon pimelodid catfish.

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    Aguiar, Julio C; Maia, Antônio A M; Silva, Marcia R M; Ceccarelli, Paulo S; Domingues, Marcus V; Adriano, Edson A

    2017-12-01

    The present study is an integrative taxonomic analysis of Pavanelliella spp. (Monogenoidea, Dactylogyridae), and describes a new species from the nasal cavities of the Amazonian pimelodid catfish Brachyplatystoma rousseauxii (Siluriformes Pimelodidae) from the Tapajós River (Amazon Basin, Pará state, Brazil). Pavanelliella jarii sp. n. is characterized by the presence of 3-4 rings in the male copulatory organ, the absence of rings around the vaginal atrium and by its sinuous vaginal canal, which sometimes forms 0.5-1 rings in the distal portion. The sequencing of the small subunit ribosomal DNA (ssrDNA) and internal transcribed spacer 1 (ITS-1) of three species of Pavanelliella, Vancleaveus cicinnus, and an undetermined dactylogyrid allowed the phylogenetic reconstruction of these dactylogyrids. The analysis indicated that P. jarii sp. n. is closely related to Pavanelliella takemotoi and Pavanelliella pavanellii, which formed a sister clade to ancylodiscoidines parasites of siluriform fish from the Oriental and Afrotropical regions. The analysis also corroborated the non-monophyly of Ancyrocephalinae, revealing that ancylodiscoidines arose between ancyrocephalines lineages, in a sister relationship to pseudodactylogyrines+marine ancyrocephalines+ancyrocephalines parasites of afrotropical perciforms+dactylogyrines. Cladistical analysis indicates that the haptoral anchor/bar complex has been lost several times in the evolutionary history of Dactylogyridae. The analysis also indicated that Dactylogyrus is polyphyletic, as Acolpenteron ureteroecetes and Dactylogyroides longicirrus arose between the three lineages formed by Dactylogyrus spp. Copyright © 2017 Elsevier B.V. All rights reserved.

  6. La contaminación por metales pesados en la Ciénaga Grande de Santa Marta, Caribe colombiano La contaminación por metales pesados en la Ciénaga Grande de Santa Marta, Caribe colombiano

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    Campos C. Néstor Hernando

    1990-09-01

    Full Text Available Se dan los resultados de los estudios sobre la contaminación por metales pesados en la Ciénaga Grande de Santa Marta. Las determinaciones se realizaron en el material en suspensión, en los bivalvos Crassostrea rhizophorae e Isognomon alatus y en los peces Gathorops spixii y Ariopsis bonillai. Los análisis de los metales Cd, Zn y Cu en el material en suspensión permitieron determinar que las mayores descargas de estos metales se suceden principalmente desde el Río Magdalena a través del Canal del Clarín y de los ríos que fluyen del piedemonte de la Sierra Nevada de Santa Marta. La comparación de los contenidos en bivalvas permiten determinar la importancia de estos organismos como bioindicadores. Los análisis en las dos especies de peces mostraron una diferenciación en la capacidad de acumulación entre una y otra.  Al comparar los contenidos de metales entre los diferentes tipos de muestras con los cambios en los contenidos en el material en suspensión y la salinidad, se observó que estos dos parámetros son principalmente los que controlan la biodisponibilidad de los metales y además afectan los procesos fisiológicos de los organismos, aumentando o disminuyendo la capacidad de bioacumulación. Results of the studies of heavy metals pollution in the Ciénaga Grande de Santa Marta are provided. The determinations have been done on the suspended matter, on the bivalves Crassostrea rhizophorae and Isognomon alatus, and in the fishes Gathorops spixii and Ariopsis bonillai. The analysis of Cd, Zn and Cu in the suspended matter led to determine that the discharges come principally from the Río Magdalena through the Canal del Clarín and the rivers coming from the Sierra Nevada de Santa Marta. Comparisons of the concentration in bivalves show the importance of this organisms as bioindicators. The analysis in both fish species show a difference in their capacity of accumulation. Comparison of the metals contents between different types

  7. Evidence of contamination by oil and oil products in the Santos-São Vicente estuary, São Paulo, Brazil

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    Juliana Souza Azevedo

    2012-06-01

    Full Text Available Different components of the mixed function oxidase (MFO system and the levels of fluorescent aromatic compounds in bile (FACs were measured in Cathorops spixii in order to assess the impact of polycyclic aromatic hydrocarbons (PAHs. Fish were sampled in an estuary (Santos/São Vicente with a history of contamination by PAHs, mainly due to the presence of the industrial complex of Cubatão city and of another of low anthropogenic influence (Cananéia on the Brazilian coast. FACs were higher in fish from the polluted site, and the PAH 5 and 6-ring metabolites were the most frequent - with 14% and 15%, respectively. Levels of the different components of the MFO system showed the same variation profile as the FACs for both estuaries. Therefore, the values found for somatic indexes and biomarkers with data of bile PAH metabolites indicate the presence of organic contaminants, especially in the area subject to the influence of the industrial complex on the Santos/São Vicente estuary.Diferentes componentes do sistema oxidase de função mista (MFO e os níveis de compostos aromáticos fluorescentes em bile (FACS foram determinados em Cathorops spixii a fim de avaliar o impacto de hidrocarbonetos policíclicos aromáticos (PAHs. Os peixes foram coletados em um estuário com histórico de contaminação por PAHs (Santos/São Vicente, devido principalmente a presença do complexo industrial na cidade de Cubatão e em outro com baixa influência antropogênica (Cananéia na costa brasileira. FACs foram maiores nos peixes oriundos da área contaminada, sendo os metabolitos de HPAs com 5 e 6 anéis, os mais representativos com 14% e 15%, respectivamente. Os níveis dos diferentes componentes do sistema MFO mostraram o mesmo perfil de variação que os FACs em ambos os estuários. Portanto, os valores encontrados para os índices somáticos e os biomarcadores considerados, em associação com os dados de metabólitos biliares de PAHs, indicam a presença de

  8. Las infracomunidades de parásitos de dos especies de Scartichthys (Pisces: Blenniidae en localidades cercanas del norte de Chile Parasite infracommunities of two blennid species, Scartichthys (Pisces: Blenniidae, at nearby localities off northern Chile

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    KAREN FLORES

    2009-03-01

    Full Text Available Se comparan las infracomunidades de parásitos de dos especies congenéricas y simpátridas de peces marinos: Scartichthys viridis (Valenciennes 1836 y Scartichthys gigas (Steindachner 1876 (Pisces: Blenniidae, en tres localidades del intermareal rocoso de Iquique (20°32' S, 70°11' O, norte de Chile, separadas por no más de 6 km, con muestras recolectadas entre agosto y septiembre de 2005. El objetivo fue evaluar la variabilidad de la riqueza, abundancia, diversidad, dominancia y composición en una escala espacial y temporal reducida. En total, se recolectaron 2.110 individuos parásitos en los 134 hospedadores examinados, los que pertenecían a 14 taxa. Se encontró una gran similitud en la composición y en las propiedades agregadas de las infracomunidades, tanto entre especies de hospedadores como entre sitios de estudio. Se interpreta que las condiciones ambientales, los factores ecológicos como el uso del habitat y de los recursos alimentarios, y los factores evolutivos como el alto grado de parentesco de estas especies de Scartichthys, son las principales influencias en la alta similitud parasitaria encontrada.The infracommunities of metazoan parasites in two congeneric and sympatric marine fish species, Scartichthys viridis (Valenciennes 1836 and Scartichthys gigas (Steindachner 1876, were studied and compared between three localities of the intertidal rocky shore off the coast of northern Chile, near Iquique (20°32' S, 70°11' W, which were separated by no more than 6 km. Samples were collected between August and September 2005. The goal of this study was to assess the variability in richness, abundance, diversity, dominance and parasite composition between close localities sampled within a short period. In all, 2,110 parasite individuals were collected from the 134 hosts examined, and 14 parasite taxa were identified. There was great similarity in the aggregated and compositional properties of the infracommunities, both between

  9. Uso do alimento por duas espécies simpátricas de Moenkhausia (Characiformes, Characidae em um riacho da Região Centro-Oeste do Brasil Food used by two sympatric species of Moenkhausia (Characiformes, Characidae, in a stream of center-western Brazil

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    Raffael M Tófoli

    2010-09-01

    Full Text Available Esse estudo avaliou sazonalmente a dieta de Moenkhausia dichroura (Kner, 1858 e M. sanctaefilomenae (Steindachner, 1907, coletadas em simpatria no riacho Cancela, Mato Grosso, Brasil. Independente do período hidrológico, alimentos de origem alóctone predominaram na dieta de ambas as espécies (>50% do total de itens consumidos, sendo insetos terrestres o recurso principal, embora, para M. dichroura insetos aquáticos tenham contribuído na dieta também. Hymenoptera (Formicidae foi o alimento mais consumido, sendo ambas as espécies caracterizadas como insetívoras terrestres. A dieta restrita dessas espécies é confirmada pelos baixos valores de amplitude de nicho trófico: Ba=0,26 para M. dichroura em ambos os períodos e Ba=0,41 no período de seca e 0,38 no período de chuva, para M. sanctaefilomenae. A sobreposição alimentar foi elevada no período de chuva (Ojk=0,75 e apresentou valor intermediário no período de seca (Ojk=0,41, evidenciando maior partilha do alimento entre as espécies neste período.This study evaluated the seasonality in the diet of Moenkhausia dichroura (Kner, 1858 and M. sanctaefilomenae (Steindachner, 1907, sympatric species of the Cancela stream, state of Mato Grosso, Brazil. Regardless of the seasonal period, allochthonous food source predominated in the diet of both species (>50% of all items consumed and among these terrestrial insects were the dominant resource. However, aquatic insects were important in the diet of M. dichroura as well. Hymenoptera (Formicidae was the dominant item to both species, thus they were characterized as terrestrial insectivorous. The restricted diet of these species is confirmed by the trophic niche breadth, whose values were in general low: Ba=0.26 to M. dichroura in both periods and Ba=0.41 and 0.38 in the dry and rainy period, respectively, to M. sanctaefilomenae. The feeding overlap was high in the rainy period (Ojk=0.75 and intermediate in the dry period (Ojk=0.41, showing

  10. Diversidad y variación estacional de peces en la cuenca baja del río Nanay, Perú

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    Ericka Correa

    2011-05-01

    Full Text Available El presente trabajo informa sobre la diversidad de peces en la cuenca baja del rio Nanay, tributario del río Amazonas. Esta zona está sometida a la extracción indiscriminada de peces con usos ornamentales y de consumo directo. Utilizando redes de arrastre (10 x 2,5 m, 5 mm de luz de malla, se realizaron capturas en época de vaciante (agosto y setiembre de 2007 y creciente (febrero de 2008, en tres lugares del rio Nanay. Se colectaron 1626 individuos, correspondientes a 86 especies, de 23 familias y cinco órdenes. El número de especies vario entre 13 y 21 en época de vaciante y entre 18 y 26 especies en época de creciente. Predominaron los Characiformes, Siluriformes y Perciformes. El 76% de los individuos con tamaños menores de 10 cm. El 65% de las especies registradas tienen uso ornamental.

  11. The complete mitochondrial genome of the threatened Neotropical catfish Lophiosilurus alexandri (Silurifomes: Pseudopimelodidae and phylogenomic analysis indicate monophyly of Pimelodoidea

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    Daniel Cardoso Carvalho

    Full Text Available Abstract Lophiosilurus alexandri is an endemic catfish from the São Francisco River Basin (Brazil popularly known as pacamã, which has economic potential for aquaculture farming. The mitochondrial genome was sequenced for the threatened Neotropical catfish L. alexandri. Assembly into scaffolds using MIRA and MITObim software produced the whole, circularized mitochondrial genome, which comprises 16,445 bp and presents the typical gene arrangement of Teleostei mitochondria. A phylogenomic analysis was performed after the concatenation of all proteins obtained from whole mitogenomes of 20 Siluriformes and two outgroups. The results confirmed the monophyly of nine families of catfishes and also clustered L. alexandri as a sister group to the family Pimelodidae, thus confirming the monophyly of the superfamily Pimelodoidea. This is the first mitochondrial phylogenomics study for Pimelodoidea and the first mitogenome described for the Pseudopimelodidae family, representing an important resource for phylogeography, evolutionary biology, and conservation genetics studies in Neotropical fishes.

  12. TOXICOPATHOLOGICAL IMPACT OF CADMIUM CHLORIDE ON THE ACCESSORY RESPIRATORY ORGAN OF THE AIR-BREATHING CATFISH HETEROPNEUSTES FOSSILIS

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    N. Susithra, N. Jothivel, P. Jayakumar, V. I. Paul

    2007-01-01

    Full Text Available Sublethal cadmium chloride (0.3 ppm toxicity induced stress related morphopathological alterations in the accessory respiratory organ of the air-breathing catfish Heteropneustes fossilis (Siluriformes; Heteropneustidae have been investigated at various intervals of exposure. The histopathological manifestation of the cadmium toxicity includes bulging of the hyperemic secondary lamellae into the lumen of the accessory respiratory organ, necrosis and sloughing of the respiratory epithelium leading to haemorrhage and fusion of SL at various stages of the exposure. Periodic alterations in the densities of epithelial cells and mucous cells along with the development of non-tissue spaces have also been noticed at different exposure periods leading to alterations in the thickness of the respiratory epithelia. The heavy metal salt exposure has affected the mucogenic activity of the respiratory epithelium not only quantitatively but qualitatively also, indicating the probable ameliorative role fish mucus in cadmium toxicity.

  13. A massive invasion of fish species after eliminating a natural barrier in the upper rio Paraná basin

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    Horácio Ferreira Júlio Júnior

    Full Text Available Based on long-term studies in the upper rio Paraná basin, in addition to a broad review of literature and other information, we were able to identify 33 species of native fishes in the lower rio Paraná basin that successfully colonized the upper rio Paraná after Itaipu impoundment, that flooded the natural geographic barrier constituted by the Sete Quedas Falls. These species belong to six Orders, encompassing two of Myliobatiformes, six of Characiformes, 17 of Siluriformes, six of Gymnotiformes, one of Perciformes, and one of Pleuronectiformes. Extensive remarks regarding each species, including their influence upon the native assemblage, in addition to comments on other non-indigenous species, are also provided. We conclude that, in spite of its widespread neglected by environmental impact studies, massive invasion of species is a real possibility when natural barriers are suppressed by reservoirs.

  14. Electric Organ Discharges of Mormyrid Fish as a Possible Cue for Predatory Catfish

    Science.gov (United States)

    Hanika, S.; Kramer, B.

    During reproductive migration the electroreceptive African sharptooth catfish, Clarias gariepinus (Siluriformes), preys mainly on a weakly electric fish, the bulldog Marcusenius macrolepidotus (Mormyridae; Merron 1993). This is puzzling because the electric organ discharges of known Marcusenius species are pulses of a duration (system (optimum sensitivity, 10-30Hz Peters and Bretschneider 1981). On the recent discovery that M. macrolepidotus males emit discharges lasting approximately ten times longer than those of females (Kramer 1997a) we determined behavioral thresholds for discharges of both sexes, using synthetic playbacks of field-recorded discharges. C. gariepinus detected M. macrolepidotus male discharges down to a field gradient of 103μVpeak-peak/cm and up to a distance of 1.5m at natural field conditions. In contrast, thresholds for female discharges were not reached with our setup, and we presume the bulldogs eaten by catfish are predominantly male.

  15. Fallen leaves on the water-bed: diurnal camouflage of three night active fish species in an Amazonian streamlet

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    Ivan Sazima

    Full Text Available Resemblance to dead leaves is a well known type of camouflage recorded for several small vertebrates that dwell in the leaf and root litter on the ground. We present here instances of such resemblance in three species of nocturnal fishes (Siluriformes and Gymnotiformes that spend the daytime among submersed root-tangle with leaf litter in Amazonian streams. All three species are very difficult to spot visually, due both to their shape and colors which blend with the substrate, as well as to the heterogeneous nature of their cover. Two species were recorded to lie on their sides, which adds to their resemblance to dead leaves. When disturbed, one species may drift like a waterlogged leaf, whereas another moves upwards the root-tangle, exposing its fore body above the water surface. We regard their leaf-like shapes, cryptic colors, and escape movements as a convergence in defensive responses to visually hunting aquatic vertebrates, most likely diurnal predaceous fishes.

  16. Descarte de peixes na pesca comercial em Tefé, médio Solimões, Amazônia Central - DOI: 10.4025/actascibiolsci.v30i1.1471 Discarded catches from commercial fisheries in the middle Solimões river, Central Amazon region - DOI: 10.4025/actascibiolsci.v30i1.1471

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    Wuerles Bessa Barbosa

    2008-03-01

    Full Text Available Descartes são comuns na pesca comercial, sendo avaliados para apoiar o manejo da pesca na região. Por meio de acompanhamentos diários das pescarias da frota comercial de Tefé, foi descrito o descarte de pescado no médio Solimões. Utilizando análises de correlação e covariância, foram avaliados fatores que determinam o descarte com três modalidades distintas de pesca. Os pescadores selecionaram o pescado no momento da captura por espécie e tamanho. As espécies de pescados mais descartados foram jaraquis, tucunarés e branquinhas, porém os mais freqüentes, no descarte, foram espécies dos Siluriformes. Os apetrechos de pesca analisados apresentaram diferenças nas características de seu descarte. O descarte foi menor na enchente-cheia (5-17% da captura, conforme apetrecho que durante a vazante-seca (20-62%, conforme apetrechoDiscards are common in commercial fishery, and are evaluated in order to support fisheries management in the region. Fish discards in the middle Solimões River were described through daily monitoring of fishing activities by the commercial fleet of the town of Tefé. By making use of analyses of correlation and covariance, determinant factors for discards in three different types of fisheries were evaluated. The crew selected the fish at the moment of capture, by species and size. Among the most discarded fish species were silver prochilodus, peacock bass, and curimata inormata; however, the most frequently discarded were Siluriform species. The fishing gear analyzed featured differences in their discarding characteristics. Discard was lower during the flood period (5-17% of catches, depending on gear than during the dry season (20-62% of catches, depending on gear

  17. Longitudinal habitat disruption in Neotropical streams: fish assemblages under the influence of culverts

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    José Roberto Mariano

    Full Text Available This study assessed differences in fish assemblages existing upstream and downstream two types of culverts, one on each of two different Neotropical streams. We analyzed the composition and structure of the ichthyofauna and tested for spatial patterns. Fish sampling was carried out monthly between November 2009 and October 2010 using different fishing gears. We collected 2,220 fish of 33 species; 901 in stretches of the Lopeí stream - circular culvert and 1,310 in stretches of the Pindorama stream - box culvert. Fish abundance was similar in upstream and downstream stretches of the circular culvert, whereas it was slightly higher in the upstream than downstream stretch for the box culvert. Characiformes predominated in the upstream stretch of both culverts. On the other hand, Siluriformes was abundant in the downstream stretch of the circular culvert, with similar abundance in the stretches of the box culvert. Species richness and diversity (Shannon-Weiner Index were higher in the downstream stretch of the circular culvert, but they were similar in both stretches of the box culvert. The most abundant species were Astyanax altiparanae, A. paranae, A. fasciatus, Ancistrus sp., and Hypostomus sp. The last two species were more abundant in the downstream stretch of the circular culvert, and similar in stretches of the box culvert. Our study indicated variations in the species abundance, richness, and diversity between upstream and downstream stretches in particular of the circular culvert in the Lopeí stream, suggesting that fish movements are restrained more intensively in this culvert, especially for Siluriformes. The drop in the circular culvert outlet probably created passage barriers especially for those fish that has no ability to jump, where downstream erosion could lead to culvert perching. Studies on appropriate road crossing design or installation are fundamental whereas improvements in these structures can restore the connectivity of

  18. Descarte de peixes na pesca comercial em Tefé, médio Solimões, Amazônia Central = Discarded catches from commercial fisheries in the middle Solimões river, Central Amazon region

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    Vandick da Silva Batista

    2008-01-01

    Full Text Available Descartes são comuns na pesca comercial, sendo avaliados para apoiar o manejo da pesca na região. Por meio de acompanhamentos diários das pescarias da frota comercial de Tefé, foi descrito o descarte de pescado no médio Solimões. Utilizando análises de correlação e covariância, foram avaliados fatores que determinam o descarte com três modalidades distintas de pesca. Os pescadores selecionaram o pescado no momento da captura por espécie e tamanho. As espécies de pescados mais descartados foram jaraquis, tucunarés e branquinhas, porém os mais freqüentes, no descarte, foram espécies dos Siluriformes. Os apetrechos de pesca analisados apresentaram diferenças nas características de seu descarte. O descarte foi menor na enchente-cheia (5-17% da captura, conforme apetrecho que durante a vazante-seca (20-62%, conforme apetrecho. Discards are common in commercial fishery, and are evaluated in order to support fisheries management in the region. Fish discards in themiddle Solimões River were described through daily monitoring of fishing activities by the commercial fleet of the town of Tefé. By making use of analyses of correlation and covariance, determinant factors for discards in three different types of fisheries wereevaluated. The crew selected the fish at the moment of capture, by species and size. Among the most discarded fish species were jaraquis Semaprochilodus spp., tucunarés Cichla spp. and branquinhas Curimatidae; however, the most frequently discarded were Siluriform species. The fishing gear analyzed featured differences in their discarding characteristics. Discard was lower during the flood period (5-17% of catches, depending on gear than during the dry season (20-62% of catches, depending on gear.

  19. Variações temporais na passagem de peixes pelo elevador da Usina Hidrelétrica de Santa Clara, rio Mucuri, leste brasileiro Temporal patterns of fish passage in Santa Clara Power Plant's fish lift, Mucuri River, east Brazil

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    Paulo dos S. Pompeu

    2006-06-01

    Full Text Available O presente estudo teve como objetivo determinar padrões temporais na passagem de peixes pelo elevador da Usina Hidrelétrica de Santa, localizado no rio Mucuri. Durante quatro meses, de novembro de 2003 a março de 2004, foram realizados ciclos de transposição a cada duas horas, quando todos os indivíduos foram contados e identificados. Durante este período foram transpostos 67.838 indivíduos de 31 espécies. A abundância de Characiformes migradores no elevador foi maior no período diurno, enquanto Siluriformes foram observados em maior quantidade à noite. A abundância de peixes no elevador foi relacionada significativamente com as vazões no rio Mucuri. O padrão encontrado torna possível a melhor utilização do elevador, priorizando sua operação durante o dia e em períodos de maior vazão.The current study had the objective of determining temporal patterns of fish passage in Santa Clara Power Plant's fish lift, Mucuri River. During four months, from November 2003 to March 2004, transposition cycles were performed each two hours, when the specimens were counted and identified. During this migration period 67,838 individuals of 31 species passed through the lift. Migratory Characiformes abundance was larger during the day, whereas the Siluriformes were registered mainly at night. Fish abundance in the lift was significantly related to the Mucuri river flow. The temporal pattern found makes possible a better utilization of the lift, focusing cycles during the day and high flows periods.

  20. Assessing genotoxic effects in fish from a marine protected area influenced by former mining activities and other stressors

    International Nuclear Information System (INIS)

    Gusso-Choueri, Paloma Kachel; Choueri, Rodrigo Brasil; Santos, Gustavo Souza; Seraphim de Araújo, Giuliana; Feitosa Cruz, Ana Carolina

    2016-01-01

    The goal of the current study was to evaluate different genotoxicity tools in order to assess a marine protected area (MPA) affected by former mining activities and urban settlements. A catfish (Cathorops spixii) was analyzed for genotoxic effects at the (i) molecular and at the (ii) chromosomal levels. Through factor analysis, genotoxicity was found to be linked to levels of metals bioaccumulated and PAH metabolites in the bile. Micronucleus and nuclear alteration were less vulnerable to the effects of confounding factors in mildly contaminated areas since they were more frequently associated with bioaccumulated metals than the DNA analysis. The different genotoxicity responses allowed for the identification of sources of pollution in the MPA. This approach was important for detecting environmental risks related to genotoxic contaminants in a mildly contaminated MPA. -- Highlights: •We assessed genotoxicity and bioaccumulation in catfish from a marine protected area. •The area is under the influence of past mining activities and urban settlements. •Cellular level responses were highly associated with body burdens of metals and As. •Responses at the molecular level were less associated with body burdens. •Genotoxicity in different organs helped identify pollution sources in MPA.

  1. Population structure of fish fauna in the estuarine area of Caeté River, Bragança, Pará, Brazil - DOI: 10.4025/actascibiolsci.v20i0.4469 Estrutura populacional de peixes no estuário do rio Caeté, Bragança, Pará, Brasil - DOI: 10.4025/actascibiolsci.v20i0.4469

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    Victoria J. Isaac

    1998-07-01

    Full Text Available Este estudo descreve o tamanho relativo e a estrutura etária dos peixes cienídeos Macrodon ancylodon, Stellifer rastrifer e Stellifer naso, o ariídeo Cathorops spixii e o aspredinídeo Aspredo aspredo para o estuário do rio Caeté. Quatro amostragens bimensais foram feitas com malhadeira e rede de arrasto de fundo, durante os meses de agosto, outubro e dezembro de 1996, e fevereiro de 1997, em três áreas diferentes: (A canal principal do rio, (B baía, e (C área costeira. O comprimento total e o peso de 16.298 exemplares dessas espécies foram avaliados. Distribuições de freqüência mensais foram plotados. As coortes foram identificadas ao dividir as distribuições de freqüência em distribuições normais isoladas. O comprimento assintótico (L∞ e K foi estimado para esses estoques, com o uso do programa FISAT. A biomassa média (g/m2 por espécie foi estimada utilizando-se o método de área varrida. A biomassa média de Macrodon ancylodon foi 0,29g/m2; seu comprimento total variou de 3-41cm; as distribuições de freqüência permitiram identificar cinco coortes; L∞ = 45,50cm e K = 0,491 ano-1. Stellifer rastrifer apresentou uma biomassa média de 0,31g/m2 e seus comprimentos totais variaram de 1-17cm, L∞ = 22,5cm e K = 0,31 ano-1. Stellifer naso teve biomassa média de 0,03g/m2, L∞ = 26,3cm e K = 0,321 ano-1; seu comprimento total variou de 2 a 25cm. Cathorops spixii apresentou biomassa média 0,55g/m2, estimativas de L∞ = 33,3cm e K = 0,36 ano-1; sua densidade foi a mais alta dentro dos habitats do rio. Aspredo aspredo apresentou biomassa de 0,06g/m,2 maior abundância dentro do rio; comprimento total de 2 a 36cm; L∞ = 42,5cm e K = 0,35ano-1. Ainda que cada uma dessas espécies apresenta diferentes estratégias biológicas quanto à distribuição espacial e à abundância relativa, verificou-se que todas utilizam os habitats estuarinos como áreas de criadouro, nas primeiras fases de seu ciclo de vida.This study

  2. Assessing pollution in marine protected areas: the role of a multi-biomarker and multi-organ approach.

    Science.gov (United States)

    Gusso-Choueri, Paloma Kachel; Choueri, Rodrigo Brasil; de Araújo, Giuliana Seraphim; Cruz, Ana Carolina Feitosa; Stremel, Tatiana; Campos, Sandro; Abessa, Denis Moledo de Sousa; Ribeiro, Ciro Alberto Oliveira

    2015-11-01

    Marine protected areas (MPAs) are vulnerable to many pressures, including pollution. However, environmental quality monitoring in these areas traditionally relies on only water chemistry and microbiological parameters. The goal of the current study was to investigate the role of a set of biomarkers in different target organs (liver, kidney, and gills) of fish in order to assess the environmental quality of an MPA (MTs, GPx, GST, GSH, DNA damage, LPO, AChE, and condition index). Chemical analyses were also performed on liver and muscle tissues to evaluate metal body burdens, and PAHs were identified in bile. A demersal fish (Cathorops spixii) that is widely consumed by the local population was used as bioindicator species, and the results were integrated using multivariate analysis. The use of the biomarker approach allowed for the identification of both seasonal and spatial variations in pollution sources around the Environmental Protected Area of Cananéia-Iguape-Peruíbe (APA-CIP). Higher metal body burdens associated with biological responses were found in the sites under the influence of urban areas during the dry season, and they were found in the sites under the influence of the Ribeira de Iguape River (RIR) during the rainy season. The liver was found to be more responsive in terms of its antioxidant responses, whereas gills were found to be more responsive to biomarkers of effect. These results show that this set of biomarker analyses in different organs of fish is a useful tool for assessing chemical pollution in an MPA.

  3. Evaluación comparativa de dos métodos para determinar la actividad de fosfolipasa A en venenos de serpientes

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    Fanny Lazo

    2014-06-01

    Full Text Available Se ha evaluado la actividad de fosfolipasa A en seis venenos de serpientes comparando las ventajas de un método espectrofotométrico, previamente adaptado a nuestras condiciones de laboratorio, frente al método macroscópico de retardo en la coagulación de una emulsión lipoproteica. En ambos casos, la actividad de fosfolipasa A estuvo presente en los venenos de Micrurus spixii, Crotalus durissus, Bothrops brazili, Lachesis muta y Bothrops atrox y la actividad decreció en orden. En cambio, la actividad de la enzima en el veneno de Micrurus surinamensis sólo fue detectada por el método espectrofotométrico. Así mismo, los resultados basados en la cantidad de veneno utilizado para medir la actividad, mostraron una mayor sensibilidad con el método espectrofotométrico en comparación con el método macroscópico ya que se requirieron cantidades menores en el orden de 2 a 10 veces.

  4. Registros notáveis de répteis de áreas abertas naturais do planalto e litoral do Estado de Santa Catarina, sul do Brasil

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    Ivo Rohling Ghizoni-Junior

    2009-06-01

    Full Text Available http://dx.doi.org/10.5007/2175-7925.2009v22n3p129 A composição e a distribuição dos répteis em Santa Catarina são pouco conhecidas, particularmente em suas áreas abertas naturais do planalto (estepe ombrófila e do litoral (faixa litorânea de restingas com dunas. Visando contribuir com o conhecimento dos répteis nestas áreas, são apresentados registros de dezesseis espécies anteriormente desconhecidas ou com poucos registros para Santa Catarina: Acanthochelys spixii, Anops kingii, Cnemidophorus lacertoides, C. vacariensis, Leptotyphlops munoai, Mastigodryas b. bifossatus, Tantilla aff. melanocephala, Atractus reticulatus, Gomesophis brasiliensis, Lygophis flavifrenatus, Oxyrhopus r. rhombifer, Phalotris reticulatus, Philodryas agassizii, Xenodon dorbignyi, Micrurus altirostris e Bothrops pubescens. São discutidos brevemente aspectos sobre a distribuição e a conservação destas espécies.

  5. cultivo

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    M. García-Ulloa

    2004-01-01

    Full Text Available Se evaluó el crecimiento de juveniles (2.77 g de peso promedio de la tilapia Oreochromis aureus (Steindachner, cultivados con diferentes raciones alimenticias bajo condiciones experimentales de laboratorio. Los tratamientos consistieron en el suplemento alimenticio de 6, 8 y 10% del peso de la biomasa total, los cuales fueron estudiados por triplicado en peceras de vidrio de 113 L de capacidad, ajustando una densidad inicial de 25 peces por acuario. El ensayo tuvo una duración de 35 días, y se realizaron biometrías (peso húmedo cada 7 días. El crecimiento específico no mostró diferencias significativas (P > 0.05 entre los tratamientos, registrando un promedio de 5.45%/d. Sin embargo, la conversión alimenticia y utilización del alimento obtenida para el grupo del 6% sugieren una mejor eficiencia en el aprovechamiento del alimento

  6. Sex-specific differences in the synaptonemal complex in the genus Oreochromis (Cichlidae).

    Science.gov (United States)

    Campos-Ramos, Rafael; Harvey, Simon C; Penman, David J

    2009-04-01

    Total synaptonemal complex (SC) lengths were estimated from Oreochromis aureus Steindachner (which has a WZ/ZZ sex determination system), O. mossambicus Peters and O. niloticus L. (both of which have XX/XY sex determination systems). The total SC length in oocytes was greater than that in spermatocytes in all three species (194 +/- 30 microm and 134 +/- 13 microm, 187 +/- 22 microm and 127 +/- 17 microm, 193 +/- 37 microm and 144 +/- 19 microm, respectively). These sex-specific differences did not appear to be influenced by the type of sex determination system (the female/male total SC length ratio was 1.45 in O. aureus, 1.47 in O. mossambicus and 1.34 in O. niloticus) and do not correlate with the lack of any overall sex-specific length differences in the current Oreochromis linkage map. Although based on data from relatively few species, there appears to be no consistent relationship between sex-specific SC lengths and linkage map lengths in fish. Neomale (hormonally masculinized genetic female) O. aureus and O. mossambicus had total SC lengths of 138 +/- 13 microm and 146 +/- 13 microm respectively, more similar to normal males than to normal females. These findings agree with data from other vertebrate species that suggest that phenotypic sex, rather than genotype, determines traits such as total SC length, chiasmata position and recombination pattern, at least for the autosomes.

  7. Anuran community composition along two large rivers in a tropical disturbed landscape

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    Mauricio Almeida-Gomes

    2015-02-01

    Full Text Available In this study we evaluated how anuran species were distributed in riparian habitats along two large rivers. Sampling was carried out between January and March 2012 in the municipality of Cachoeiras de Macacu, state of Rio de Janeiro. We delimited 20 plots along each river, ten in portions inside the forest of the Reserva Ecológica de Guapiaçu (REGUA, and with comparatively greater amount of forest cover, and ten outside REGUA, with comparatively lesser forest cover surrounding the rivers. We recorded 70 individuals from 14 frog species in the Manoel Alexandre River and 63 individuals from 15 frog species in the Guapiaçu River. The most abundant species in both rivers was Cycloramphus brasiliensis (Steindachner, 1864, and it was more abundant in sections with greater amount of forest cover. This information, coupled with the occurrence of species that are more adapted to open and more disturbed habitats in river sections that harbor lesser riparian vegetation, help to explain differences in amphibian species composition between river sections with greater and lesser forest cover. The results of our study highlight the importance of preserving riparian vegetation associated with rivers in the Atlantic Forest for the conservation of amphibians.

  8. Molecular survey and microscopic examination of Hepatozoon Miller, 1908 (Apicomplexa: Adeleorina) in lacertid lizards from the western Mediterranean.

    Science.gov (United States)

    Maia, João P M C; Perera, Ana; Harris, D James

    2012-12-01

    The genus Hepatozoon Miller, 1908 (Apicomplexa: Adeleorina) is composed of intracellular haemogregarine parasites that are widely distributed among all tetrapod groups. The present study combines microscopic and molecular data on haemogregarine parasites from lizards in the western Mediterranean. We screened tissue samples and examined blood smears for the presence of species of Hepatozoon from four lizards, namely Algyroides marchi Valverde, endemic to Southeast Spain, Podarcis bocagei Seoane from Spain and Portugal, P hispanica Steindachner from Spain, and P lilfordi Günther from Cabrera, Balearic Islands (Spain). Our results show that prevalence and intensity of Hepatozoon parasites vary between and within lizard species from different regions. Algyroides marchi and P bocagei from Spain had the lowest values, whereas P hispanica had the highest. Phylogeny based on 18S rRNA gene sequences indicates that most of the new Hepatozoon sequences are part of a clade exclusive from North African and Iberian lizards, except for a single P bocagei isolate that is found related to another clade including isolates from other reptile host species and rodents. Interestingly, isolates from Algyroides form a distinct monophyletic subgroup, which could be a signal of strict host-specificity within this host genus.

  9. Contributions to the herpetofauna of the Albertine Rift: Two new species of chameleon (Sauria: Chamaeleonidae) from an isolated montane forest, south eastern Democratic Republic of Congo.

    Science.gov (United States)

    Tilbury, Colin R; Tolley, Krystal A

    2015-01-13

    Two new species of chameleons from the genera Rhampholeon and Kinyongia are described from an isolated montane forest remnant situated toward the southern end of the Albertine Rift bordering Lake Tanganyika. The closest known localities of species from these genera are 200km and 400km to the north respectively, separated by large intervening tracts of lowland savannah and Brachystegia (Miombo) woodland - habitats not normally inhabited by species of these genera. Rhampholeon hattinghi sp. nov. and Kinyongia mulyai sp. nov. bear superficial resemblances to previously described species (Rh. boulengeri Steindachner and K. adolfifriderici  (Sternfeld)). Rhampholeon hattinghi sp. nov. has a relatively smooth supra-orbital ridge, deep axillary but absent inguinal mite pockets, prominent white spots on the base of the tail and a uniquely derived hemipenal morphology with billowing parasulcal evaginations. Like K. adolfifriderici, Kinyongia mulyai sp. nov. is devoid of a rostral appendage but differs in having a longer and narrower head, a higher upper labial scale count and by the absence of a dorsal crest in the male. To place these new chameleons within the context of their respective genera, Bayesian and maximum likelihood phylogenetic analyses were carried out utilising two mitochondrial (ND2 and 16S) and one nuclear marker (RAG1).  Both chameleons were found to have morphological features that distinguish them from other congeners. Based on phylogenetic analysis they are clearly separate evolutionary lineages and are described as new species. 

  10. Environmental parameters affecting the structure of leaf-litter frog (Amphibia: Anura communities in tropical forests: a case study from an Atlantic Rainforest area in southeastern Brazil

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    Carla C. Siqueira

    2014-04-01

    Full Text Available Despite a recent increase of information on leaf litter frog communities from Atlantic rainforests, few studies have analyzed the relationship between environmental parameters and community structure of these animals. We analyzed the effects of some environmental factors on a leaf litter frog community at an Atlantic Rainforest area in southeastern Brazil. Data collection lasted ten consecutive days in January 2010, at elevations ranging between 300 and 520 m above sea level. We established 50 quadrats of 5 x 5 m on the forest floor, totaling 1,250 m² of sampled area, and recorded the mean leaf-litter depth and the number of trees within the plot, as well as altitude. We found 307 individuals belonging to ten frog species within the plots. The overall density of leaf-litter frogs estimated from the plots was 24.6 ind/100m², with Euparkerella brasiliensis (Parker, 1926, Ischnocnema guentheri (Steindachner, 1864, Ischnocnema parva (Girard, 1853 and Haddadus binotatus (Spix, 1824 presenting the highest estimated densities. Among the environmental variables analyzed, only altitude influenced the parameters of anuran community. Our results indicate that the study area has a very high density of forest floor leaf litter frogs at altitudes of 300-500 m. Future estimates of litter frog density might benefit from taking the local altitudinal variation into consideration. Neglecting such variation might result in underestimated/overestimated values if they are extrapolated to the whole area.

  11. The snake assemblage (Squamata: Serpentes of a Cerrado-Caatinga transition area in Castelo do Piauí, state of Piauí, Brazil

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    Francílio da Silva Rodrigues

    2011-08-01

    Full Text Available This study records and analyzes the diversity and structure of a snake assemblage in a transition area between Cerrado and Caatinga, in the municipality of Castelo do Piauí, state of Piauí, comparing the distribution and similarity of the species composition with other open localities already studied in Brazil. We used three complementary sampling methods: time constrained search (TCS, pitfall traps with drift fences (PFT, and incidental encounters (IE. During the TCS and PFT, 912 hours/observer and 6,468 days/trap were used, respectively. We estimated 23 species of snakes for the locality, although only 19 species were recorded. Philodryas nattereri Steindachner, 1870 (n = 10, Liophis poecilogyrus (Schlegel, 1837 (n = 9, Liophis viridis Günther, 1862 (n = 8 and Thamnodynastes sp. (n = 8 were the most abundant species. Terrestrial, cryptozoic, and diurnal snakes predominated in the assemblage (Boidae = 2 species, Dipsadidae = 12, Colubridae = 2, Elapidae = 1, Viperidae = 2. The results indicate that the fauna of the locality is similar with that of other open formations, especially the Caatinga, corroborating previous floristic studies. Comparisons between snake assemblages analyzed by different authors suggest structural differences between the assemblages of the Cerrado and the Caatinga, contradicting the hypothesis of mixed composition of fauna in these biomes.

  12. El cultivo de tilapias: una amenaza a las especies ícticas nativas en Nicaragua.

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    McCrary, J.K.

    2001-08-01

    Full Text Available El cultivo de tilapia del nilo (oreochromis niloticus, linnoeus previamente alimentados con hormonas para producir machos, en la laguna de Apoyo en Nicaragua ha permitido la introducción a la laguna de individuos, incluyendo hembras fecundas. Discutimos las consecuencias de esta introducción, en términos de amenazas de extinción de especies endémicas nativas a través de destrucción de hábitat, competencia por sitios de cortejo y alimentación, proliferación de parásitos en poblaciones de fauna nativa, y la depredación de alevines nativos. Mientras que una liberación anterior de una especie similar (O. aureus Steindachner en la laguna de Apoyo, en 1983, tuvo poco impacto observado, este segundo incidente, aquí documentado, ha resultado en dramáticos impactos negativos en la laguna, amenazando especies endémicas locales y creando posiblemente riesgos en la salud humana. Abogamos por la remoción total de tilapias de ecosistemas naturales como el de Apoyo, y advertimos sobre el peligro de las introducciones de especies no nativas en ecosistemas naturales, aun donde introducciones previas han sucedido.

  13. Prevalence and intensity of pentastomid infection in two species of snakes from northeastern Brazil

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    WO Almeida

    Full Text Available This study aimed to evaluate the infection rates of snakes by pentastomids in the semi-arid region of Brazil. Fifteen snakes (four Micrurus ibiboboca (Merrem, 1820 and eleven Philodryas nattereri Steindachner, 1870 were collected between January and April of 2005, in the municipality of Crato (07° 14' S and 39° 24' W, State of Ceará, Brazil. Laboratorial analysis of the respiratory tracts of the sampled snakes indicated differences in host infection rates: four individuals of P. nattereri (36.4% were infected by Cephalobaena tetrapoda Heymons, 1922 (mean infection intensity 1.5 ± 0.28, 1-2 and three specimens (27.3% by Raillietiella furcocerca (Diesing, 1863 (2.3 ± 1.32, 1-5. Only one individual of M. ibiboboca (25% was infected by a non-identified species of Raillietiella sp. These are the first data on pentastomid infection in snakes in Northeastern Brazil and both snake species comprise new host records for the pentastomids. The results also indicate that the generalist parasites C. tetrapoda and R. furcocerca share their definitive hosts.

  14. Non-seasonal reproduction in inseminating species of Mimagoniates (Characidae, Characiformes from southern Brazil

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    Vinicius Renner Lampert

    2018-03-01

    Full Text Available Abstract Some aspects of reproduction in two species of Mimagoniates, M. microlepis (Steindachner 1877 and M. rheocharis Menezes & Weitzman 1990 are herein described. Samples were taken monthly from January 1998 to February 1999 in two streams in the locality of Maquiné, Rio Grande do Sul, Brazil. Results from the analysis of hundreds of specimens of M. microlepis and M. rheocharis in two investigated sites indicated mature specimens and peaks of the gonadosomatic index (GSI along the year. There was a negative and significant correlation between M. microlepis male’s GSI and water temperature. Females of the latter species and both sexes of M. rheocharis, in turn, showed no correlation with any of the tested parameters (relative stomach weight, day length, rainfall. Absolute and relative fecundity are lower than in externally fertilized species of Characidae. Maximum oocyte length was 1.14 mm for M. microlepis and 1.02 mm for M. rheocharis and both species were characterized as total spawners based on the type of oocyte development estimated through oocyte size analysis. Features like non-seasonal reproductive period, low fecundity, and insemination may indicate adaptive advantages, which may enhance the chance of survival even with low energetic investment and improved fertilization.

  15. Ingestion and selection of suprabenthic crustaceans by small-sized fishes in a lower saltmarsh system

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    Yoko Wakabara

    1996-01-01

    Full Text Available This study was performed in the lower saltmarsh system of the Arrozal, in the Cananéia lagoon estuarine region (25º02'S - 47º56'W, Brazil. Suprabenthic fauna was surveyed Wlth a small sledge and fishes were captured with casting and set nets to analyse: crustacean fauna as food for local fish species; difference in the diet at different times of the year; if there is diet overlap between species and the feeding behaviour of the species analysed. The fauna of Arrozal is poor in species, dominated mainly by Metamysidopsis alongata atlantica, Acartia lilljeborgi, Atylus minikoi, decapod larvae, and reveals a strong seasonal variation. The fishes were ali camivorous with suprabenthic crustacean as their main food resource. Seasonal changes in food supply are also reflected in the diet. Of the 12 flSh species collected six were opportunistlc feeders whereas six others were selective feeders. Food overlap value of 0.08 for ali of the fish community indicates an almost completely distinct food niches. The increased overlapping of summer food between Cathorops spixii and species of Group 11 and between Oligoplites sp and species of Group I seems to have two different explanations: 1 the mmIDishing of food supply for species feeding on benthic originated suprabenthic crustaceans and 2 overabundance of planktonic forms of suprabenthos as well as a period of high feeding activity of fishes with such diet.O presente estudo foi realizado no infralitoral contíguo à marisma, na Ponta do Arrozal, região estuarina lagunar de Cananéia (25º02'S - 47º56'W, Brasil. A fauna suprabêntica foi amostrada com uma pequena draga e os peixes capturados com tarrafa e rede de espera, com a finalidade de analisar: a composição de espécies dos crustáceos suprabênticos como itens alimentares dos peixes; diferenças na dieta em diferentes época do ano; se ocorre sobreposição alimentar entre as espécies e o comportamento alimentar: das espécies de peixes

  16. Notes on the Bull shark Carcharhinus leucas in the lagoon region of Cananéia, Brazil

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    V Sadowsky

    1971-12-01

    Full Text Available Ninety one young specimens and 3 adult females of BulI shark ("cação cabeça chata" caught in the lagoon region of Cananéia were examined, their tooth formula being 27/25 and the number of pre-caudal vertebrae ranging from 109 to 115. The proportion between the 1st and 2nd dorsal fins were found to be 2.3 and 2.8 for the young,and 2.9 to 3.1 for the adults. These data confirm that the studied form belongs to C. leuoas. Young occur regularly but in limited numbers.As regards the adults, however, females only appear during the short parturition period, i.e., from November to February. The number of embryos in the litters were from 7 to 9, their sizes ranging between 768-812 mm. The length of the smallest free young found was 697 mm, but young presumably 9 to 12 months old had 98 to 112 cm; between 21 and 24 months they were reaching 124 to 128 cm, that is, the same size they have when they start migrating to the open sea. The feeding inhibition phenomenon during the period of parturition was not observed in the female specimens caught in the lagoon. The more abundant species found in the stomach contents were: Arius spixii; Chloroscombrus chrysurus; A. grandicassus; A. barbus; Felichtys marinus; Genidens genidens; Chanophorus tajacica and Carcharhinus porosus.Noventa e um espécimes jovens e 3 fêmeas adultas de "cação cabeça chata" capturados na região lagunar de Cananeia foram examinados, constatando-se a fórmula dental 27/25 e número de vértebras pré-caudais entre 109 e 115.Verificouse que as proporções entre a la. nadadeira dorsal e a 2a. foram de 2.3 e 2.8 para os jovens e de 2.9 até 3.1 para os adultos.Ficou assim confirmado que a forma es tudada pertence a C. leuaas. É comum a ocorrência de jovens dentro da região estudada~ no entanto,quanto aos adultos,as fêmeas só são encontradas durante o período de parição, i.é, de novembro a fevereiro. Constatou-se que o número de embriões nas ninhadas foi de 7 a 9 e seus

  17. Composición y estructura de la ictiofauna del Río Ceballos-Saldán (Córdoba, Argentina Composition and structure of the icthyofauna of the Ceballos-Saldán River (Córdoba, Argentina

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    Romina Juncos

    Full Text Available Los ríos presentan un gradiente longitudinal desde su naciente hasta su desembocadura, con los consiguientes cambios en sus características ambientales y en la composición específica. El objetivo de este trabajo fue describir esa variación longitudinal en las características de la fauna de peces del Río Ceballos-Saldán. Los muestreos se realizaron en cinco puntos, ubicados antes y después de las ciudades más importantes, durante un año. Los ensambles de peces fueron descriptos a través de la composición específica, abundancia, riqueza, diversidad y dominancia, atributos que fueron estimados para cada localidad de muestreo. Se aplicaron diferentes modelos especie/abundancia a cada ensamble de peces a lo largo del curso. Se capturaron 1.914 individuos pertenecientes a 17 especies. Once corresponden a primeras citas para este río. El orden más representativo fue el de los Siluriformes y la especie más abundante fue Hypostomus cordovae (Günther, 1880. La abundancia total fue el único atributo que varió significativamente a lo largo del curso, siendo menor antes de la ciudad de Río Ceballos. Los ensambles de peces fueron significativamente descriptos por tres modelos diferentes de abundancia poblacional, a lo largo del río.Rivers show a longitudinal gradient from upstream to downstream, with consecutive changes in environmental characteristics and community composition. The main goal of this study was to describe the longitudinal variations in the characteristics of the fish fauna of Ceballos-Saldán River. Fish collection was performed at five sites along the river, before and after the main cities. Fish assemblages were described by specific composition, fish abundance, richness, diversity and dominance. These assemblage attributes were estimated for each sampling site. Species/abundance models were applied to each fish assemblage along the river. A total of 1,914 individuals were collected in Ceballos-Saldán River, which

  18. Evolutionary history of Otophysi (Teleostei, a major clade of the modern freshwater fishes: Pangaean origin and Mesozoic radiation

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    Saitoh Kenji

    2011-06-01

    Full Text Available Abstract Background Freshwater harbors approximately 12,000 fish species accounting for 43% of the diversity of all modern fish. A single ancestral lineage evolved into about two-thirds of this enormous biodiversity (≈ 7900 spp. and is currently distributed throughout the world's continents except Antarctica. Despite such remarkable species diversity and ubiquity, the evolutionary history of this major freshwater fish clade, Otophysi, remains largely unexplored. To gain insight into the history of otophysan diversification, we constructed a timetree based on whole mitogenome sequences across 110 species representing 55 of the 64 families. Results Partitioned maximum likelihood analysis based on unambiguously aligned sequences (9923 bp confidently recovered the monophyly of Otophysi and the two constituent subgroups (Cypriniformes and Characiphysi. The latter clade comprised three orders (Gymnotiformes, Characiformes, Siluriformes, and Gymnotiformes was sister to the latter two groups. One of the two suborders in Characiformes (Characoidei was more closely related to Siluriformes than to its own suborder (Citharinoidei, rendering the characiforms paraphyletic. Although this novel relationship did not receive strong statistical support, it was supported by analyzing independent nuclear markers. A relaxed molecular clock Bayesian analysis of the divergence times and reconstruction of ancestral habitats on the timetree suggest a Pangaean origin and Mesozoic radiation of otophysans. Conclusions The present timetree demonstrates that survival of the ancestral lineages through the two consecutive mass extinctions on Pangaea, and subsequent radiations during the Jurassic through early Cretaceous shaped the modern familial diversity of otophysans. This evolutionary scenario is consistent with recent arguments based on biogeographic inferences and molecular divergence time estimates. No fossil otophysan, however, has been recorded before the Albian, the

  19. Evolutionary history of Otophysi (Teleostei), a major clade of the modern freshwater fishes: Pangaean origin and Mesozoic radiation.

    Science.gov (United States)

    Nakatani, Masanori; Miya, Masaki; Mabuchi, Kohji; Saitoh, Kenji; Nishida, Mutsumi

    2011-06-22

    Freshwater harbors approximately 12,000 fish species accounting for 43% of the diversity of all modern fish. A single ancestral lineage evolved into about two-thirds of this enormous biodiversity (≈ 7900 spp.) and is currently distributed throughout the world's continents except Antarctica. Despite such remarkable species diversity and ubiquity, the evolutionary history of this major freshwater fish clade, Otophysi, remains largely unexplored. To gain insight into the history of otophysan diversification, we constructed a timetree based on whole mitogenome sequences across 110 species representing 55 of the 64 families. Partitioned maximum likelihood analysis based on unambiguously aligned sequences (9923 bp) confidently recovered the monophyly of Otophysi and the two constituent subgroups (Cypriniformes and Characiphysi). The latter clade comprised three orders (Gymnotiformes, Characiformes, Siluriformes), and Gymnotiformes was sister to the latter two groups. One of the two suborders in Characiformes (Characoidei) was more closely related to Siluriformes than to its own suborder (Citharinoidei), rendering the characiforms paraphyletic. Although this novel relationship did not receive strong statistical support, it was supported by analyzing independent nuclear markers. A relaxed molecular clock Bayesian analysis of the divergence times and reconstruction of ancestral habitats on the timetree suggest a Pangaean origin and Mesozoic radiation of otophysans. The present timetree demonstrates that survival of the ancestral lineages through the two consecutive mass extinctions on Pangaea, and subsequent radiations during the Jurassic through early Cretaceous shaped the modern familial diversity of otophysans. This evolutionary scenario is consistent with recent arguments based on biogeographic inferences and molecular divergence time estimates. No fossil otophysan, however, has been recorded before the Albian, the early Cretaceous 100-112 Ma, creating an over 100

  20. Fish associated with aquatic macrophytes in the Chacororé-Sinhá Mariana Lake system and Mutum River, Pantanal of Mato Grosso, Brazil Peixes associados a macrófitas aquáticas no sistema de baías Chacororé-Sinhá Mariana e rio Mutum, Pantanal - MT

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    EB. Pacheco

    2009-02-01

    Full Text Available On the left bank of the Cuibá River, one of the main tributaries of the Pantanal in Mato Grosso, are located the Chacororé and Sinhá Mariana Lakes and the Mutum River, the littoral regions of which are covered with aquatic macrophytes, dominated by the species Eichhornia crassipes and Eichhornia azurea. To examine the ichthyofauna associated with this vegetation, in the year 2003, 3510 fish were collected, distributed among 83 species, and the limnological variables verified near the macrophyte stands where they were sampled. The most abundant and richest order was the Characiformes, followed by the Gymnotiformes and Siluriformes. Analysis of similarity showed a very low, or null, index that the limnological conditions and morphology of the aquatic macrophyte species provide habitat sufficiently homogeneous to give. The limnological conditions and morphology of the aquatic macrophyte species provide a sufficient habitat heterogeneity to give very low, or null, index values. Thus, environmental conservation measures should be more effective in promoting the conservation of the species, given the high levels of biological diversity found in the habitats studied.À margem esquerda do rio Cuiabá, um dos principais afluentes do Pantanal matogrossense, estão localizadas as baías Chacororé e Sinhá Mariana e o rio Mutum, cujas regiões litorâneas são cobertas por macrófitas aquáticas. Com o intuito de se verificar a ictiofauna associada a esta vegetação, no ano de 2003, foram coletados 3510 peixes distribuídos em 83 espécies e verificados os valores das variáveis limnológicas próximo aos bancos de macrófitas onde estes foram amostrados. A ordem mais abundante e de maior riqueza foi Characiformes, seguida por Gymnotiformes e Siluriformes. As condições limnológicas e a morfologia das espécies de macrófitas proporcionam heterogeneidade de hábitat suficiente para obtenção de valores dos índices de similaridade baixos ou mesmo

  1. Stability and spatio-temporal structure in fish assemblages of two floodplain lagoons of the lower Orinoco River

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    Nirson González

    Full Text Available Fish assemblage structure and variability were analyzed in two floodplain lagoons (Las Arhuacas and Los Cardonales along the lower Orinoco over a hydrological cycle. Every three months during continuous three-day sampling, experimental gill nets (5 to 12.5 cm of mesh opening and 1 mm-mesh seine nets were utilized according to the types of habitats presents. A total of 133 fish species were found in Las Arhuacas and 95 species in Cardonales. Fifty five and 17 species were exclusive to Las Arhuacas and Los Cardonales respectively, and 77 were common to both lagoons. In Las Arhuacas, the most speciesrich orders were Characiformes, Siluriformes, Perciformes and Gymnotiformes and in Los Cardonales, the most species-rich orders were Characiformes, Siluriformes, Clupeiformes and Perciformes. The richness, abundance and biomass were significantly higher (p < 0.001 in Arhuacas than in Cardonales. In general, the fishes assemblage was highly variable during the high water phase and moderately stable during low water phase in both lagoons, with more stability or less variability in Cardonales than Arhuacas. Also, there were significant differences in the fish assemblages between the two lagoons, mainly during low waters (ANOSIM; p < 0.001. The species that contributed most to the mean dissimilarity between the lagoons were Hypostomus argus, Aphanotorulus ammophilus, Potamorhina altamazonica, Prochilodus mariae, Loricaria gr. cataphracta, Oxydoras sifontesi, Hydrolycus armatus, Hyphopthalmus edentatus and Pterodoras rivasi. The last four species were more commonly collected in Los Cardonales. Also, the species of small size (mainly SL < 5 cm such as Rhinosardinia amazonica, Moenkhausia sp. 1 "lepidura", Moenkhausia sp. 2, Aphyocharax alburnus, Characidium sp. 1, Moenkhausia sp. 3, Exodon paradoxus and Roeboides dientonito contributed to the mean dissimilarity among the beach and aquatic vegetation habitats. The patterns of the species assemblage

  2. Diet of Lontra longicaudis (Carnivora: Mustelidae in a pool system in Atlantic Forest of Minas Gerais State, southeastern Brazil=Dieta de Lontra longicaudis (Carnivora: Mustelidae em um sistema de poções na Floresta Atlântica do Estado de Minas Gerais, sudeste do Brasil

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    Fernando Marques Quintela

    2012-10-01

    Full Text Available The present study aimed to investigate the feeding habits of Lontra longicaudis in a pool system within the Private Reserve of Natural Patrimony (RPPN Usina Maurício, located in Paraíba do Sul river basin, Atlantic Forest of southeastern Minas Gerais State. The diet composition was determined based on the identification of items present in 212 scats sampled between July 2008 and October 2009 in a 4.1 km stretch of the pool system. The found items and its respective percentages of occurrence were: mollusks (0.5%, insects (16.5%, spiders (1.4%, crustaceans (3.3%, fish (96.7%, amphibians (0.9%, snakes (3.8%, birds (2.8%, mammals (8.5% and fruits (0.5%. Among fish, the identified families and respective percentages of occurrence were: Loricariidae (65.4%, Pimelodidae (42.9% Cichlidae (22%, Characidae (7.3%, Erythrinidae (3.9%, Synbranchidae (2.4%, Anostomidae (2%. Therefore fish make up the most consumed item in the study area, with the predominance of benthic siluriformes (families Loricariidae and Pimelodidae. O presente estudo teve como objetivo investigar os hábitos alimentares de Lontra longicaudis em um sistema de poções na Reserva Particular do Patrimônio Natural – RPPN Usina Maurício, localizada na bacia do rio Paraíba do Sul, Mata Atlântica do Sudeste do Estado de Minas Gerais. A composição da dieta foi determinada com base na identificação de itens presentes em 212 amostras de fezes coletadas entre julho de 2008 e outubro de 2009 em um trecho de 4,1 km de um sistema de poções. Os itens alimentares encontrados e suas respectivas porcentagens de ocorrência foram: moluscos (0,5%, insetos (16,5%, aranhas (1,4%, crustáceos (3,3%, peixes (96,7%, anfíbios (0,9%, serpentes (3,8%, aves (2,8%, mamíferos (8,5%, frutos (0,5%. Dentre os peixes, famílias identificadas e suas respectivas porcentagens de ocorrência foram: Loricariidae (65,4%, Pimelodidae (42,9% Cichlidae (22%, Characidae (7,3%, Erythrinidae (3,9%, Synbranchidae (2

  3. The fish fauna in tropical rivers: The case of the Sorocaba river basin, SP, Brazil

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    Welber Senteio Smith

    2003-09-01

    Full Text Available A survey was carried out on the fish species in the Sorocaba River basin, the main tributary of the left margin of the Tietê River, located in the State of São Paulo, Brazil. The species were collected with gill nets. After identification of the specimens, their relative abundance, weight and standard length were determined. Up to the present moment there are not any studies that focus this subject in this hydrographic basin. Fifty-three species, distributed in eighteen families and six orders were collected. Characiformes were represented by twenty-eight species, Siluriformes by seventeen species, the Gymnotiformes by three species, Perciformes and Cyprinodontiformes by two species, and the Synbranchiformes by one species. Among the collected species there were two exotic. The most abundant species were Astyanax fasciatus and Hypostomus ancistroides. In relation to total weight the most representative species were Hoplias malabaricus and Hypostomus ancistroides. Cyprinus carpio, Prochilodus lineatus, Schizodon nasutus and Hoplias malabaricus were the most representative species in relation to average weight. Largest standard length were recorded for Sternopygus macrurus, Steindachnerina insculpta, Eigenmannia aff. virescens and Cyprinus carpioSe realizó un análisis de las especies de peces de la cuenca del Río Sorocaba, el principal tributario de la margen izquierda del Río Tietê, localizado en el estado de Sao Paulo, Brasil. Las especies fueron recolectadas con redes agalleras. Luego de la identificación de los especímenes, fue determinada su abundancia relativa, peso, y longitud estandar. Hasta el presente, no hay ningún otro estudio que analice estos aspectos en dicha cuenca hidrográfica. Fueron recolectados 55 especies, distribuidas en 18 familias y 6 ordenes. Los Characiformes estuvieron representados por 28 especies, Siluriformes por 17 especies, Gymnotiformes por 3 especies, Perciformes y Cyprinodontiformes por 2 especies, y

  4. The use of semen evaluation and assisted reproduction in Spix's macaws in terms of species conservation.

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    Fischer, Dominik; Neumann, Daniel; Purchase, Cromwell; Bouts, Tim; Meinecke-Tillmann, Sabine; Wehrend, Axel; Lierz, Michael

    2014-01-01

    The Spix's macaw (Cyanopsitta spixii) is the rarest parrot on earth. The remaining captive population consists of 79 individuals. Captive propagation is ongoing to increase the number of individuals for future reintroduction back into the wild. Unfortunately, from 2004 to 2012, only 33 chicks hatched from 331 eggs. Semen evaluation and assisted reproduction might help to overcome this problem. Therefore, a recently developed electro-stimulated semen collection technique was used in Spix's macaws. Semen collection was successful in 39 of 78 attempts in 10 out of 17 males. Examination of the semen included evaluation of volume, color, consistency, contaminations and pH, as well as determination of motility, viability, morphology, concentration, and total count of spermatozoa. The median volume of semen samples was 5.6 µl. On average, 34.7 ± 21.9% (median 30%) of the sperm were motile and 23.1 ± 22.1% (median 16.5%) were progressively motile. In addition to spermatozoa, round cells were detected in the samples. Median sperm concentration was 15,500/µl (range 500-97,500/µl) and median viability was 50% (range 5-87%). Morphological examination revealed in 26.5% normal spermatozoa, high numbers of malformations of the head (50.2%) and tail region (20.5%), with 29% of all sperm showing multiple abnormalities. Artificial insemination was performed in three females; two eggs laid after artificial insemination had spermatozoa present on the perivitelline layer, suggesting the possible success of the insemination technique. Although no fertilization could be demonstrated, these preliminary results are promising, as they indicate that assisted reproduction might be a tool for species conservation in the Spix's macaw. © 2014 Wiley Periodicals Inc.

  5. Linking fishery management and conservation in a tropical estuarine lagoon: biological and physical effects of an artisanal fishing gear

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    Rueda, M.; Defeo, O.

    2003-04-01

    Information coming from fishery monitoring, surveys and experimental fishing with participation of fishers was employed to determine the impact of an artisanal gear, 'boliche', on the biodiversity of the Ciénaga Grande de Santa Marta (CGSM), an estuarine lagoon on the Caribbean coast of Colombia. Fishery monitoring (catch data) included landings before (1968 and 1978) and after (1994-1996) the introduction of the boliche in the CGSM (1985), whereas surveys were conducted seasonally during 1993-1994. Fishing experiments involved evaluating different mesh sizes and the short-term effect of physical disturbance by the boliche. Monitoring suggested potential trophic effects of this fishing gear: the catch of large, long-lived, carnivorous species declined after the introduction of the boliche in the CGSM, whereas catch rates of smaller, shorter-lived, and lower trophic level species increased. Surveys revealed that the boliche retained 41 species. The by-catch made up 62% of the total catch and the remaining 38% involved the three target species Eugerres plumieri, Mugil incilis and Cathorops spixii. Selectivity experiments showed that 2.5 in. stretched mesh size gill nets caught more species than the 3.0-in. mesh. The smaller mesh also increased the risk of a critical reduction in the spawning stock of target species (notably E. plumieri); a situation that could affect the fish community if mesh sizes lower than 2.5 in. were intensively used. Suspended particulate matter significantly increased after fishing activity, with higher resuspension on mud-shells and mud substrata, whereas dissolved oxygen showed no appreciable changes after fishing operations. Notwithstanding, the activity of the boliche would generate sediment resuspension between 382 and 470 t day -1, which could lead to potential cascade impacts on water quality. We propose a framework of redundancy in management measures in order to simultaneously reach management and conservation goals.

  6. Diversity of Micrurus Snake Species Related to Their Venom Toxic Effects and the Prospective of Antivenom Neutralization

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    Tanaka, Gabriela D.; Furtado, Maria de Fátima D.; Portaro, Fernanda C. V.; Sant'Anna, Osvaldo Augusto; Tambourgi, Denise V.

    2010-01-01

    Background Micrurus snake bites can cause death by muscle paralysis and respiratory arrest, few hours after envenomation. The specific treatment for coral snake envenomation is the intravenous application of heterologous antivenom and, in Brazil, it is produced by horse immunization with a mixture of M. corallinus and M. frontalis venoms, snakes that inhabit the South and Southeastern regions of the country. However, this antivenom might be inefficient, considering the existence of intra- and inter-specific variations in the composition of the venoms. Therefore, the aim of the present study was to investigate the toxic properties of venoms from nine species of Micrurus: eight present in different geographic regions of Brazil (M. frontalis, M. corallinus, M. hemprichii, M. spixii, M. altirostris, M. surinamensis, M. ibiboboca, M. lemniscatus) and one (M. fulvius) with large distribution in Southeastern United States and Mexico. This study also analyzed the antigenic cross-reactivity and the neutralizing potential of the Brazilian coral snake antivenom against these Micrurus venoms. Methodology/Principal Findings Analysis of protein composition and toxicity revealed a large diversity of venoms from the nine Micrurus species. ELISA and Western blot assays showed a varied capability of the therapeutic antivenom to recognize the diverse species venom components. In vivo and in vitro neutralization assays indicated that the antivenom is not able to fully neutralize the toxic activities of all venoms. Conclusion These results indicate the existence of a large range of both qualitative and quantitative variations in Micrurus venoms, probably reflecting the adaptation of the snakes from this genus to vastly dissimilar habitats. The data also show that the antivenom used for human therapy in Brazil is not fully able to neutralize the main toxic activities present in the venoms from all Micrurus species occurring in the country. It suggests that modifications in the

  7. Reconhecimento de frações do veneno de cobras corais brasileiras pelo soro antielapídico = Recognition of venom fractions from Brazilian coral snakes by antielapid serum

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    Vidal, Bruno Prado Cortizo

    2015-01-01

    Full Text Available Objetivos: Investigar a capacidade do soro antielapídico produzido no Brasil na identificação de frações do veneno de seis espécies, incluindo as que constituem o pool de inoculação: Micrurus brasiliensis, M. corallinus, M. frontalis, M. lemniscatus, M. spixii e M. surinamensis. Métodos: As amostras utilizadas fazem parte do banco de venenos do Centro de Estudos e Pesquisas Biológicas, da Pontifícia Universidade Católica de Goiás. O soro antielapídico foi cedido pela Fundação Ezequiel Dias. As metodologias empregadas foram eletroforese e imunoblotting. Resultados: Foi demonstrada uma variabilidade toxinológica e uma capacidade também variável de reconhecimento desses componentes pelo soro antielapídico. A partir da técnica de western-blotting o soro antielapídico da Fundação Ezequiel Dias foi capaz de reconhecer a maioria, mas não todos os componentes presentes nos venenos analisados. Conclusões: Os resultados sugerem uma eficácia restrita do soro antielapídico já que o mesmo possui limitações quanto as espécies Amazônicas, o que reforça a necessidade de uma revisão dos estudos intra e interespecíficos dos venenos micrúricos

  8. Morfometría de las especies de Vieja (Cichlidae en ríos de la cuenca del Usumacinta, Chiapas, México Morphometry of Vieja species (Cichlidae in rivers of Usumacinta's basin, Chiapas, Mexico

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    Miriam Soria-Barreto

    2011-06-01

    Full Text Available Se evaluaron y compararon diversas características morfológicas de 6 especies de Vieja Fernández-Yépez, 1969 del río Usumacinta. Se emplearon 20 organismos adultos por especie y 33 medidas corporales que fueron estandarizadas y examinadas con un análisis discriminante. Además se comparó la forma del cuerpo entre las especies, mediante el análisis de morfometría geométrica a partir de imágenes digitalizadas. El análisis con la morfometría tradicional y geométrica permitió diferenciar los seis taxones. Se encontraron 10 medidas discriminantes, que expresan diferencias significativas en la longitud de las aletas y la región cefálica, de las cuales la posición de la boca diferenció estadísticamente más taxones. Las relaciones de similitud con ambos análisis mostraron 2 grupos, siendo V. bifasciata (Steindachner, 1864 y V. synspila (Hubbs, 1935 las especies más parecidas. Las gradillas de deformación mostraron que la mayor variación está en la región cefálica, específicamente en la posición de la boca y los ojos. Las diferencias morfométricas encontradas pueden servir para la determinación taxonómica en trabajos futuros. La variación encontrada en la morfología cefálica y trófica puede ser un mecanismo que favorece la coexistencia de las especies y la diversidad del grupo en la región.We evaluated and compared morphological characteristics among the 6 species of Vieja Fernández-Yépez, 1969 from Usumacinta River. We analyzed 20 adults by specie, obtaining 33 measurements, which were standardized and analyzed with a discriminant analysis. We also performed a comparison of body shape among species, using the geometric morphometric analysis from digitalized images. Traditional and geometric morphometrics allowed distinguishing each taxa. We found 10 discriminants measures, related with the head region and length of fins, only mouth position was different among more taxa. In both analyses, similarity relationships

  9. Ecologia da comunidade de metazoários parasitos da Maria-Luiza, Paralonchurus brasiliensis (Osteichthyes: Sciaenidae do litoral do Estado do Rio de Janeiro, Brasil - DOI: 10.4025/actascibiolsci.v25i2.2009 Community ecology of the metazoan parasites of Banded Croaker, Paralonchurus brasiliensis (Osteichthyes: Sciaenidae, from the coastal zone of the State of Rio de Janeiro, Brazil- DOI: 10.4025/actascibiolsci.v25i2.2009

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    Renata da Silva Ribeiro

    2003-04-01

    Full Text Available Foram examinados 93 espécimes de Paralonchurus brasiliensis (Steindachner, 1875, provenientes da Pedra de Guaratiba (23º01’S, 43º38’W litoral do Estado do Rio de Janeiro, Brasil. No período de setembro de 2001 até março de 2002, sendo necropsiados para estudo da sua comunidade de metazoários parasitos. Quinze espécies de parasitos foram coletadas. Paralonchurus brasiliensis é um novo registro de hospedeiro para 13 espécies de parasitos. Contracaecum sp. foi a espécie dominante, com os maiores índices de prevalência e abundância parasitária. Os componentes da comunidade parasitária de P. brasiliensis apresentaram o típico padrão de distribuição superdispersa. A abundância e a prevalência de Procamallanus (Spirocamallus pereirai apresentaram correlação positiva com o comprimento total do hospedeiro. A abundância de Contracaecum sp. apresentou correlação positiva com o comprimento total do hospedeiro. Um par de endoparasitos adultos (Aponurus laguncula - Procamallanus (S. pereirai apresentou covariação negativa e um par de estágios larvais de endoparasitos apresentou covariação positiva entres as abundâncias. Paralonchurus brasiliensis apresentou uma comunidade de metazoários parasitos composta de espécies generalistas, pouco ordenadas e com poucas evidências de associações interespecíficas. Este padrão está em concordância com os estudos realizados com comunidades parasitárias de siaenídeos da região neotropicalNinety-three specimens of banded croaker, Paralonchurus brasiliensis (Steindachner, 1875, collected from Pedra de Guaratiba (23º01’S, 43º38’W, coastal zone, State of Rio de Janeiro, Brazil, between September 2001 and March 2002, were necropsied to study their infracommunities of metazoan parasites. Fifteen species of metazoan parasites were collected. Paralonchurus brasiliensis is a new host record for 13 parasite species. The majority of fishes were parasitized by one or more metazoan

  10. Espectro trófico de la tilapia Oreochromis aureus (Perciformes: Cichlidae en la presa Infiernillo, Michoacán-Guerrero, México

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    Ma. de Lourdes Jiménez-Badillo

    2000-06-01

    Full Text Available Se determinó el espectro trófico de la tilapia Oreochromis aureus (Steindachner 1864, a través del análisis del contenido estomacal de una muestra de 153 especímenes recolectados durante 1993. El estado de alimentación se evaluó por la proporción de grasa alrededor del estómago e intestino, la replexión gástrica y el coeficiente de condición. La evaluación cuantitativa del alimento, se realizó a través de los métodos Volumétrico (V y Frecuencia de Aparición (FA y los Indices Medio Volumétrico (IMV e Importancia Relativa (IIR, los cuales se combinaron para determinar el espectro trófico de la tilapia. Se determinó que su dieta en la presa Infiernillo está constituida por: detritus y plantas vasculares como alimentos preferentes; algas unicelulares como alimento secundario y peces, insectos, semillas de gramíneas, algas filamentosas, cladóceros, ostrácodos, rotíferos y copépodos, como alimentos ocasionales. Se detectaron diferencias alimentarias entre juveniles y adultos y variaciones en el consumo de elementos alimentarios en la época de secas y lluvias. Se concluye que Oreochromis aureus es una especie omnívora con preferencia hacia el detritus y los restos de plantas vasculares. La alimentación esta determinada por la abundancia de las presas en el medio y en los adultos se basa preferentemente en el detritus. La alimentación no es un factor que limite el desarrollo de la tilapia en la presa Infiernillo.The trophic spectrum of tilapia Oreochromis aureus (Steindachner 1864, was determined by stomach content analysis in 153 organisms collected during 1993 in Michoacán-Guerrero, México. The feeding status of the fish at the time of observation was evaluated by the examination of fat surrounding the gut, gastric replection and the condition coefficient. The quantitative evaluation of the food items was carried out by the combination of the following analysis: Frequency of Occurrence, Volumetric Method, Volumetric

  11. Ecotoxicological analysis during the removal of carbofuran in fungal bioaugmented matrices.

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    Ruíz-Hidalgo, Karla; Masís-Mora, Mario; Barbieri, Edison; Carazo-Rojas, Elizabeth; Rodríguez-Rodríguez, Carlos E

    2016-02-01

    Biomixtures are used for the removal of pesticides from agricultural wastewater. As biomixtures employ high content of lignocellulosic substrates, their bioaugmentation with ligninolytic fungi represents a novel approach for their enhancement. Nonetheless, the decrease in the concentration of the pesticide may result in sublethal concentrations that still affect ecosystems. Two matrices, a microcosm of rice husk (lignocellulosic substrate) bioaugmented with the fungus Trametes versicolor and a biomixture that contained fungally colonized rice husk were used in the degradation of the insecticide/nematicide carbofuran (CFN). Elutriates simulating lixiviates from these matrices were used to assay the ecotoxicological effects at sublethal level over Daphnia magna (Straus) and the fish Oreochromis aureus (Steindachner) and Oncorhynchus mykiss (Walbaum). Elutriates obtained after 30 d of treatment in the rice husk microcosms at dilutions over 2.5% increased the offspring of D. magna as a trade-off stress response, and produced mortality of neonates at dilutions over 5%. Elutriates (dilution 1:200) obtained during a 30 d period did not produce alterations on the oxygen consumption and ammonium excretion of O. mykiss, however these physiological parameters were affected in O. aureus at every time point of treatment, irrespective of the decrease in CFN concentration. When the fungally colonized rice husk was used to prepare a biomixture, where more accelerated degradation is expected, similar alterations on the responses by O. aureus were achieved. Results suggest that despite the good removal of the pesticide, it is necessary to optimize biomixtures to minimize their residual toxicity and potential chronic effects on aquatic life. Copyright © 2015 Elsevier Ltd. All rights reserved.

  12. The impact of a biomanipulation experiment on the ichthyofauna diet from a neotropical reservoir in Brazilian semiarid

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    Cristiane de Carvalho Ferreira Lima Moura

    2018-04-01

    Full Text Available Abstract Aim To evaluate the impact of a biomanipulation experiment on the feeding of fish species from a neotropical semiarid reservoir, before and after the removal of the exotic species Oreochromis niloticus. Methods The values of Food Index were analyzed for six species: Oreochromis niloticus , Prochilodus brevis Steindachner,1875, Hypostomus cf. paparie Fowler,1941, Hoplias gr. malabaricus Bloch,1794, Astyanax bimaculatus Linnaeus,1758 and Leporinus piau Fowler,194. All data were obtained in two periods, before of the removal O. niloticus (May 2012 to January 2013 and after its removal (April 2013 to November 2013. The Morisita-Horn index was used to evaluate the feeding similarity among the six species and determine trophic categories (insectivorous, omnivorous, iliophaga and piscivora. To establish the probable variations due the presence of O. niloticus species, the Food Index of the six species was used in a Bray-Curtis similarity matrix. Through the Non-metric Multidimensional Scaling (NMDS we could not observe any differences among items consumed by different species. The Canonical Correspondence Analysis (CCA was used to assay the influence of environmental variables on the dietary, from the Food Index data. Results All species were classified in four trophic categories that do not shown any variation among the formed groups during studied periods. After the removal of Nile tilapia some species showed changes in food items, according to NMDS. The CCA indicated low association among the monthly Food Index of species and the environmental changes. Conclusion The process of biomanipulation on the Ecological Station from Serra Negra reservoir, which compares the dietaries from five local species before and after removal of exotic species Oreochromis niloticus, resulted in modification of dietary composition from three of five studied species.

  13. The relationship between habitat complexity and nursery provision for an estuarine-dependent fish species in a permanently open South African Estuary

    Science.gov (United States)

    Leslie, Timothy; James, Nicola C.; Potts, Warren M.; Rajkaran, Anusha

    2017-11-01

    Estuarine-dependent marine fish species rely on shallow, sheltered and food rich habitats for protection from predators, growth and ultimately recruitment to adult populations. Hence, habitats within estuaries function as critical nursery areas for an abundance of fish species. However, these habitats vary in the degree of nursery function they provide and few studies have quantitatively assessed the relative nursery value of different habitat types within estuaries, particularly in the context of habitat complexity. This study aimed to assess the nursery value of the dominant vegetated habitats, namely the submergent Zostera capensis (Setch.) (seagrass) beds and emergent Spartina maritima (Curtis) Fernald (salt marsh) beds in the Bushmans Estuary, South Africa. Biomass and stem density were sampled seasonally in order to gain insight into the vegetation dynamics of seagrass and salt marsh beds. Aerial cover, canopy height and underwater camera imagery were used to develop multiple complexity indices for prioritizing habitat complexity. The relatively consistent results of the dimensionless indices (interstitial space indices and fractal geometry) suggest that Z. capensis exhibits an overall greater degree of complexity than S. maritima, and hence it can be expected that fish abundance is likely to be higher in Z. capensis beds than in S. maritima habitats. Underwater video cameras were deployed in seagrass, salt marsh and sand flat habitats to assess the relative abundance and behaviour of the estuarine-dependent sparid Rhabosargus holubi (Steindachner 1881) in different habitats. The relative abundance of R. holubi was significantly higher in Z. capensis seagrass than S. maritima salt marsh and sand flats, whilst the behaviour of R. holubi indicated a high degree of habitat use in structured habitats (both Z. capensis and S. martima) and a low degree of habitat use in unstructured sand flat habitats.

  14. Functional trophic composition of the ichthyofauna of forest streams in eastern Brazilian Amazon

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    Gabriel Lourenco Brejao

    2013-06-01

    Full Text Available This study aimed to describe the functional organization of the ichthyofauna of forest streams from northeastern Pará State, Brazil, based on behavioral observation of species' feeding tactics. Seven streams were sampled between June and November, 2010, during snorkeling sessions, totaling 91h 51min of visual censuses at day, dusk, and night periods. Seventy three species distributed in six orders, 26 families and 63 genera were observed, with dominance of Characiformes, followed by Siluriformes. From information gathered by ad libitum observations, each species was included in one of 18 functional trophic groups (FTGs, according to two main characteristics: (1 its most frequently observed feeding tactic; and (2 its spatial distribution in the stream environment, considering their horizontal (margins or main channel and vertical (water column dimensions. The most frequent FTGs observed were Nocturnal invertebrate pickers (9 species, Diurnal channel drift feeders (8 spp., Diurnal surface pickers (7 spp., and Ambush and stalking predators (6 spp.. The FTGs herein defined enable a comparative analysis of the structure and composition of ichthyofauna in different basins and environmental conditions, which presents an alternative approach to the use of taxonomic structure in ecological studies. The ichthyofauna classification based in FTGs proposed in this study is compared to three other classifications, proposed by Sazima (1986, Sabino & Zuanon (1998 and Casatti et al. (2001.

  15. Caracterización espeleológica e inventario biológico de la Caverna del Diablo en el municipio de Becerril, Departamento del Cesar, Colombia

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    Frederick Vides-Navarro

    2015-07-01

    Full Text Available Objective: This study aims to characterize the most important aspects of the Devil´s cave, including biophysical, geological, speleological and morphological components. Methods: A descriptive research from observations in situ, specific technical work of topography, geology, speleology and biology, along with study of related literature has been conducted. Results: The methods used allowed us to learn about the natural richness inside the cave, with outstanding karst landforms (speleothems, presence of fish, crustaceans and other organisms that might be endemic. The information obtained indicates that the origin of the cavity is due to fluvial erosion processes and forced circulation of streams, evidenced in its shaped rosary surface on the interior walls of the structure. Landforms are mostly at the entrance of the cavity in varieties like Stalactites, Castings, Sandsicles and Gours. The biophysical component is the most distinctive aspect of the cave, consisting in a good dynamic of ventilation, permanent presence of water, high humidity and variety of wildlife, including taxa as Chiroptera, Araneae, Anura, Lepidoptera, Blattodea stand, Rodents, Oligochaeta, Dermaptera, siluriform and Decapods. Conclusions: Lithologically, the cavity is framed in limestone rocks rich in organic matter with variation in surface color belonging to the La Luna Formation, the low humidity of the cavity at its entrance and high carbonate content favored the formation of large numbers of speleothems. The inside observations and studies on the water stream showed that biophysical conditions of this place are suitable to house a rich diversity of wildlife.

  16. Prediction of Toxin Genes from Chinese Yellow Catfish Based on Transcriptomic and Proteomic Sequencing

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    Bing Xie

    2016-04-01

    Full Text Available Fish venom remains a virtually untapped resource. There are so few fish toxin sequences for reference, which increases the difficulty to study toxins from venomous fish and to develop efficient and fast methods to dig out toxin genes or proteins. Here, we utilized Chinese yellow catfish (Pelteobagrus fulvidraco as our research object, since it is a representative species in Siluriformes with its venom glands embedded in the pectoral and dorsal fins. In this study, we set up an in-house toxin database and a novel toxin-discovering protocol to dig out precise toxin genes by combination of transcriptomic and proteomic sequencing. Finally, we obtained 15 putative toxin proteins distributed in five groups, namely Veficolin, Ink toxin, Adamalysin, Za2G and CRISP toxin. It seems that we have developed a novel bioinformatics method, through which we could identify toxin proteins with high confidence. Meanwhile, these toxins can also be useful for comparative studies in other fish and development of potential drugs.

  17. Hepatic retinoid levels in seven fish species (teleosts) from a tropical coastal lagoon receiving effluents from iron-ore mining and processing.

    Science.gov (United States)

    Pereira, Adriana A; van Hattum, Bert; Brouwer, Abraham

    2012-02-01

    The present study was undertaken to investigate the possible effects of Fe and trace element exposure on hepatic levels of retinoids in seven fish species. Concentrations of retinoids were measured in fish collected from a coastal lagoon in Brazil that receives effluents from an iron-ore mining and processing plant. Fish from nearby coastal lagoons were also included to assess possible differences related to chemical exposure. Results indicated considerable differences in hepatic retinoid composition among the various species investigated. The most striking differences were in retinol and derivative-specific profiles and in didehydro retinol and derivative-specific profiles. The Perciformes species Geophagus brasiliensis, Tilapia rendalli, Mugil liza, and Cichla ocellaris and the Characiforme Hoplias malabaricus were characterized as retinol and derivative-specific, while the Siluriformes species Hoplosternum littorale and Rhamdia quelen were didehydro retinol and derivative-specific fish species. A negative association was observed between Al, Pb, As, and Cd and hepatic didehydro retinoid levels. Fish with higher levels of hepatic Fe, Cu, and Zn showed unexpectedly significant positive correlations with increased hepatic retinol levels. This finding, associated with the positive relationships between retinol and retinyl palmitate with lipid peroxidation, may suggest that vitamin A is mobilized from other tissues to increase hepatic antioxidant levels for protection against oxidative damage. These data show significant but dissimilar associations between trace element exposure and hepatic retinoid levels in fish species exposed to iron-ore mining and processing effluents, without apparent major impacts on fish health and condition. Copyright © 2011 SETAC.

  18. Preliminary study of some environmental and ecological aspects of the communities of fish and aquatic macro-invertebrates in the Tutunendo River, Choco, Colombia

    International Nuclear Information System (INIS)

    Torres, Yenecith; Roldan, Gabriel; Asprilla, Sonia; Rivas, Tulia Sofia

    2006-01-01

    From June to October 2003 studies related to environmental and ecological aspects of fishes and macro-invertebrates in three sampling stations of Tutunendo River located in the Department of Choco, Colombia, were carried out. Abiotic factors like conductivity, pH, oxygen and temperature were also measured. Eighty one hundred fish specimens, belonging to three orders, seven families and twelve species were collected. The order Siluriformes presented the greatest abundance (70.72%) with three families, seven species and 128 specimens, followed by Characiformes with three families, three species and 43 specimens (23.53%). At the same time 1.211 aquatic macro-invertebrates were collected represented by the orders Ephemeroptera (50.28%), Odonata (11.40%), Coleoptera (8.67%), Hemiptera (8.42%), Trichoptera (7.30%), Plecoptera (5.7%), Megaloptera (3.3%), Lepidoptera (2.31%), Diptera (0.37%) and Haplotaxida (0.08%). The families Leptophlebiidae (37.24%), followed by Naucoridae (8.42%) and Baetidae (8%) were the most represented. Relationship between fishes and macro invertebrates as food items in Geophagus pellegrini and Astyanaxfasciatus were also studied. G. pellegrini was zooplanctophage with preference for Baetidae, Leptohyphidae, Hydrobiosidae, Leptoceridae and Naucoridae. Finally, the present work indicated that Tutunendo town does not have potential fishery; the economy is supported in productive traditional systems based in the agriculture, complemented with fishery and extractive activities

  19. The ichthyofauna of limnic systems in Quaternary deposits of extreme southern Brazil

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    Cindy Marques

    2016-12-01

    Full Text Available The Quaternary in the state of Rio Grande do Sul (RS, southern Brazil, is geologically represented by the coastal plain and was originated by successive events of Pleistocene-Holocene marine transgressions and the occurrence of alluvial deposits. This paper aimed to characterize the fish assemblage occurring in a swampy Quaternary area adjacent to Lagoa Pequena, a lacustrine system connected to the west margin of the Laguna dos Patos estuary. A checklist is also provided of the ichthyofauna so far recorded in limnic systems of Quaternary deposits in the state of Rio Grande do Sul. A total of 42 species was recorded, distributed in nine orders, 18 families and 31 genera. Characidae and Cichlidae were the most representative families, comprising 15 and 4 species respectively. A bibliographic revision associated to our sample data revealed the occurrence of 156 species in limnic systems inserted in RS Quaternary deposits (114 limnic, 15 marine/estuarine/limnic, ten marine/estuarine, nine estuarine/limnic and eight marine. Characiformes and Siluriformes are the most diverse orders, corroborating the Neotropical pattern. Seven species can be considered endemic to RS Quaternary deposits.

  20. Fish associated with aquatic macrophytes in the Chacororé-Sinhá Mariana Lake system and Mutum River, Pantanal of Mato Grosso, Brazil.

    Science.gov (United States)

    Pacheco, E B; Da-Silva, C J

    2009-02-01

    On the left bank of the Cuibá River, one of the main tributaries of the Pantanal in Mato Grosso, are located the Chacororé and Sinhá Mariana Lakes and the Mutum River, the littoral regions of which are covered with aquatic macrophytes, dominated by the species Eichhornia crassipes and Eichhornia azurea. To examine the ichthyofauna associated with this vegetation, in the year 2003, 3510 fish were collected, distributed among 83 species, and the limnological variables verified near the macrophyte stands where they were sampled. The most abundant and richest order was the Characiformes, followed by the Gymnotiformes and Siluriformes. Analysis of similarity showed a very low, or null, index that the limnological conditions and morphology of the aquatic macrophyte species provide habitat sufficiently homogeneous to give. The limnological conditions and morphology of the aquatic macrophyte species provide a sufficient habitat heterogeneity to give very low, or null, index values. Thus, environmental conservation measures should be more effective in promoting the conservation of the species, given the high levels of biological diversity found in the habitats studied.

  1. Convergence among cave catfishes: long-branch attraction and a Bayesian relative rates test.

    Science.gov (United States)

    Wilcox, T P; García de León, F J; Hendrickson, D A; Hillis, D M

    2004-06-01

    Convergence has long been of interest to evolutionary biologists. Cave organisms appear to be ideal candidates for studying convergence in morphological, physiological, and developmental traits. Here we report apparent convergence in two cave-catfishes that were described on morphological grounds as congeners: Prietella phreatophila and Prietella lundbergi. We collected mitochondrial DNA sequence data from 10 species of catfishes, representing five of the seven genera in Ictaluridae, as well as seven species from a broad range of siluriform outgroups. Analysis of the sequence data under parsimony supports a monophyletic Prietella. However, both maximum-likelihood and Bayesian analyses support polyphyly of the genus, with P. lundbergi sister to Ictalurus and P. phreatophila sister to Ameiurus. The topological difference between parsimony and the other methods appears to result from long-branch attraction between the Prietella species. Similarly, the sequence data do not support several other relationships within Ictaluridae supported by morphology. We develop a new Bayesian method for examining variation in molecular rates of evolution across a phylogeny.

  2. Gene structure and functional characterization of growth hormone in dogfish, Squalus acanthias.

    Science.gov (United States)

    Moriyama, Shunsuke; Oda, Mayumi; Yamazaki, Tomohide; Yamaguchi, Kiyoko; Amiya, Noriko; Takahashi, Akiyoshi; Amano, Masafumi; Goto, Tomoaki; Nozaki, Masumi; Meguro, Hiroshi; Kawauchi, Hiroshi

    2008-06-01

    Dogfish (Squalus acanthias) growth hormone (GH) was identified by cDNA cloning and protein purification from the pituitary gland. Dogfish GH cDNA encoded a prehormone of 210 amino acids (aa). Sequence analysis of purified GH revealed that the prehormone is composed of a signal peptide of 27 aa and a mature protein of 183 aa. Dogfish GH showed 94% sequence identity with blue shark GH, and also showed 37-66%, 26%, and 48-67% sequence identity with GH from osteichtyes, an agnathan, and tetrapods. The site of production was identified through immunocytochemistry to be cells of the proximal pars distalis of the pituitary gland. Dogfish GH stimulates both insulin-like growth factor-I and II mRNA levels in dogfish liver in vitro. The dogfish GH gene consisted of five exons and four introns, the same as in lamprey, teleosts such as cypriniforms and siluriforms, and tetrapods. The 5'-flanking region within 1082 bp of the transcription start site contained consensus sequences for the TATA box, Pit-1/GHF-1, CRE, TRE, and ERE. These results show that the endocrine mechanism for growth stimulation by the GH-IGF axis was established at an early stage of vertebrate evolution, and that the 5-exon-type gene organization might reflect the structure of the ancestral gene for the GH gene family.

  3. Morphology of the epidermis of the neotropical catfish Pimelodella lateristriga (Lichtenstein, 1823 with emphasis in club cells.

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    Eduardo Medeiros Damasceno

    Full Text Available The epidermis of Ostariophysi fish is composed of 4 main cell types: epidermal cells (or filament containing cells, mucous cells, granular cells and club cells. The morphological analysis of the epidermis of the catfish Pimelodella lateristriga revealed the presence of only two types of cells: epidermal and club cells. The latter were evident in the middle layer of the epidermis, being the largest cells within the epithelium. Few organelles were located in the perinuclear region, while the rest of the cytoplasm was filled with a non-vesicular fibrillar substance. Club cells contained two irregular nuclei with evident nucleoli and high compacted peripheral chromatin. Histochemical analysis detected prevalence of protein within the cytoplasm other than carbohydrates, which were absent. These characteristics are similar to those described to most Ostariophysi studied so far. On the other hand, the epidermal cells differ from what is found in the literature. The present study described three distinct types, as follows: superficial, abundant and dense cells. Differences among them were restricted to their cytoplasm and nucleus morphology. Mucous cells were found in all Ostariophysi studied so far, although they were absent in P. lateristriga, along with granular cells, also typical of other catfish epidermis. The preset study corroborates the observations on club cells' morphology in Siluriformes specimens, and shows important differences in epidermis composition and cell structure of P. lateristriga regarding the literature data.

  4. FREQUÊNCIA DE OCORRÊNCIA E CARACTERÍSTICAS MORFOLÓGICAS EXTERNOS DE PEIXES MARINHOS DE CAIÇARA DO NORTE, RIO GRANDE DO NORTE, BRASIL

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    Marcelo Moreira Carvalho

    2014-08-01

    Full Text Available O litoral de Caiçara do Norte é considerado uma área de maior produção pesqueira artesanal do Rio Grande do Norte, Brasil. O objetivo deste estudo foi verificar a frequência de ocorrência, as características morfológicos externos de peixes marinhos de Caiçara do Norte, RN. Durante o período de julho de 2012 a agosto de 2013, foi registrada a ocorrência de cinco ordens (Beloniformes, Clupeiformes, Mugiliformes, Perciformes, Siluriformes, 13 famílias (Ariidae, Exocoetidae, Carangidae, Clupeidae, Coryphaenidae, Haemulidae, Hemiramphidae, Istiophoridae, Lutjanidae, Mugilidae, Sparidae, Serranidae,  Scombridae e 29 espécies de peixes marinhos. Os resultados do presente trabalho podem enriquecer o conhecimento da ictiofauna das águas costeiras de Caiçara do Norte, além de fornecer informações para o futuro planejamento da gestão e conservação dos recursos pesqueiros do litoral do Rio Grande do Norte, Brasil. Palavras chave: Águas costeiras; pesca artesanal; recursos pesqueiros; litoral norte do RN. DOI: http://dx.doi.org/10.18561/2179-5746/biotaamazonia.v4n2p55-63

  5. Comparative histology in the liver and spleen of three species of freshwater teleost

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    Camila F. Sales

    2017-03-01

    Full Text Available ABSTRACT We describe and compare the histology of liver and spleen ofGeophagus brasiliensis (Perciformes, Hypostomus francisci (Siluriformes and Hoplias aff. malabaricus (Characiformes, tropical freshwater fishes. InG. brasiliensisandH. aff. malabaricusthe hepatocytes were arranged in tubular form whereas in H. franciscithey cord-like. In all species, hepatocytes presented glycogen, but in G. brasiliensis and H. aff. malabaricus they showed strong stained for hemossiderin in the cytoplasm. InG. brasiliensis and H. aff. malabaricus, melanomacrophage centres (MMCs were associated to hepatic structures and only in G. brasiliensis was observed intrahepatic exocrine pancreas. The spleen, in all species, was characterized by red and white pulp without boundary between the two regions, but only in H. francisci was recorded nodular organization in splenic parenchyma. The G. brasiliensisandH. aff. malabaricuspresented in the white pulp MMCs linked mainly to ellipsoids. Besides, we observed large MMCs in the spleen in relation to liver of G. brasiliensis and H. aff. malabaricus. In liver, highest values of reticular fibers and collagen were observed inG. brasiliensis. In spleen, highest values of reticular fibers and collagen were recorded inH. aff. malabaricusandH. francisci, respectively. Histological differences confirm the hypothesis that the phylogenetic distance is reflected in liver and spleen.

  6. Seasonal variation and community structure of fishes in the Mahananda River with special reference to conservation issues

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    Shams Muhammad Galib

    2016-04-01

    Full Text Available This study was carried out in the Mahananda River from January to December 2013 with a view to determining the seasonal variation and community structure of fishes along with some conservation issues. Monthly sampling was carried out using traditional fishing gears and fishes were identified based on morphometric and meristic characters. A total of 4082 individuals of native fish species were captured, analyzed and classified into 62 species belonging to 46 genera, 25 families and 9 orders. Cypriniformes and Siluriformes were the dominant fish orders represented by 19 species each and the most abundant family was Cyprinidae (14 species. In addition to indigenous individuals, 9 individuals of 2 exotic fish species (Hypophthalmichthys molitrix and Pangasius hypophthalmus were also recorded. Among three sampling sites, S-1 was the most diversified in terms of not only the number of individual fish but also the number of species present represented by mean (±SE individuals of 151.50±25.22 and species of 25.58±3.91. Three distinct fish groups of fish families were revealed from the cluster analysis of similarity. To improve the situation, control of illegal fishing gears, establishment of sanctuaries and legal protection for threatened species are recommended.

  7. [Species composition and geographical distribution of threatened fishes in Yunnan Province of Southwest China].

    Science.gov (United States)

    Zhang, Qian; Zhong, Jin-Xin

    2013-05-01

    Based on the related published papers, and by using Geographic Information System (ArcGIS 9.3), this paper analyzed the species composition and geographical distribution of threatened fishes in Yunnan Province of Southwest China. There were 83 threatened species living in the Province, belonging to 5 orders, 13 families, and 47 genera. Cypriniformes was absolutely dominant, with 64 species, followed by Siluriformes, with 16 species. Cyprinidae fishes had 51 species, accounting for 79.7% of Cypriniformes. The most species of Cyprinid fishes were of Barbinae (14 species), Cyprininae (10 species), and Cultrinae (10 species). The threatened fishes could be divided into two zoogeographical regions, i. e., Tibetan Plateau region and Oriental region, and their species composition and geographical distribution were resulted from the historical evolution adapted to the related environments. Whatever in rivers and in lakes, the Cyprinid fishes were both absolutely dominant, occupying 36.1% and 31.3% of the total, respectively. The Cyprinid fishes in rivers were mostly of endangered species, while those in lakes were mostly of vulnerable species. The factors affecting the threatened fishes in the Province were discussed from the two aspects of geodynamic evolution and present situation.

  8. Effect of abiotic variables on fish eggs and larvae distribution in headwaters of Cuiabá River, Mato Grosso State, Brazil

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    Simoni Ramalho Ziober

    Full Text Available Researches on ichthyoplankton seems to be an important tool to identification of spawning areas and periods for freshwater fish. Ichthyoplankton was sampled monthly in the headwaters of the Cuiabá River, upper Paraguay River basin, (Mato Grosso State, Brazil, and in four of its tributaries, between November 2007 and March 2008, to evaluate the spatial and temporal distribution of fish eggs and larvae and the influence of regional and local variables on their distribution. In total, 22,067 eggs and 1,045 larvae were collected. A significant negative correlation was found between egg density and the variables of river level and flow volume. Larval density was not significantly correlated with any of the regional variables. The egg and larval densities were significantly higher at the sampling sites in the main river. The highest densities were found in environments with greater river widths, intermediate depths and lowest values of dissolved oxygen, electrical conductivity, and transparency. Anostomidae, Zungaro zungaro, Bryconamericus spp., Pimelodus spp., Pimelodidae, Auchenipteridae, and Siluriformes were the most abundant groups of larvae, and were observed at the sampling sites in the main river. The study site is an important spawning area for migratory and, non-migratory fish species, and highlight the importance of the main river to the reproductive event, by the influence of local variables transparency and river width, which in turn maybe temporally influenced by the river level.

  9. Temporal variability of fish larvae assemblages: influence of natural and anthropogenic disturbances

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    David A. Reynalte-Tataje

    Full Text Available Natural and induced disturbances greatly influence the temporal distribution of ichthyoplankton abundance. This study assesses and compares the temporal variability of fish larvae assemblages in controlled and free environments to determine the influence of environment variables on the main taxa in these systems. The study was conducted at the Chapecó (without dam impact and Ligeiro (with dam impact river mouths, which are located in the upper Uruguay River. Samples were made between October 2001 and March 2004 during three reproductive periods. The larvae assemblages were composed of small and medium-sized Characiformes and Siluriformes. The variation in the distribution of larvae was mainly temporal (>85%. When the three reproductive periods were compared, it was observed in the second period, characterized by a larger water flow and a lower temperature, that there was a reduction in abundance, a lower number of taxa, an absence of stages in post-flexion and a high dissimilarity in larvae assemblage structure. In general, the environmental variables of water flow and temperature most influenced the distribution of egg and larvae abundance. In the studied area, a smaller temporal variability was observed in the structure of larvae assemblages at the sampling sites in the Chapecó River mouth than in in the Ligeiro River mouth under the influence of dams.

  10. African catfish (Clarias gariepinus Burchell, 1822. Thematic bibliography

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    I. Hrytsyniak

    2017-12-01

    Full Text Available Purpose. Forming a thematic bibliographic list of publications on certain issues of African catfish (Clarias gariepinus biology and cultivation in Ukraine and abroad, as well as concerning the effects of rearing conditions on physiological, biochemical and fish-breeding characteristics of clariids. Methods. The complete and selective methods were applied in the process of the systematic search. The bibliographic core have been formed with the publications in Ukrainian, Russian and English from the fund of scientific library of the Institute of Fisheries NAAS of Ukraine. Results. There was composed the thematic list of publications with a total quantity of 112 sources covering the time interval from 1978 to 2017, as well as an article from the "Aquaculture" journal, dated 2018, and including the fish-biological characteristics of African catfish as representative of Siluriformes order, Clariidae family. The literary sources are arranged in alphabetical order by author or title, and described according to DSTU 8302:2015 “ Information and documentation. Bibliographic reference. General principles and rules of composition”, with the amendments (code UKND 01.140.40, as well as in accordance with the requirements of APA style — international standard of references. Practical value. The list may be useful for scientists, practitioners, students, whose area of interests covers the questions of cultivation and study of the biological features of African catfish.

  11. TECNOLOGÍA Y SUBSISTENCIA EN EL SITIO ARQUEOLÓGICO CERRO TAPERA VÁZQUEZ (PARQUE NACIONAL PRE-DELTA, REPÚBLICA ARGENTINA

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    Mariano Bonomo

    2014-10-01

    Full Text Available In this paper the results of the studies carried out on ceramic and bone materials recorded at Cerro Tapera Vázquez site (Argentinean Northeast are presented. Taxonomic, anatomic and taphonomic studies of bone assemblages and technological-decorative analysis and refitting of pottery were undertaken. The site is located on a mound next to El Ceibo Creek, where 16 m2 were excavated in 2008. Abundant smooth, incised and modeled pottery (handles and zoomorphic appendages and numerous bones remains of Myocastor coypus (most frequent taxon, Blastocerus dichotomus, Ozotoceros bezoarticus, Cavia aperea, Leopardus geoffroyi, Lycalopex gymnocercus, Hydrochaeris hydrochaeris, birds and fish (Siluriformes and Characiformes were recorded. Except Cavia aperea rodent and Dusicyon gimnocercus fox, all taxa show evidence of anthropic modification (cut marks, fresh fractures and burning. Two radiocarbon dates were obtained: 650 and 520 yrs. BP. The results reached in this study lead to the conclusion that the pre-Hispanic populations that occupied Cerro Tapera Vázquez by the end of the Late Holocene were riverine canoe peoples, with complex ceramic technology and subsistence based on hunting of coypu, capybara and cervids, fishing and small-scale horticulture.

  12. Isolation of the pituitary gonadotrophic α-subunit hormone of the giant amazonian fish: pirarucu (Arapaima gigas).

    Science.gov (United States)

    Faria, M T; Carvalho, R F; Sevilhano, T C A; Oliveira, N A J; Silva, C F P; Oliveira, J E; Soares, C R J; Garcez, R; Santo, P R E; Bartolini, P

    2013-06-01

    The cDNAs of the α-subunit of the pituitary gonadotrophic hormones (GTHα) of fish of the order Osteoglossiformes or the superorder Osteoglossomorpha have never been sequenced. For a better understanding the phylogenetic diversity and evolution of PGHα in fish and for future biotechnological synthesis of the gonadotrophic hormones (ag-FSH and ag-LH), of Arapaima gigas, one of the largest freshwater fishes of the world, its GTHα cDNA was synthesized by reverse transcriptase and the polymerase chain reaction starting from total pituitary RNA. The ag-GTHα-subunit was found to be encoded by 348 bp, corresponding to a protein of 115 amino acids, with a putative signal peptide of 24 amino acids and a mature peptide of 91 amino acids. Ten cysteine residues, responsible for forming 5 disulfide linkages, 2 putative N-linked glycosylation sites and 3 proline residues, were found to be conserved on the basis of the known sequences of vertebrate gonadotrophic hormones. Phylogenetic analysis, based on the amino acid sequences of 38 GTHα-subunits, revealed the highest identity of A. gigas with members of the Acipenseriformes, Anguilliformes, Siluriformes and Cypriniformes (87.1-89.5 %) and the lowest with Gadiformes and Cyprinodontiformes (55.0 %). The obtained phylogenetic tree agrees with previous analysis of teleostei, since A. gigas, of the order of Osteoglossiformes, appears as the sister group of Clupeocephala, while Elopomorpha forms the most basal group of all other teleosts.

  13. OCORRÊNCIA E CARACTERIZAÇÃO DE PEIXES MARINHOS DA PRAIA DE PONTA NEGRA, RIO GRANDE DO NORTE, BRASIL

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    Thiago Augusto Bezerra Gurgel

    2014-10-01

    Full Text Available A praia de Ponta Negra, localizada no município de Natal, Rio Grande do Norte, abriga uma grande diversidade de peixes de importância econômica e ecológica. Esta ictiofauna local vem sofrendo com a destruição de seus ecossistemas devido às atividades antrópicas, em especial a alta especulação imobiliária, ao despejo de esgoto e a pesca predatória. O presente trabalho verificou a ocorrência e as características morfológicas externos de peixes marinhos das águas costeiras da praia de Ponta Negra, Natal, Rio Grande do Norte. Durante o período de janeiro a dezembro de 2012, foi registrada a ocorrência de dez espécies de peixes, distribuídos em três ordens (Carcharhiniformes, Siluriformes e Perciformes, oito famílias (Carcharhinidae, Ariidae, Centropomidae, Carangidae, Sciaenidae, Ephippidae, Scombridae, Trichiuridae. Os resultados do presente trabalho agregam ao estudo realizado anteriormente, quando 20 outras espécies de peixes marinhos foram registradas, e podem enriquecer o conhecimento da ictiofauna de águas costeiras de Natal, Rio Grande do Norte. Palavras-chave: região costeira, ictiofauna, taxonomia, pesca artesanal, recursos pesqueiros. DOI: http://dx.doi.org/10.18561/2179-5746/biotaamazonia.v4n3p112-118

  14. Genetic structure in the Amazonian catfish Brachyplatystoma rousseauxii: influence of life history strategies.

    Science.gov (United States)

    Carvajal-Vallejos, F M; Duponchelle, F; Desmarais, E; Cerqueira, F; Querouil, S; Nuñez, J; García, C; Renno, J-F

    2014-08-01

    The Dorado or Plateado (Gilded catfish) Brachyplatystoma rousseauxii (Pimelodidae, Siluriformes) is a commercially valuable migratory catfish performing the largest migration in freshwaters: from the Amazonian headwaters in the Andean foothills (breeding area) to the Amazon estuary (nursery area). In spite of its importance to inform management and conservation efforts, the genetic variability of this species has only recently begun to be studied. The aim of the present work was to determine the population genetic structure of B. rousseauxii in two regions: the Upper Madera Basin (five locations in the Bolivian Amazon) and the Western Amazon Basin (one regional sample from the Uyucalí-Napo-Marañon-Amazon basin, Peru). Length polymorphism at nine microsatellite loci (284 individuals) was used to determine genetic variability and to identify the most probable panmictic units (using a Bayesian approach), after a significant departure from Hardy-Weinberg equilibrium was observed in the overall dataset (Western Amazon + Upper Madera). Bayesian analyses revealed at least three clusters in admixture in the five locations sampled in the Bolivian Amazon, whereas only two of these clusters were observed in the Western Amazon. Considering the migratory behaviour of B. rousseauxii, different life history strategies, including homing, are proposed to explain the cluster distribution. Our results are discussed in the light of the numerous threats to the species survival in the Madera basin, in particular dam and reservoir construction.

  15. Diversidad y el estado de conservación de cuerpos de agua Amazónicos en el nororiente del Perú

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    Hernán Ortega

    2013-05-01

    Full Text Available En el presente trabajo se describen la diversidad y estado de conservación, determinados por un inventario biológico rápido, entre el 24 y 30 de octubre de 2005, en cuerpos de agua del nororiente del Perú, ubicados, entre los 133 y 680 m de altitud, entre Tarapoto (San Martín y Yurimaguas (Loreto. Se colectaron datos y muestras en 26 estaciones. Los peces fueron colectados con redes de arrastre a la orilla, el bentos con red "Surber", y el plancton con red estándar (40 micras. En cada estación, se anotaron coordenadas (UTM y se describieron hábitats limnologicamente (pH, temperatura, conductividad, oxigeno disuelto. La riqueza de especies en peces fue de 95, predominan Characiformes y Siluriformes. La riqueza de especies de peces en fitoplancton fue de 74, en zooplancton, 22 especies y en bentos de 20 especies. Para determinar el estado de conservación se uso el Índice de Integridad Biológica (IBI para peces y EPT (Ephemeroptera, Plecoptera, y Trichoptera para la integridad de los ambientes acuáticos. Los resultados indican que en las zonas mejor conservadas se encuentran en los alrededores de Yurimaguas.

  16. Epididymal sperm from Spix's yellow-toothed cavies sperm successfully cryopreserved in Tris extender with 6% glycerol and 20% egg yolk.

    Science.gov (United States)

    Silva, Andréia M; Praxedes, Erica C G; Campos, Lívia B; Bezerra, Luana G P; Moreira, Samara S J; Maia, Keilla M; Souza, Ana L P; Silva, Alexandre R

    2018-04-01

    As a non-threatened hystricognath rodent species, Spix's yellow-toothed cavies can be used as a model for the development of assisted reproductive techniques for the conservation of closely related species. The objective was to establish a functional protocol for cryopreservation of epididymal sperm from these cavies. Twelve sexually mature males, ∼2 y old and weighing ∼300 g, were euthanized. Sperm were recovered by retrograde flushing of the vas deferens and cauda epididymis with Tris extender. Thereafter, sperm were extended in Tris plus 20% egg yolk, with 3%, 6% or 9% glycerol or dimethyl sulfoxide (DMSO), placed in 0.25 mL straws and cryopreserved in liquid nitrogen. Sperm concentration, motility (using computer-assisted sperm analysis; CASA), plasma membrane integrity, osmotic response, morphology and sperm binding-ability were determined in fresh and frozen-thawed sperm. For most sperm endpoints, glycerol was a more desirable cryoprotectant than DMSO. Data (mean ± SEM) were similar with use of 3%, 6%, and 9% glycerol (P > 0.05) in osmotic response (40.66 ± 6.3%, 42.5 ± 7.1%, and 39.5 ± 5.0% respectably), and membrane integrity (55.17 ± 5.5%, 68.4 ± 4.1%, and 59.1 ± 4.9% respectably). Among concentrations assessed, the use of 6% glycerol resulted in the greatest (P < 0.05) post-thaw values for total motility (60.9 ± 4.4%), rapid subpopulation motility (27.7 ± 3.1%) and sperm-binding capability (227.0 ± 20.2). In conclusion, epididymal sperm from the Spix's yellow-toothed cavies (G. spixii) are optimally cryopreserved in Tris extender with 6% glycerol and 20% egg yolk. Copyright © 2018 Elsevier B.V. All rights reserved.

  17. Karyotypic diversity in four species of the genus Gymnotus Linnaeus, 1758 (Teleostei, Gymnotiformes, Gymnotidae): physical mapping of ribosomal genes and telomeric sequences

    Science.gov (United States)

    Scacchetti, Priscilla Cardim; Pansonato-Alves, José Carlos; Utsunomia, Ricardo; Oliveira, Claudio; Foresti, Fausto

    2011-01-01

    Abstract Conventional (Giemsa, C-Banding, Ag-NORs, CMA3) and molecular (5S rDNA, 18S rDNA, telomeric sequences) cytogenetic studies were carried out in specimens of ten distinct fish populations of the genus Gymnotus (Gymnotus sylvius Albert and Fernandes-Matioli, 1999, Gymnotus inaequilabiatus Valenciennes, 1839, Gymnotus pantherinus Steindachner, 1908, and G. cf. carapo Linnaeus, 1758) from different Brazilian hydrographic basins. Gymnotus sylvius presented a diploid number of 40 chromosomes (22m+12sm+6st), Gymnotus pantherinus presented 52 chromosomes (32m+18sm+2st), while Gymnotus inaequilabiatus (42m+10sm+2a)and Gymnotus cf. carapo (38m+12sm+4st) presented 54 chromosomes. The C-banding technique revealed centromeric marks in all chromosomes of all species. Besides that, conspicuous blocks of heterochromatin were found interstitially on the chromosomes of Gymnotus inaequilabiatus, Gymnotus cf. carapo,and Gymnotus pantherinus. All four species showed single nucleolus organizing regions confirmed by results obtained through Ag-NORs and FISH experiments using 18S rDNA probes, which showed the NORs localized on the first chromosome pair in Gymnotus inaequilabiatus, Gymnotus cf. carapo,and Gymnotus pantherinus, and on pair 2 in Gymnotus sylvius. CMA3 staining revealed additional unrelated NORs marks in Gymnotus sylvius and Gymnotus pantherinus. The 5S rDNA probes revealed signals on one pair in Gymnotus sylvius and two pairs in Gymnotus pantherinus; Gymnotus inaequilabiatus had about seventeen pairs marked, and Gymnotus cf. carapo had about fifteen pairs marked. It is considered that the high amount of heterochromatin identified in the chromosomes of Gymnotus inaequilabiatus and Gymnotus cf. carapo could have facilitated the dispersion of 5S rDNA in these species. Interstitial signals were detected on the first metacentric pair of Gymnotus sylvius by telomeric probes (TTAGGG)n indicating the possible occurrence of chromosomal fusions in this species. The present

  18. Effects of dam operation on the endangered Júcar nase, Parachondrostoma arrigonis, related to mesohabitats, microhabitat availability and water temperature regime, in the river Cabriel (Spain)

    Science.gov (United States)

    Martinez-Capel, Francisco; Costa, Rui; Muñoz-Mas, Rafael; Diego Alcaraz-Hernandez, Juan; Hernandez-Mascarell, Aina

    2010-05-01

    The presence of large dams affects habitat availability, often regarded as the primary factor that limits population and community recovery in rivers. Physical habitat is often targeted in restoration, but there is often a paucity of useful information. Habitat degradation has reduced the complexity and connectivity of the Mediterranean streams in Spain. These changes have diminished the historical range of the endangered Júcar nase, Parachondrostoma arrigonis (Steindachner, 1866), isolated the populations of this species, and probably contributed to its risk of extinction. In the Júcar River basin (Spain), where this fish is endemic, the populations are mainly restricted to the river Cabriel, which is fragmented in two segments by the large dam of Contreras. In this river, 3 main lines of research were developed from 2006 to 2008, i.e., microhabitat suitability, mesohabitat suitability, and water temperature, in order to relate such kind of variables with the flow regime. The main goal of the research project, funded by the Spanish Ministry of Environment, was to detect the main reasons of the species decline, and to propose dam operation improvements to contribute to the recovery of the species. The flow and water temperature regimes were also studied in the river Cabriel, upstream and downstream the large dam of Contreras. During the three years of study, below the dam it was observed a small and not significant variation in the proportions of slow and fast habitats; the regulated flow regime was pointed out as the main reason of such variations. At the microhabitat scale, optimal ranges for average depth and velocity were defined; these data allowed us to develop an estimation of weighted useable area under natural and regulated conditions. The Júcar nase were found majorly at depths no greater than 1,15 meters with slow water velocities. It was possible to observe a clear alteration of the flow and water temperature regime below the dam, due to the cold

  19. A study of the life history of brazilian sardine, Sardinella brasiliensis.: III. development of sardine larvae

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    Yasunobu Matsuura

    1975-01-01

    Full Text Available Larvae and juveniles of S. brasiliensis (Steindachner, 1879, ranging from 6.4 mm to 35.5 mm, were identified from plankton samples taken in waters off the southern Brazilian coast from 1969 through 1971. Changes in the pattern of pigmentation, body proportions and formation of fin rays are described. During transformation stage a considerable advancement of the dorsal and anal fins was observed. Changes in body proportions are pronounced at the size of 19 mm. Complete ossification of all fin rays is attained at the size of 20 mm, but ossification of the ventral scutes is delayed and completed only at the size of 30 mm. Ossification of the vertebral column was completed at the size of about 16 mm.O presente trabalho é parte do projeto SOL e tem por objetivo descrever a morfologia das larvas da sardinha verdadeira, Sardinella brasiliensis (=S. aurita, com o intuito de determinar um padrão que possibilite a identificação das mesmas. São feitas considerações sobre a morfologia das larvas de outros clupeídeos existentes na região e ressaltadas as diferenças com relação as larvas de S. brasiliensis. Os resultados, posteriormente, serão usados como base para o estudo quantitativo da abundância de larvas de sardinha. O material foi coletado na costa sul do Brasil de 1969 a 1971, com uma rede de plâncton do tipo cônico-cilíndrico. Durante o desenvolvimento das larvas, foi observado um considerável deslocamento das bases das nadadeiras dorsal e anal, para uma posição mais anterior. Com o tamanho de 19 mm (comprimento padrão, ocorre uma mudança geral, considerável, nas proporções corporais. A ossificação de todos os raios das nadadeiras completa-se quando a larva atinge 20 mm, mas a ossificação dos escudos ventrais só se completa quando ela atinge 30 mm de comprimento. A ossificação das vertebras completa-se a 16 mm de comprimento. O tamanho de 19 mm foi considerado como o fim do estagio larval, e, apos este comprimento

  20. Karyotypic diversity in four species of the genus Gymnotus Linnaeus, 1758 (Teleostei, Gymnotiformes, Gymnotidae: physical mapping of ribosomal genes and telomeric sequences

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    Priscilla Scacchetti

    2011-08-01

    Full Text Available Conventional (Giemsa, C-Banding, Ag-NORs, CMA3 and molecular (5S rDNA, 18S rDNA, telomeric sequences cytogenetic studies were carried out in specimens of ten distinct fish populations of the genus Gymnotus (G. sylvius Albert and Fernandes-Matioli, 1999, G. inaequilabiatus Valenciennes, 1839, G. pantherinus Steindachner, 1908, and G. cf. carapo Linnaeus, 1758 from different Brazilian hydrographic basins. G. sylvius presented a diploid number of 40 chromosomes (22m+12sm+6st, G. pantherinus presented 52 chromosomes (32m+18sm+2st, while G. inaequilabiatus (42m+10sm+2a and G. cf. carapo (38m+12sm+4st presented 54 chromosomes. The C-banding technique revealed centromeric marks in all chromosomes of all species. Besides that, conspicuous blocks of heterochromatin were found interstitially on the chromosomes of G. inaequilabiatus, G. cf. carapo, and G. pantherinus. All four species showed single nucleolus organizing regions confirmed by results obtained through Ag-NORs and FISH experiments using 18S rDNA probes, which showed the NORs localized on the first chromosome pair in G. inaequilabiatus, G. cf. carapo, and G. pantherinus, and on pair 2 in G. sylvius. CMA3 staining revealed additional unrelated NORs marks in G. sylvius and G. pantherinus. The 5S rDNA probes revealed signals on one pair in G. sylvius and two pairs in G. pantherinus; G. inaequilabiatus had about seventeen pairs marked, and G. cf. carapo had about fifteen pairs marked. It is considered that the high amount of heterochromatin identified in the chromosomes of G. inaequilabiatus and G. cf. carapo could have facilitated the dispersion of 5S rDNA in these species. Interstitial signals were detected on the first metacentric pair of G. sylvius by telomeric probes (TTAGGGn indicating the possible occurrence of chromosomal fusions in this species. The present study reveals valuable cytotaxonomic markers for this group and allows a more precise evaluation of the processes involved in the

  1. Functional trophic composition of the ichthyofauna of forest streams in eastern Brazilian Amazon

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    Gabriel Lourenço Brejão

    Full Text Available This study aimed to describe the functional organization of the ichthyofauna of forest streams from northeastern Pará State, Brazil, based on behavioral observation of species' feeding tactics. Seven streams were sampled between June and November, 2010, during snorkeling sessions, totaling 91h 51min of visual censuses at day, dusk, and night periods. Seventy three species distributed in six orders, 26 families and 63 genera were observed, with dominance of Characiformes, followed by Siluriformes. From information gathered by ad libitum observations, each species was included in one of 18 functional trophic groups (FTGs, according to two main characteristics: (1 its most frequently observed feeding tactic; and (2 its spatial distribution in the stream environment, considering their horizontal (margins or main channel and vertical (water column dimensions. The most frequent FTGs observed were Nocturnal invertebrate pickers (9 species, Diurnal channel drift feeders (8 spp., Diurnal surface pickers (7 spp., and Ambush and stalking predators (6 spp.. The FTGs herein defined enable a comparative analysis of the structure and composition of ichthyofauna in different basins and environmental conditions, which presents an alternative approach to the use of taxonomic structure in ecological studies. The ichthyofauna classification based in FTGs proposed in this study is compared to three other classifications, proposed by Sazima (1986, Sabino & Zuanon (1998 and Casatti et al. (2001.Este estudo teve como objetivo descrever a organização funcional da fauna de peixes de riachos do nordeste do estado do Pará, Brasil, com base em observações comportamentais das táticas alimentares das espécies. Sete igarapés foram amostrados entre junho e novembro de 2010 por técnicas de observações diretas durante sessões de mergulho livre, totalizando 91h 51min de observação, nos períodos diurno, crepuscular vespertino e noturno. Foram observadas 73 esp

  2. Avaliação hematológica de espécies de peixe de valor comercial da planície de inundação do rio Paraná, Brasil Hematological evaluation in commercial fish species from the floodplain of the upper Paraná River, Brazil

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    Augusto Cocuzza das Eiras

    2000-05-01

    Full Text Available Em fevereiro de 1994 e março de 1995, foram analisados 144 exemplares pertencentes a 20 espécies mais representativas da bacia do rio Paraná, Estado do Paraná e Mato Grosso do Sul, Brasil. Retirou-se sangue para as determinações de: número de eritrócitos; hematócrito; taxa de hemoglobina; contagem diferencial dos leucócitos e cálculo dos índices hematimétricos absolutos: volume corpuscular médio, hemoglobina corpuscular média e concentração de hemoglobina corpuscular média. Para P. lineatus e S. borellii foi possível fazer uma análise mais detalhada, considerando-se os sexos e os estádios de maturação gonadal. Para estas espécies, encontraram-se diferenças significativas entre os estádios de maturação gonadal, com valores mais baixos no estádio de repouso. Na contagem diferencial dos leucócitos, foram encontrados os seguintes leucócitos: linfócitos, monócitos, neutrófilos, basófilos, eosinófilos, célula granulocítica especial e algumas células de aspecto imaturo. De maneira geral, para a maioria das espécies, o neutrófilo é a célula mais freqüente, seguida pelo linfócito. Os eosinófilos estiveram presentes em maior porcentagem no sangue periférico de alguns Siluriformes.In February 1994 and in March 1995 one hundred and forty-four four specimens of teleosts were analyzed. They belonged to the 20 most representative species from the Paraná River basin, state of Paraná and Mato Grosso do Sul, Brazil. Blood samples were collected from caudal peduncle to determine the number of erythrocytes (Er, hematocrit (Ht, hemoglobin rate (Hb and differential percentage of leukocytes. Total hematometric indexes (mean corpuscle volume, mean corpuscle hemoglobin and mean corpuscular hemoglobin concentration were estimated. Hematological parameters related to sex and gonadal maturation stages were undertaken for Prochilodus lineatus and Schizodon borellii. In these species significant differences between the gonadal

  3. Fish community structure of Juramento reservoir, São Francisco River basin, Minas Gerais, Brazil Estrutura da comunidade de peixes do reservatório de Juramento, bacia do Rio São Francisco, Minas Gerais, Brasil

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    André R. M. Silva

    2006-09-01

    Full Text Available Many rivers in Brazil as the São Francisco (SFR have been impounded for reservoirs construction purposes. However, there is a lack of knowledge on their fish fauna in many areas, including headwaters. The present study aimed to describe the fish community structure from Juramento reservoir, located on Juramento River, a branch of SFR basin. Six bimonthly samplings were made in four different sites. Gill and cast nets, beach seines and sieves were used to collect fish. Ecological indexes as well as the relationship between fish abundance and some limnological variables were determined. 3288 fish belonging to 33 species (16.5% of the total described for SFR basin were captured, being 75.7% Characiformes, 18.1% Siluriformes, 3% Cyprinodontiformes and 3% Gymnotiformes. Only two non-native species, 'tamboatá' - Hoplosternum littorale (Hancock, 1828 and 'trairão' - Hoplias lacerdae Ribeiro, 1908 were found. The highest catches in number occurred in the dry period (March-October and the lowest one in the wet season (November-February. Diversity was higher at Barragem station and richness did not vary between reservoir zones. Five migratory species were found downstream of the dam (four exclusively there, whereas only the 'curimbatá-pioa' - Prochilodus costatus Valenciennes, 1850 occurred in the reservoir. The low observed correlations between fish abundance and the limnological variables utilized suggest that the local fish fauna is not strongly affected by their variation.No Brasil, vários rios, como os da bacia do São Francisco (RSF, são barrados para a formação de reservatórios. Entretanto, o estudo desta ictiofauna, especialmente a dos rios de cabeceira, ainda deixa a desejar. O presente estudo descreveu a estrutura da ictiofauna do reservatório de Juramento, Rio Juramento, bacia do RSF. Foram realizadas seis coletas bimestrais em quatro locais empregando-se redes de emalhar, tarrafas, arrastões e peneiras. Foram determinados

  4. Composição da fauna cavernícola brasileira, com uma análise preliminar da distribuição dos taxons

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    Eleonora Trajano

    1990-01-01

    Full Text Available New data on Brazilian cave fauna are added to previous surveys and the relative abundance and distribution of the cavernicolous taxa is discussed. Terrestrial representatives of several arthropod families and genera are common in both tropical and subtropical Brazilian caves: Endecous and Eidmanacris crickets, Reduviidae heteropterans, Carabidae, Catopinae and Ptilodactylidae beetles, dipterans such as the Chironomidae, Keroplatidae, Phoridae and Drosophilidae, Hydropsychidae trichopterans, Pseudonnanolenidae and Chelodesnidae millipedes, Plato, Ctenus, Loxosceles and Blechroscelis spiders, Pachylinae opilionids, Chernetidae pseudoscorpions and acarians such as the Macrochelidae and Uropodidae. Other taxa are mainly or exclusively tropical Blattelidae, Blattidae and BlaberidaE cockroaches, Histeridae beetles, Noctuoidea moths, social insects as termites and ants, Styloniscidae isopods, Migalomorpha spiders, Amblypigi On the other hand, Psauridae spiders, Goniosoma and Tricommatinae opilionids, Elmidae beetles, and Philosciidae isopods seems to be mainly subtropical. Brazilian aquatic cave fauna seems to be less diversified than the terrestrial one. Siluriform fishes such as pimelodids, trichomycterids and loricariids predominate throughout the country, besides decapod (Macrobrachium shrimps, Potamidae crabs, Aegla anomurans, the latter exclusive of subtropical caves and amphipod (Spelaeogammarus, in tropical caves, and Hyalella crustaceans. Insect larvae (e.g. Elmidae coleopterans, Nematocera dipterans, trichopterans and adults (e.g. Veliidae and Naucoridae heteropterans, Dytiscidae coleopterans, oligochaetes and gastropods such as the Hydrobiidae, are also relatively common. Blechroscelis spiders, Goniosoma opilionids, Zelurus heteropterans, Eidmanacris crickets, Keroplatidae dipterans and Macrobrachium shrimps, among others, live next to the entrance zone in the majority of the caves. But, these animals become troglofiles under certain

  5. Homology of the Fifth Epibranchial and Accessory Elements of the Ceratobranchials among Gnathostomes: Insights from the Development of Ostariophysans

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    Carvalho, Murilo; Bockmann, Flávio Alicino; de Carvalho, Marcelo Rodrigues

    2013-01-01

    Epibranchials are among the main dorsal elements of the gill basket in jawed vertebrates (Gnathostomata). Among extant fishes, chondrichthyans most resemble the putative ancestral condition as all branchial arches possess every serially homologous piece. In osteichthyans, a primitive rod-like epibranchial 5, articulated to ceratobranchial 5, is absent. Instead, epibranchial 5 of many actinopterygians is here identified as an accessory element attached to ceratobranchial 4. Differences in shape and attachment of epibranchial 5 in chondrichthyans and actinopterygians raised suspicions about their homology, prompting us to conduct a detailed study of the morphology and development of the branchial basket of three ostariophysans (Prochilodus argenteus, Characiformes; Lophiosilurus alexandri and Pseudoplatystoma corruscans, Siluriformes). Results were interpreted within a phylogenetic context of major gnathostome lineages. Developmental series strongly suggest that the so-called epibranchial 5 of actinopterygians does not belong to the epal series because it shares the same chondroblastic layer with ceratobranchial 4 and its ontogenetic emergence is considerably late. This neomorphic structure is called accessory element of ceratobranchial 4. Its distribution among gnathostomes indicates it is a teleost synapomorphy, occurring homoplastically in Polypteriformes, whereas the loss of the true epibranchial 5 is an osteichthyan synapomorphy. The origin of the accessory element of ceratobranchial 4 appears to have occurred twice in osteichthyans, but it may have a single origin; in this case, the accessory element of ceratobranchial 4 would represent a remnant of a series of elements distally attached to ceratobranchials 1–4, a condition totally or partially retained in basal actinopterygians. Situations wherein a structure is lost while a similar neomorphic element is present may lead to erroneous homology assessments; these can be avoided by detailed morphological and

  6. Seasonal changes in the gonadossomatic index, allometric condition factor and sex ratio of an auchenipterid catfish from eastern Amazonia

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    Tiago Magalhães da Silva Freitas

    Full Text Available The aim of the present study was to evaluate the seasonal pattern of the gonadosomatic index (GSI, condition factor (K, and sex ratio in the catfish Auchenipterichthys longimanus (Siluriformes: Auchenipteridae as an approach to identify its reproductive period. A total of 589 A. longimanus specimens (251 males and 338 females were captured in the rivers of the Caxiuanã National Forest, in the Brazilian state of Pará, between July, 2008 and July, 2009. Among the male specimens, 171 were classified as adults and 80 as juveniles, while there were 249 adults and 89 juvenile females. Using a sinusoidal equation, analysis of the GSI revealed a reproductive asynchrony between the genders, with males attaining their highest GSI values in January, while females peaked in March. For males, the sinusoidal regression for GSI values was significant only when used the complete data set (P=0.001, wears no trend was identified for bimonthly means (P=0.136. For females, by contrast, significant values were obtained for both the complete data set (P=0.012 and bimonthly GSI means (P=0.026. For the condition factor, the sinusoidal equation returned significant seasonal variation in both raw data (P=0.02 and with mean values (P=0.00 for males, but only with raw data for females (P=0.04, which appears to reflect variation in the energy budget between genders. With regard to the sex ratio, more reproductive females were captured than males in January and March, 2009, which suggests a pattern of segregation related to the reproductive process. These parameters are fundamental to the assessment, protection, and management of natural fish stocks, as well as providing guidelines for the development of conservation strategies.

  7. Testing for the Occurrence of Selective Episodes During the Divergence of Otophysan Fishes: Insights from Mitogenomics.

    Science.gov (United States)

    D'Anatro, Alejandro; Giorello, Facundo; Feijoo, Matías; Lessa, Enrique P

    2017-04-01

    How natural selection shapes biodiversity constitutes a topic of renewed interest during the last few decades. The division Otophysi comprises approximately two-thirds of freshwater fish diversity and probably underwent an extensive adaptive radiation derived from a single invasion of the supercontinent Pangaea, giving place to the evolution of the main five Otophysan lineages during a short period of time. Little is known about the factors involved in the processes that lead to lineage diversification among this group of fishes and identifying directional selection acting over protein-coding genes could offer clues about the processes acting on species diversification. The main objective of this study was to explore the otophysan mitochondrial genome evolution, in order to account for the possible signatures of selective events in this lineage, and to explore for the functional connotations of these molecular substitutions. Mainly, three different approaches were used: the "ω-based" BS-REL and MEME methods, implemented in the DATAMONKEY web server, and analysis of selection on amino acid properties, implemented in the software TreeSAAP. We found evidence of selective episodes along several branches of the evolutionary history of othophysan fishes. Analyses carried out using the BS-REL algorithm suggest episodic diversifying selection at basal branches of the otophysan lineage, which was also supported by analyses implemented in MEME and TreeSAAP. These results suggest that throughout the Siluriformes radiation, an important number of adaptive changes occurred in their mitochondrial genome. The metabolic consequences and ecological correlates of these molecular substitutions should be addressed in future studies.

  8. Impact assessment of the introduction of Cichla kelberi in a large Neotropical reservoir and its lateral lagoons (Upper Paraná River Basin, Brazil

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    M. Ferrareze

    Full Text Available Abstract This study aimed to understand how the introduction of Cichla kelberi in Rosana Reservoir (Paranapanema River affected the native ichthyofauna. Data on the structure of the small fish fauna assemblage were obtained before and after the introduction of this carnivorous species. Samplings were carried out in February and September of 2004, previously to the register of Cichla kelberi in the reservoir, and after its introduction, November of 2004, January, March, May and August of 2005, February and June of 2006, February and July of 2007, February and October of 2008 and February of 2009. A total of 4,693 fish, belonging to 43 different species was sampled between 2004 and 2009. The order Characiformes was the most abundant, followed by Perciformes and Siluriformes. Comparative analyses, before and after the introduction, could not demonstrate significant changes in composition, richness, abundance, biomass, mean length and diversity of fish. Aquatic insects were the main feeding item of C. kelberi, followed by tetragonopterinae fish. Cannibalism was recorded during the whole study period. The results showed that Cichla cannot deeply affect the ichthyofauna assemblages of a large Neotropical reservoir, at least in a short or medium term period after its introduction. The results also allowed concluding that the introduction of C. kelberi in the reservoir is in the phase 3. In this phase, the specie can survive and reproduce in the new environment; however it is not totally established and disseminated. The reasons for the fact that Cichla is still not dominant in Rosana Reservoir could be related to feeding competition, high rate of cannibalism and the presence of large amount of aquatic macrophytes (refuge zones. In spite of the results, the continuous monitoring of the role of non-native species on the local fish fauna is absolutely necessary because the impacts caused by colonization of this undesirable species can be magnified by

  9. Testing the ecomorphological hypothesis in a headwater riffles fish assemblage of the rio São Francisco, southeastern Brazil

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    Lilian Casatti

    Full Text Available The ecomorphology of 14 fish species resident in a headwater riffles area of the São Francisco river, southeastern Brasil, was analyzed and combined with diet and feeding behavior data, previously obtained by us. The three larger species groups formed in the ecomorphological analysis were found to reflect primarily microhabitat occupation in the following manner: a nektonic characids with compressed bodies, lateral eyes and lateral pectoral fins, with diurnal and opportunistic feeding habits (Astyanax rivularis, Bryconamericus stramineus, and Bryconamericus sp.; b nektobenthic characiforms and siluriforms with fusiform bodies and expanded pectoral fins, including sit-and-wait characidiins, predators of aquatic insect larvae (Characidium fasciatum and Ch.zebra, as well as the algae grazing parodontids (Apareiodon ibitiensis and Parodon hilarii, and also the heptapterid and trichomycterid catfishes that practice substrate speculation and feed on benthic aquatic insect larvae (Cetopsorhamdia iheringi, Imparfinis minutus, Rhamdia quelen, and Trichomycterus sp.; c benthic species with depressed bodies, suctorial oral discs, dorsal eyes, and horizontal pectoral fins, represented by the periphytivorous loricariid catfishes (Hisonotus sp., Harttia sp., and Hypostomus garmani. Correlation between diet and general morphology was not significant in our analysis, unless when the analyzed set included only nektonic and benthic species, indicating that the lack of correlation between these factors is most pronounced in the group of nektobenthic species. The unequivocal case of morphological convergence found between the nektobenthic Characidiinae and Parodontidae is a clear example of the integration between phylogenetic information and ecomorphology, and provides a way to objectively identify cases of morphological and adaptive convergence and divergence. Furthermore, the general congruence between the ecomorphological results and the independently obtained

  10. The Canal da Piracema at Itaipu Dam as a fish pass system

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    Sérgio Makrakis

    Full Text Available The Canal da Piracema is the longest (nearly 10 km fish pass system in the world. The construction of this fish pass was somehow controversial, because it connected two distinct ichthyofaunistic provinces. This study evaluated the ichthyofauna present in the Canal da Piracema and the abundance and distribution of long-distance migratory fish species along this fish pass system (evaluated possible selectivity. The Canal da Piracema was shown to be difficult to sample because of its environmental heterogeneity: artificial ponds, ladders and nature-like fish pass. To solve this problem, we used several fishing gears, adequate for the several biotopes present (unstructured and structured littoral were sampled with seining nets and electrofishing; lentic were sampled with gillnets and longlines (deeper areas; and rapid water areas were sampled with cast nets. The ichthyofauna of the Canal da Piracema followed the pattern for South America and the Paraná River, with a predominance of Characiformes and Siluriformes. The most representative families were Characidae, Anostomidae, Pimelodidae and Loricariidae. We captured 116 species (17 were long-distance migratory during the period studied. Small-sized species were predominant in unstructured and structured littoral areas, especially Bryconamericus exodon and Apareiodon affinis.The most abundant species was Hypostomus spp. in lentic areas, followed by Iheringichthys labrosus. Hoplias aff. malabaricus predominated in deeper lentic areas. Long-distance migratory species were abundant in rapid waters; they were Prochilodus lineatus and Leporinus elongatus. The sharp reduction in the number of species, including migratory ones, is an indication that the Canal da Piracema is selecting the species that ascend it. Therefore, the search for information on the efficiency of the various fish passes present in the Canal da Piracema is fundamental, to facilitate upward movements of fish. If this is reached, this

  11. Tiny worms from a mighty continent: high diversity and new phylogenetic lineages of African monogeneans.

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    Přikrylová, Iva; Vanhove, Maarten P M; Janssens, Steven B; Billeter, Paul A; Huyse, Tine

    2013-04-01

    The family Gyrodactylidae contains one of the most significant radiations of platyhelminth fish parasites. The so-called hyperviviparity is very rare in the animal kingdom, and the rapid generation time can lead to an explosive population growth, which can cause massive losses in farmed fish. Here we present the first molecular phylogeny including all-but-one African genera, inferred from ITS and 18S rDNA sequences. The validity of nominal genera is discussed in relation to the systematic value of morphological characters traditionally used for generic identification. New complete 18S rDNA sequences of 18 gyrodactylid species of eight genera together with ITS rDNA gene sequences of eight species representing seven genera were generated and complemented with GenBank sequences. The maximum likelihood and Bayesian analyses pointed to a paraphyletic nature of African Gyrodactylus species. They formed well-supported clades possibly indicating speciation within host taxa: (1) parasites of cichlids (Cichlidae); (2) parasites of catfishes (Siluriformes), consisting of a lineage infecting mochokids and one infecting clariids. Macrogyrodactylus spp. firmly clustered into a monophyletic group. We found that Swingleus and Fundulotrema are very closely related and clearly cluster within Gyrodactylus. This supports earlier claims as to the paraphyly of the nominal genus Gyrodactylus as it is currently defined, and necessitates a revision of Swingleus and Fundulotrema. Molecular dating estimates confirmed a relatively young, certainly post-Gondwanan, origin of gyrodactylid lineages. Building on the previously suggested South-American origin of viviparous gyrodactylids, the dataset suggests subsequent intercontinental dispersal to Africa and from there repeated colonisation of the Holarctic. Even though the African continent has been heavily under sampled, the present diversity is far greater than in the intensively studied European fauna, probably because of the high endemicity

  12. Spawning areas, dispersion and microhabitats of fish larvae in the Anavilhanas Ecological Station, rio Negro, Amazonas State, Brazil

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    Edinbergh C. de Oliveira

    Full Text Available The abundance and distribution of ichthyoplankton and their relationships to current velocity, temperature, dissolved oxygen, pH and electrical conductivity of the water in the Anavilhanas Ecological Station, Negro River, Amazonas State, Brazil, were analyzed. Preferred microhabitats for spawning, dispersion and nursery were also verified. Sampling was undertaken during the falling water period of 2001 and the rising water period of 2002, in a section of 100 km subdivided into 5 subsections, with a total of 20 stations (5 beaches, 5 ravines, 5 channels, and 5 lake channels at night and during the day at the surface and at the bottom. 647 eggs and 4,187 larvae were captured, belonging to 10 families and four orders: Characiformes (6, Siluriformes (2, Perciformes (1, and Clupeiformes (1. Engraulidae (55.39%, Pimelodidae (30.45%, Auchenipteridae (5.23% and Sciaenidae (5.13% were the dominant families. The hierarchical statistical model (ANOVA with three factors (microhabitat, depth and period was applied to the environmental variables and the larval abundance, showing greater abundances of sciaenids in the ravines and lower abundances of engraulids in the channels. The highest captures were obtained at lower temperature values, at the bottom during the day and at the surface at night, suggesting an active larval behavior. The presence of the four larval development stages in all subsection for pimelodids and sciaenids, and in three subsections for engraulids, indicates that the Anavilhanas Ecological Station is an important spawning and nursery area for species of these groups in the Negro River. Larvae abundance of all characiform families was extremely low (from 0.1 to 1.17%, suggesting that they do not spawn in this system.

  13. Potensi Ikan Air Tawar Budidaya sebagai Bahan Baku Produk Nutraseutikal Berbasis Serum Albumin Ikan

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    Rini Susilowati

    2015-05-01

    Full Text Available Nutraseutikal berbasis Fish Serum Albumin (FSA adalah produk komersial yang berasal dari sumber perairan. Namun, oleh karena produk ini secara umum diproduksi dari ikan gabus (Channa striata di alam, pasokan bahan baku dapat menjadi masalah pada produksi yang berkesinambungan. Penelitian ini telah dilakukan dengan menganalisis kandungan FSA dari 17 ikan air tawar budidaya, untuk mendapatkan bahan baku alternatif bagi produk nutraseutikal berbasis FSA. 3–10 individu ikan air tawar (150–500 g dari jenis ordo Perciformes, Anguilliformes, Cypriniformes, Osteoglossiformes, dan Siluriformes telah diambil secara acak dari lokasi budidaya ikan di Bogor dan Cianjur (Jawa Barat. Ekstraksi protein larut air dilakukan menggunakan Ultra Turax homogeniser dengan pelarut akuabides. Analisis FSA telah dilakukan menggunakan High Performance Liquid Chromatography (HPLC. Hasil dari penelitian menunjukkan bahwa kadar FSA dari 17 ekstrak air dari ikan berada pada rentang 42,51 to 215,57 mg/g, dengan kadar FSAikan gabus pembanding adalah 107,28 ± 3,2 mg/g. Konsentrasi FSA tertinggi ditemukan sebesar 215,57 ± 52,84 mg/g dari ekstrak air ikan gurame (Osphronemus gouramy. Analisis lebih lanjut terhadap komposisi asam amino menggunakan Gas Chromatography – Flame Ionization Detector (GC-FID menemukan bahwa ekstrak air ikan gabus memiliki konsentrasi asam amino esensial dan non-esensial yang lebih tinggi dibandingkan dengan ikan gurame. Hal ini menunjukkan banyaknya protein lain selain FSA pada ekstrak air ikan gabus dibandingkan ikan gurame. Berdasarkan hasil ini, ekstrak air ikan gurame memiliki konsentrasi FSA yang lebih besar dan relatif lebih murni dibandingkan ekstrak air ikan gabus, sehingga merupakan alternatif yang prospektif sebagai bahan baku untuk produk nutraseutikal berbasis FSA.

  14. A large 28S rDNA-based phylogeny confirms the limitations of established morphological characters for classification of proteocephalidean tapeworms (Platyhelminthes, Cestoda

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    Alain de Chambrier

    2015-04-01

    Full Text Available Proteocephalidean tapeworms form a diverse group of parasites currently known from 315 valid species. Most of the diversity of adult proteocephalideans can be found in freshwater fishes (predominantly catfishes, a large proportion infects reptiles, but only a few infect amphibians, and a single species has been found to parasitize possums. Although they have a cosmopolitan distribution, a large proportion of taxa are exclusively found in South America. We analyzed the largest proteocephalidean cestode molecular dataset to date comprising more than 100 species (30 new, including representatives from 54 genera (80% and all subfamilies, thus significantly improving upon previous works to develop a molecular phylogeny for the group. The Old World origin of proteocephalideans is confirmed, with their more recent expansion in South America. The earliest diverging lineages are composed of Acanthotaeniinae and Gangesiinae but most of the presently recognized subfamilies (and genera appear not to be monophyletic; a deep systematic reorganization of the order is thus needed and the present subfamilial system should be abandoned. The main characters on which the classical systematics of the group has been built, such as scolex morphology or relative position of genital organs in relation to the longitudinal musculature, are of limited value, as demonstrated by the very weak support for morphologically-defined subfamilies. However, new characters, such as the pattern of uterus development, relative ovary size, and egg structure have been identified, which may be useful in defining phylogenetically well-supported subgroups. A strongly supported lineage infecting various snakes from a wide geographical distribution was found. Although several improvements over previous works regarding phylogenetic resolution and taxon coverage were achieved in this study, the major polytomy in our tree, composed largely of siluriform parasites from the Neotropics, remained

  15. Utilization of the fish ladder at the Engenheiro Sergio Motta Dam, Brazil, by long distance migrating potamodromous species

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    Sérgio Makrakis

    Full Text Available Utilization of the fish ladder installed at the Engenheiro Sergio Motta Dam (also known as Porto Primavera on the Paraná River, Southern Brazil, by long-distance migrating potamodromous species (sampling Protocol I, and ascending and descending movements (Protocol II were evaluated. Three pools along the fish ladder (designated as lower, middle, and upper were sampled monthly between December, 2004 and March, 2005 to determine the abundance of species in the ladder. The ascending and descending movements of the species in the ladder were also analyzed in the same period. In the samples for both protocols, 37 species representing 17 families and 5 orders (Characiformes, Siluriformes, Perciformes, Gymnotiformes, and Myliobatiformes were recorded. Characiformes were represented by 21 species. Long- distance migratory species (11 species predominated in the ladder (60% of the total number of individuals, with high abundance of Rhinelepis aspera (5645 individuals. For protocol I, mean abundance varied greatly among the months and pools, with lowest values in December and March for all pools, and highest in January for the lower pool due to high capture of R. aspera. Fish abundance declined from the lower to the upper pool, especially for R. aspera and Rhaphiodon vulpinus. For Protocol II, 17 species were recorded ascending the ladder, where Astyanax altiparanae and Leporinus friderici were the most abundant species (684 and 111 individuals, respectively. However, 18 species showed descending movements, with high captures of Metynnis maculatus and A. altiparanae (339 and 319 individuals, respectively. Twelve species (52% moved in both directions, and among the seven migratory species sampled, four were recorded ascending and descending, and three species only ascending the ladder. The fish ladder appears to selectively favor species with high swimming capabilities. A discussion is presented on the requirements for future research on attraction to the

  16. A large 28S rDNA-based phylogeny confirms the limitations of established morphological characters for classification of proteocephalidean tapeworms (Platyhelminthes, Cestoda).

    Science.gov (United States)

    de Chambrier, Alain; Waeschenbach, Andrea; Fisseha, Makda; Scholz, Tomáš; Mariaux, Jean

    2015-01-01

    Proteocephalidean tapeworms form a diverse group of parasites currently known from 315 valid species. Most of the diversity of adult proteocephalideans can be found in freshwater fishes (predominantly catfishes), a large proportion infects reptiles, but only a few infect amphibians, and a single species has been found to parasitize possums. Although they have a cosmopolitan distribution, a large proportion of taxa are exclusively found in South America. We analyzed the largest proteocephalidean cestode molecular dataset to date comprising more than 100 species (30 new), including representatives from 54 genera (80%) and all subfamilies, thus significantly improving upon previous works to develop a molecular phylogeny for the group. The Old World origin of proteocephalideans is confirmed, with their more recent expansion in South America. The earliest diverging lineages are composed of Acanthotaeniinae and Gangesiinae but most of the presently recognized subfamilies (and genera) appear not to be monophyletic; a deep systematic reorganization of the order is thus needed and the present subfamilial system should be abandoned. The main characters on which the classical systematics of the group has been built, such as scolex morphology or relative position of genital organs in relation to the longitudinal musculature, are of limited value, as demonstrated by the very weak support for morphologically-defined subfamilies. However, new characters, such as the pattern of uterus development, relative ovary size, and egg structure have been identified, which may be useful in defining phylogenetically well-supported subgroups. A strongly supported lineage infecting various snakes from a wide geographical distribution was found. Although several improvements over previous works regarding phylogenetic resolution and taxon coverage were achieved in this study, the major polytomy in our tree, composed largely of siluriform parasites from the Neotropics, remained unresolved and

  17. Molecular cloning and characterization of pirarucu (Arapaima gigas follicle-stimulating hormone and luteinizing hormone β-subunit cDNAs.

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    Thais Sevilhano

    Full Text Available The common gonadotrophic hormone α-subunit (GTHα has been previously isolated by our research group from A. gigas pituitaries; in the present work the cDNA sequences encoding FSHβ and LHβ subunits have also been isolated from the same species of fish. The FSH β-subunit consists of 126 amino acids with a putative 18 amino acid signal peptide and a 108 amino acid mature peptide, while the LH β-subunit consists of 141 amino acids with a putative 24 amino acid amino acid signal peptide and a 117 amino acid mature peptide. The highest identity, based on the amino acid sequences, was found with the order of Anguilliformes (61% for FSHβ and of Cypriniformes (76% for LHβ, followed by Siluriformes, 53% for FSHβ and 75% for LHβ. Interestingly, the identity with the corresponding human amino acid sequences was still remarkable: 45.1% for FSHβ and 51.4% for LHβ. Three dimensional models of ag-FSH and ag-LH, generated by using the crystal structures of h-FSH and h-LH as the respective templates and carried out via comparative modeling and molecular dynamics simulations, suggested the presence of the so-called "seat-belt", favored by a disulfide bond formed between the 3rd and 12th cysteine in both β-subunits. The sequences found will be used for the biotechnological synthesis of A. gigas gonadotrophic hormones (ag-FSH and ag-LH. In a first approach, to ascertain that the cloned transcripts allow the expression of the heterodimeric hormones, ag-FSH has been synthesized in human embryonic kidney 293 (HEK293 cells, preliminarily purified and characterized.

  18. Molecular cloning and characterization of pirarucu (Arapaima gigas) follicle-stimulating hormone and luteinizing hormone β-subunit cDNAs.

    Science.gov (United States)

    Sevilhano, Thais; Carvalho, Roberto Feitosa de; Oliveira, Nélio Alessandro de Jesus; Oliveira, João Ezequiel; Maltarollo, Vinicius Gonçalves; Trossini, Gustavo; Garcez, Riviane; Bartolini, Paolo

    2017-01-01

    The common gonadotrophic hormone α-subunit (GTHα) has been previously isolated by our research group from A. gigas pituitaries; in the present work the cDNA sequences encoding FSHβ and LHβ subunits have also been isolated from the same species of fish. The FSH β-subunit consists of 126 amino acids with a putative 18 amino acid signal peptide and a 108 amino acid mature peptide, while the LH β-subunit consists of 141 amino acids with a putative 24 amino acid amino acid signal peptide and a 117 amino acid mature peptide. The highest identity, based on the amino acid sequences, was found with the order of Anguilliformes (61%) for FSHβ and of Cypriniformes (76%) for LHβ, followed by Siluriformes, 53% for FSHβ and 75% for LHβ. Interestingly, the identity with the corresponding human amino acid sequences was still remarkable: 45.1% for FSHβ and 51.4% for LHβ. Three dimensional models of ag-FSH and ag-LH, generated by using the crystal structures of h-FSH and h-LH as the respective templates and carried out via comparative modeling and molecular dynamics simulations, suggested the presence of the so-called "seat-belt", favored by a disulfide bond formed between the 3rd and 12th cysteine in both β-subunits. The sequences found will be used for the biotechnological synthesis of A. gigas gonadotrophic hormones (ag-FSH and ag-LH). In a first approach, to ascertain that the cloned transcripts allow the expression of the heterodimeric hormones, ag-FSH has been synthesized in human embryonic kidney 293 (HEK293) cells, preliminarily purified and characterized.

  19. Effects of Temperature on Auditory Sensitivity in Eurythermal Fishes: Common Carp Cyprinus carpio (Family Cyprinidae) versus Wels Catfish Silurus glanis (Family Siluridae)

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    Maiditsch, Isabelle Pia; Ladich, Friedrich

    2014-01-01

    Background In ectothermal animals such as fish, -temperature affects physiological and metabolic processes. This includes sensory organs such as the auditory system. The reported effects of temperature on hearing in eurythermal otophysines are contradictory. We therefore investigated the effect on the auditory system in species representing two different orders. Methodology/Principal Findings Hearing sensitivity was determined using the auditory evoked potentials (AEP) recording technique. Auditory sensitivity and latency in response to clicks were measured in the common carp Cyprinus carpio (order Cypriniformes) and the Wels catfish Silurus glanis (order Siluriformes) after acclimating fish for at least three weeks to two different water temperatures (15°C, 25°C and again 15°C). Hearing sensitivity increased with temperature in both species. Best hearing was detected between 0.3 and 1 kHz at both temperatures. The maximum increase occurred at 0.8 kHz (7.8 dB) in C. carpio and at 0.5 kHz (10.3 dB) in S. glanis. The improvement differed between species and was in particular more pronounced in the catfish at 4 kHz. The latency in response to single clicks was measured from the onset of the sound stimulus to the most constant positive peak of the AEP. The latency decreased at the higher temperature in both species by 0.37 ms on average. Conclusions/Significance The current study shows that higher temperature improves hearing (lower thresholds, shorter latencies) in eurythermal species from different orders of otophysines. Differences in threshold shifts between eurythermal species seem to reflect differences in absolute sensitivity at higher frequencies and they furthermore indicate differences to stenothermal (tropical) species. PMID:25255456

  20. Fish remnants from the excavations of the Bronze Age barrow near Maryanskoe village (Dnepropetrovsk region, Ukraine

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    O. M. Kovalchuk

    2014-10-01

    Full Text Available The Bronze Age mound (2.5–2.3 kya BC is located near the Maryanskoe village (Apostolovskyi district, Dnepropetrovsk region and was excavated in 1953. The results of determination of the fish remnants, which were found during the excavation, are presented in the paper. Eleven species belonging to 9 genera, 5 families and 5 orders (Acipenseriformes, Cypriniformes, Siluriformes, Esociformes, Perciformes were identified: russian sturgeon Acipenser gueldenstaedtii Brandt et Ratzeburg, 1833, stellate sturgeon A. stellatus Pallas, 1771, common ide Idus idus (Linnaeus, 1758, common roach Rutilus rutilus (Linnaeus, 1758, pontic roach R. frisii (Nordmann, 1840, common bream Abramis brama (Linnaeus, 1758, common carp Cyprinus carpio Linnaeus, 1758, tench Tinca tinca (Linnaeus, 1758, european catfish Silurus glanis Linnaeus, 1758, northern pike Esox lucius (Linnaeus, 1758, and zander Sander lucioperca (Linnaeus, 1758. Most of them are quite common in the Dnieper river basin. It was found that carp fishes predominate in the number of species. Most of the bone remnants in the collection belong to zander, catfish and pike, while common roach, pontic roach and common bream are identified by the few bones. This may indicate a different role of these species in the diet of the local population. The ratio of skeletal elements in the collection is the evidence of the fish cutting on the site. Body length and weight was reconstructed for 64 fish specimens. It was found that they were mature and small-sized, except for catfish, pike and perch. Taking into account the characteristics of the funeral rituals of the Yamna culture population, fish bones from the mound near Maryanskoe can be remnants of the parting meal.

  1. Catfish science: Status and trends in the 21st century

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    Kwak, Thomas J.; Porath, Mark T.; Michaletz, Paul H.; Travnichek, Vincent H.

    2011-01-01

    Catfish science, the study of the fish order Siluriformes, is a diverse and expanding field in terms of advances and breadth of topics. We compiled literature from primary fisheries journals as an index of interest and advances in catfish science to examine temporal trends in the field. The number of catfish scientific publications varied over the past century with strong peaks during 1975–1979 and 2005–2010, which may be the result of interactive scientific and societal influences. Catfish biology was the predominant publication topic until the late 1990s, when ecology, techniques, and management publications became more prevalent. Articles on catfish ecology were most numerous in both the first and second international catfish symposia, but publications on techniques and conservation were more numerous in the second catfish symposium than the first. We summarize the state of knowledge, recent advances, and areas for future attention among topics in catfish science, including sampling and aging techniques, population dynamics, ecology, fisheries management, species diversity, nonnative catfish, and human dimensions, with an emphasis on the gains in this second symposium. Areas that we expect to be pursued in the future are development of new techniques and validation of existing methods; expansion of research to less-studied catfish species; broadening temporal, spatial, and organizational scales; interdisciplinary approaches; and research on societal views and constituent demands. Meeting these challenges will require scientists to span beyond their professional comfort zones to effectively reach higher standards. We look forward to the coming decade and the many advances in the conservation, ecology, and management of catfish that will be shared.

  2. Diversidade e distribuição espaço-temporal de anuros em região com pronunciada estação seca no sudeste do Brasil Temporal and spatial distribution and diversity of anurans in a region with pronounced dry season in southeastern Brazil

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    Tiago Gomes dos Santos

    2007-03-01

    Full Text Available As atividades antrópicas têm alterado profundamente os ambientes naturais e muitas vezes afetado a diversidade e distribuição dos anuros. O objetivo deste estudo foi investigar as seguintes questões: (1 qual a composição da anurofauna em uma região de pastagem com clima marcadamente sazonal no extremo noroeste paulista? (2 como adultos e girinos das espécies se distribuem temporal e espacialmente? (3 a riqueza de espécies está correlacionada com descritores da heterogeneidade dos hábitats de reprodução? Na área estudada foram registradas 20 espécies de anuros, distribuídas em 11 gêneros de quatro famílias: Leptodactylidae (9, Hylidae (8, Microhylidae (2 e Bufonidae (1. Destas, Chaunus schneideri (Werner, 1894, Physalaemus centralis Bokermann, 1962 e Physalaemus fuscomaculatus (Steindachner, 1864 foram registradas apenas por coleta de girinos, enquanto Dendropsophus minutus (Peters, 1872 e Leptodactylus labyrinthicus (Spix, 1824 ocorreram somente em corpos d'água próximos aos selecionados. As espécies registradas são conhecidas por sua ampla distribuição geográfica e por colonizarem áreas alteradas em outras localidades. Não houve correlação entre a riqueza de espécies e a complexidade estrutural dos corpos d'água. Entretanto, a maior riqueza de espécies foi registrada nos corpos d'água de longa duração. As poças temporárias de hidroperíodo instável foram colonizadas inicialmente por leptodactilídeos, enquanto que as poças permanentes ou temporárias estáveis foram colonizadas por hilídeos. A atividade de vocalização e de reprodução da maioria das espécies foi restrita ao período quente e chuvoso do ano, um padrão típico de ambientes tropicais sazonais. Cinco espécies [Chaunus schneideri, Dendropsophus nanus (Boulenger, 1889, Hypsiboas albopunctatus Spix, 1824, Leptodactylus podicipinus (Cope, 1862 e Pseudopaludicola aff. saltica (Cope, 1887] vocalizaram durante a estação seca e chuvosa, mas

  3. A review of estuarine fish research in South America: what has been achieved and what is the future for sustainability and conservation?

    Science.gov (United States)

    Blaber, S J M; Barletta, M

    2016-07-01

    Estuarine fish research in South America began in the early 20th Century, but it is only within the last 40 years that detailed studies have been undertaken. This review firstly summarizes research results from South American estuaries by geographic area, starting with the temperate south-east, then the temperate-sub-tropical transition zone in Brazil, then the semi-arid and tropical estuaries of north and north-east Brazil including the Amazon complex, then the north and Caribbean coasts and finally down the Pacific coast of the continent. They include almost all types of estuarine systems, from large open systems (e.g. the temperate Rio de La Plata and tropical Amazon) to extensive coastal lakes (e.g. the temperate Patos Lagoon and tropical Cienega Grande de Santa Marta). They encompass a broad range of climatic and vegetation types, from saltmarsh systems in the south-east and fjords in the south-west to both arid and humid tropical systems, dominated by mangroves in the north. Their tidal regimes range from microtidal (e.g. Mar Chiquita, Argentina) through mesotidal (e.g. Goiana, Brazil) to macrotidal in the Amazon complex where they can exceed 7 m. The review uses where possible the recent standardization of estuarine fish categories and guilds, but the ways that fishes use tropical South American systems may necessitate further refinements of the categories and guilds, particularly in relation to freshwater fishes, notably the Siluriformes, which dominate many north and north-east South American systems. The extent to which South American studies contribute to discussions and paradigms of connectivity and estuarine dependence is summarized, but work on these topics has only just begun. The anthropogenic issue of pollution, particularly in relation to heavy metals and fishes and fisheries in estuaries is more advanced, but the possible effects of climate change have barely been addressed. Studies around conservation and management are briefly reviewed and

  4. DIETA DO MANDUBÉ, Ageneiosus ucayalensis (CASTELNAU, 1855, (OSTEICHTHYES: AUCHENIPTERIDAE DO RESERVATÓRIO DA USINA HIDRELÉTRICA COARACY NUNES, FERREIRA GOMES-AMAPÁ, BRASIL

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    Júlio César Sá-Oliveira

    2014-10-01

    Full Text Available O objetivo deste trabalho foi analisar a dieta de Ageneiosus ucayalensis do reservatório da Usina Hidrelétrica Coaracy Nunes, no município de Ferreira Gomes/AP. As amostragens foram feitas bimestralmente em três estações de coleta na área do reservatório entre julho/2009 e julho/2010. As coletas foram realizadas utilizando redes de espera, organizadas em baterias com sete redes cada e diferentes distâncias entre nós. Após a captura, foi realizada a biometria dos exemplares, sendo seus estômagos retirados, fixados e conservados para análise em laboratório. A proporção sexual foi realizada no intuito de verificar se houve diferença significativa entre os sexos. Os itens alimentares do conteúdo estomacal foram agrupados em categorias amplas e analisados através dos métodos de frequência de ocorrência e volumétrico, combinados no Índice de Importância Alimentar (IAi, por período sazonal. Os resultados evidenciaram que a proporção entre os sexos foi de 1:1, com uma leve predominância de fêmeas. Quanto à alimentação, a espécie mostrou-se carnívora, com a dieta baseada principalmente em microcrustáceos, crustáceos, peixes e material não identificável. Variações sazonais na dieta não foram nítidas e, provavelmente, estão relacionadas tanto à disponibilidade das presas na área quanto à manipulação do nível da água do reservatório pelo controle de comportas. Palavras-chave: alimentação, UHE, peixes, Siluriformes, IAi. DOI: http://dx.doi.org/10.18561/2179-5746/biotaamazonia.v4n3p73-82

  5. The fate of the duplicated androgen receptor in fishes: a late neofunctionalization event?

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    Haendler Bernard

    2008-12-01

    Full Text Available Abstract Background Based on the observation of an increased number of paralogous genes in teleost fishes compared with other vertebrates and on the conserved synteny between duplicated copies, it has been shown that a whole genome duplication (WGD occurred during the evolution of Actinopterygian fish. Comparative phylogenetic dating of this duplication event suggests that it occurred early on, specifically in teleosts. It has been proposed that this event might have facilitated the evolutionary radiation and the phenotypic diversification of the teleost fish, notably by allowing the sub- or neo-functionalization of many duplicated genes. Results In this paper, we studied in a wide range of Actinopterygians the duplication and fate of the androgen receptor (AR, NR3C4, a nuclear receptor known to play a key role in sex-determination in vertebrates. The pattern of AR gene duplication is consistent with an early WGD event: it has been duplicated into two genes AR-A and AR-B after the split of the Acipenseriformes from the lineage leading to teleost fish but before the divergence of Osteoglossiformes. Genomic and syntenic analyses in addition to lack of PCR amplification show that one of the duplicated copies, AR-B, was lost in several basal Clupeocephala such as Cypriniformes (including the model species zebrafish, Siluriformes, Characiformes and Salmoniformes. Interestingly, we also found that, in basal teleost fish (Osteoglossiformes and Anguilliformes, the two copies remain very similar, whereas, specifically in Percomorphs, one of the copies, AR-B, has accumulated substitutions in both the ligand binding domain (LBD and the DNA binding domain (DBD. Conclusion The comparison of the mutations present in these divergent AR-B with those known in human to be implicated in complete, partial or mild androgen insensitivity syndrome suggests that the existence of two distinct AR duplicates may be correlated to specific functional differences that may be

  6. Impact of fishing with Tephrosia candida (Fabaceae) on diversity and abundance of fish in the streams at the boundary of Sinharaja Man and Biosphere Forest Reserve, Sri Lanka.

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    Epa, Udaya Priyantha Kankanamge; Mohotti, Chamari Ruvandika Waniga Chinthamanie

    2016-09-01

    Local communities in some Asian, African and American countries, use plant toxins in fish poisoning for fishing activities; however, the effects of this practice on the particular wild fish assemblages is unknown. This study was conducted with the aim to investigate the effects of fish poisoning using Tephrosia candida, on freshwater fish diversity and abundance in streams at the boundary of the World Natural Heritage site, Sinharaja Forest Reserve, Sri Lanka. A total of seven field trips were undertaken on a bimonthly basis, from May 2013 to June 2014. We surveyed five streams with similar environmental and climatological conditions at the boundary of Sinharaja forest. We selected three streams with active fish poisoning practices as treatments, and two streams with no fish poisoning as controls. Physico-chemical parameters and flow rate of water in selected streams were also measured at bimonthly intervals. Fish were sampled by electrofishing and nets in three randomly selected confined locations (6 x 2 m stretch) along every stream. Fish species were identified, their abundances were recorded, and Shannon-Weiner diversity index was calculated for each stream. Streams were clustered based on the Bray-Curtis similarity matrix for fish composition and abundance. Physico-chemical parameters of water were not significantly different among streams (P > 0.05). A total of 15 fish species belonging to four different orders Cypriniformes, Cyprinodontiformes, Perciformes and Siluriformes were collected; nine species (60 %) were endemic, and six (40 %) were native species. From these, 13 fish species were recorded in streams with no poisoning, while five species were recorded in streams where poisoning was practiced. Four endemic and one native fish species were locally extinct in streams where fish poisoning was active. Fish abundance was significantly higher in control streams (32-39/m2) when compared to treatment streams (5-9/m2) (P fish poisoning with T. candida may

  7. Multiple source genes of HAmo SINE actively expanded and ongoing retroposition in cyprinid genomes relying on its partner LINE

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    Gan Xiaoni

    2010-04-01

    Full Text Available Abstract Background We recently characterized HAmo SINE and its partner LINE in silver carp and bighead carp based on hybridization capture of repetitive elements from digested genomic DNA in solution using a bead-probe 1. To reveal the distribution and evolutionary history of SINEs and LINEs in cyprinid genomes, we performed a multi-species search for HAmo SINE and its partner LINE using the bead-probe capture and internal-primer-SINE polymerase chain reaction (PCR techniques. Results Sixty-seven full-size and 125 internal-SINE sequences (as well as 34 full-size and 9 internal sequences previously reported in bighead carp and silver carp from 17 species of the family Cyprinidae were aligned as well as 14 new isolated HAmoL2 sequences. Four subfamilies (type I, II, III and IV, which were divided based on diagnostic nucleotides in the tRNA-unrelated region, expanded preferentially within a certain lineage or within the whole family of Cyprinidae as multiple active source genes. The copy numbers of HAmo SINEs were estimated to vary from 104 to 106 in cyprinid genomes by quantitative RT-PCR. Over one hundred type IV members were identified and characterized in the primitive cyprinid Danio rerio genome but only tens of sequences were found to be similar with type I, II and III since the type IV was the oldest subfamily and its members dispersed in almost all investigated cyprinid fishes. For determining the taxonomic distribution of HAmo SINE, inter-primer SINE PCR was conducted in other non-cyprinid fishes, the results shows that HAmo SINE- related sequences may disperse in other families of order Cypriniforms but absent in other orders of bony fishes: Siluriformes, Polypteriformes, Lepidosteiformes, Acipenseriformes and Osteoglossiforms. Conclusions Depending on HAmo LINE2, multiple source genes (subfamilies of HAmo SINE actively expanded and underwent retroposition in a certain lineage or within the whole family of Cyprinidae. From this

  8. Histological development of the digestive system of the Amazonian pimelodid catfish Pseudoplatystoma punctifer.

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    Gisbert, E; Moreira, C; Castro-Ruiz, D; Oztürk, S; Fernández, C; Gilles, S; Nuñez, J; Duponchelle, F; Tello, S; Renno, J F; García-Dávila, C; Darias, M J

    2014-11-01

    The organogenesis of the digestive system was described in the Amazonian pimelodid catfish species Pseudoplatystoma punctifer from hatching (3.5 mm total length, TL) to 41 days post-fertilization (dpf) (58.1 mm TL) reared at 28°C. Newly hatched larvae showed a simple digestive tract, which appeared as a straight undifferentiated and unfolded tube lined by a single layer of columnar epithelial cells (future enterocytes). During the endogenous feeding period, comprised between 20 and 96 h post-fertilization (3.5 to 6.1 mm TL), the larval digestive system experienced a fast transformation with the almost complete development and differentiation of most of digestive organs (buccopahrynx, oesophagus, intestine, liver and exocrine pancreas). Yolk reserves were not completely depleted at the onset of exogenous feeding (4 dpf, 6.1 mm TL), and a period of mixed nutrition was observed up to 6 to 7 dpf (6.8 to 7.3 mm TL) when yolk was definitively exhausted. The stomach was the organ that latest achieved its complete differentiation, characterized by the development of abundant gastric glands in the fundic stomach between 10 and 15 dpf (10.9 to 15.8 mm TL) and the formation of the pyloric sphincter at the junction of the pyloric stomach and the anterior intestine at 15 dpf (15.8 mm TL). The above-mentioned morphological and histological features observed suggested the achievement of a digestive system characteristic of P. punctifer juveniles and adults. The ontogeny of the digestive system in P. punctifer followed the same general pattern as in most Siluriform species so far, although some species-specific differences in the timing of differentiation of several digestive structures were noted, which might be related to different reproductive guilds, egg and larval size or even different larval rearing practices. According to present findings on the histological development of the digestive system in P. punctifer, some recommendations regarding the rearing practices of this

  9. Composição e estrutura da comunidade de peixes de um afluente do rio Tietê, bacia do Alto rio Paraná.

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    Jane Piton Serra

    2014-09-01

    Full Text Available A América do Sul contém a mais rica e variada ictiofauna de água doce do mundo, porém, muito dessa diversidade ainda é desconhecida, tanto na sua composição, quanto em aspectos ecológicos, biológicos e taxonômicos. Essa riqueza, entretanto tem sido afetada pelas alterações antrópicas dos ambientes naturais. Assim, o objetivo do presente trabalho foi determinar a composição e estrutura da ictiofauna do ribeirão Borá, afluente do rio Cubatão, drenagem do rio Tietê, bacia do alto rio Paraná. O local estudado foi um trecho de quinta ordem e aproximadamente 80 m de extensão do ribeirão, localizado no município de Nova Aliança, São Paulo. O ribeirão Borá apresenta características de ambiente antropizado, como pouca vegetação marginal e pontos poucos profundos com sedimento predominantemente arenoso. Foram realizadas 10 coletadas diurnas entre Novembro de 2002 e Março de 2004. O tempo de coleta e os equipamentos utilizados foram padronizados. Foram coletadas 41 espécies de peixes, pertencentes a 15 famílias e cinco ordens, totalizando 1.459 exemplares. A ordem Characiformes apresentou maior riqueza, seguida por Siluriformes. A família Characidae foi a mais rica, seguida por Loricariidae e Cichlidae. Os maiores valores para riqueza e abundância foram encontrados na estação chuvosa. Os resultados obtidos neste trabalho constituem uma forma importante de conhecimento da ictiofauna e reforçam a importância de estudos sobre a composição e estrutura das comunidades de peixes, tanto em ambientes ainda não modificados, quanto naqueles com intenso processo de degradação, como subsídio para conservação e recuperação dos ambientes aquáticos.

  10. Salinity tolerance of non-native suckermouth armoured catfish (Loricariidae: Pterygoplichthys) in south-eastern Mexico: implications for invasion and dispersal

    Science.gov (United States)

    Capps, Krista A.; Nico, Leo G.; Mendoza-Carranza, Manuel; Arevalo-Frias, Wendi; Ropicki, Andrew J.; Heilpern, Sebastian A.; Rodiles-Hernandez, Rocio

    2011-01-01

    1. Salinity tolerance is one of several important physiological attributes that determine invasion success and the pattern of dispersal of introduced aquatic organisms. Introduced freshwater fishes able to tolerate elevated salinities have the potential to invade and exploit brackish-water (mixohaline) environments and use estuaries and coastal waters as 'bridges' for dispersing from one coastal river system to another. 2. Several members of the neotropical suckermouth armoured catfish genus Pterygoplichthys (Siluriformes: Loricariidae) have established non-native populations in inland waters of North and Central America, Asia and islands in the Caribbean, and Pacific and Indian oceans. Loricariids are generally considered to be strictly freshwater; but a few naturally occur in mesohaline habitats. 3.Catch and habitat data from 2004–2005 and 2009–2011 fish surveys in the Grijalva–Usumacinta River delta region (south-eastern Mexico) confirmed that introduced Pterygoplichthys populations established in upstream freshwater sites (where these catfish are abundant) have recently dispersed into downstream oligohaline and mesohaline estuarine habitats. During 2009–2011 surveys, these non-native catfish — tentatively identified as P. pardalis or its hybrids — were found in sites with salinities ranging from 1 to 8 ppt (mean 5.2 ppt). 4.Acute-salinity experiments were conducted with Pterygoplichthys (110–302 mm standard length, N=140) captured in the Grijalva–Usumacinta Basin to determine upper salinity tolerance levels. Tests demonstrated that individuals maintained in salinities of 0.2 ppt were able to survive abrupt (acute) exposure to salinities up to 10 ppt with little mortality over 10 days (240 h experimental endpoint). A few individuals survived abrupt exposure to 11 and 12 ppt for 20 or more hours, although none survived more than a few hours at 16 ppt or greater. 5.These field and experimental results provide quantitative evidence that non

  11. Patterns of commercial fish landings in the Loreto region (Peruvian Amazon) between 1984 and 2006.

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    Garcia, Aurea; Tello, Salvador; Vargas, Gladis; Duponchelle, Fabrice

    2009-03-01

    Patterns of commercial fish catches over the period from 1984 to 2006 were studied in the Loreto region and in Iquitos, which is the most important town of the region and the principal fish marketplace of the Peruvian Amazon. Despite important inter-annual variations, the overall fish landings have significantly increased in the region during this period. The same three species dominated the catches during the whole period (Prochilodus nigricans, Potamorhina altamazonica and Psectrogaster amazonica), making up about 62% of the catches. However, the number of species exploited by commercial fisheries increased considerably during the 22 years of this study (from about 21 species in 1984 to over 65 in 2006), although part of the difference may be accounted for by a better identification of individual species nowadays. At the same time, the large high-valued species, such as Arapaima gigas, Colossoma macropomum and Brachyplatystoma rousseauxii, declined significantly and were replaced by smaller, short-lived and lower-valued species. Catches of the silver Arahuana (Osteoglossum bicirrhosum) also declined significantly during the studied period, strengthening recent warnings about the species' conservation status (Moreau and Coomes, Oryx 40:152-160, 2006). The relative proportions of the trophic groups (detritivores, omnivores and piscivores) remained relatively constant over the study period, but there were significant changes in the relative abundances of the species groups. The proportion of the dominant group, the Characiformes, which averaged about 81% of the catches, increased between 1984 and 2006, whereas the proportion of the Siluriformes and Perciformes remained constant. On the other hand, the proportion of Osteoglossiformes, represented only by two well known species (Arapaima gigas and Osteoglossum bicirrhosum), declined sharply during the same period. Important differences were observed between the landings of Iquitos and the landing of the whole Loreto

  12. Nocturnal and diurnal activity of armored suckermouth catfish (Loricariidae: Pterygoplichthys associated with wintering Florida manatees (Trichechus manatus latirostris

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    Leo G. Nico

    2010-01-01

    Full Text Available Several Pterygoplichthys species, members of the Neotropical catfish family Loricariidae, have been widely introduced outside their native ranges. In this paper, I present observations on the diel activity pattern of non-native Pterygoplichthys, tentatively identified as P. disjunctivus, with respect to their attachment and grazing on endangered Florida manatees, Trichechus manatus latirostris. The study was conducted in December 2009 at Volusia Blue Spring, an artesianal spring system in the St. Johns River basin, Florida (USA. Supplemented by information gathered during previous visits to the spring site, this study revealed that adult Pterygoplichthys are active throughout the diel period (day, twilight and night. However, juvenile Pterygoplichthys were largely nocturnal and only at night did they consistently join adults in attaching to manatees. The juveniles generally remain hidden during the day, probably responding to presence of diurnal predators, mainly birds. Differences in diel behaviors among different Pterygoplichthys size classes in Florida are consistent with published observations on loricariids inhabiting clearwater streams within their native ranges.Várias espécies de Pterygoplichthys, siluriformes Neotropicais da família Loricariidae, tem sido largamente introduzidos além de suas áreas naturais de ocorrência. Neste artigo, eu apresento observações dos padrões de atividade diária de uma população não nativa de Pterygoplichthys, identificada tentativamente como P. disjunctivus, associados com a espécie ameaçada de peixe-boi nativa da Flórida, Trichechus manatus latirostris. O estudo foi conduzido em dezembro de 2009 em Volusia Blue Spring um sistema artesiano na bacia do rio St. John, Flórida (USA. Suplementado por informações reunidas durante visitas prévias ao sítio em análise, este estudo revelou que Pterygoplichthys adultos estiveram ativos durante a maioria dos períodos (dia, crepúsculo e noite. No

  13. Anatomia Funcional e Morfometria do Intestino no Teleostei (Pisces de Água Doce Surubim (Pseudoplatystoma coruscans - Agassiz, 1829

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    Seixas Filho José Teixeira de

    2001-01-01

    Full Text Available Os objetivos do presente trabalho foram estudar a anatomia funcional e a morfometria comparativas nos intestinos médio e no reto, do peixe Teleostei, surubim, Pseudoplatystoma coruscans (Agassiz, 1829 (Siluriformes, Siluroidei, Pimelodidae, de hábito alimentar carnívoro, em duas classes de tamanho, visando fornecer referência à nutrição para o ajuste de diferentes sistemas de alimentação artificial para essa espécie nativa. Por meio destes estudos concluiu-se que o intestino do surubim, sob o ponto de vista morfológico, deve ser denominado, de intestino médio e reto, devido a presença da valva ileorretal e da invaginação valvar intestinal entre esses segmentos. Em relação ao padrão de enrolamento do intestino, apesar do plano geral do intestino médio e do reto ter sido mantido, as alças do intestino médio apresentaram arranjo indefinido, não tendo sido determinado um arranjo-padrão para a espécie. O arranjo intestinal é compatível ao da maioria de peixes carnívoros, ou predominantemente carnívoro, uma vez que seu intestino é quase retilíneo; contudo, as circunvoluções das alças finais do intestino médio talvez possam ser vistas como adaptações a um possível regime onívoro, preferencialmente carnívoro. As pregas intestinais encontram-se mais complexas e desenvolvidas no intestino dos exemplares da segunda classe de tamanho. Procurando estabelecer relações entre o arranjo das pregas das mucosas e a velocidade de transporte do alimento no intestino médio da espécie estudada, sugere-se que o padrão longitudinal, com numerosas anastomoses retardam o avanço do alimento em sentido aboral, o que possibilita maior período digestivo e, conseqüentemente, maior aproveitamento dos nutrientes, pela exposição do material alimentar à mucosa intestinal por período maior, além de contribuir para a preparação do bolo fecal. As pregas da mucosa próxima ao ânus têm direção longitudinal, sugerindo auxílio na

  14. Sardinella brasiliensis: tipo de desova, fecundidade e potencial reprodutivo relativo. I. Área entre 23º40's e 24º20's, Brasil Sardinella brasiliensis: spawning, fecundity and relative spawning power. I. Area between 23º40's and 24º20's, Brazil

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    A. E. A. de M Vazzoler

    1976-01-01

    Full Text Available 1 Sardinella brasilieneis apresenta desova individual do tipo total; entretanto as fêmeas desovantes nao maturam todas ao mesmo tempo, ocorrendo maturação e desovas sucessivas de grupos de indivíduos (cardumes, o que determina um período de desova prolongado; 2 Durante o período de desova de 1964-65 foram constatados valores para os índices de maturidade e gonadal, e para o fator de condição, mais eleva dos que durante 1963-64, o que sugere melhores condições alimentares durante tal período; 3 Os pesos médios por classe de comprimento, para as fêmeas, também foram mais elevados durante 1964-65, bem como o comprimento médio, a fecundidade média por fêmea e o potencial reprodutivo relativo; 4 Os valores dos índices.considerados foram distintos dentro de um mes mo período, entre as varias fases, mas também variaram significativamente para uma mesma fase, entre os dois períodos, indicando não poderem ser utilizados como fator isolado para a caracterização do grau de desenvolvimento dos ovarios; 5 As relações entre fecundidade e comprimento total, peso total, peso das gonadas e peso do corpo mostraram-se significativamente diferentes entre os dois períodos; 6 O tamanho dos óvulos, para uma mesma fase, variou de um período para o outro, sendo mais elevado durante 1964-65; 7 Os resultados mostram que, apesar dos índices e relações terem um significado biológico, referem-se a organismos vivos submetidos à ação do meio ambiente variável, e não podem ser encarados como fixos; sua utilização deve ser associada a observações puramente biológicas, servindo apenas como "auxiliares" na determinação ou avaliação de um processo biológico qualquer.This paper is a contribution to the knowledgment of some aspects of the reproduction of Sardinella brasiliensis (Steindachner, 1879 from the area between 23º40'S and 24º20'S, Brazil. The individual spawning, fecundity, maturation and gonadal indexes, condition factor

  15. Ecología trófica y aspectos reproductivos de Trichomycterus areolatus (Pisces,Trichomycteridaeen ambientes lóticos artificiales

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    Evelyn Habit

    2005-06-01

    Full Text Available Doce de las dieciséis especies de peces presentes en la cuenca del río Itata ingresan al menos en una época del año a los canales de riego, constituyendo un hábitat frecuentemente utilizado por la ictiofauna nativa. Sin embargo sólo el siluriforme Trichomycterus areolatus se encuentra en altas abundancias todo el año, siendo la especie dominante de estos ambientes fluviales artificiales. Entre los factores que pueden dar cuenta de su éxito relativo dentro de los canales están sus hábitos bentónicos y adaptación a ambientes ritrales, una oferta de recursos tróficos concordante con sus hábitos alimentarios y una menor abundancia de depredadores. En este estudio se analiza comparativamente la ecología trófica de esta especie en 174 individuos que habitan en el río Itata (Octava Región de Chile y 231 de canales de riego que nacen de este sistema fluvial. Además se analizan las relaciones de talla-peso y frecuencia estacional de estados reproductivos, con el fin de inferir acerca del estado de las poblaciones y su condición de residentes en canales de riego. La dieta de las poblaciones de canales incluye una mayor riqueza de táxones y una mayor cantidad de presas consumidas respecto a las del curso natural. El análisis de selectividad muestra que T. areolatus prefiere, tanto en el río como en los canales de riego,presas tales como Chironomidae, Baetidae, Elmidae, Plecoptera y Hyallela. Además, en los canales de riego prefiere presas de mayor biomasa como los lumbricúlidos. Si bien las poblaciones locales de canales presentan, al igual que los ejemplares de río, un crecimiento de tipo isométrico, éstos alcanzan mayores tallas y pesos corporales que los individuos de los cauces naturales. De acuerdo al análisis de estados reproductivos de 345 ejemplares en diferentes períodos del año, las poblaciones de ambientes de canal se reproducen sincrónicamente con las del río, aunque con un leve retardo en la actividad

  16. Seasonal changes in the gonadossomatic index, allometric condition factor and sex ratio of an auchenipterid catfish from eastern Amazonia

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    Tiago Magalhães da Silva Freitas

    2011-01-01

    Full Text Available The aim of the present study was to evaluate the seasonal pattern of the gonadosomatic index (GSI, condition factor (K, and sex ratio in the catfish Auchenipterichthys longimanus (Siluriformes: Auchenipteridae as an approach to identify its reproductive period. A total of 589 A. longimanus specimens (251 males and 338 females were captured in the rivers of the Caxiuanã National Forest, in the Brazilian state of Pará, between July, 2008 and July, 2009. Among the male specimens, 171 were classified as adults and 80 as juveniles, while there were 249 adults and 89 juvenile females. Using a sinusoidal equation, analysis of the GSI revealed a reproductive asynchrony between the genders, with males attaining their highest GSI values in January, while females peaked in March. For males, the sinusoidal regression for GSI values was significant only when used the complete data set (P=0.001, wears no trend was identified for bimonthly means (P=0.136. For females, by contrast, significant values were obtained for both the complete data set (P=0.012 and bimonthly GSI means (P=0.026. For the condition factor, the sinusoidal equation returned significant seasonal variation in both raw data (P=0.02 and with mean values (P=0.00 for males, but only with raw data for females (P=0.04, which appears to reflect variation in the energy budget between genders. With regard to the sex ratio, more reproductive females were captured than males in January and March, 2009, which suggests a pattern of segregation related to the reproductive process. These parameters are fundamental to the assessment, protection, and management of natural fish stocks, as well as providing guidelines for the development of conservation strategies.O objetivo deste estudo foi avaliar alterações sazonais no índice gonadossomático (IGS%, fator de condição (K e proporção sexual, a fim de determinar o período de atividade reprodutiva do bagre Auchenipterichthys longimanus (Siluriformes