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Sample records for anglerfishes teleostei lophiiformes

  1. APPLICATION OF QUALITY INDEX METHOD (QIM SCHEME IN SHELFLIFE STUDY OF ANGLERFISH (Lophius piscatorius

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    L. Pennisi

    2011-01-01

    Full Text Available The aim was to evaluate a Quality Index Method (QIM scheme for fresh Anglerfish (Lophius piscatorius. Anglerfish were stored at 0±2 °C on ice up to 9 days. Total Mesophilic Counts (TMC, Total Psychrophilic Counts (TPC and counts of Specific Spoilage Organisms (SSOs were done. An high correlation between the Quality Index (QI and storage time on ice and between the Quality Index (QI and H2S-producing bacteria counts was found. The remaining storage time could be estimated with accuracy of ±1.5 days when the Anglerfish were evaluated with QIM.

  2. A synthesis of the early life history of the anglerfish, Lophius piscatorius (Linnaeus, 1758) in northern British waters

    DEFF Research Database (Denmark)

    Hislop, J.R.G.; Gallego, A.; Heath, M.R.;

    2001-01-01

    and an examination of the geographical distribution of pelagic and demersal anglerfish. Otolith incremental analysis indicates that the pelagic phase is relatively long(ca. 120 days) and growth during the first year of life is rapid. A particle tracking model predicts that pelagic post larvae of known...... age caught west of the outer Hebrides could originate from the shelf edge west of Ireland. the Rockall Plateau and the northern perimeter of the North Sea. whereas those caught in the northern North Sea are likely to originate from the western edge of the Norwegian Deep and the shelf edge west and...

  3. Characterization of a somatostatin-28 containing the (Tyr-7, Gly-10) derivative of somatostatin-14: a terminal active product of prosomatostatin II processing in anglerfish pancreatic islets.

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    Morel, A.; Gluschankof, P; Gomez, S. (Sara); Fafeur, V; Cohen, P.

    1984-01-01

    Anglerfish (Lophius piscatorius) Brockmann organs contain a form of somatostatin-14, identical to the hypothalamic tetradecapeptide, and two distinct forms of somatostatin-28, which can be separated by reversed-phase high-pressure liquid chromatography (HPLC). Analysis of the NH2-terminal amino acid sequence and comparison of the ability to incorporate 125I indicate that one of these forms corresponds to an octacosapeptide including in its sequence the (Tyr-7, Gly-10) derivative of somatostat...

  4. Inaccuracy of Labeling and Visual Inspection for Microsporidian Parasites in Anglerfish Lophius litulon (Jordan, 1902) Collected from Chinese Retail Markets in Sardinia, Italy.

    Science.gov (United States)

    Meloni, Domenico; Arca, Costantino; Piras, Pierluigi

    2015-06-01

    The aim of the present study was to evaluate the accuracy of labeling and the efficacy of visual inspection to detect the lesions by visible parasites in anglerfish Lophius litulon. One hundred samples were collected over a 2-year period (2011 to 2012) from Chinese retail markets in Sardinia, Italy. To assess the conformity of the items with the trade name, a preliminary visual inspection of the samples by a simple morphological analysis was performed. According to the Council Regulations (EC) 104/2000, 1224/2009, and 2074/2005, the Italian labels were examined to verify the appropriate indication of relevant information on traceability (trade name, scientific name, geographical area, and production method), and the samples of L. litulon were subjected to visual inspection to detect "visible parasites." Altogether, a high percentage of mismatching (70%) between the scientific name and trade name was pointed out. Moreover, 60% of the samples were visibly infected by Spraguea lophii, a microsporidian parasite of the nervous tissue that forms typical lesions (xenomas) in the fish flesh near the vertebral column. Although S. lophii is not pathogenic to humans, the presence of xenomas can decompose the fish flesh and render it unfit for human consumption. The high percentage of mislabeling, together with the inaccuracy in the visual inspection by Chinese food business operators highlighted the need to improve the European Union control system of fishery products imported from China and marketed in Europe. PMID:26038919

  5. Phylogenetic relationships within the algae scraping cyprinid genus Capoeta (Teleostei: Cyprinidae).

    Czech Academy of Sciences Publication Activity Database

    Levin, B. A.; Freyhof, J.; Lajbner, Zdeněk; Perea, S.; Doadrio, I.

    Moscow : -, 2010. 150-150. [Moscow International Conference "Molecular Phylogenetics" /2./. 18.05.2010-21.05.2010, Moscow] R&D Projects: GA MŠk LC06073 Institutional research plan: CEZ:AV0Z50450515 Keywords : Teleostei: Cyprinidae Subject RIV: EG - Zoology

  6. Feeding habits of the Oligocene bristlemouth fish Scopeloides glarisianus (Teleostei: Stomiiformes: Gonostomatidae)

    Czech Academy of Sciences Publication Activity Database

    Přikryl, Tomáš; Prokofiev, A. M.; Krzemiński, W.

    2012-01-01

    Roč. 45, č. 4 (2012), s. 377-386. ISSN 0016-6995 Institutional research plan: CEZ:AV0Z30130516 Keywords : Teleostei * Gonostomatidae * functional morphology * feeding habits * cannibalism * palaeoecology * Palaeogene Subject RIV: DB - Geology ; Mineralogy Impact factor: 1.052, year: 2012

  7. OLDEST STEM TELEOSTEI FROM THE LATE LADINIAN (MIDDLE TRIASSIC) OF SOUTHERN CHINA

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    ANDREA TINTORI; ZUOYU SUN; PEIGANG NI; CRISTINA LOMBARDO; DAYONG JIANG; RYOSUKE MOTANI

    2015-01-01

    The origin of the largest modern vertebrate group, the Teleostei, saw major refinements in the last decades, thanks to newly discovered and stratigraphically closely spaced Triassic Lagerstätten. Here we report the oldest Pholidophoriformes (stem teleosts) that were collected during a large scale yet detailed excavation of Upper Ladinian (Middle Triassic) marine deposits in Xingyi City, Guizhou Province, China. Taxonomic comparisons support the erection of a new pholidophorid genus, Malingich...

  8. Conducta socioespacial frente a un ambiente nuevo de Pseudotropheus tropheops Regan, 1921 (Teleostei, Cichlidae)

    OpenAIRE

    Redondo, T.; Medina, Rosario

    1985-01-01

    Sociospatial behaviour of Pseudotropheus tropheopsReagan, 1921 ina new environment (Teleostei, Cichlidae).- The relationships between agonistic behaviour and spatial variables within a group of six captive inmature Pseudotropheus tropheops is studied. Data on frequency of Eghts and spatial positions are anaiysed during three periods of time within the 24 hours foiiowing modification of the medium. Three phases of social behaviour are established: 1) exploration, performed by th...

  9. Complete mitochondrial genome of the endemic species Korean aucha perch Coreoperca herzi (Teleostei, Centrarchiformes, Sinipercidae).

    Science.gov (United States)

    Park, Chang Eon; Park, Gun-Seok; Kwak, Yunyoung; Hong, Sung-Jun; Khan, Abdur Rahim; Jung, Byung Kwon; Park, Yeong-Jun; Kim, Min-Chul; Kim, Kgu-Hwan; Park, Hee Cheon; Lee, In-Jung; Shin, Jae-Ho

    2016-09-01

    In this study, we sequenced the complete mitochondrial genome of the endemic species Korean aucha perch Coreoperca herzi (Teleostei, Centrarchiformes, Sinipercidae). The mitogenome, consisting of 16 495 base pairs (bp), encoded 13 protein-coding genes (PCGs), 2 ribosomal RNAs (rRNAs), 22 transfer RNAs (tRNAs) and 2 non-coding region. The overall base composition of C. herzi is G + C: 46.3%, A + T: 53.7%, apparently with a slight AT bias. Phylogenetic analysis showed that the C. herzi was closed to Coreoperca kawamebari. PMID:26181210

  10. Complete mitochondrial genome of the Korean endemic species Microphysogobio yaluensis (Teleostei, Cypriniformes, Cyprinidae).

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    Park, Chang Eon; Park, Gun-Seok; Kim, Min-Chul; Kim, Kgu-Hwan; Park, Hee Cheon; Lee, In-Jung; Shin, Jae-Ho

    2016-09-01

    In this study, we sequenced the complete mitochondrial genome of the Korean endemic species Microphysogobio yaluensis (Teleostei, Cypriniformes, Cyprinidae). The mitogenome, consisted of 16 601 base pairs (bp), encoding 13 protein-coding genes (PCGs), 2 ribosomal RNAs (rRNAs), 22 transfer RNAs (tRNAs) and 2 non-coding regions. The overall base composition of M. yaluensis was G + C: 43.8%, A + T: 56.2%, apparently with a slight AT bias. Phylogenetic analysis showed that M. yaluensis was close to Hemibarbus mylodon. PMID:26260172

  11. The complete mitochondrial genome sequence of Squalidus japonicus coreanus (Teleostei, Cypriniformes, Cyprinidae).

    Science.gov (United States)

    Eon Park, Chang; Park, Gun-Seok; Kwak, Yunyoung; Kim, Min-Chul; Kim, Kgu-Hwan; Park, Hee Cheon; Shin, Jae-Ho

    2016-09-01

    The short-barbel gudgeon Squalidus japonicus coreanus (Teleostei, Cypriniformes, Cyprinidae) is a subspecies of S. japonicus, and is endemic to Korea. The complete mitochondrial genome sequence consisted of 16 597 base pairs (bp) encoding 13 protein-coding genes (PCGs), two ribosomal RNAs (rRNAs), 22 transfer RNAs (tRNAs), and two non-coding regions. The overall base composition of S. japonicus coreanus was G + C: 47.4% and A + T: 52.6%, apparently with a slight AT bias. Phylogenetic analysis showed that S. japonicus coreanus was closely related to Pungtungia herzi. PMID:26329666

  12. OLDEST STEM TELEOSTEI FROM THE LATE LADINIAN (MIDDLE TRIASSIC OF SOUTHERN CHINA

    Directory of Open Access Journals (Sweden)

    ANDREA TINTORI

    2015-11-01

    Full Text Available The origin of the largest modern vertebrate group, the Teleostei, saw major refinements in the last decades, thanks to newly discovered and stratigraphically closely spaced Triassic Lagerstätten. Here we report the oldest Pholidophoriformes (stem teleosts that were collected during a large scale yet detailed excavation of Upper Ladinian (Middle Triassic marine deposits in Xingyi City, Guizhou Province, China. Taxonomic comparisons support the erection of a new pholidophorid genus, Malingichthys gen. nov., with two species. The new genus shows a partially fused skull roof, a preopercular bone with a hockey-stick shape and, for the first time in Pholidophoridae, supraneural elements. Most Triassic marine vertebrate clades (fishes and reptiles, Malingichthys included first emerged in the South China Block, with Late Ladinian most showing an important faunal transformation that was strengthened by our last findings. The material here described is about 2 million years older than the previous records for pholidophorids. 

  13. Anatomical stomach description of dog fish, Hydrolycus armatus (Jardine & Schomburgk, 1841, (Teleostei: Cynodontidae

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    Gerlane de Medeiros Costa

    2015-12-01

    Full Text Available Hydrolycus armatus (dog fish is a Teleostei of Cynodontidae Family that forms a distinct group of Neotropical Characiformes. This species is a predator, pelagic, freshwater and carnivorous and ichthyophagic feeding habits. Biological studies on fish are important in fishery, already that they are used as parameters to keep the exploitation to sustainable levels. This study aimed to describe the stomach anatomy of H. armatus, in order to generate basic information of this body of this vertebrate. We used ten (10 specimens of H. armatus, from the Teles Pires, city of Carlinda-MT, being this dissected and analyzed. The stomach of saccular format presented the regions cardial, pyloric and fundic, last being this last larger than the others. The anatomical features presented by the liver and stomach of H. armatus confirmed the relationship between the anatomy of these organs and their feeding habits being these, therefore, characteristics of predatory species, carnivorous and preferably ichthyophagics.

  14. The complete mitochondrial genome of Taiwanese spined loach Cobitis cf. sinensis (Teleostei: Cobitidae).

    Science.gov (United States)

    Chen, I-Shiung; Wang, Chih-Wen

    2015-01-01

    In this study, the complete mitogenome sequence of Taiwanese spined loach, Cobitis cf. sinensis Sauvage and Dabry de Thiersant (Teleostei: Cobitidae) from northern Taiwan has been amplified and sequenced by employing long polymerase chain reaction method. The mitogenome, consisting of 16,553 bp, had the typical vertebrate mitochondrial gene arrangement, including 13 protein-coding genes, 22 transfer RNAs, 2 ribosomal RNAs genes and a non-coding control region (CR). CR of 914 bp length is located between tRNAPro and tRNAPhe. The overall base composition of the loach is 29.9% for A, 25.9% for C, 27.8% for T and 16.3% for G, with a slight AT bias of 57.7%. The complete mitogenome may provide rather essential and important DNA molecular data for further phylogenetic analysis for not only congeneric species but also higher different taxa of the loaches. PMID:24409842

  15. [Description of three new monogenean gill parasites from Mormyrus rume (Valenciennes, 1846) (Teleostei: Mormyridae) in Ivory Coast].

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    Blahoua, K G; Pariselle, A; N'Douba, V; Kone, T; Kouassi, N J

    2009-03-01

    The study of the gill parasites from elephant fish Mormyrus rume Valenciennes, 1846 (Teleostei: Mormyridae) from the Ayamé man-made Lake (Ivory Coast) revealed the presence of three new monogenean species of the genus Bouixella Euzet & Dossou, 1976, which can be mainly distinguished from all other species of the genus by the morphology and the size of the sclerotised parts of the haptor (dorsal and ventral anchor, dorsal and ventral bar) and by the size and the structure of the male copulatory organ. In this paper, descriptions of Bouixella gorei n. sp., Bouixella yaoi n. sp. and Bouvixella koutouani n. sp. are given. PMID:19353952

  16. Hyphessobrycon ocasoensis sp. n. (Teleostei, Characidae una nueva especie para el Alto Cauca, Colombia

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    García-Alzate, C. A.

    2008-12-01

    Full Text Available Hyphessobrycon ocasoensis n. sp. (Teleostei, Characidae a new species from the Alto Cauca, Colombia Hyphessobrycon ocasoensis n. sp. (Characiformes, Characidae from heterorhabdus group (Gery, 1977 is described from the upper Cauca River in Colombia. The new species is distinguished from all other known species by the following combination of characters: three unbranched and eight branched fins in the dorsal fin; short maxillary bone with one or no teeth; four small foramens in the maxillary bone, and five in the premaxillary; 5-17 scales with pores in the lateral line, six between the lateral line and anal-fin origin, six between the lateral line and pelvic-fin origin, and nine predorsals; depth of the caudal peduncle has a mean of 16.7% in standard length; interorbital width 50.6% in head; a dark spot on caudal peduncle and a dark lateral band that extends vertically from the dorsal–fin origin to the tips of the middle caudal fin rays. Physical and chemical data of their habitat are included.

  17. A new species of Speleogobius (Teleostei: Gobiidae) from the Western Mediterraenean Sea.

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    Kovačić, Marcelo; Ordines, Francesc; Schliewen, Ulrich K

    2016-01-01

    A new goby species, Speleogobius llorisi sp. nov. (Teleostei: Gobiidae) is described from the circalittoral sea bed at 46-69 m depth off the Balearic Islands, western Mediterranean. Six specimens, four females and two males, of the new species were collected from beam trawl samples carried out on the red algae beds off the south west coast of Mallorca Island. Among others, the main traits that differentiate the new species from the only congeneric species, S. trigloides, are the presence of preopercular head canal with pores γ, δ, ε vs. preopercular head canal absent; a longer snout, equal or longer than eye vs. shorter than eye; lower lip ending anteriorly slightly in front of upper lip vs. upper lip slightly protruding lower lip; scales in lateral series 28 or 29 vs. 26; scales in transverse series 6 vs.7-8. It also differs from S. trigloides in some non-overlapping morphometrics and in coloration. All individuals of the new species were collected from Peyssonnelia beds, beds of red algae dominated by species of the family Peyssonneliaceae. The generic diagnosis of Speleogobius is revised. PMID:27395553

  18. The importance of gobies (Gobiidae, Teleostei) as hosts and transmitters of parasites in the SW Baltic

    Science.gov (United States)

    Zander, C. D.; Strohbach, U.; Groenewold, S.

    1993-02-01

    The parasite fauna of five goby species (Gobiidae, Teleostei) was investigated in the Baltic Sea during the period 1987 to 1990. 13 parasite species were found in samples from the Lübeck Bight: Bothriocephalus scorpii, Schistocephalus sp. (Cestoda); Cryptocotyle concavum, Cryptocotyle lingua, Podocotyle atomon, Derogenes varicus (Digenea); Hysterothylacium sp. (cf. auctum), Contracaecum sp., Anisakis simplex (Nematoda); Corynosoma sp., Echinorhynchus gadi, Neoechinorhynchus rutili, Pomphorhynchus laevis (Acanthocephala). The number of parasite species were: 10 in the sand goby Pomatoschistus minutus, 8 in the black goby Gobius niger, 7 in the two-spotted goby Gobiusculus flavescens, 6 in the common goby Pomatoschistus microps, and 5 in the painted goby Pomatoschistus pictus. Neoechinorhynchus rutili occurred only in P. minutus, and Corynosoma sp. only in G. niger. The extent to which the gobies were parasitized clearly depended on the respective ways of life and, moreover, on the kind of prey ingested by the hosts. Additionally, the age of the hosts might be important. The highest rate of parasitism, more than 60%, was reached by Hysterothylacium sp. in G. niger and by Cryptocotyle concavum in P. microps. Infestation incidence lay mostly below 40% which means a satellite species status (Holmes, 1991). The number of parasite species was highest in summer; the highest intensities of single parasites occurred in spring ( Podocotyle atomon) or autumn ( Crytocotyle concavum). Bothriocephalus scorpii, Hysterothylacium sp. and Podocotyle infested their juvenile hosts very early, but only Hysterothylacium was accumulated by G. niger during its whole life span, whereas Bothriocephalus persisted also in older gobies in low intensities. The cercariae of Cryptocotyle spp. penetrate actively into their hosts; all the other parasites named were transmitted in larval form by prey organisms which consisted mainly of planktonic and benthic crustaceans. The gobies were final hosts

  19. Dactylogyrid monogeneans parasitising Cyphocharax voga (Hensel) (Teleostei: Curimatidae) from the Pampas region, Argentina: new and previously described species.

    Science.gov (United States)

    Rossin, María Alejandra; Timi, Juan Tomás

    2016-09-01

    Most studies on dactylogyrid monogeneans in Argentina have been carried out during 1980s and 1990s. Many of these species have been later synonymised and other remain under a confusing taxonomic status, particularly those parasitising Cyphocharax voga (Hensel) (Teleostei: Curimatidae). In order to clarify the identity of dactylogyrids, new material was collected from fishes in Lake Chascomús, Buenos Aires Province, Argentina. A total of four species was found in the gills of C. voga. Two known species, Curvianchoratus singularis (Suriano, 1980) Suriano, 1986 and Palombitrema triangulum (Suriano, 1981) Suriano, 1997, are redescribed and their generic and specific status discussed, and two new species are described. Urocleidoides surianoae n. sp. can be distinguished from its congeners by having an anterior medial projection in the ventral bar and a laminar ligament connecting the base of the male copulatory organ and accessory piece. Annulotrematoides bonaerensis n. sp. differs from its congeners principally by having a ventral bar with an anterior medial projection. The diversity of dactylogyrids harboured by C. voga indicates the need of further studies in the Pampas region, which will provide interesting and valuable sources of evidence for future zoogeographical and evolutionary research on dactylogyrids in the Neotropics. PMID:27522368

  20. [Ontogenetic Mechanisms of Explosive Morphological Divergence in the Lake Tana (Ethiopia) Species Flock of Large African Barbs (Labeobarbus; Cyprinidae; Teleostei)].

    Science.gov (United States)

    Shkila, F N; Lazebny, O E; Kapitanova, D V; Abdissa, Belay; Borisov, V B; Smirnov, S V

    2015-01-01

    Species flock of Lake Tana (Ethiopia) large African barbs (Labeobarbus; Cyprinidae; Teleostei) was studied as a model system for investigating ontogenetic mechanisms of the explosive morphological divergence often accompanying sympatric speciation in bony fishes. Comparative morphological analysis carried out with the use ofgeometric morphometric techniques revealed quantitative differences in the head shapes of species under study. Comparative analysis of skull development revealed significant interspecies differences in the temporal characteristics of craniogenesis in these species. These two lines of evidence suggest that heterochronies in craniogenesis underlie divergence in the head shapes of adult Tana barbs. This prediction was verified via experimental changes of temporal characteristics of craniogenesis in L. intermedius, a putative ancestor for the Lake Tana species flock. For this aim, timing and rate of skull development were changed by artificial manipulation of thyroid hormone levels. In sum, it was shown that it is heterochronies that underlie an explosive morphological divergence of the Lake Tana barbs species flock. Our findings together with those reported in the literature suggest variability in the activity of the hypothalamic-pituitary-thyroid axis to contribute to these heterochronies. PMID:26606829

  1. Convergent evolution of ecomorphological adaptations in geographically isolated Bay gobies (Teleostei: Gobionellidae) of the temperate North Pacific.

    Science.gov (United States)

    Ellingson, Ryan A; Swift, Camm C; Findley, Lloyd T; Jacobs, David K

    2014-01-01

    North Pacific Bay gobies (Teleostei: Gobioidei: Gobionellidae) inhabit bays, beaches, coastal lagoons, and estuaries of temperate Asia and North America, but are absent from the boreal northernmost Pacific. Previously, morphological characters conventionally subdivided the clade into two groups - an elongate-bodied, infaunal-inhabiting "Astrabe" group, and a deeper-bodied, non-infaunal "Chasmichthys" group - each with a disjunct East-West (amphi-) Pacific distribution. Here we use mitochondrial and multi-locus nuclear DNA sequence data to show that several morphological characters previously used to delimit these two groups have in fact arisen independently on both sides of the Pacific, revealing convergence of ecologically adaptive characters within a geographically divided clade. Basal divergence of the resultant tree coincides with a dramatic global cooling event at the Eocene/Oligocene transition, without evidence of subsequent trans-Pacific migration. A novel approach to partitioning sequence data by relative rate, as opposed to traditional gene/codon position partitioning, was used to help distinguish phylogenetic signal from noise on a per-site basis. Resulting improvements in topology and nodal support, along with decreased computational effort, suggest that this partitioning strategy may be useful for future studies in phylogenetics and phylogenomics. PMID:24148989

  2. Catálogo dos Peixes Marinhos do Laboratório de Ictiologia da Universidade Federal do Rio de Janeiro. Parte I: Chondrichthyes (Rajiformes). Teleostei (Elopiformes a Dactylopteriformes)

    OpenAIRE

    Paulo Roberto Duarte Lopes

    1989-01-01

    The present paper is the first part of the catalogue of marine fishes belonging to the collection of the Laboratory of Ichthyology (Universidade Federal do Rio de Janeiro-RJ) to be published. Here are included Chondrichthyes (Rajiformes) and part of Osteichthyes, Teleostei (Elopiformes to Dactylopteriformes) in a total amount of 30 families, 52 genera and 62 species. The most part of the material have been collected at the littoral of the State of Rio de Janeiro. For each species considered i...

  3. COMPARAÇÃO ENTRE OS MÉTODOS DE EXTRAÇÃO DE METACERCÁRIAS DE ASCOCOTYLE SP (TREMATODA: DIGENEA) DOS TECIDOS DE MUGIL LIZA VALENCIENNES, 1836 (TELEOSTEI: MUGILIDAE)

    OpenAIRE

    Renato Ribeiro Nogueira Ferraz; Thales Kodi Namba; Carolina Alencar Nigro; Francisco Sandro Menezes Rodrigues; João Victor Fornari; Anderson Sena Barnabé

    2014-01-01

    The demand and consumption of fish and their derivatives has increased considerably in recent years. However, fish are ideal hosts of numerous parasites, highlighting the need to develop new research methodologies for its detection. The aim of present study was to compare the efficacy of Ascocotyle metacercariae (Trematoda: Digenea) extraction from visceral tissues of Mugil liza Valenciennes, 1836 (Teleostei: Mugilidae) by two methods: homogenization by blender or mixe...

  4. Evolution of microhabitat association and morphology in a diverse group of cryptobenthic coral reef fishes (Teleostei: Gobiidae: Eviota)

    KAUST Repository

    Tornabene, Luke

    2013-01-01

    Gobies (Teleostei: Gobiidae) are an extremely diverse and widely distributed group and are the second most species rich family of vertebrates. Ecological drivers are key to the evolutionary success of the Gobiidae. However, ecological and phylogenetic data are lacking for many diverse genera of gobies. Our study investigated the evolution of microhabitat association across the phylogeny of 18 species of dwarfgobies (genus Eviota), an abundant and diverse group of coral reef fishes. In addition, we also explore the evolution of pectoral fin-ray branching and sensory head pores to determine the relationship between morphological evolution and microhabitat shifts. Our results demonstrate that Eviota species switched multiple times from a facultative hard-coral association to inhabiting rubble or mixed sand/rubble habitat. We found no obvious relationship between microhabitat shifts and changes in pectoral fin-ray branching or reduction in sensory pores, with the latter character being highly homoplasious throughout the genus. The relative flexibility in coral-association in Eviota combined with the ability to move into non-coral habitats suggests a genetic capacity for ecological release in contrast to the strict obligate coral-dwelling relationship commonly observed in closely related coral gobies, thus promoting co-existence through fine scale niche partitioning. The variation in microhabitat association may facilitate opportunistic ecological speciation, and species persistence in the face of environmental change. This increased speciation opportunity, in concert with a high resilience to extinction, may explain the exceptionally high diversity seen in Eviota compared to related genera in the family. © 2012 Elsevier Inc.

  5. Length-weight and length-length relationships of seven loach species (Teleostei: Cypriniformes from five localities in northern Western Ghats, India

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    Ashwini Keskar

    2015-12-01

    Full Text Available Length-weight (LWR and length-length (LLR relationships of seven loach species (Teleostei: Cypriniformes: Botia striata, Lepidocephalichthys thermalis, Paracanthocobitis mooreh, Indoreonectes evezardi, Nemacheilus anguilla, Nemachilichthys rueppelli and Schistura denisoni were studied from five localities within the Krishna River system of the Indian Western Ghats: Lonawala (Indrayani River, Paud (Mula River, Warje (Mutha River, Bhor (Nira River and Patan (Koyna River.  With the exception of L. thermalis all species are endemic to peninsular India, and to our knowledge this is the first presentation of LWR and LLR data for them.  New maximum lengths are also reported for I. evezardi, N. anguilla, N. rueppelli and S. denisoni. 

  6. Next-generation sequencing yields the complete mitochondrial genome of the flathead mullet, Mugil cephalus cryptic species in East Australia (Teleostei: Mugilidae).

    Science.gov (United States)

    Shen, Kang-Ning; Chen, Ching-Hung; Hsiao, Chung-Der; Durand, Jean-Dominique

    2016-09-01

    In this study, the complete mitogenome sequence of a cryptic species from East Australia (Mugil sp. H) belonging to the worldwide Mugil cephalus species complex (Teleostei: Mugilidae) has been sequenced by next-generation sequencing method. The assembled mitogenome, consisting of 16,845 bp, had the typical vertebrate mitochondrial gene arrangement, including 13 protein-coding genes, 22 transfer RNAs, 2 ribosomal RNAs genes and a non-coding control region of D-loop. D-loop consists of 1067 bp length, and is located between tRNA-Pro and tRNA-Phe. The overall base composition of East Australia M. cephalus is 28.4% for A, 29.3% for C, 15.4% for G and 26.9% for T. The complete mitogenome may provide essential and important DNA molecular data for further phylogenetic and evolutionary analysis for flathead mullet species complex. PMID:25693715

  7. Description de trois Monogènes nouveaux, parasites branchiaux de Mormyrus rume (Teleostei : Mormyridae en Côte d’Ivoire

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    Blahoua K.G.

    2009-03-01

    Full Text Available L’étude de la parasitofaune branchiale d’un Mormyridae, Mormyrus rume Valenciennes, 1846 (Teleostei : Mormyridae, capturé dans le lac de retenue d’Ayamé I en Côte d’Ivoire (Afrique de l’Ouest a révélé la présence de trois Monogènes nouveaux du genre Bouixella Euzet & Dossou, 1976, qui se différencient des autres espèces du genre par la taille et la morphologie des pièces haptoriales (anchor dorsal et ventral, barre dorsale et ventrale et de l’appareil génital mâle. Nous décrivons dans ce travail ces trois nouvelles espèces : Bouixella gorei n. sp., Bouixella yaoi n. sp. et Bouixella koutouani n. sp.

  8. Calicobenedenia Polyprioni n. gen., n. sp. (Monogenoidea: Capsalidae) from the external surfaces of wreckfish, Polyprion americanus (Teleostei: Polyprionidae), in the north Atlantic.

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    Kritsky, D C; Fennessy, C J

    1999-04-01

    Calicobenedenia polyprioni n. sp. (Capsalidae) is described from the external surfaces (skin and eye) of wreckfish, Polyprion americanus (Teleostei, Perciformes, Polyprionidae), from the north Atlantic Ocean. The monotypic Calicobenedenia n. gen. is proposed for this species and is characterized, in part, by its members possessing an aseptate haptor armed with 14 submarginal hooks and 1 pair of anchors, a common genital pore opening marginally immediately posterior to the left cephalic lobe, 2 testes juxtaposed near the body midlength, and by lacking cephalic suckers or adhesive discs, accessory haptoral sclerites, and a uterine valve. The new genus most closely resembles Entobdella, which differs from Calicobenedenia by having an aseptate haptor armed with 14 submarginal hooks, 2 pairs of anchors, and a pair of accessary sclerites. PMID:10219294

  9. Haliotrema abaddon n. sp. (Monogenoidea: Dactylogyridae) from the gills of wild and maricultured West Australian dhufish Glaucosoma hebraicum (teleostei: Glaucosomatidae), in Australia.

    Science.gov (United States)

    Kritsky, D C; Stephens, F

    2001-08-01

    Haliotrema abaddon n. sp. (Dactylogyridae) is described from the gills of West Australian dhufish Glaucosoma hebraicum (Teleostei: Glaucosomatidae), from the Indian Ocean near Fremantle, Western Australia. The parasite is recorded from cultured dhufish and from a major portion of the known geographic distribution of its host. In cultured dhufish, H. abaddon causes branchitis and hyperplasia and metaplasia of the lamellar epithelial cells and may be a limiting factor in the development of an economically feasible mariculture industry. Comparable prevalences and densities of the parasite on wild and cultured dhufish were observed. In heavily infested captive fish, clusters of eggs (egg strands) appear to restrict blood flow to localized regions of the gills as a result of entanglement of egg filaments with secondary gill lamellae. Hatching of oncomiracidia occurs in 7-10 days at 20-25 C. PMID:11534637

  10. 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

  11. Feeding of holoshesthes Heterodon eigenmann (Teleostei, Cheirodontinae of the cajuru reservoir (Minas Gerais, Brazil, in relation to the vegetal biomass on its depletion zone

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    Márcio Camilo Carvalho Alvim

    1998-12-01

    Full Text Available Stomach contents of Holoshesthes heterodon Eigenmann, 1915 (Teleostei, Cheirodontinae, collected in the depletion zone of Cajuru reservoir when it was at its maximum water level in two stations with different vegetal densities, were studied in order to investigate the influence of the flooded vegetal biomass on the food quantity and quality ingested by fish. Eighteen individuals from each station were examined. The standard length was l.53±0.05 cm and l.52±0.05 cm, respectively at the lower biomass (8.19 kg diy weight/ha and higher biomass (38.10 kg diy weight/ha sampling stations. The stomach repletion Index (SRI was applied for the quantitative analysis. The alimentary index (IAi was used for the quali-quantitative analysis, with the volume of the items obtained through the points method. SRI did not show values significatively different between the two stations, p>0.05, by applying the Mann-Whitney test. In both situations, Cladocera was the most important item. There were no correlation between the flooded vegetal biomass in the depletion zone and the intake of food by H. heterodon. However, as there were no empty stomachs, possibly even the lower vegetal biomass was enough to provide abundant feeding resources.

  12. Parasitic inventory of Balistes capriscus (Teleostei:Balistidae) from the Gulf of Gabès (Southern Tunisia, Central Mediterranean Sea)

    Institute of Scientific and Technical Information of China (English)

    Hichem Kacem; Lassad Neifar

    2015-01-01

    Objective:To investigate the parasitic inventory of Balistes capriscus (Teleostei:Balistidae) (B. capriscus) from the Gulf of Gabès (Southern Tunisia, Central Mediterranean Sea). Methods:A parasitological survey of the grey triggerfish B. capriscus (Gmelin, 1788) from the Gulf of Gabès (Southern Tunisia, Central Mediterranean Sea) was conducted monthly from May 2007 to April 2009. A total of 480 fishes were collected from commercial catches by pelagic trawl net at different fishing ports at Chebba (34°14' N, 11°06' E), Kerkennah (34°45' N, 11°17' E) and Zarzis (33°41' N, 11°48' E). The weight, the size, the sex, the date and the area of capture of each specimen were recorded. B. capriscus were then examined to search for ectoparasites and endoparasites. For each parasite species, parasitological indices were calculated. Results:Five species of parasites were identified, among which a new species of Digenea Hypocreadium caputvadum was discovered and two species of parasites were reported for the first time in the Mediterranean. Conclusions:It is the first inventory of the ecto and endoparasites of grey triggerfish collected from the Gulf of Gabès Mediterranean Sea.

  13. Diversification of substrate specificities in teleostei Fads2: characterization of Δ4 and Δ6Δ5 desaturases of Chirostoma estor.

    Science.gov (United States)

    Fonseca-Madrigal, Jorge; Navarro, Juan C; Hontoria, Francisco; Tocher, Douglas R; Martínez-Palacios, Carlos A; Monroig, Óscar

    2014-07-01

    Currently existing data show that the capability for long-chain PUFA (LC-PUFA) biosynthesis in teleost fish is more diverse than in other vertebrates. Such diversity has been primarily linked to the subfunctionalization that teleostei fatty acyl desaturase (Fads)2 desaturases have undergone during evolution. We previously showed that Chirostoma estor, one of the few representatives of freshwater atherinopsids, had the ability for LC-PUFA biosynthesis from C18 PUFA precursors, in agreement with this species having unusually high contents of DHA. The particular ancestry and pattern of LC-PUFA biosynthesis activity of C. estor make this species an excellent model for study to gain further insight into LC-PUFA biosynthetic abilities among teleosts. The present study aimed to characterize cDNA sequences encoding fatty acyl elongases and desaturases, key genes involved in the LC-PUFA biosynthesis. Results show that C. estor expresses an elongase of very long-chain FA (Elovl)5 elongase and two Fads2 desaturases displaying Δ4 and Δ6/Δ5 specificities, thus allowing us to conclude that these three genes cover all the enzymatic abilities required for LC-PUFA biosynthesis from C18 PUFA. In addition, the specificities of the C. estor Fads2 enabled us to propose potential evolutionary patterns and mechanisms for subfunctionalization of Fads2 among fish lineages. PMID:24792929

  14. Simultaneous analysis of five molecular markers provides a well-supported phylogenetic hypothesis for the living bony-tongue fishes (Osteoglossomorpha: Teleostei).

    Science.gov (United States)

    Lavoué, Sébastien; Sullivan, John P

    2004-10-01

    Fishes of the Superorder Osteoglossomorpha (the "bonytongues") constitute a morphologically heterogeneous group of basal teleosts, including highly derived subgroups such as African electric fishes, the African butterfly fish, and Old World knifefishes. Lack of consensus among hypotheses of osteoglossomorph relationships advanced during the past 30 years may be due in part to the difficulty of identifying shared derived characters among the morphologically differentiated extant families of this group. In this study, we present a novel phylogenetic hypothesis for this group, based on the analysis of more than 4000 characters from five molecular markers (the mitochondrial cytochrome b, 12S and 16S rRNA genes, and the nuclear genes RAG2 and MLL). Our taxonomic sampling includes one representative of each extant non-mormyrid osteoglossomorph genus, one representative for the monophyletic family Mormyridae, and four outgroup taxa within the basal Teleostei. Maximum parsimony analysis of combined and equally weighted characters from the five molecular markers and Bayesian analysis provide a single, well-supported, hypothesis of osteoglossomorph interrelationships and show the group to be monophyletic. The tree topology is the following: (Hiodon alosoides, (Pantodon buchholzi, (((Osteoglossum bicirrhosum, Scleropages sp.), (Arapaima gigas, Heterotis niloticus)), ((Gymnarchus niloticus, Ivindomyrus opdenboschi), ((Notopterus notopterus, Chitala ornata), (Xenomystus nigri, Papyrocranus afer)))))). We compare our results with previously published phylogenetic hypotheses based on morpho-anatomical data. Additionally, we explore the consequences of the long terminal branch length for the taxon Pantodon buchholzi in our phylogenetic reconstruction and we use the obtained phylogenetic tree to reconstruct the evolutionary history of electroreception in the Notopteroidei. PMID:15324846

  15. Ultrastructure and development of Nosema podocotyloidis n. sp. (Microsporidia, a hyperparasite of Podocotyloides magnatestis (Trematoda, a parasite of Parapristipoma octolineatum (Teleostei

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    Toguebaye Bhen Sikina

    2014-01-01

    Full Text Available Nosema podocotyloidis n. sp. (Microsporidia, Nosematidae is described from Podocotyloides magnatestis (Trematoda: Opecoelidae, a parasite of the fish Parapristipoma octolineatum (Teleostei in the Atlantic Ocean. Electron microscopy reveals that all the stages of the cycle (merogony and sporogony are diplokaryotic and in direct contact with the cytoplasm of host cells. There is no sporophorous vesicle (pansporoblast. The earliest stages observed are meronts, which have a simple plasmic membrane. Their cytoplasm is granular, rich in ribosomes and contains some sacculi of endoplasmic reticulum. They divide by binary fission into diplokaryotic sporonts. The sporonts have a thick electron-dense wall. Their diplokaryon is slightly less electron-dense than the cytoplasm. The cytoplasm of more advanced sporonts has numerous electron-lucent vesicles. Sporonts with two diplokarya divide by binary fission into diplokaryotic sporoblasts. The older sporoblasts are irregular or elongate and the polar filament is in formation. Their cytoplasm is denser, with ribosomes and lamellae of granular endoplasmic reticulum. The sporoblasts evolve into spores. The mature spores are broadly oval and measure 3.6 (3.1–4.0 × 2.58 (1.8–3.3 μm. Their wall is 100–300 nm thick. The polar tube is isofilar with 11–16 coils, 130–155 nm in diameter and arranged in many layers in the centre of the spore. The polaroplast is divided into two regions: an outer electron-dense cup with granular content and lacking lamellae and an internal region, less electron-dense, composed of irregularly arranged sacs. The posterior vacuole, with an amorphous electron-dense content, is present. The new species is compared with other species of Nosema from trematodes.

  16. Scale surface microstructure and scale size in the tooth-carp genus Aphanius (Teleostei, Cyprinodontidae) from endorheic basins in Southwest Iran.

    Science.gov (United States)

    Gholami, Zeinab; Teimori, Azad; Esmaeili, Hamid Reza; Schulz-Mirbach, Tanja; Reichenbacher, Bettina

    2013-01-01

    A substantial number of species within the tooth-carp Aphanius Nardo, 1827 (Cyprinodontidae, Teleostei) has been recorded from the endorheic drainage systems of Iran, and several isolated populations in these systems may deserve species status. Descriptions of these species and populations have been based mainly on morphological and molecular data; however, the characters related to the fish scales have not up to now been intensively studied and employed for the identification of the species belonging to this genus. The objective of this study is to test as to whether (i) scale surface morphology, (ii) scale surface microstructure, and (iii) scale size can be used to discriminate species and/or populations and, (iv) to discuss the possible causes of the observed differences. To achieve these objectives, scales of three species of the genus Aphanius from endorheic basins in SW Iran, viz. A. sophiae (nine populations from the Kor River Basin), A. farsicus (four populations from the Maharlu Lake Basin) and A. pluristriatus (a single population from the Mond River Basin) have been studied using SEM images, scale measurements, and uni- and multivariate statistics. It is opined that scale surface morphology and microstructure cannot help in distinguishing the species, but can be employed to discriminate certain populations of A. sophiae (those from Safashahr, Kharameh, Tashk, Gol). In addition, scale size and J-indices, respectively, represent a valuable tool for species separation, which corroborates earlier studies for the use of these indices in taxonomy. Major driving forces of the differentiation within A. sophiae probably include habitat fragmentation resulting from the geological history and local adaptations. Thus the differentiation results from a balance between both genetic and environmental effects. PMID:26131487

  17. Atividade de lipase em quimo de três espécies tropicais de peixes Teleostei de água doce

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    Seixas Filho José Teixeira

    2000-01-01

    Full Text Available RESUMO - O objetivo do presente trabalho foi avaliar a atividade de lipase no quimo dos intestinos médio e posterior de três espécies de peixes Teleostei, com hábitos alimentares diferentes, piracanjuba (Brycon orbignyanus, piau (Leporinus friderici, onívoros, e surubim (Pseudoplatystoma curuscans, preferencialmente carnívoro, visando fornecer referência à nutrição para o ajuste de diferentes sistemas de alimentação artificial. Foram determinadas as atividades de lipase, utilizando-se kit BIOCLIN. Os resultados demonstraram atividade específica média de lipase de 99,86%, sendo menor para a piracanjuba (1,89 UI/mg em relação ao piau (1347,82 UI/mg, ambos de hábito alimentar onívoro. A diferença de atividade específica de lipase entre piracanjuba e surubim (793,76 UI/mg também apresentou média de 99,76%. O surubim apresentou atividade específica de lipase 41,11% menor que o piau. Estes dados sugerem que o piau apresenta atividade específica de lipase mais próxima à de um peixe carnívoro que onívoro. Estudos adicionais com testes de alimentação são necessários para a avaliação do comportamento destas espécies a novos sistemas de alimentação.

  18. Catálogo dos Peixes Marinhos do Laboratório de Ictiologia da Universidade Federal do Rio de Janeiro. Parte I: Chondrichthyes (Rajiformes. Teleostei (Elopiformes a Dactylopteriformes

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    Paulo Roberto Duarte Lopes

    1989-01-01

    Full Text Available The present paper is the first part of the catalogue of marine fishes belonging to the collection of the Laboratory of Ichthyology (Universidade Federal do Rio de Janeiro-RJ to be published. Here are included Chondrichthyes (Rajiformes and part of Osteichthyes, Teleostei (Elopiformes to Dactylopteriformes in a total amount of 30 families, 52 genera and 62 species. The most part of the material have been collected at the littoral of the State of Rio de Janeiro. For each species considered is given the vulgar name (when known in Southeastern Brazil, the known distribution (in Western Atlantic Ocean and some data as collecting locality, total number of collected specimens and the register number in the collection. Scorpaena isthmensis Meek & Hildebrand, 1928 (Scorpaenidae is for the first time mentioned for the Southern littoral of Brazil.

  19. Gyrodactylus salinae n. sp. (Platyhelminthes: Monogenea infecting the south European toothcarp Aphanius fasciatus (Valenciennes (Teleostei, Cyprinodontidae from a hypersaline environment in Italy

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    Huyse Tine

    2011-06-01

    Full Text Available Abstract Background Historically, non-native species of Gambusia (Poeciliidae have been used to control larval stages of the Asian tiger mosquito, Stegomyia albopicta Reinert, Harbach et Kitching, 2004 throughout Italy. The potential utility of indigenous populations of Aphanius fasciatus (Valenciennes (Teleostei: Cyprinodontidae as an appropriate alternative biological control is currently being explored. A sub-sample of ten fish collected from Cervia Saline, Italy (salinity 65 ppt; 30°C to assess their reproductive capability in captivity, harboured a moderate infection of Gyrodactylus von Nordmann, 1832 (Platyhelminthes, Monogenea. A subsequent morphological and molecular study identified this as being a new species. Results Gyrodactylus salinae n. sp. is described from the skin, fins and gills of A. fasciatus. Light and scanning electron microscopical (SEM examination of the opisthaptoral armature and their comparison with all other recorded species suggested morphological similarities to Gyrodactylus rugiensoides Huyse et Volckaert, 2002 from Pomatoschistus minutus (Pallas. Features of the ventral bar, however, permit its discrimination from G. rugiensoides. Sequencing of the nuclear ribosomal DNA internal transcribed spacers 1 and 2 and the 5.8S rRNA gene and a comparison with all species listed in GenBank confirmed they are unique and represent a new species (most similar to Gyrodactylus anguillae Ergens, 1960, 8.3% pair-wise distance based on 5.8S+ITS2. This represents the first species of Gyrodactylus to be described from Aphanius and, to date, has the longest ITS1 (774 bp sequenced from any Gyrodactylus. Additional sampling of Cervia Saline throughout the year, found G. salinae n. sp. to persist in conditions ranging from 35 ppt and 5°C in December to 65 ppt and 30°C in July, while in captivity a low level of infection was present, even in freshwater conditions (0 ppt. Conclusions The ability of G. salinae n. sp. to tolerate a wide

  20. A specimen of Paralycoptera Chang & Chou 1977 (Teleostei: Osteoglossoidei from Hong Kong (China with a potential Late Jurassic age that extends the temporal and geographical range of the genus

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    Tze-Kei Tse

    2015-03-01

    Full Text Available We describe a Mesozoic fish Paralycoptera sp. (Teleostei: Osteoglossoidei, on the basis of a postcranial skeleton collected from the volcaniclastic mudstones of the Lai Chi Chong Formation of Hong Kong, China. The new finding—representing the city’s first Mesozoic fish—extends the geographical distribution of Paralycoptera from eastern mainland China into Hong Kong, demonstrating a wider distribution than previously appreciated for this genus. A radiometric age for the Lai Chi Chong Formation of 146.6 ± 0.2 Ma implies a temporal range expansion for Paralycoptera of approximately 40 million years back from the Early Cretaceous (∼110 Ma. However, spores found in the Formation suggest an Early Cretaceous age that is consistent with the existing age assignment to Paralycoptera. We argue that the proposed temporal range extension is genuine because it is based on recent high precision radiometric age data, but given the discrepancies with the biostratigraphic ages further investigation is needed to confirm this. This study provides an important step towards revealing Hong Kong’s Mesozoic vertebrate fauna and understanding its relationship to well-studied mainland Chinese ones.

  1. COMPARAÇÃO ENTRE OS MÉTODOS DE EXTRAÇÃO DE METACERCÁRIAS DE ASCOCOTYLE SP (TREMATODA: DIGENEA DOS TECIDOS DE MUGIL LIZA VALENCIENNES, 1836 (TELEOSTEI: MUGILIDAE

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    Renato Ribeiro Nogueira Ferraz

    2014-09-01

    Full Text Available The demand and consumption of fish and their derivatives has increased considerably in recent years. However, fish are ideal hosts of numerous parasites, highlighting the need to develop new research methodologies for its detection. The aim of present study was to compare the efficacy of Ascocotyle metacercariae (Trematoda: Digenea extraction from visceral tissues of Mugil liza Valenciennes, 1836 (Teleostei: Mugilidae by two methods: homogenization by blender or mixer. Twentysix samples of M. liza were collected, being 16 liver samples and 10 samples of muscle tissue. Approximately 5g of each sample were processed by blender and mixer techniques homogenization for metacercariae extraction. In liver samples, up to 46 metacercariae were found in samples homogenized in blender. The lowest amount found was 2 metacercariae for blender and mixer techniques. In samples of muscle tissue, 4 metacercariae were observed in the mixer extraction. The lowest amount was found to be 2 parasites to blender and mixer. The mean metacercariae found and extracted from muscle tissue were 0.2 (+0.357 and 1.2 (+0.963 for blender and mixer, respectively. The averages of metacercariae found and extracted from fish liver, in blender and mixer, were 24 (+15.145 and 18 (+8.246, respectively. The homogenization techniques for blender and mixer were effective for the extraction of metacercariae of mullet fish tissues, suggesting that they may be directly applicable in the field of study, especially due to the ease of testing.

  2. Determinação do sistema endócrino difuso nos intestinos de três Teleostei (Pisces de água doce com hábitos alimentares diferentes

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    Seixas Filho José Teixeira de

    2001-01-01

    Full Text Available O objetivo do presente trabalho foi o de verificar a presença de células endócrinas nos intestinos médio e posterior, ou reto, e nos cecos pilóricos de três espécies tropicais de peixes Teleostei de água doce com hábitos alimentares diferentes: piracanjuba, (Brycon orbignyanus e piau (Leporinus friderici, onívoro; e surubim (Pseudoplatystoma coruscans, carnívoro. Para tanto, foram utilizados sete exemplares da piracanjuba, com médias de peso e comprimento-padrão de 410,16 ± 66,33 g e 27,42 ± 1,17 cm, respectivamente, 13 exemplares de piau com médias de 77,71 ± 24,31 g e 14,84 ± 1,56 cm de peso e comprimento-padrão, respectivamente; e cinco exemplares do surubim com médias de peso e comprimento-padrão de 309,91 ± 94,23 g e 32,70 ± 1,79 cm, respectivamente. Pode-se constatar a presença de células endócrinas do "tipo aberto" nos segmentos referentes aos intestinos médio e posterior das espécies onívoras e do "tipo fechado" no intestino médio e no reto da espécie carnívora. As células argirófilas foram observadas entre as células absortivas do epitélio intestinal. Os resultados permitem concluir que a presença de células endócrinas nas espécies estudadas pode indicar que estas atuam no mecanismo de controle da absorção dos nutrientes do alimento.

  3. Ligophorus spp. (Monogenoidea: Dactylogyridae) parasitizing mullets (Teleostei: Mugiliformes: Mugilidae) occurring in the fresh and brackish waters of the Shatt Al-Arab River and Estuary in southern Iraq, with the description of Ligophorus sagmarius sp. n. from the greenback mullet Chelon subviridis (Valenciennes).

    Science.gov (United States)

    Kritsky, Delane C; Khamees, Najim R; Ali, Atheer H

    2013-12-01

    The gills of three of five species of mullets (Teleostei: Mugiliformes: Mugilidae) collected from the brackish and fresh waters of southern Iraq were infected with species of Ligophorus (Monogenoidea: Dactylogyridae) as follows: greenback mullet Chelon subviridis (Valenciennes) infected with Ligophorus lebedevi Dmitrieva, Gerasev, Gibson, Pronkina and Galli, 2012, Ligophorus bantingensis Soo and Lim, 2012, Ligophorus sagmarius n. sp., and Ligophorus fluviatilis (Bychowsky, 1949) Dmitrieva, Gerasev, Gibson, Pronkina, and Galli, 2012; Klunzinger’s mullet Liza klunzingeri (Day) with L. bantingensis, L. fluviatilis, and an apparently undescribed species of Ligophorus; and abu mullet Liza abu (Heckel) with L. bantingensis and L. fluviatilis. The keeled mullet Liza carinata (Valenciennes) and Speigler’s mullet Valamugil speigleri (Bleeker) were uninfected. L. sagmarius n. sp. is described, and L. lebedevi and L. bantingensis are redescribed. Available specimens of L. fluviatilis and the undescribed species of Ligophorus from Klunzinger’s mullet were insufficient for description. PMID:24022128

  4. Nematode parasites infecting the starry batfish Halieutaea stellata (Vahl) (Lophiiformes: Ogcocephalidae) from the East and South China Sea.

    Science.gov (United States)

    Li, L; Zhao, W-T; Guo, Y-N; Zhang, L-P

    2016-05-01

    The starry batfish Halieutaea stellata (Vahl) is a small, benthic fish found in Indo-West Pacific Oceans. However, our present knowledge of the helminth parasites of this fish is still fragmentary. In this study, a total of 29 fish collected from the East and South China Sea were examined to determine the prevalence, intensity and species composition of helminth parasites in H. stellata. Using morphological and molecular approaches, four species of nematodes were found parasitic in this fish host, including the adults and fourth-stage larvae of Raphidascaroides nipponensis Yamaguti 1941; adults and third-stage larvae of Raphidascaris lophii (Wu 1949), third- and fourth-stage larvae of Hysterothylacium larval type IV-A of Shamsi, Gasser & Beveridge 2013 and third-stage larvae of Hysterothylacium amoyense (Hsü 1993). Halieutaea stellata represents a new host record for the three last-named nematodes. Raphidascaroides nipponensis with the highest prevalence (82.5%) and intensity (mean = 13.5) of infection was considered as the dominant parasite species in H. stellata. The detailed morphology of the different developmental stages of the four nematode species was studied using light and scanning electron microscopy. All nematode species were also genetically characterized by sequencing and analysing the internal transcribed spacer (ITS) of the ribosomal DNA. This study provides further data on the occurrence of nematode parasites in H. stellata and also contributes to facilitate an accurate and rapid diagnosis of the infection by these little-known nematodes. PMID:25917527

  5. Phylogeny of the snailfishes (Teleostei

    DEFF Research Database (Denmark)

    Knudsen, Steen Wilhelm; Møller, P. R.; Gravlund, P.

    2007-01-01

    Liparidae (snailfishes) is one of the most diverse and abundant fish families in polar and deep-sea habitats. However, the evolution of this family is poorly known because of the rarity of many species and difficulties in scoring morphological characters. We perform phylogenetic analyses of Lipar...

  6. Phylogeny of the gudgeons (Teleostei: Cyprinidae: Gobioninae).

    Science.gov (United States)

    Tang, Kevin L; Agnew, Mary K; Chen, Wei-Jen; Vincent Hirt, M; Raley, Morgan E; Sado, Tetsuya; Schneider, Leah M; Yang, Lei; Bart, Henry L; He, Shunping; Liu, Huanzhang; Miya, Masaki; Saitoh, Kenji; Simons, Andrew M; Wood, Robert M; Mayden, Richard L

    2011-10-01

    The members of the cyprinid subfamily Gobioninae, commonly called gudgeons, form one of the most well-established assemblages in the family Cyprinidae. The subfamily is a species-rich group of fishes, these fishes display diverse life histories, appearances, and behavior. The phylogenetic relationships of Gobioninae are examined using sequence data from four loci: cytochrome b, cytochrome c oxidase I, opsin, and recombination activating gene 1. This investigation produced a data matrix of 4114 bp for 162 taxa that was analyzed using parsimony, maximum likelihood, and Bayesian inference methods. The phylogenies our analyses recovered corroborate recent studies on the group. The subfamily Gobioninae is monophyletic and composed of three major lineages. We find evidence for a Hemibarbus-Squalidus group, and the tribes Gobionini and Sarcocheilichthyini, with the Hemibarbus-Squalidus group sister to a clade of Gobionini-Sarcocheilichthyini. The Hemibarbus-Squalidus group includes those two genera; the tribe Sarcocheilichthyini includes Coreius, Coreoleuciscus, Gnathopogon, Gobiocypris, Ladislavia, Paracanthobrama, Pseudorasbora, Pseudopungtungia, Pungtungia, Rhinogobio, and Sarcocheilichthys; the tribe Gobionini includes Abbottina, Biwia, Gobio, Gobiobotia, Huigobio, Microphysogobio, Platysmacheilus, Pseudogobio, Romanogobio, Saurogobio, and Xenophysogobio. The monotypic Acanthogobio is placed into the synonymy of Gobio. We tentatively assign Belligobio to the Hemibarbus-Squalidus group and Mesogobio to Gobionini; Paraleucogobio and Parasqualidus remain incertae sedis. Based on the topologies presented, the evolution of swim bladder specializations, a distinctive feature among cyprinids, has occurred more than once within the subfamily. PMID:21672635

  7. Biologia do jundiá Rhamdia quelen (Teleostei, Pimelodidae) Biology of Rhamdia quelen (Teleostei, Pemelodidae)

    OpenAIRE

    Levy de Carvalho Gomes; Jaqueline Ineu Golombieski; Adriana Regina Chippari Gomes; Bernardo Baldisserotto

    2000-01-01

    O jundiá, Rhamdia quelen, é encontrado desde o centro da Argentina até o sul do México, e seu cultivo está aumentando no sul do Brasil. Portanto, o objetivo desta revisão é apresentar os dados existentes até o momento sobre a biologia dessa espécie. R. quelen pode atingir 50cm de comprimento e 3kg de peso, possui hábito noturno e habita locais calmos e profundos dos rios. Os alevinos suportam água do mar a 10%o, até 9,0g/l de sal comum e pH na faixa de 4,0 a 8,5, com melhor crescimento das la...

  8. Biologia do jundiá Rhamdia quelen (Teleostei, Pimelodidae Biology of Rhamdia quelen (Teleostei, Pemelodidae

    Directory of Open Access Journals (Sweden)

    Levy de Carvalho Gomes

    2000-03-01

    Full Text Available O jundiá, Rhamdia quelen, é encontrado desde o centro da Argentina até o sul do México, e seu cultivo está aumentando no sul do Brasil. Portanto, o objetivo desta revisão é apresentar os dados existentes até o momento sobre a biologia dessa espécie. R. quelen pode atingir 50cm de comprimento e 3kg de peso, possui hábito noturno e habita locais calmos e profundos dos rios. Os alevinos suportam água do mar a 10%o, até 9,0g/l de sal comum e pH na faixa de 4,0 a 8,5, com melhor crescimento das larvas na faixa de pH de 8,0 a 8,5. É uma espécie euritérmica. Esse peixe é omnívoro, com tendência piscívora. A maturidade sexual é atingida no primeiro ano de vida. É uma espécie ovulípara e, na natureza, os cardumes desovam em locais com água limpa, calma e de fundo pedregoso. Não apresenta cuidado parental. Possui dois picos reprodutivos por ano (um no verão e outro na primavera e desova múltipla. A indução da desova apresentou bons resultados com gonadotrofina coriônica humana (HCG ou extrato hipofisário. O desenvolvimento embrionário de R. quelen é rápido e se dá entre 3 a 5 dias. O melhor alimento artificial para larvas de R. quelen é baseado em lecitina de soja, fígado bovino e levedura. Várias bactérias patogênicas e trematódeos digenéticos já foram identificados em R. quelen. Para um melhor aproveitamento dessa espécie na piscicultura, são necessários mais estudos relacionados ao efeito de parâmetros físicoquímicos da água, alimentação artificial e crescimento em cativeiro.The jundiá, Rhamdia quelen, occurs from Southern Mexico to Central Argentina, and the husbandry of this species is spreading in Southern Brazil. Consequently, the aim of this review is to present the available data of the biology of this species. R. quelen can reach 50cm of length and 3kg of weight, presents a nocturnal habit and lives in placid and deep waters of the rivers. Fingerlings support 10‰ seawater, up to 9g/l table salt and 4.0 - 8.5 pH range, with best growth at 8.0 - 8.5 pH range. It is an eurytermal species. This fish is omnivorous, but prefers fish. The sexual maturity is reached in the first year of life, and it is ovuliparous and in the natural environment the schools spawn in clean and calm waters with rocky bottom. There is no parental care. This species shows two reproductive peaks/year (spring and summer and multiple spawning. The induced spawning had good results with human chorionic gonadotrofin (HCG or pituitary extract. The embriological development of R. quelen is fast, and the larval development occurs in three to five days. The best feeding ration to the larvae of R. quelen is based on soybean lecithin, cattle liver and yeast. Several pathogenic bacteria and digenetic trematoda were identified in R. quelen. To improve the use of this species in fish culture, additional studies about physico-chemical parameters of the water, feeding rations and growth in captivity are essential.

  9. Interspecific chromosomal divergences in the genus Characidium (Teleostei: Characiformes: Crenuchidae

    Directory of Open Access Journals (Sweden)

    José Carlos Pansonato Alves

    2010-03-01

    Full Text Available Karyotypes of seven fish species of the genus Characidium, three of them studied for the first time, were characterized using conventional cytogenetic techniques (Giemsa staining, Ag-NOR, and C-banding. All species presented a diploid number of 2n=50, with only metacentric and submetacentric chromosomes, as observed in all Characidium species studied. In two species cells with one to three B chromosomes were observed. All species analyzed have a single NOR-bearing chromosome pair with morphological differences among them. Characidium cf. zebra shows heterochromatic blocks restricted to the pericentromeric regions of all chromosomes denoting the absence of a sex chromosome system. On the other hand, the species Characidium lanei, C. pterostictum, C. lauroi, C. oiticicai, C. schubarti, and Characidium sp., besides presenting pericentromeric heterochromatic blocks, exhibited large interstitial and/or terminal heterochromatic blocks, and a ZZ/ZW sex chromosome system. The constitutive heterochromatin seems to play a relevant role in the chromosome differentiation process of the studied species, mainly in relation to the sex chromosomes. The geographical isolation of the rivers in which the species were sampled, associated with their way of life restricted to headwaters environments, may have favored the process of fixation of different karyotypes found in each of the analyzed species.Os cariótipos de sete espécies de peixes do gênero Characidium, três estudadas pela primeira vez, foram caracterizados com o uso das técnicas citogenéticas convencionais (Giemsa, Ag-RONs e bandamento-C. Todas as espécies apresentaram número diplóide de 2n=50 cromossomos, com predominância de cromossomos dos tipos meta e submetacêntricos. Nesse estudo foi também observada a presença de até três cromossomos B em células de duas espécies, C. oiticicai e C. pterostictum. O bandamento C e o tratamento com nitrato de prata revelaram significativas diferenças nos cariótipos das espécies analisadas. A espécie Characidium cf. zebra apresenta heterocromatina restrita às regiões pericentroméricas dos cromossomos e ausência de heteromorfismos cromossômicos relacionados à diferenciação sexual, enquanto as espécies Characidium lanei, C. pterostictum, lauroi, C. oiticicai, C. schubarti e Characidium sp., evidenciaram, além de blocos pericentroméricos também observados em Characidium cf. zebra, grandes blocos heterocromáticos intersticiais e/ou terminais e sistema cromossômico de diferenciação sexual do tipo ZZ-ZW. A heterocromatina constitutiva parece exercer papel relevante no processo de diferenciação cromossômica destas espécies, principalmente em relação à diferenciação de cromossomos sexuais. O isolamento geográfico dos rios em que essas espécies foram amostradas, bem como o seu modo de vida restrito às regiões de cabeceira, podem ter favorecido o processo de diferenciação cromossômica e a fixação dos cariótipos particulares encontrados em cada uma das espécies analisadas.

  10. The complete mitochondrial genome of Polydactylus sextarius (Teleostei, Mugiliformes).

    Science.gov (United States)

    Wang, Chengyi; Qiu, Jianbiao; Peng, Xin; Ai, Weiming; Huang, Xiaolin; Liu, Weicheng; Chen, Shaobo

    2016-09-01

    The complete mitogenome of Polydactylus sextarius was firstly determined in this study using a long polymerase chain reaction (PCR) method and genome walking. It is 16,836 bp in length and has 13 protein-coding genes, 2 rRNA genes, 22 tRNA genes and 1 control region. The genes composition and order of which are similar to most other vertebrates. All mitochondrial genes are encoded on the heavy strand, except for eight tRNA and ND6 genes. The overall base composition of the heavy strand is 27.4% A, 26.0% T, 29.9% C, and 16.7% G, with a slight AT bias of 53.4%. There are eight regions of gene overlap totaling 27 bp and 16 intergenic spacer regions totaling 344 bp. The mitogenome sequence of P. sextarius could contribute to the solution of its phylogenetic position within Polynemidae fishes based on the whole mitogenomic data. PMID:25714147

  11. The complete mitochondrial genome of the Epinephelus polyphekadion (Teleostei, Serranidae).

    Science.gov (United States)

    Zhang, Guoqing; Chen, Mengmeng; Luo, Jian; Chen, Guohua

    2016-07-01

    In this study, the complete mitochondrial genome of the Epinephelus polyphekadion has been sequenced by the next-generation sequencing (NGS) techniques strategy. The mitochondrial genome is 16,691 bp in length and consists of 13 protein-coding genes, 2 rRNA genes, 22 tRNA genes and a control region. The nucleotide compositions of the light strand are 27.90% A, 29.05% T, 27.48% G and 15.58% C. With the exception of ND6 and eight tRNA genes, all other mitochondrial genes are encoded on the heavy-strand (H-strand). All the tRNAs have clover secondary structure with conservative anticodon arm, TΨC arm and D arm except for tRNA-Ser(GCT) and tRNA-Pro(TGG), which D arm consists of 13 bp and 7 bp single-base, respectively. Phylogenetic tree showed that E. latifasciatus, E. polyphekadion, E. epistictus, E. akaara and E. stictus of the Epinephelus formed a monophyletic group, whereas E. latifasciatus, E. polyphekadion and E. epistictus formed a sister group. PMID:26061342

  12. The complete mitochondrial genome of Schizopygopsis pylzovi (Teleostei, Cyprinidae, Schizopygopsis).

    Science.gov (United States)

    Lai, Jiansheng; Liu, Ya; Chen, Yeyu; Li, Hua; Du, Jun; Li, Lianman

    2016-09-01

    Schizopygopsis pylzovi, an endemic species in the Qinghai-Tibetan Plateau, has a unique ability to adapt to the extreme ecological condition of the plateau. In this study, we successfully sequenced the first mitochondrial genome of S. pylzovi. The mitogenome is 16,814 bp in length, containing 13 protein-coding genes, 2 rRNA genes, 22 tRNA genes and a control region (D-loop). The overall base composition of the heavy strand (H-strand) is 28.3% A, 26.1% C, 18.6% G, and 27.0% T, with a slight AT bias of 55.3%. Most of the genes are encoded on H-strand, except for eight tRNAs (tRNA(Gln), tRNA(Ala), tRNA(Asn), tRNA(Cys), tRNA(Tyr), tRNA(Ser), tRNA(Glu) and tRNA(Pro)) and ND6 genes. PMID:25690050

  13. The complete mitochondrial genome of Hemiculterella sauvagei (Teleostei, Cyprinidae, Hemiculterella).

    Science.gov (United States)

    He, Bin; Chen, Yeyu; Liu, Ya; Du, Jun; Deng, Xiaochuan

    2016-09-01

    Hemiculterella sauvagei, a Chinese minnow endemic to the upper Yangtze River, is an important part of the aquatic ecosystem and plays a vital ecological role in maintaining aquatic biodiversity. In this study, we provide the first mitochondrial genome of H. sauvagei. The complete mitochondrial genome of H. sauvagei is 16618 bp in length, containing 13 protein-coding genes, two rRNA genes (12 S and 16 S rRNA), 22 tRNA genes and a non-coding control region (D-loop). The gene nucleotide composition of H. sauvagei is A = 29.9%, T = 27.0%, C = 17.4% and G = 25.6%, with a slight AT bias of 56.9%. The complete mitochondrial genome of H. sauvagei would be useful for further studies on genetic diversity and molecular phylogenetic relationship of the subfamily Cultrinae. PMID:25693700

  14. Rediscovery of Sewellia lineolata in Annam, Viet Nam (Teleostei: Balitoridae)

    NARCIS (Netherlands)

    Kottelat, M.

    1994-01-01

    Sewellia lineolata is recorded for the first time since its original description (in 1846) based on specimens without precise locality data. It occurs on the eastern slope of the Annam mountain range of Viet Nam, near Hue. The preoral groove communicating with the mooth described by earlier authors

  15. Careproctus kidoi, a new Arctic species of snailfish (Teleostei

    DEFF Research Database (Denmark)

    Knudsen, Steen Wilhelm; Møller, Peter Rask

    2008-01-01

    Careproctus kidoi sp. nov. is described from the Baffin Bay between Greenland and Canada, in the northern most part of the western North Atlantic. During a series of bottom trawl surveys conducted in 1988-2004, 22 specimens of an undescribed species of Careproctus were caught at depths between 95...... dark brown, stomach dusky to dark brown, peritoneum black. It is generally found in deeper waters than the sympatric C. reinhardti. © 2008 The Ichthyological Society of Japan....

  16. New microsatellites primers for plaice, Pleuronectes platessa L. (Teleostei : Pleuronectidae)

    NARCIS (Netherlands)

    Hoarau, G; Cook, D; Stam, WT; Olsen, JL

    2002-01-01

    Seven microsatellite loci were developed for Pleuronectes platessa, a commercially important flatfish found throughout northern European waters. The number of alleles per locus ranged from 11 to 33 and heterozygosities from 0.74 to 0.96. Cross-reactivity was tested against six other flatfish species

  17. Molecular phylogenetics of the Neotropical fish family Prochilodontidae (Teleostei: Characiformes).

    Science.gov (United States)

    Melo, Bruno F; Sidlauskas, Brian L; Hoekzema, Kendra; Frable, Benjamin W; Vari, Richard P; Oliveira, Claudio

    2016-09-01

    Migratory detritivores of the characiform family Prochilodontidae occur throughout the freshwaters of much of South America. Prochilodontids often form massive populations and many species achieve substantial body sizes; a combination that makes them one of the most commercially important fish groups on the continent. Their economic significance notwithstanding, prochilodontids have never been the subject of a comprehensive molecular phylogenetic analysis. Using three mitochondrial and three nuclear loci spanning all prochilodontid species, we generated a novel phylogenetic hypothesis for the family. Our results strongly support monophyly of the family and the three included genera. A novel, highly supported placement of Ichthyoelephas sister to the clade containing Prochilodus and Semaprochilodus diverges from a previous morphological hypothesis. Most previously hypothesized interspecific relationships are corroborated and some longstanding polytomies within Prochilodus and Semaprochilodus are resolved. The morphologically similar P. brevis, P. lacustris, P. nigricans and P. rubrotaeniatus are embedded within what is herein designated as the P. nigricans group. Species limits and distributions of these species are problematic and the group clearly merits taxonomic revision. PMID:27262428

  18. Phylogenetic placement of enigmatic percomorph families (Teleostei: Percomorphaceae).

    Science.gov (United States)

    Sanciangco, Millicent D; Carpenter, Kent E; Betancur-R, Ricardo

    2016-01-01

    Percomorphs are a large and diverse group of spiny-finned fishes that have come to be known as the "bush at the top" due to their persistent lack of phylogenetic resolution. Recently, the broader Euteleost Tree of Life project (EToL) inferred a well-supported phylogenetic hypothesis that groups the diversity of percomorphs into nine well-supported series (supraordinal groups): Ophidiaria, Batrachoidaria, Gobiaria, Syngnatharia, Pelagiaria, Anabantaria, Carangaria, Ovalentaria, and Eupercaria. The EToL also provided, for the first time, a monophyletic definition of Perciformes - the largest order of vertebrates. Despite significant progress made in accommodating the diversity of percomorph taxa into major clades, some 62 families (most previously placed in "Perciformes", as traditionally defined) were not examined by the EToL. Here, we provide evidence for the phylogenetic affinities of 10 of those 62 families, seven of which have largely remained enigmatic. This expanded taxonomic sampling also provides further support for the nine EToL supraordinal series. We examined sequences from 21 genes previously used by the EToL and added two fast-evolving mitochondrial markers in an attempt to increase resolution within the rapid percomorph radiations. We restricted the taxonomic sampling to 1229 percomorph species, including expanded sampling from recent studies. Results of maximum likelihood analysis revealed that bathyclupeids (Bathyclupeidae), galjoen fishes (Dichistiidae), kelpfishes (Chironemidae), marblefishes (Aplodactylidae), trumpeters (Latridae), barbeled grunters (Hapalogenyidae), slopefishes (Symphysanodontidae), and picarel porgies (formerly Centracanthidae) are members of the series Eupercaria ("new bush at the top"). The picarel porgies and porgies (Sparidae) are now placed in the same family (Sparidae). Our analyses suggest a close affinity between the orders Spariformes (including Lethrinidae, Nemipteridae and Sparidae) and Lobotiformes (including the tripletails or Lobotidae, the barbeled grunters, and tigerperches or Datnioididae), albeit support for this group is low. None of the newly examined families belong in the order Perciformes, as recently defined. Finally, we confirm results from other recent studies that place the Australasian salmons (Arripidae) within Pelagiaria, and the false trevallies (Lactariidae) close to flatfishes, jacks, and trevallies, within Carangaria. PMID:26493227

  19. Vergleichende Untersuchungen an der Netzhaut von Atheriniformes (Teleostei)

    OpenAIRE

    Reckel, Frank

    2001-01-01

    Die vorliegende Arbeit stellt eine vergleichende –anatomische und physiologische- Untersuchung an der Netzhaut von Atheriniformes (Hornhechte, fliegende Fische, Halbschnäbler, Ährenfische, Zwischenkärpflinge, u. a.) dar. Ziel dieser Studie ist es, unter Berücksichtigung der verwandtschaftlichen Verhältnisse zu klären, inwieweit sich in Morphologie und spektraler Empfindlichkeit der äußeren Retina Anpassungen an die visuelle Umwelt zeigen. 13 Arten aus 8 Familien wurden licht- u...

  20. Microcobitis, a new genus name for Cobitis misgurnoides (Teleostei: Cobitidae)

    Czech Academy of Sciences Publication Activity Database

    Bohlen, Jörg; Harant, R.

    2010-01-01

    Roč. 21, č. 4 (2010), s. 295-300. ISSN 0936-9902 R&D Projects: GA ČR GA206/08/0637; GA ČR GA206/05/2556; GA AV ČR IAA600450508 Institutional research plan: CEZ:AV0Z50450515 Keywords : cypriniformes * fish * guangxi Subject RIV: EG - Zoology Impact factor: 0.828, year: 2010

  1. Eviota piperata, a new gobiid species from Palau (Teleostei: Gobiidae).

    Science.gov (United States)

    Greenfield, David W; Winterbottom, Richard

    2014-01-01

    A new species of dwarfgoby, Eviota piperata is described from Palau. It belongs to the cephalic sensory-pore system Group II (lacking only the IT pore); has a dorsal/anal-fin formula of 8/8; has some pectoral-fin rays branched; no dark spot over the ural centrum; the male genital papilla is not fimbriate; and the cheek and body are heavily peppered with chromatophores. PMID:24869823

  2. Extracting clades from the "Loach Bush": Botiidae (Teleostei:Cobitoidea)

    Czech Academy of Sciences Publication Activity Database

    Šlechtová, Vendula; Bohlen, Jörg; Freyhof, J.

    Tallinn: Estonian marine institute, 2004. s. 111-112. ISBN 9985-4-0396-7. [European Congress of Ichthyology /11./. 06.09.2004-10.09.2004, Tallinn] R&D Projects: GA AV ČR IAA6045405 Keywords : loach bush Subject RIV: EB - Genetics ; Molecular Biology

  3. Spawning marks in spined loaches (Cobitis taenia; Cobitidae; Teleostei)

    Czech Academy of Sciences Publication Activity Database

    Bohlen, Jörg

    2008-01-01

    Roč. 57, 1-2 (2008), s. 168-171. ISSN 0139-7893. [International Conference Loaches of the genus Cobitis and related genera. Šibenik, 24.09.2006-29.09.2006] R&D Projects: GA ČR GA206/05/2556; GA AV ČR IAA600450508 Institutional research plan: CEZ:AV0Z50450515 Keywords : freshwater fish * reproduction * autecology Subject RIV: EG - Zoology Impact factor: 0.522, year: 2008

  4. The complete mitochondrial genome of Gobiobotia filifer (Teleostei, Cypriniformes: Cyprinidae).

    Science.gov (United States)

    Li, Qiang; Liu, Ya; Zhou, Jian; Gong, Quan; Li, Hua; Lai, Jiansheng; Li, Lianman

    2016-09-01

    The Gobiobotia filifer is a small economic fish which distributes in the upstream of Yangtze River and its distributaries. For the environmental pollution and overfishing, its population declined drastically in recent decades, so it is essential to protect its resource. In this study, the complete mitochondrial genome sequence of G. filifer was determined with PCR technology, which contains 13 protein-coding genes, 22 tRNA genes, two rRNA genes, and a non-coding control region with the total length of 16,613 bp. The order and composition of genes were similar to most of the other teleost fish. Most of the genes were encoded on heavy strand, except for ND6 genes and eight tRNAs. Just like most other vertebrates, the bias of G and C has been found in different genes/regions. The complete mitochondrial genome sequence of G. filifer would contribute to better understand evolution of this lineage, population genetics, and will help administrative department to make rules and laws to protect this lineage. PMID:25806579

  5. Karyotype description of five species of Trichomycterus (Teleostei: Siluriformes: Trichomycteridae

    Directory of Open Access Journals (Sweden)

    Sato Luciana Ramos

    2004-01-01

    Full Text Available Trichomycteridae is a family of small catfish which are widely distributed throughout Southern Central America and South America. The present study showed that the cis-Andean species Trichomycterus florensis, Trichomycterus sp. aff. Trichomycterus itatiyae, Trichomycterus reinhardti, Trichomycterus davisi and Trichomycterus auroguttatus had 2n = 54 chromosomes (42 metacentric, 10 submetacentric and 2 subtelocentric, with T. reinhardti, T. auroguttatus and T. sp. aff. T. itatiyae exhibiting only one chromosome pair with silver-stained nucleolus organizer regions (NORs. The cytogenetic data suggest the existence of at least two groups of species in the cis-Andean representatives of the genus Trichomycterus. In the first group the first metacentric pair is considerably larger than the second metacentric pair and the NORs occur in the pericentromeric position of the short arm of a large submetacentric pair while in the second group the first and second metacentric pairs are about the same size and larger than the other metacentric pairs and the NORs are located in the pericentromeric position of the long arm of a large metacentric pair. The relative conservatism of the karyotype of the cis-Andean Trichomycterus species contrasts with the wide diversification observed in the trans-Andean species, reinforcing the hypothesis that the genus is not monophyletic.

  6. Primer registro de Synbranchiformes (Teleostei para el Holoceno temprano de Argentina First record of Symbranchiformes (Teleostei from the early Holocene of Argentina

    Directory of Open Access Journals (Sweden)

    Sergio Bogan

    2012-06-01

    Full Text Available En este trabajo se presentan y describen los restos óseos de peces Synbranchidae cf. Synbranchus recuperados en los niveles fosilíferos de la Formación Río Bermejo de la localidad de Mansilla, sudeste de la provincia de Formosa, Argentina. Estos materiales constituyen los únicos restos de peces recuperados en dicha localidad y fueron hallados asociados a mamíferos fósiles característicos de finales del Pleistoceno y comienzos del Holoceno. Hasta el presente solo se conocen escasos restos fósiles de sinbránquidos en América del Sur. Los restos más antiguos corresponden a la parte más baja del Pleistoceno Superior ("Belgranense" de la región Pampeana de Buenos Aires. Los materiales de la Formación Río Bermejo representan el primer registro fósil conocido de un Synbranchidae cf. Synbranchus para el Holoceno temprano.In this contribution we present and describe the remains of the bony fish cf. Synbranchus, exhumed from fossiliferous levels of the Río Bermejo Formation, Mansilla, southeastern Formosa province, Argentina. These materials constitute the only fish remains exhumed in this area, and they were found in association with extinct mammals which are characteristic of the Late Pleistocene and Early Holocene. Until now, only few fossil remains of Synbranchidae were known in South America. The earliest records come from the lowermost section of the Upper Pleistocene ("Belgranense" from the Pampean region, Buenos Aires, Argentina. The materials coming from the Rio Bermejo Formation represent the first fossil record of a Synbranchidae cf. Synbranchus from the Early Holocene.

  7. Primer registro de Synbranchiformes (Teleostei) para el Holoceno temprano de Argentina First record of Symbranchiformes (Teleostei) from the early Holocene of Argentina

    OpenAIRE

    Sergio Bogan; Alfredo E. Zurita; Ángel R. Miño-Boilini; Paola Suárez; Juan Friedrichs; Alicia I Lutz; José Friedrichs

    2012-01-01

    En este trabajo se presentan y describen los restos óseos de peces Synbranchidae cf. Synbranchus recuperados en los niveles fosilíferos de la Formación Río Bermejo de la localidad de Mansilla, sudeste de la provincia de Formosa, Argentina. Estos materiales constituyen los únicos restos de peces recuperados en dicha localidad y fueron hallados asociados a mamíferos fósiles característicos de finales del Pleistoceno y comienzos del Holoceno. Hasta el presente solo se conocen escasos restos fósi...

  8. A survey of nematodes of the genus Cucullanus Müller, 1777 (Nematoda, Seuratoidea) parasitic in marine fishes off Brazil, including description of three new species

    Czech Academy of Sciences Publication Activity Database

    Vieira, F.M.; Pereira, F.B.; Pantoja, C.; Soares, I.A.; Pereira, A.N.; Timi, J.T.; Scholz, Tomáš; Luque, J.L.

    2015-01-01

    Roč. 4039, č. 2 (2015), s. 289-311. ISSN 1175-5326 R&D Projects: GA ČR GBP505/12/G112 Institutional support: RVO:60077344 Keywords : new species * Cucullanidae * parasites * Lophiiformes * Perciformes * Gadiformes * Anguilliformes * Ophidiiformes Subject RIV: EG - Zoology Impact factor: 0.906, year: 2014

  9. The first molecular phylogeny of Chilodontidae (Teleostei: Ostariophysi: Characiformes) reveals cryptic biodiversity and taxonomic uncertainty.

    Science.gov (United States)

    Melo, Bruno F; Sidlauskas, Brian L; Hoekzema, Kendra; Vari, Richard P; Oliveira, Claudio

    2014-01-01

    Chilodontidae is a small family of eight described characiform species popularly known as headstanders. These small to moderately sized fishes are well known to aquarists, who prize their striking spotted pigmentation and unusual behaviors, and to systematists, who have revised both chilodontid genera in recent memory and studied their phylogenetic relationships using a comprehensive morphological dataset. However, no molecular phylogeny for the family has ever been proposed. Here, we reconstruct phylogenetic relationships for all eight known chilodontid species using three mitochondrial and two nuclear loci. Results largely agree with the previous morphological hypothesis, and confirm the monophyly of the family as well as its included genera, Caenotropus and Chilodus. The molecular topology differs slightly from the morphological hypothesis by placing Caenotropus maculosus rather than C. mestomorgmatos as the sister to the remaining three congeners, and by reconstructing the Curimatidae as the closest outgroup family, rather than the Anostomidae. However, the topologies supported by the morphological data were only slightly less likely and could not be rejected via Shimodaira-Hasegawa tests. Within Chilodus, two described species with distinctive pigmentation (C. fritillus and C. zunevei) appear embedded within the broad distributed C. punctatus clade, suggesting the presence of cryptic taxa with polymorphic pigmentation within the present concept of C. punctatus. Future work should combine morphological and molecular data to revisit the taxonomy and systematics of Chilodus and determine species limits within the C. punctatus-group sensu lato. PMID:24120449

  10. Nuclear DNA content determination in Characiformes fish (Teleostei, Ostariophysi from the Neotropical region

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    Carvalho Margarida Lima

    2002-01-01

    Full Text Available In the present study, nuclear DNA content was analyzed in 53 species of Characiformes fish from the Neotropical region. Diploid number ranged from 2n = 48 in Astyanax fasciatus, Gymnocorymbus ternetzi and Hyphessobrycon griemi to 2n = 102 in Potamorhina squamoralevis, with a modal number of 54 chromosomes. Nuclear DNA content ranged from 1.70 ± 0.04 pg of DNA per diploid nucleus in Acestrorhynchus pantaneiro to 3.94 ± 0.09 pg in Tetragonopterus chalceus. A general analysis showed a mean value of 2.9 pg of DNA per diploid nucleus. Very similar DNA content values were observed in the species of the family Cynodontidae which showed a variation of 3% between the two genera studied. Small variations were observed between populations of Gymnocorymbus ternetzi, Astyanax fasciatus and Moenkhausia sanctaefilomenae (Characidae, Tetragonopterinae. The subfamilies Tetragonopterinae and Acestrorhynchinae (Characidae presented the widest range, about 96%. Even in those families in which diploid number and karyotypic formulae were conserved such as the families Anostomidae, Curimatidae, and Prochilodontidae, episodes leading to losses or gains of genetic material became fixed in their evolutionary history.

  11. Phylogenetic position of Scombropidae within teleostei: the complete mitochondrial genome of the gnomefish, Scombrops gilberti.

    Science.gov (United States)

    Tsunashima, Tadasuke; Yamada, Riko; Abe, Koko; Noguchi, Shunsuke; Itoi, Shiro; Nakai, Shizuko; Takai, Noriyuki; Sugita, Haruo

    2016-09-01

    The complete mitochondrial genome of the Japanese gnomefish, Scombrops gilberti, was determined using a PCR-based method. The total length of mitochondrial DNA (mtDNA) is 16 518 bp, which includes 13 protein-coding genes, two ribosomal RNA (rRNA) genes, 22 transfer RNA (tRNA) genes, and one control region. The mitochondrial gene arrangement of S. gilberti was found to be identical to that of other scombropid and indeed, other teleosts as well. Maximum likelihood analysis revealed that Scombropidae forms a sister group to Pempheriformes. PMID:26153741

  12. Comparative analysis of sex chromosomes in Leporinus species (Teleostei, Characiformes) using chromosome painting

    Science.gov (United States)

    2013-01-01

    Background The Leporinus genus, belonging to the Anostomidae family, is an interesting model for studies of sex chromosome evolution in fish, particularly because of the presence of heteromorphic sex chromosomes only in some species of the genus. In this study we used W chromosome-derived probes in a series of cross species chromosome painting experiments to try to understand events of sex chromosome evolution in this family. Results W chromosome painting probes from Leporinus elongatus, L. macrocephalus and L. obtusidens were hybridized to each others chromosomes. The results showed signals along their W chromosomes and the use of L. elongatus W probe against L. macrocephalus and L. obtusidens also showed signals over the Z chromosome. No signals were observed when the later aforementioned probe was used in hybridization procedures against other four Anostomidae species without sex chromosomes. Conclusions Our results demonstrate a common origin of sex chromosomes in L. elongatus, L. macrocephalus and L. obtusidens but suggest that the L. elongatus chromosome system is at a different evolutionary stage. The absence of signals in the species without differentiated sex chromosomes does not exclude the possibility of cryptic sex chromosomes, but they must contain other Leporinus W sequences than those described here. PMID:23822802

  13. Adult habitat preferences, larval dispersal, and the comparative phylogeography of three Atlantic surgeonfishes (Teleostei: Acanthuridae).

    Science.gov (United States)

    Rocha, Luiz A; Bass, Anna L; Robertson, D Ross; Bowen, Brian W

    2002-02-01

    Although many reef fishes of the tropical Atlantic are widely distributed, there are large discontinuities that may strongly influence phylogeographical patterns. The freshwater outflow of the Amazon basin is recognized as a major barrier that produces a break between Brazilian and Caribbean faunas. The vast oceanic distances between Brazil and the mid-Atlantic ridge islands represent another formidable barrier. To assess the relative importance of these barriers, we compared a fragment of the mitochondrial DNA (mtDNA) cytochrome b gene among populations of three species of Atlantic surgeonfishes: Acanthurus bahianus, A. chirurgus and A. coeruleus. These species have similar life histories but different adult habitat preferences. The mtDNA data show no population structure between Brazil and the mid-Atlantic islands, indicating that this oceanic barrier is readily traversed by the pelagic larval stage of all three surgeonfishes, which spend approximately 45-70 days in the pelagic environment. The Amazon is a strong barrier to dispersal of A. bahianus (d = 0.024, phiST = 0.724), a modest barrier for A. coeruleus (phiST = 0.356), and has no discernible effect as a barrier for A. chirurgus. The later species has been collected on soft bottoms with sponge habitats under the Amazon outflow, indicating that relaxed adult habitat requirements enable it to readily cross that barrier. A limited ability to use soft bottom habitats may also explain the low (but significant) population structure in A. coeruleus. In contrast, A. bahianus has not been collected over deep sponge bottoms, and rarely settles outside shallow reefs. Overall, adult habitat preferences seem to be the factor that differentiates phylogeographical patterns in these reef-associated species. PMID:11856425

  14. 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.

  15. Cytogenetic characterization of Brycon amazonicus (Spix et Agassiz, 1829) (Teleostei: Characidae) from Caicara del Orinoco, Venezuela

    OpenAIRE

    Mariguela,T; Nirchio, M.; E Ron; Gaviria, J.; Fausto Foresti; Claudio Oliveira

    2010-01-01

    A cytogenetic analysis by conventional Giemsa staining, silver staining, C-banding, and fluorescence in situ hybridization (FISH) was carried out on Brycon amazonicus from Caicara del Orinoco, Venezuela. The karyotype of this species is characterized by the presence of 2n = 50 chromosomes, a karyotypic formula 22m+14sm+14st, and a fundamental number of 100 chromosomal arms. Nucleolar organizer regions (NORs) and 18S rDNA genes are located in the terminal regions of the long arms of the s...

  16. Revisão taxonômica do gênero Homodiaetus (Teleostei, Siluriformes, Trichomycteridae

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    Koch Walter Rudolf

    2002-01-01

    Full Text Available The genus Homodiaetus Eigenmann & Ward, 1907 is revised and four species are recognized. Its distribution is restricted to southeastern South America, from Uruguay to Paraguay river at west to the coastal drainages of Rio de Janeiro State, Brazil. Homodiaetus is currently distinguished from other genus of Stegophilinae by the combination of the following characters: origin of ventral-fin at midlength between the snout tip and the caudal-fin origin; opercle with three or more odontodes; and gill membranes confluent with the istmus. Homodiaetus anisitsi Eigenmann & Ward, 1907, is diagnosed by the caudal-fin with black middle rays, margin of upper and lower procurrent caudal-fin rays with dark stripes extending to the caudal-fin, and 3-6 opercular odontodes; H. passarellii (Ribeiro, 1944 with 6-7 opercular odontodes, 21-24 lower procurrent caudal-fin rays and 23-26 upper procurrent caudal-fin rays; H. banguela sp. nov. with 9 opercular odontodes, 17-19 lower procurrent caudal-fin rays, 17-22 upper procurrent caudal-fin rays, reduction of fourth pharyngobranchial with only three teeth and untoothed fifth ceratobranchial; and H. graciosa sp. nov. with 5-6 dentary rows, 7-9 opercular odontodes and 16-23 upper procurrent caudal-fin rays.

  17. Lake Tanganyika—A 'Melting Pot' of Ancient and Young Cichlid Lineages (Teleostei: Cichlidae)?

    OpenAIRE

    Weiss, Juliane D.; Cotterill, Fenton P. D.; Schliewen, Ulrich K

    2015-01-01

    A long history of research focused on the East Africa cichlid radiations (EAR) revealed discrepancies between mtDNA and nuclear phylogenies, suggesting that interspecific hybridisation may have been significant during the radiation of these fishes. The approximately 250 cichlid species of Lake Tanganyika have their roots in a monophyletic African cichlid assemblage, but controversies remain about the precise phylogenetic origin and placement of different lineages and consequently about L. Tan...

  18. Lake Tanganyika--a 'melting pot' of ancient and young cichlid lineages (Teleostei: Cichlidae)?

    Science.gov (United States)

    Weiss, Juliane D; Cotterill, Fenton P D; Schliewen, Ulrich K

    2015-01-01

    A long history of research focused on the East Africa cichlid radiations (EAR) revealed discrepancies between mtDNA and nuclear phylogenies, suggesting that interspecific hybridisation may have been significant during the radiation of these fishes. The approximately 250 cichlid species of Lake Tanganyika have their roots in a monophyletic African cichlid assemblage, but controversies remain about the precise phylogenetic origin and placement of different lineages and consequently about L. Tanganyika colonization scenarios. 3312 AFLP loci and the mitochondrial ND2 gene were genotyped for 91 species representing almost all major lacustrine and riverine haplotilapiine east African cichlid lineages with a focus on L. Tanganyika endemics. Explicitly testing for the possibility of ancient hybridisation events, a comprehensive phylogenetic network hypothesis is proposed for the origin and diversification of L. Tanganyika cichlids. Inference of discordant phylogenetic signal strongly suggests that the genomes of two endemic L. Tanganyika tribes, Eretmodini and Tropheini, are composed of an ancient mixture of riverine and lacustrine lineages. For the first time a strong monophyly signal of all non-haplochromine mouthbrooding species endemic to L. Tanganyika ("ancient mouthbrooders") was detected. Further, in the genomes of early diverging L. Tanganyika endemics Trematocarini, Bathybatini, Hemibatini and Boulengerochromis genetic components of other lineages belonging to the East African Radiation appear to be present. In combination with recent palaeo-geological results showing that tectonic activity in the L. Tanganyika region resulted in highly dynamic and heterogeneous landscape evolution over the Neogene and Pleistocene, the novel phylogenetic data render a single lacustrine basin as the geographical cradle of the endemic L. Tanganyika cichlid lineages unlikely. Instead a scenario of a pre-rift origin of several independent L. Tanganyika precursor lineages which diversified in ancient rivers and precursor lakes and then amalgamated in the extant L. Tanganyika basin is put forward as an alternative: the 'melting pot Tanganyika' hypothesis. PMID:25928886

  19. Comparative Osteology of the Suspensorial Complex of Algal-Feeding Cichlids (Pisces, Teleostei) from Lake Tanganyika

    OpenAIRE

    Yamaoka, Kosaku

    1988-01-01

    The comparative osteology of the suspensorial complex in 20 species of epilithic algal feeders from Lake Tanganyika was studied as a means of obtaining fundamental data for understanding the adaptive radiation in feeding habits of cichlid fishes in the East African lakes. Six types of suspensorial complex could be recognized within the 20 species studied. For the palatine, ectopterygoid, entopterygoid, metapterygoid, quadrate, symplectic, preoperculum and hyomandibula, 5, 2, 3, 3, 5, 2, 2 and...

  20. A revision of the genus Astatoreochromis (Teleostei, Cichlidae, East–Africa

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    Jos Snoeks

    2013-02-01

    Full Text Available A taxonomic revision of the cichlid genus Astatoreochromis is presented. Eighteen meristic and 23 morphometric measurements were taken on 185 individuals, including type specimens. While fin counts separate populations from the Lake Victoria region (Astatoreochromis alluaudi from those of the Rusizi and Malagarazi rivers in the Lake Tanganyika basin (A. vanderhorsti and A. straeleni respectively, clear differentiation was not detected between the latter two. Mann-Whitney U-tests on specimens of comparable size from the two Tanganyika populations revealed significant differences in specimens 75 mm SL and Astatoreochromis vanderhorsti is herein considered a junior synonym of A. straeleni. A redescription of the two valid species of Astatoreochromis, A. alluaudi and A.straeleni, is provided.

  1. Lake Tanganyika--a 'melting pot' of ancient and young cichlid lineages (Teleostei: Cichlidae?

    Directory of Open Access Journals (Sweden)

    Juliane D Weiss

    Full Text Available A long history of research focused on the East Africa cichlid radiations (EAR revealed discrepancies between mtDNA and nuclear phylogenies, suggesting that interspecific hybridisation may have been significant during the radiation of these fishes. The approximately 250 cichlid species of Lake Tanganyika have their roots in a monophyletic African cichlid assemblage, but controversies remain about the precise phylogenetic origin and placement of different lineages and consequently about L. Tanganyika colonization scenarios. 3312 AFLP loci and the mitochondrial ND2 gene were genotyped for 91 species representing almost all major lacustrine and riverine haplotilapiine east African cichlid lineages with a focus on L. Tanganyika endemics. Explicitly testing for the possibility of ancient hybridisation events, a comprehensive phylogenetic network hypothesis is proposed for the origin and diversification of L. Tanganyika cichlids. Inference of discordant phylogenetic signal strongly suggests that the genomes of two endemic L. Tanganyika tribes, Eretmodini and Tropheini, are composed of an ancient mixture of riverine and lacustrine lineages. For the first time a strong monophyly signal of all non-haplochromine mouthbrooding species endemic to L. Tanganyika ("ancient mouthbrooders" was detected. Further, in the genomes of early diverging L. Tanganyika endemics Trematocarini, Bathybatini, Hemibatini and Boulengerochromis genetic components of other lineages belonging to the East African Radiation appear to be present. In combination with recent palaeo-geological results showing that tectonic activity in the L. Tanganyika region resulted in highly dynamic and heterogeneous landscape evolution over the Neogene and Pleistocene, the novel phylogenetic data render a single lacustrine basin as the geographical cradle of the endemic L. Tanganyika cichlid lineages unlikely. Instead a scenario of a pre-rift origin of several independent L. Tanganyika precursor lineages which diversified in ancient rivers and precursor lakes and then amalgamated in the extant L. Tanganyika basin is put forward as an alternative: the 'melting pot Tanganyika' hypothesis.

  2. Huangshan population of Chinese Zacco platypus (Teleostei, Cyprinidae) harbors diverse matrilines and high genetic diversity

    OpenAIRE

    Zheng, Xin; ZHOU, Tian-Qi; Wan, Tao; PERDICES, Anabel; Yang, Jin-Quan; Tang, Xin-Sheng; WANG, Zheng-Ping; HUANG, Li-Qun; Huang, Song; HE, Shun-Ping

    2016-01-01

    Six main mitochondrial DNA (mtDNA) lineages have been described in minnow (Zacco platypus) samples obtained from northern, western and southern China. Perdices et al. (2004) predicted that further sampling of other tributaries might discover more lineages of this species. In this study, we collected 26 Zacco platypus individuals in the Huangshan area of eastern China and determined the cytochrome b (cytb) sequence variations. Combined with reported data in GenBank, ...

  3. Huangshan population of Chinese Zacco platypus (Teleostei, Cyprinidae) harbors diverse matrilines and high genetic diversity.

    Science.gov (United States)

    Zheng, Xin; Zhou, Tian-Qi; Wan, Tao; Perdices, Anabel; Yang, Jin-Quan; Tang, Xin-Sheng; Wang, Zheng-Ping; Huang, Li-Qun; Huang, Song; He, Shun-Ping

    2016-03-18

    Six main mitochondrial DNA (mtDNA) lineages have been described in minnow (Zacco platypus) samples obtained from northern, western and southern China. Perdices et al. (2004) predicted that further sampling of other tributaries might discover more lineages of this species. In this study, we collected 26 Zacco platypus individuals in the Huangshan area of eastern China and determined the cytochrome b (cytb) sequence variations. Combined with reported data in GenBank, we identified ten matrilines (Zacco A-J) in a total of 169 samples, with relatively high molecular divergence found among them. The Huangshan population had the greatest genetic variation among all sampled regions and hosted six of the ten matrilines. Our results highlight the significance of the Huangshan area for the conservation of Zacco platypus. PMID:27029868

  4. Amblyceps accari, a new species of torrent catfish (Teleostei: Amblycipitidae) from the Western Ghats of India.

    Science.gov (United States)

    Dahanukar, Neelesh; Raghavan, Rajeev; Ali, Anvar; Britz, Ralf

    2016-01-01

    A new species of torrent catfish, Amblyceps accari, is described from the central region of the Western Ghats of India. The new species differs from all its congeners by having 12 branched anal-fin rays (vs. 7-10 in other Amblyceps, rarely 11 in A. tuberculatum). It differs further from all other species of the genus except A. murraystuarti and A. torrentis in having the adipose fin confluent with the dorsal procurrent part of the caudal fin and by the following combination of characters from all its congeners: jaws unequal with lower jaw weakly-projecting, pectoral spine smooth, adipose-fin origin opposite anal-fin origin, dorsal fin to adipose-fin distance more than one fourth of standard length, adipose fin long with its base more than one-fourth of standard length, and deeply forked caudal fin with minute, poorly developed, centrally projecting hooks on the proximal lepidotrichia of central caudal-fin rays. The discovery of the new species represents the first record of this genus from peninsular India. PMID:27394861

  5. The complete mitochondrial genome of the rocky reef fish Cheilodactylus variegatus Valenciennes, 1833 (Teleostei: Cheilodactylidae).

    Science.gov (United States)

    Quezada-Romegialli, Claudio; Véliz, David; Docmac, Felipe; Harrod, Chris

    2016-07-01

    Cheilodactylus variegatus is a common benthivorous marine fish inhabiting in rocky subtidal habitats in the eastern south Pacific coast of Chile and Peru. However, its biology and ecology are relatively understudied and its taxonomic assignment has been debated recently. The complete mitochondrial genome was assembled de novo and mapped to a reference using 5.97 million of reads obtained through Ion Torrent next generation sequencing, resulting in a circular sequence of 16,652 bp in length. Gene composition and arrangement comprised to that reported for most fishes and contained the typical structure of 2 rRNAs, 13 protein-coding genes, 22 tRNAs and 1 non-coding region. This mitogenome provides a valuable resource for studies of fish molecular systematics, phylogeography and population genetics. PMID:25970628

  6. Molecular Phylogeny and Zoogeography of the Capoeta damascina Species Complex (Pisces: Teleostei: Cyprinidae.

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    Nisreen Alwan

    Full Text Available Capoeta damascina was earlier considered by many authors as one of the most common freshwater fish species found throughout the Levant, Mesopotamia, Turkey, and Iran. However, owing to a high variation in morphological characters among and within its various populations, 17 nominal species were described, several of which were regarded as valid by subsequent revising authors. Capoeta damascina proved to be a complex of closely related species, which had been poorly studied. The current study aims at defining C. damascina and the C. damascina species complex. It investigates phylogenetic relationships among the various members of the C. damascina complex, based on mitochondrial and nuclear DNA sequences. Phylogenetic relationships were projected against paleogeographical events to interpret the geographic distribution of the taxa under consideration in relation to the area's geological history. Samples were obtained from throughout the geographic range and were subjected to genetic analyses, using two molecular markers targeting the mitochondrial cytochrome oxidase I (n = 103 and the two adjacent divergence regions (D1-D2 of the nuclear 28S rRNA genes (n = 65. Six closely related species were recognized within the C. damascina complex, constituting two main lineages: A western lineage represented by C. caelestis, C. damascina, and C. umbla and an eastern lineage represented by C. buhsei, C. coadi, and C. saadii. The results indicate that speciation of these taxa is rather a recent event. Dispersal occurred during the Pleistocene, resulting in present-day distribution patterns. A coherent picture of the phylogenetic relationships and evolutionary history of the C. damascina species complex is drawn, explaining the current patterns of distribution as a result of paleogeographic events and ecological adaptations.

  7. Molecular Phylogeny and Zoogeography of the Capoeta damascina Species Complex (Pisces: Teleostei: Cyprinidae).

    Science.gov (United States)

    Alwan, Nisreen; Esmaeili, Hamid-Reza; Krupp, Friedhelm

    2016-01-01

    Capoeta damascina was earlier considered by many authors as one of the most common freshwater fish species found throughout the Levant, Mesopotamia, Turkey, and Iran. However, owing to a high variation in morphological characters among and within its various populations, 17 nominal species were described, several of which were regarded as valid by subsequent revising authors. Capoeta damascina proved to be a complex of closely related species, which had been poorly studied. The current study aims at defining C. damascina and the C. damascina species complex. It investigates phylogenetic relationships among the various members of the C. damascina complex, based on mitochondrial and nuclear DNA sequences. Phylogenetic relationships were projected against paleogeographical events to interpret the geographic distribution of the taxa under consideration in relation to the area's geological history. Samples were obtained from throughout the geographic range and were subjected to genetic analyses, using two molecular markers targeting the mitochondrial cytochrome oxidase I (n = 103) and the two adjacent divergence regions (D1-D2) of the nuclear 28S rRNA genes (n = 65). Six closely related species were recognized within the C. damascina complex, constituting two main lineages: A western lineage represented by C. caelestis, C. damascina, and C. umbla and an eastern lineage represented by C. buhsei, C. coadi, and C. saadii. The results indicate that speciation of these taxa is rather a recent event. Dispersal occurred during the Pleistocene, resulting in present-day distribution patterns. A coherent picture of the phylogenetic relationships and evolutionary history of the C. damascina species complex is drawn, explaining the current patterns of distribution as a result of paleogeographic events and ecological adaptations. PMID:27309854

  8. Peroxisomes in intestinal and gallbladder epithelial cells of the stickleback, Gasterosteus aculeatus L. (Teleostei)

    NARCIS (Netherlands)

    Ruiter, A.J.H. de; Veenhuis, M.; Wendelaar Bonga, S.E.

    1988-01-01

    The occurrence of microbodies in the epithelial cells of the intestine and gallbladder of the stickleback, Gasterosteus aculeatus L., is described. In the intestine the organelles are predominantly located in the apical and perinuclear zone of the cells and may contain small crystalline cores. In ga

  9. Local ecological knowledge on the goliath grouper epinephelus itajara (teleostei: serranidae in southern Brazil

    Directory of Open Access Journals (Sweden)

    Leopoldo Cavaleri Gerhardinger

    2006-12-01

    Full Text Available The goliath grouper Epinephelus itajara is a large sized (> 400 kg and critically endangered marine fish, which is protected in many countries, including Brazil. Through the application of semi-structured interviews, we investigated the local ecological knowledge of seven fishermen specialist on catching E. itajara from the Babitonga bay, Santa Catarina, Brazil. Local long-line fisheries for E. itajara seemed to be a disappearing tradition in the studied site, with a detailed inherent local ecological knowledge system, which is also being lost. Our study also showed that fishermen engaged in recent fisheries, such as spear-fishing, can also possess a detailed local ecological knowledge system. Through the analysis of fishermen local ecological knowledge, several aspects of E. itajara life history were registered. This species is found in the inner and outer Babitonga bay, from saline waters to areas with a large input of freshwater, and inhabits submerged wooden substrates and artificial reefs such as shipwrecks, mooring pillars and cargo containers. It is known to spawn in December and subsequent summer months in the studied area. Spawning aggregations are usually seen in December (during full moon, being also eventually observed in January and February by our informants. While lobsters, spadefishes and octopuses seem to constitute the most important food items of inner bay E. itajara, outer bay individuals may feed on catfishes, crustaceans and other fish species. The goliath grouper is regarded as pacific and curious fish, but frequently display agonistic behavior in the presence of divers. Based on the perception of well experienced spear fishermen, we hypothesize that E. itajara undertakes seasonal migrations from the inner to the outer bay during summer, and that the studied population is suffering from growth over-fishing. Our data provides a practical evidence of how joining scientific and local ecological knowledge will likely benefit E. itajara local conservation and management practices by adding important new biological data into the decision-making process.O mero Epinephelus itajara é uma espécie de peixe marinho de grandes proporções (>400 kg e criticamente ameaçado, protegido em muitos países, incluindo o Brasil. Através da aplicação de entrevistas semi-estruturadas, investigamos o conhecimento ecológico local de pescadores de espinhel e pesca subaquática, especialistas na captura de E. itajara na baía Babitonga, Santa Catarina, Brasil. A pescaria de espinhel direcionada à E. itajara parece ser uma tradição em desaparecimento, com um detalhado sistema de conhecimento ecológico local que está também sendo perdido com o tempo. Nosso estudo mostra que pescadores envolvidos em pescarias recentes, como a pesca subaquática, podem também possuir detalhado sistema de conhecimento ecológico local. Através da análise e integração do conhecimento ecológico local dos informantes, diversos aspectos da história de vida de E. itajara foram registrados. Esta espécie é encontrada na porção interna e externa da baía Babitonga, em águas salinas e em água com grande aporte de água doce, habitando resquícios de troncos submersos e recifes artificiais como naufrágios, píers e containeres de carga. Epinephelus itajara é conhecido por reproduzir-se em dezembro e meses subseqüentes de verão na área de estudo. Agregações reprodutivas são usualmente observadas em dezembro (lua cheia, e eventualmente em janeiro e fevereiro. Enquanto lagostas, enxadas e polvos parecem constituir os itens alimentares mais importantes de E. itajara habitando o interior da baía, indivíduos de fora da baía Babitonga parecem alimentar-se de bagres, crustáceos e outras espécies de peixe. Os meros são considerados peixes curiosos e pacíficos, mas freqüentemente demonstram comportamento agonístico na presença de mergulhadores. Nós propomos a hipótese de que E. itajara realiza migrações sazonais do interior para o exterior da baía no verão, e que a população estudada está sofrendo de sobrepesca do crescimento. Nossos dados proporcionam evidências práticas de como a integração do conhecimento científico e tradicional pode beneficiar as práticas locais de conservação e manejo de E. itajara ao adicionar novas informações biológicas importantes no processo de tomada de decisão.

  10. Early life history of daubed shanny (Teleostei: Leptoclinus maculatus) in Svalbard waters

    OpenAIRE

    Ottesen, Camilla; Hop, Haakon; Christiansen, Jørgen Schou; Falk-Petersen, Stig

    2011-01-01

    The daubed shanny (Leptoclinus maculatus, Family Stichaeidae) is considered to be an ecologically significant species in the arctic waters of Norway because of high abundance and the unique energy storage abilities of its postlarvae. Both postlarvae and adults are found in relative large abundances in Svalbard fjords as well as along the ice edge of north-east Svalbard, even at sub-zero temperatures. The postlarva feeds primarily on Calanus spp. and stores lipids from this high-energy diet in...

  11. Morphology-diet relationships in four killifishes (Teleostei, Cyprinodontidae, Orestias) from Lake Titicaca

    OpenAIRE

    Maldonado, E; Hubert, Nicolas; Sagnes, P.; Mérona, Bernard de

    2009-01-01

    This study explores the relationship between morphology and diet in four Andean killifishes (Orestias) from Lake Titicaca that are known to differ in habitat use. Species that fed preferentially on amphipods (Orestias albus) or molluscs (Orestias luteus) separated in multivariate space from other species that feed on cladocera and algae (Orestias agassii and Orestias jussiei). Generally, specimens feeding on cladocera were characterized by a short, blunt nose with a small mouth; whereas, spec...

  12. Mortality rates in two populations of the viviparous fish Poeciliopsis baenschi (Teleostei: Poeciliidae)

    OpenAIRE

    Alejandro Molina-Moctezuma; José Jaime Zúñiga-Vega; Héctor Espinosa-Pérez

    2013-01-01

    Mortality is one of the most important demographic features. Measures of size- or sex-specific mortality can help to explain local selective pressures and can also be used to construct demographic models that estimate population trends. This study estimated mortality rates for 2 populations of a viviparous freshwater fish, endemic to western Mexico (Poeciliopsis baenschi). We found that mortality was size- and sex-dependent and different between both populations. We compared our findings with...

  13. Biologie de Colossoma macropomum (Teleostei : Serrasalmidae) dans le bassin du Mamoré (Amazonie bolivienne)

    OpenAIRE

    Loubens, Gérard; Panfili, Jacques

    1997-01-01

    The biology of #Colossoma macropomum$ is studied in the Trinidad region (Mamore Basin, Bolivia) and the results are compared with those from other basins. Almost unexploited in Bolivia, #C. macropomum$ stocks are already in regression in central Amazonia. It inhabits flood-plain and is indifferent to the two main water types, white waters originally from the Andes and black waters formed in "pampas". It is oustandingly resistant to hypoxia through the development of lower lip extensions often...

  14. Genetic variability of broodstocks of Tambaqui (Teleostei – Characidae from the northeast region of Brazil

    Directory of Open Access Journals (Sweden)

    Nelson Mauricio Lopera-Barrero

    2015-12-01

    Full Text Available The objective of this experiment was to evaluate the genetic diversity within three Tambaqui broodstocks (Colossoma macropomum. Eight primers were used to analyze 67 individuals collected from three fish farming in the municipalities: Porto Real do Colégio – Alagoas (PRC, Araujo 1 – Sergipe (AR1 and Araujo 2 – Sergipe (AR2, in Brazil. Differences in the frequencies of 88 fragments and four exclusive fragments in PRC were found. High polymorphism values (from 54.38% to 64.38% and Shannon´s index (from 0.33 to 0.37 were observed. The AMOVA showed that high variation is within each broodstock. The identity and the genetic distance among the groups ranged from 0.845 to 0.975 and from 0.025 to 0.156 respectively, and the shortest distance was found in the groups PRC x AR1 and PRC x AR2. The genetic differentiation ranged from lower to higher (Fst = 0.03 and 0.178 as well as the migratory number per generation (Nm = 5.07 to 12.8. In general, the broodstocks had high intra-population variability, and high differentiation and genetic distance within themselves.

  15. A new species of Saturnius Manter, 1969 (Digenea: Hemiuridae) from Mediterranean mullet (Teleostei: Mugilidae)

    Czech Academy of Sciences Publication Activity Database

    Marzoug, D.; Rima, M.; Boutiba, Z.; Georgieva, Simona; Kostadinova, Aneta; Pérez-del-Olmo, A.

    2014-01-01

    Roč. 87, č. 2 (2014), s. 127-134. ISSN 0165-5752 R&D Projects: GA ČR GBP505/12/G112 Institutional support: RVO:60077344 Keywords : Digenea * phylogeny * Platyhelminthes * Trematoda * inference * evolution Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 1.336, year: 2014

  16. Multi-locus fossil-calibrated phylogeny of Atheriniformes (Teleostei, Ovalentaria).

    Science.gov (United States)

    Campanella, Daniela; Hughes, Lily C; Unmack, Peter J; Bloom, Devin D; Piller, Kyle R; Ortí, Guillermo

    2015-05-01

    Phylogenetic relationships among families within the order Atheriniformes have been difficult to resolve on the basis of morphological evidence. Molecular studies so far have been fragmentary and based on a small number taxa and loci. In this study, we provide a new phylogenetic hypothesis based on sequence data collected for eight molecular markers for a representative sample of 103 atheriniform species, covering 2/3 of the genera in this order. The phylogeny is calibrated with six carefully chosen fossil taxa to provide an explicit timeframe for the diversification of this group. Our results support the subdivision of Atheriniformes into two suborders (Atherinopsoidei and Atherinoidei), the nesting of Notocheirinae within Atherinopsidae, and the monophyly of tribe Menidiini, among others. We propose taxonomic changes for Atherinopsoidei, but a few weakly supported nodes in our phylogeny suggests that further study is necessary to support a revised taxonomy of Atherinoidei. The time-calibrated phylogeny was used to infer ancestral habitat reconstructions to explain the current distribution of marine and freshwater taxa. Based on these results, the current distribution of Atheriniformes is likely due to widespread marine dispersal along the margins of continents, infrequent trans-oceanic dispersal, and repeated invasion of freshwater habitats. This conclusion is supported by post-Gondwanan divergence times among families within the order, and a high probability of a marine ancestral habitat. PMID:25769409

  17. Do invasive bighead goby Neogobius kessleri and round goby N. melanostomus (Teleostei, Gobiidae compete for food?

    Directory of Open Access Journals (Sweden)

    Števove B.

    2013-08-01

    Full Text Available Bighead goby (Neogobius kessleri and round goby (Neogobius melanostomus have been invading new non-native areas about two decades successfully. In this study, diet spectrum, seasonal variation, feeding strategy and diet overlap between these two invasive species were assessed. Materials were collected from the Danube at Bratislava by fishing rods and/or electrofishing. The diet spectrum of both species was diverse: a total of 46 food types in bighead goby and 51food types in round goby were observed. Dikerogammarus sp., chironomid larvae and Corophium sp. were the most predominant food types in bighead goby, whereas in round goby, chironomid larvae, Corophium sp., bryozoans and Cladocera predominated. The diet varied over seasons. In the Slovak part of the Danube, bighead goby and round goby have adapted to local food resources, consuming diverse food from small to large items, both with soft and/or hard body. This enhances the capability of these invasive species to spread successfully. It appears that even if both exploit similar food resources, their proportional content differs. Further differences between these gobies were also found in their food behaviour and feeding strategy. Both species tend to be specialists where possible, but round goby demonstrates higher flexibility towards general feeding strategy.

  18. Mitochondrial molecular clocks and the origin of the major Otocephalan clades (Pisces: Teleostei)

    DEFF Research Database (Denmark)

    Peng, Zuogang; He, Shunping; Wang, Jun;

    2006-01-01

    The Otocephala, a clade including ostariophysan and clupeomorph teleosts, represents about a quarter of total fish species diversity, with about 1000 genera and more than 7000 species. A series of recent papers have defended that the origin of this clade and of its major groups may be significantly...... otophysans could have originated before the splitting of the Pangean supercontinent is of extreme importance, since otophysan fishes are among the most useful animal groups for the determination of historical continental relationships. In the present work we examined divergence times for each major...... otocephalan group by an analysis of complete mtDNA sequences, in order to investigate if these divergence times support the hypotheses advanced in recent studies. The complete mtDNA sequences of nine representative non-otocephalan fish species and of twenty-one representative otocephalan species was compared...

  19. The complete mitogenome of the Murray Cod, Maccullochella peelii (Mitchell, 1838) (Teleostei: Percichthyidae).

    Science.gov (United States)

    Austin, Christopher M; Tan, Mun Hua; Lee, Yin Peng; Croft, Laurence J; Gan, Han Ming

    2016-01-01

    The complete mitochondrial genome of the iconic Australian freshwater fish, the Murray Cod, Maccullochella peelii, was recovered from partial genome sequencing data using the HiSeq platform (Illumina, San Diego, CA). The mitogenome consists of 16,442 bp (58% A + T content) containing 13 protein-coding genes, 2 ribosomal subunit genes, 22 transfer RNAs, and a 768 bp non-coding AT-rich region. This is the first mitogenome sequence for the genus Maccullochella, and the fourth for the family Percichthyidae. PMID:24779601

  20. A new cryptic species of Aponurus Looss, 1907 (Digenea: Lecithasteridae) from Mediterranean goatfish (Teleostei: Mullidae)

    Czech Academy of Sciences Publication Activity Database

    Carreras-Aubets, M.; Repulles-Albelda, A.; Kostadinova, Aneta; Carrasson, M.

    2011-01-01

    Roč. 79, č. 2 (2011), 145-159. ISSN 0165-5752 R&D Projects: GA MŠk LC522; GA ČR GAP505/10/1562 Institutional research plan: CEZ:AV0Z60220518 Keywords : N. SP DIGENEA * ALLOMETRIC GROWTH * MARINE FISHES * MULLUS-SURMULETUS * TREMATODES * MONORCHIIDAE * HEMIUROIDEA * BELIZE * ISRAEL Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 1.250, year: 2011

  1. Sexual ornaments, body morphology, and swimming performance in naturally hybridizing swordtails (teleostei: xiphophorus.

    Directory of Open Access Journals (Sweden)

    James B Johnson

    Full Text Available Determining the costs of sexual ornaments is complicated by the fact that ornaments are often integrated with other, non-sexual traits, making it difficult to dissect the effect of ornaments independent of other aspects of the phenotype. Hybridization can produce reduced phenotypic integration, allowing one to evaluate performance across a broad range of multivariate trait values. Here we assess the relationship between morphology and performance in the swordtails Xiphophorus malinche and X. birchmanni, two naturally-hybridizing fish species that differ extensively in non-sexual as well as sexual traits. We took advantage of novel trait variation in hybrids to determine if sexual ornaments incur a cost in terms of locomotor ability. For both fast-start and endurance swimming, hybrids performed at least as well as the two parental species. The sexually-dimorphic sword did not impair swimming performance per se. Rather, the sword negatively affected performance only when paired with a sub-optimal body shape. Studies seeking to quantify the costs of ornaments should consider that covariance with non-sexual traits may create the spurious appearance of costs.

  2. Sexual Ornaments, Body Morphology, and Swimming Performance in Naturally Hybridizing Swordtails (Teleostei: Xiphophorus)

    OpenAIRE

    Johnson, James B.; Danielle C Macedo; Passow, Courtney N.; Rosenthal, Gil G.

    2014-01-01

    Determining the costs of sexual ornaments is complicated by the fact that ornaments are often integrated with other, non-sexual traits, making it difficult to dissect the effect of ornaments independent of other aspects of the phenotype. Hybridization can produce reduced phenotypic integration, allowing one to evaluate performance across a broad range of multivariate trait values. Here we assess the relationship between morphology and performance in the swordtails Xiphophorus malinche and X. ...

  3. Description of a new species of Apistogramma from the Rio Madeira System in Brazil (Teleostei, Cichlidae)

    OpenAIRE

    Sven O Kullander

    1980-01-01

    Apistogramma resticulosa sp.n. is described on the basis of six specimens, 12.8-26.5 mm standard length, from near Humaitá, Brazil. It belongs to the A. regani species-group and is distinguished by the vertical dash-marking of the abdominal sides.

  4. Description of a new species of genus Gobio from Turkey (Teleostei: Cyprinidae)

    Czech Academy of Sciences Publication Activity Database

    Turan, D.; Ekmekci, F. G.; Lusková, Věra; Mendel, Jan

    2012-01-01

    Roč. 3257, - (2012), s. 56-65. ISSN 1175-5326 R&D Projects: GA ČR GP206/09/P608 Institutional support: RVO:68081766 Keywords : Gobio sakaryaensis * gudgeon * Anatolia * taxonomy Subject RIV: EG - Zoology Impact factor: 0.974, year: 2012 http://www.mapress.com/zootaxa/2012/f/z03257p065f.pdf

  5. Uncovering the Ancestry of B Chromosomes in Moenkhausia sanctaefilomenae (Teleostei, Characidae)

    Science.gov (United States)

    Utsunomia, Ricardo; Silva, Duílio Mazzoni Zerbinato de Andrade; Ruiz-Ruano, Francisco J.; Araya-Jaime, Cristian; Pansonato-Alves, José Carlos; Scacchetti, Priscilla Cardim; Hashimoto, Diogo Teruo; Oliveira, Claudio; Trifonov, Vladmir A.; Porto-Foresti, Fábio; Camacho, Juan Pedro M.; Foresti, Fausto

    2016-01-01

    B chromosomes constitute a heterogeneous mixture of genomic parasites that are sometimes derived intraspecifically from the standard genome of the host species, but result from interspecific hybridization in other cases. The mode of origin determines the DNA content, with the B chromosomes showing high similarity with the A genome in the first case, but presenting higher similarity with a different species in the second. The characid fish Moenkhausia sanctaefilomenae harbours highly invasive B chromosomes, which are present in all populations analyzed to date in the Parana and Tietê rivers. To investigate the origin of these B chromosomes, we analyzed two natural populations: one carrying B chromosomes and the other lacking them, using a combination of molecular cytogenetic techniques, nucleotide sequence analysis and high-throughput sequencing (Illumina HiSeq2000). Our results showed that i) B chromosomes have not yet reached the Paranapanema River basin; ii) B chromosomes are mitotically unstable; iii) there are two types of B chromosomes, the most frequent of which is lightly C-banded (similar to euchromatin in A chromosomes) (B1), while the other is darkly C-banded (heterochromatin-like) (B2); iv) the two B types contain the same tandem repeat DNA sequences (18S ribosomal DNA, H3 histone genes, MS3 and MS7 satellite DNA), with a higher content of 18S rDNA in the heterochromatic variant; v) all of these repetitive DNAs are present together only in the paracentromeric region of autosome pair no. 6, suggesting that the B chromosomes are derived from this A chromosome; vi) the two B chromosome variants show MS3 sequences that are highly divergent from each other and from the 0B genome, although the B2-derived sequences exhibit higher similarity with the 0B genome (this suggests an independent origin of the two B variants, with the less frequent, B2 type presumably being younger); and vii) the dN/dS ratio for the H3.2 histone gene is almost 4–6 times higher for B chromosomes than for A chromosome sequences, suggesting that purifying selection is relaxed for the DNA sequences located on the B chromosomes, presumably because they are mostly inactive. PMID:26934481

  6. Whole chromosome painting of B chromosomes of the red-eye tetra Moenkhausia sanctaefilomenae (Teleostei, Characidae)

    Science.gov (United States)

    Scudeler, Patricia Elda Sobrinho; Diniz, Débora; Wasko, Adriane Pinto; Oliveira, Claudio; Foresti, Fausto

    2015-01-01

    Abstract B chromosomes are dispensable genomic elements found in different groups of animals and plants. In the present study, a whole chromosome probe was generated from a specific heterochromatic B chromosome occurring in cells of the characidae fish Moenkhausia sanctaefilomenae (Steindachner, 1907). The chromosome painting probes were used in fluorescence in situ hybridization (FISH) experiments for the assessment of metaphase chromosomes obtained from individuals from three populations of Moenkhausia sanctaefilomenae. The results revealed that DNA sequences were shared between a specific B chromosome and many chromosomes of the A complement in all populations analyzed, suggesting a possible intra-specific origin of these B chromosomes. However, no hybridization signals were observed in other B chromosomes found in the same individuals, implying a possible independent origin of B chromosome variants in this species. FISH experiments using 18S rDNA probes revealed the presence of non-active ribosomal genes in some B chromosomes and in some chromosomes of the A complement, suggesting that at least two types of B chromosomes had an independent origin. The role of heterochromatic segments and ribosomal sequences in the origin of B chromosomes were discussed. PMID:26753081

  7. The effects of chronic irradiation on the breeding performance of the guppy, Poecilia reticulata (Osteichthyes: Teleostei)

    International Nuclear Information System (INIS)

    The effects of chronic irradiation on the life-time breeding performance of the small tropical fish, Poecilia reticulata, have been investigated at mean dose-rates of 0.17, 0.40 and 1.27 rad hour-1. The total fecundity was markedly (P<0.001) reduced at all dose-rates owing to a decrease in mean actual brood-size and an increase in temporary and permanent infertility. Minor progressive changes in the interbrood time with age and dose-rate were noted. The neonatal death-rate, incidence of abnormalities, and survival and sex ratio of the offspring were unaffected by irradiation. The brood-size data have been used to derive estimates of the dominant lethal mutation rate which are of the same order as those determined for mammals. Histological studies indicate that functional sterility is not necessarily dependent on the destruction of the gonads, and it is possible that radiation effects on pituitary function are responsible for much of the observed infertility. (author)

  8. Redescription of Gobio nigrescens from the Hari River drainage (Teleostei: Cyprinidae).

    Science.gov (United States)

    Mousavi-Sabet, Hamed; Ganjbakhsh, Babak; Geiger, Matthias F; Geiger, Matthias F; Freyhof, Jörg

    2016-01-01

    Gobio nigrescens, from the Hari River drainage, is redescribed. It represents a valid species distinguished from congeners in the adjacent Caspian and Aral Sea basins by a combination of characters: a naked breast, 16 circumpeduncular scales and 6-7 irregularly shaped, black or brown blotches on back behind dorsal-fin base. PMID:27395112

  9. Ontogeny, variation, and homology in Salvelinus alpinus caudal skeleton (Teleostei: Salmonidae).

    Science.gov (United States)

    Grünbaum, Thomas; Cloutier, Richard

    2010-01-01

    The ontogeny of the caudal skeleton in the Arctic charr, Salvelinus alpinus was examined using an extensive series of cleared and stained specimens. We demonstrate the presence of skeletal components never reported previously within the Salmonidae. In contrast to the generalized condition for salmonids, seven hypurals (instead of six), and four uroneurals (instead of three) have been found in some specimens. Variation in the number and condition of epurals is documented. New hypotheses are proposed concerning (1) relationships among centra and their associated elements, (2) phylogenetic distribution of caudal characters within the Salmonidae, and (3) homology of caudal components. Using the published phylogenetic hypotheses, we provide evidence, that a seventh hypural and a fourth uroneural are taxic atavism in salmonids. The development of the salmonid homocercal fin is discussed in the light of a polyural scheme based on evidences of a one-to-one relationship among ural centra and their associated elements. PMID:19603412

  10. Infection of the heart of Pimelodus ornatus (Teleostei, Pimelodidae), by Myxobolus sp. (Myxozoa, Myxobolidae).

    Science.gov (United States)

    Matos, Edilson; Videira, Marcela; Velasco, Michele; Sanches, Osimar; Clemente, Sergio Carmona de São; Matos, Patricia

    2014-01-01

    The phylum Myxozoa Grassé, 1970, consists of a heterogenous group of around 50 genera that are worldwide disseminated in a wide variety of aquatic media. In the present study, 43 specimens of Pimelodus ornatus were collected from an adjacent area to the Cachoeira do Arari municipality on Marajó Island, in the Brazilian state of Pará, in 2013. Macroscopic analysis showed the presence of whitened plasmodia located in the cardiac muscle and also in the region between the bulbus arteriosus and atrium cordis. Microscopic analysis on the parasitized tissues revealed spores that were typically piriform, with the anterior portion slightly narrower than the posterior end. The spore valves were symmetrical. The present species is placed in the genus Myxobolus Butschli, 1882, because of the presence of a pair of equal polar capsules in each spore. The prevalence of parasitism observed was 13.9% (6/43). This research note reports the first occurrence of Myxobolus as a parasite of the heart in the teleostean fish P. ornatus in the Amazon region and confirms the occurrence of secondary myocarditis in this fish, caused by parasitism by Myxobolus sp. The rarity of this parasitic species of Myxobolus at this tissue site, associated with other spore morphology characteristics in the fish, suggests that it is an undescribed species. PMID:25517538

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

    OpenAIRE

    Américo Moraes Neto; Maelin da Silva; Daniele Aparecida Matoso; Marcelo Ricardo Vicari; Mara Cristina de Almeida; Maria João Collares-Pereira; Roberto Ferreira Artoni

    2011-01-01

    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 an...

  12. Morfología del sistema digestivo de la berrugata Menticirrhus saxatilis (Teleostei: Sciaenidae)

    OpenAIRE

    Abraham Kobelkowsky; Orlando Pantoja Escobar

    2007-01-01

    Como caracteres morfológicos relacionados con la bentofagia, Menticirrhus saxatilis muestra el tentáculo y los orificios mentonianos, el pliegue supraoral, la boca ventral. El esqueleto visceral presenta una notable anchura de los canales mandibular y preopercular del sistema sensorial de la línea lateral. Se reconoce una articulación especial del palatino con el paraesfenoides. Como caracteres sobresalientes de la musculatura visceral se encuentran: la sección tentacular del intermandibulari...

  13. Genetic population structure of sympatric and allopatric populations of Baltic ciscoes (Coregonus albula complex, Teleostei, Coregonidae

    Directory of Open Access Journals (Sweden)

    Nitz Barbara

    2010-03-01

    Full Text Available Abstract Background Teleost fishes of the Coregonidae are good model systems for studying postglacial evolution, adaptive radiation and ecological speciation. Of particular interest is whether the repeated occurrence of sympatric species pairs results from in-situ divergence from a single lineage or from multiple invasions of one or more different lineages. Here, we analysed the genetic structure of Baltic ciscoes (Coregonus albula complex, examining 271 individuals from 8 lakes in northern Germany using 1244 polymorphic AFLP loci. Six lakes had only one population of C. albula while the remaining two lakes had C. albula as well as a sympatric species (C. lucinensis or C. fontanae. Results AFLP demonstrated a significant population structure (Bayesian θB = 0.22. Lower differentiation between allopatric (θB = 0.028 than sympatric (0.063-0.083 populations contradicts the hypothesis of a sympatric origin of taxa, and there was little evidence for stocking or ongoing hybridization. Genome scans found only three loci that appeared to be under selection in both sympatric population pairs, suggesting a low probability of similar mechanisms of ecological segregation. However, removal of all non-neutral loci decreased the genetic distance between sympatric pairs, suggesting recent adaptive divergence at a few loci. Sympatric pairs in the two lakes were genetically distinct from the six other C. albula populations, suggesting introgression from another lineage may have influenced these two lakes. This was supported by an analysis of isolation-by-distance, where the drift-gene flow equilibrium observed among allopatric populations was disrupted when the sympatric pairs were included. Conclusions While the population genetic data alone can not unambiguously uncover the mode of speciation, our data indicate that multiple lineages may be responsible for the complex patterns typically observed in Coregonus. Relative differences within and among lakes raises the possibility that multiple lineages may be present in northern Germany, thus understanding the postglacial evolution and speciation in the C. albula complex requires a large-scale phylogenetic analysis of several potential founder lineages.

  14. Molecular phylogeny of the genus Gobio Cuvier, 1816 (Teleostei: Cyprinidae) and its contribution to taxonomy

    Czech Academy of Sciences Publication Activity Database

    Mendel, Jan; Lusk, Stanislav; Vasil'eva, E. D.; Vasil'ev, V. P.; Lusková, Věra; Ekmekci, F. G.; Erk'kan, F.; Ruchin, A.; Koščo, J.; Vetešník, Lukáš; Halačka, Karel; Šanda, R.; Pashkov, A. N.; Reshetnikov, S. I.

    2008-01-01

    Roč. 47, č. 3 (2008), s. 1061-1075. ISSN 1055-7903 R&D Projects: GA MŽP SM/6/3/05; GA AV ČR IAA6045005 Institutional research plan: CEZ:AV0Z60930519 Keywords : taxonomy * S7indel diagnostics * Gobio Subject RIV: EB - Genetics ; Molecular Biology Impact factor: 3.871, year: 2008

  15. Higher and lower-level relationships of the deep-sea fish order alepocephaliformes (Teleostei

    DEFF Research Database (Denmark)

    Poulsen, Jan Y.; Møller, Peter R.; Lavoué, Sébastien; Knudsen, Steen Wilhelm; Nishida, Mutsumi; Miya, Masaki

    2009-01-01

    found to be monophyletic as sister clade to the rest of Alepocephaliformes. Previously unrecognized clades within the family Alepocephalidae are presented and a clade comprising Alepocephalus, Conocara and Leptoderma was recovered as the most derived. As long as the current classification is being...... followed, the genera Alepocephalus, Bathytroctes, Conocara and Narcetes were all found non-monophyletic. © 2009 The Linnean Society of London....

  16. Hidden diversity within the Prussian carp and designation of a neotype for Carassius gibelio (Teleostei: Cyprinidae)

    Czech Academy of Sciences Publication Activity Database

    Kalous, L.; Bohlen, Jörg; Rylková, K.; Petrtýl, M.

    2012-01-01

    Roč. 23, č. 1 (2012), 11-18. ISSN 0936-9902 R&D Projects: GA ČR GA206/09/1154 Institutional research plan: CEZ:AV0Z50450515 Keywords : fresh water fishes * auratus gibelio * phylogenetic relationships Subject RIV: EG - Zoology Impact factor: 1.648, year: 2012

  17. Phylogenetic relationships of the algae scraping cyprinid genus Capoeta (Teleostei: Cyprinidae)

    Czech Academy of Sciences Publication Activity Database

    Levin, B. A.; Freyhof, J.; Lajbner, Zdeněk; Perea, S.; Abdoli, A.; Gaffaroglu, M.; Özulog, M.; Rubeyan, H.R.; Salnikov, V.B.; Doadrio, I.

    2012-01-01

    Roč. 62, č. 1 (2012), s. 542-549. ISSN 1055-7903 R&D Projects: GA MŠk LC06073 Institutional research plan: CEZ:AV0Z50450515 Keywords : Cyprinidae * Phylogeny * Polyploid barbini Subject RIV: EH - Ecology, Behaviour Impact factor: 4.066, year: 2012 http://www.sciencedirect.com/science/article/pii/S1055790311003940

  18. Molecular phylogeny and biogeography of the Neotropical cichlid fish tribe Cichlasomatini (Teleostei: Cichlidae: Cichlasomatinae)

    Czech Academy of Sciences Publication Activity Database

    Musilová, Zuzana; Říčan, Oldřich; Janko, Karel; Novák, J.

    2008-01-01

    Roč. 46, - (2008), s. 659-672. ISSN 1055-7903 R&D Projects: GA MŠk LC06073 Grant ostatní: GA UK(CZ) 182/2004/B-BIO; GA UK(CZ) 139407 Institutional research plan: CEZ:AV0Z50450515 Keywords : molecular phylogeny * Cichlids * south America Subject RIV: EG - Zoology Impact factor: 3.871, year: 2008

  19. Discovery and phylogenetic analysis of a riverine species flock of African electric fishes (Mormyridae: Teleostei).

    Science.gov (United States)

    Sullivan, John P; Lavoué, Sébastien; Hopkins, Carl D

    2002-03-01

    The evolution of species-specific mate recognition signals is of particular interest within speciose monophyletic groups with restricted distributions (known as "species flocks"). However, the explosive nature of speciation in these clades makes difficult the reconstruction of their phylogenetic history. Here we describe a species flock of riverine mormyrid fishes from west-central Africa in which electric signals may play a role in the reproductive isolation of sympatric species. In our recent field collections, totaling more than 1400 specimens from many localities, we recognize 38 forms that are distinct in their morphologies and electric organ discharge (EOD) characteristics. Of these 38, only four clearly correspond to described species. Here we treat these forms as operational taxonomic units (OTUs) in a phylogenetic analysis of cytochrome b sequence data from a sample of 86 specimens. We examined support in the molecular data for the monophyly of these 38 OTUs considered together, the monophyly of each phenotypically delimited OTU considered individually, and for relationships among OTUs congruent with those inferred from the distribution of morphological and EOD character states. Trees obtained by both maximum-parsimony and maximum-likelihood analyses, rooted with sequence data from outgroup taxa, provide evidence for the monophyly of these 38 OTUs with respect to other mormyrid fishes. The small genetic distances between many distinct forms suggest their recent divergence. However, in many instances the cytochrome b tree topology fails to support the monophyly of individual OTUs and close relationships between OTUs that are similar in morphology and EOD characteristics. In other cases, individuals from distinct OTUs share identical or nearly identical haplotypes. Close examination of these cases suggests that unnatural OTU definition is not the sole cause of this pattern, and we infer an incongruence between the mitochondrial gene tree and the organismal phylogeny caused by incomplete mitochondrial lineage sorting and/ or introgression across forms. The apparently rapid diversification in this clade of riverine electric fishes and the problems associated with recovering a meaningful species-level phylogeny from mitochondrial data parallel findings in other species flocks. Selection on EOD waveforms as mate recognition signals may be involved in the radiation of these fishes. This is the first description of a freshwater fish species flock from a riverine, as opposed to a lacustrine, environment. PMID:11989689

  20. Petroscirtes pylei, a new saber-toothed blenny from the Fiji Islands (Teleostei: Blenniidae)

    Science.gov (United States)

    Smith-Vaniz, W.F.

    2005-01-01

    Petroscirtes pylei is described from three specimens, 20.3-40.9 mm SL, obtained from a deep-water reef off Suva, Viti Levu, Fiji Islands. It is distinguished from all other congeners by its color pattern, including the presence of two dark body stripes, the lower one broadly extending onto the anal fin, and the dorsal fin with a broad, dark basal stripe, superimposed by a conspicuous white spot centered on the 4th spine. Among Petroscirtes, only the new species and P. springeri typically have 12 dorsal-fin spines but they are not closely related. The holotype was collected in 104-110 m, the second deepest depth record for a species of Petroscirtes. Discovery of this new species, and an apparently second new deep-water Petroscrites (uncollected), at a different Fijian reef indicates that our knowledge of the biodiversity of this habitat and of the saber-toothed blennies is very incomplete. Copyright ?? 2005 Magnolia Press.

  1. Skin toxins in coral-associated Gobiodon species (Teleostei: Gobiidae) affect predator preference and prey survival

    OpenAIRE

    Gratzer, Barbara; Millesi, Eva; Walzl, Manfred; Herler, Juergen

    2014-01-01

    Predation risk is high for the many small coral reef fishes, requiring successful sheltering or other predator defence mechanisms. Coral-dwelling gobies of the genus Gobiodon live in close association with scleractinian corals of the genus Acropora. Earlier studies indicated that the low movement frequency of adult fishes and the development of skin toxins (crinotoxicity) are predation avoidance mechanisms. Although past experiments showed that predators refuse food prepared with goby skin mu...

  2. Ontogenia y sistemática filogenética de la familia Gerreidae (Teleostei: Percoidei) /

    OpenAIRE

    Ortíz Galindo, José Luis sustentante.

    2009-01-01

     tesis que para obtener el grado de Doctor en Ciencias Biológicas, presenta José Luis Ortíz Galindo ; asesor José Luis Castro Aguirre, Víctor Hugo Reynoso Rosales. xii, 139 páginas : ilustraciones. Doctorado en Ciencias Biológicas UNAM, Facultad de Ciencias, 2009

  3. Evidence of an XX/XY sex chromosome system in the fish Dormitator maculatus (Teleostei, Eleotrididae

    Directory of Open Access Journals (Sweden)

    Claudio Oliveira

    2006-01-01

    Full Text Available The fish Dormitator maculatus has a chromosomes number of 2n = 46, females having a karyotype of 14 M, 28 SM, 2 ST and 2A and males 13 M, 28 SM, 3 ST and 2A. The presence of a heteromorphic pair in the males and a corresponding homomorphic pair in the females suggest the occurrence of an XX/XY sex chromosome system in D. maculatus. The putative X chromosome has a pericentromeric C-band positive segment and the putative Y chromosome a C-band positive short arm.

  4. Diplectanocotyla Yamaguti, 1953 (Monogenea: Diplectanoidea) from Megalops cyprinoides (Broussonet) (Teleostei: Megalopidae) off Peninsular Malaysia.

    Science.gov (United States)

    Lim, L H S; Gibson, D I

    2007-06-01

    Two known and two new species of Diplectanocotyla Yamaguti, 1953 (D. gracilis Yamaguti, 1953, D. megalopis Rakotofiringa & Oliver, 1987, D. langkawiensis n. sp. and D. parva n. sp.) were collected from Megalops cyprinoides (Megalopidae) off Langkawi, Kedah and Matang, Perak, Peninsular Malaysia. All four species possess similar types of sclerotised male and female reproductive structures and similar soft anatomical features. The squamodisc sclerites of all four species have spine-like projections with varying degrees of visibility and shapes (sharp-pointed to triangular). In D. megalopis and D. langkawiensis n. sp. the spines are sharp-pointed and distinct on sclerites from rows 5-6 onwards. In D. gracilis and D. parva n. sp. the sclerite spines are triangular, lightly sclerotised and occur on almost all of the sclerites. D. parva n. sp. has comparatively the smallest set of anchors, bars, squamodiscs and squamodisc suckers. The anchors and bars of the other three species are almost similar in overall size, and the main distinguishing feature is the relative lengths of the inner and outer roots of the ventral anchors. In D. gracilis the outer root is very much smaller than the inner root and they are disposed almost at a right angle to each other. In D. megalopis the outer root is usually about half the length of the inner root and the roots are inclined at c.60 degrees to each other. In D. langkawiensis n. sp. the roots are inclined at c.40 degrees degrees and the outer root is of a similar length or only slightly shorter than the inner root. The openings of the two squamodisc suckers of all four Diplectanocotyla species are surrounded by tiny scale-like spines. Bifid tegumental spines are found in the posterior region of all four species, differing only in their extent: in D. parva n. sp. the tegumental spines are only distributed in the peduncular region and not beyond, whilst in the other three species the tegumental spines extend from the posterior level of the testis to the end of the peduncle. An amended diagnosis of Diplectanocotyla and a key to its species are appended. PMID:17143570

  5. A new stem fossil characid (Teleostei: Ostariophysi from the Eocene-Oligocene of southeastern Brazil

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    Fernanda E. Weiss

    2014-06-01

    Full Text Available A new characiform is herein described from the Eocene-Oligocene sediments exposed in the Aiuruoca basin, in southern Minas Gerais State, Brazil. Recently, two other characid species were described for this same fossil level: †Paleotetra aiuruoca and †Paleotetra entrecorregos. The holotype of this new characiform is represented by an articulated specimen preserved as part and counterpart, in which the most anterior part of the head is missing, including the jaws. Despite the lack of the diagnostic characters from the snout, a unique combination of characters allows its differentiation from other Neotropical characiforms, raising a new genus and species: †Bryconetes enigmaticus. Among these characters are: the presence of a supraorbital, dentary with inflated pentacuspidate teeth arranged in a single row, infraorbital 3 expanded and ornamented with punctuations and grooves, a large anal fin with iii+22-23 rays, and the caudal fin with 11 ventral procurrent rays of which the anteriormost are fused in laminar bones. A phylogenetic analysis using morphological data was performed and recovered †Bryconetes enigmaticus as a stem group to characiforms lacking a supraorbital. Based on the results of this analysis, a discussion of the potential relationships of the new taxon with other characiforms is presented.

  6. Nemacheilus Paucimaculatus, a new species of loach from the Southern Malay Peninsula (Teleostei: Nemacheilidae)

    Czech Academy of Sciences Publication Activity Database

    Bohlen, Jörg; Šlechtová, Vendula

    2011-01-01

    Roč. 59, č. 2 (2011), 201-204. ISSN 0217-2445 R&D Projects: GA ČR GA206/08/0637; GA ČR GA206/05/2556; GA AV ČR IAA600450508 Institutional research plan: CEZ:AV0Z50450515 Keywords : Cobitoidea * Malaysia * Johor Subject RIV: EG - Zoology Impact factor: 1.467, year: 2011

  7. Four new species of Rasbora of the Sumatrana group (Teleostei: Cyprinidae) from northern Sumatra, Indonesia.

    Science.gov (United States)

    Lumbantobing, Daniel N

    2014-01-01

    Four new species of the minnow genus Rasbora of the Sumatrana group, R. arundinata, R. haru, R. maninjau, and R. bindumatoga, are described from northern Sumatra. Rasbora arundinata is distinguished from all congeners in the Sumatrana group by the black midlateral stripe overall forming a reed-leaf-like profile. Rasbora haru differs from its congeners in the Sumatrana group in having the black midlateral stripe overall forming a stamen-like profile. The new species endemic to Lake Maninjau in central west Sumatra, Rasbora maninjau, is unique among all the congeners in the Sumatrana group in having a combination of the black midlateral stripe extending from the midhumeral region of uniform width, the prominent acutely triangular basicaudal blotch, and the oval supra-anal pigmentation. Rasbora bindumatoga is distinguished from all congeners in the Sumatrana group by a combination of the black rectangular subdorsal blotch, the absence of supra-anal pigmentation, and the somewhat oval basicaudal blotch. Rasbora arundinata, R. maninjau, and R. bindumatoga occur allopatrically in the northwestern coastal region of Sumatra, while R. haru is known from northeastern coastal area of Sumatra. A new diagnostic character for the Sumatrana group is described: partial exposure of the upper lip due to a submedial contact between the maxilla and the lower lip, which is marked posteriorly by a lachrymal groove.  PMID:24870277

  8. Insight into the origin of endemic Mediterranean ichthyofauna: phylogeography of Chondrostoma genus (Teleostei, Cyprinidae).

    Science.gov (United States)

    Durand, J-D; Bianco, P G; Laroche, J; Gilles, A

    2003-01-01

    The Chondrostoma genus is widespread in Europe, with numerous endemic species in northern Mediterranean rivers. We reconstructed the phylogenetic relationships of this genus, using the whole cytochrome b sequence and compared the two freshwater fish dispersion hypotheses: (1) dispersion around the Mediterranean Sea during the Lago Mare phase of the Messinian salinity crisis (Bianco's hypothesis) and (2) an older and more gradual colonization of the Mediterranean rivers (Banarescu's hypothesis). All phylogenetic analyses identified two levels of divergences, implying two radiation events in the Chondrostoma genus. The first radiation mainly concerned Mediterranean species, whereas the second one includes Danubian and Mesopotamian species. This phylogeographic pattern was already observed for the genus Squalius, which exhibits a similar geographic range distribution in Europe and probably is shared with several other Mediterranean genera, such as Scardinius, Rutilus, and TELESTES: Furthermore, assuming a molecular clock of 1% per million years, the first radiation appears consistent with a Messinian dispersion during the Lago Mare, 5.3 million years ago, whereas the second one may correspond to a Mesopotamian dispersion through the Black Sea to the Danube system. According to our results, the Lago Mare theory is strengthened, and a more recent and pre-Pleistocene colonization of the Danube from Mesopotamian freshwater fishes is suggested. PMID:12920103

  9. Paleoclimatic history and vicariant speciation in the "sand goby" group (Gobiidae, Teleostei).

    Science.gov (United States)

    Huyse, Tine; Houdt, Jeroen Van; Volckaert, Filip A M

    2004-07-01

    Vicariant and climatic cycling speciation hypotheses of the 'sand gobies' belonging to the genera Pomatoschistus, Gobiusculus, Knipowitschia, and Economidichthys are tested using molecular phylogenies constructed of nuclear DNA (ITS1 locus) and mitochondrial DNA (12S and 16S fragments). These gobies are among the most abundant in the Eastern Atlantic-Mediterranean region, and play an important role in the ecosystem. Considerable ITS1 length differences, primarily due to the presence of several tandem repeats, were found between species and even within individuals. Therefore, phylogenetic analyses focused on fragments of the 12S and 16S mtDNA region that have been sequenced for 16 goby taxa. The 'sand gobies' clustered as a monophyletic group as proposed on morphological grounds. However, G. flavescens, E. pygmaeus, and K. punctatissima clustered within the Pomatoschistus species, pointing to a paraphyletic origin of these genera. Furthermore, the genetic divergence between P. minutus from the Adriatic Sea versus the Atlantic-Mediterranean region was as high as the divergence within the P. minutus complex, suggesting that P. minutus from the Adriatic Sea should be considered as a distinct species. The "star" phylogeny might suggest that these gobies evolved in a very short time period, possibly linked to the drastic alterations in the Mediterranean Sea during and immediately after the Messinian salinity crisis at the end of the Miocene. The freshwater life-style appeared monophyletic; equating its origin with the salinity crisis resulted in a molecular clock estimate of 1.4% divergence per million years. The last common ancestor probably occupied sandy bottoms and a coastal niche while several species subsequently adapted to new habitats (pelagic, freshwater or stenohaline). The origin of the shallowest clades dated back to the glacial cycling during the Pleistocene epoch. PMID:15186817

  10. Molecular evolution of connective tissue growth factor in Cyprinidae (Teleostei: Cypriniformes)

    Institute of Scientific and Technical Information of China (English)

    Xianghui Kong; Xuzhen Wang; Xiaoni Gan; Junbing Li; Shunping He

    2008-01-01

    Connective tissue growth factor (CTGF) plays an important role in regulation ofcell growth, differentiation, apoptosis and individual development in animals. The study of sequences variation and molecular evolution of CTGF gene across various species of the cyprinid could be helpful for understanding of speciation and gene divergence in this kind of fish. In this study, 19 novel sequences of CTGF gene were obtained from the representative species of the family Cyprinidae using PCR amplification, cloning and sequencing. Phylogenetic relationships of Cyprinidae were reconstructed by neighbor-joining (N J), maximum parsimony (MP), maximum likelihood (ML) and Bayesian method. Oryzias latipes from the family Cyprinodontidae was assigned to be the outgroup taxon. Leuciscini and Barbini were clustered into the monophyletic lineages, respectively, with the high nodal supports. The estimation of the ratio of non-synonymous to synonymous substitution (dN/dS) for the various branches indicated that there stood the different evolution rates between the Leuciscini and the Barbini. With the ratio of dN/dS of the Leuciscini being lower than that of the Barbini, species within the Barbini were demonstrated to be subjected to the relatively less selection pressure and under the relaxable evolution background. A 6 bp indel (insertion/deletion) was found at the 5' end of CTGF gene of Cyprinidae, and this 6 bp deletion only appeared in the Leuciscini, which is a typical characteristic of the Leuciscini and provides evidence for the monophylogeny of the Leuciscini. For the amino acid sequences of CTGF protein, the most variations and indels were distributed in the signal region and IGFBP region of this protein, implying that these variations were correlated with the regulation of the CTGF gene expression and protein activity.

  11. Diet of Astyanax species (Teleostei, Characidae in an Atlantic Forest River in Southern Brazil

    Directory of Open Access Journals (Sweden)

    Fábio Silveira Vilella

    2002-06-01

    Full Text Available Feeding habits of six species of Astyanax from river Maquiné are described. Fishes were sampled bi-monthly from November/95 to September/96 in two zones of the river. Items were identified, counted and had their abundance estimated according to a semi-quantitative scale. Frequency of occurrence, alimentary importance index (IFI values and a similarity analysis of diets for each species-river zone sample were examined. All the species were considered typically omnivorous, with insects and vegetal matter being the most important items in their diet. These species could act as seed dispersers, particularly for macrophytes. Intra-specific spatial differences were not observed in comparisons of samples from two diferent regions of the river, except for A. fasciatus. The presence of Podostemaceae macrophytes in the mid-course of the river seemed to be important both as an autochthonous food resource and as habitat for several organisms preyed by the Astyanax species.Seis espécies do gênero Astyanax, presentes no rio Maquiné, RS, foram estudadas quanto aos seus hábitos alimentares. Os exemplares foram amostrados bimensalmente de novembro de 1995 a setembro de 1996 nas zonas ritral e potamal do rio. Os itens alimentares foram identificados e quantificados de acordo com uma escala semi-quantitativa de abundância, utilizando-se para análise a frequência de ocorrência e um índice de importância alimentar para cada espécie e zona do rio. Análises multivariadas de agrupamento e ordenação foram utilizadas para comparar as dietas intra e interespecíficas. Todas as espécies foram consideradas onivoras, sendo que os itens mais importantes foram os insetos e restos de vegetais superiores. Sugere-se que as espécies estudadas possam atuar como dispersoras de sementes, particularmente para macrófitas. Diferenças espaciais intraespecíficas não foram encontradas, exceto para A. fasciatus. A presença de Podostemaceae no curso médio do rio parece ser uma fonte importante de alimento para as espécies, além de servir de refúgio para diversos organismos que são predados por Astyanax sp.

  12. Diet of Lipophrys pholis (L.) (Teleostei, Blenniidae) in Cantabrian coastal waters (Spain)

    Science.gov (United States)

    Mazé, Raquel A.; Domínguez, Josefa; Pérez-Cardenal, David

    1999-07-01

    Between February and December 1988, a total of 261 specimens of Lipophrys pholis were caught in eleven intertidal pools on the western coast of Asturias. This blenniid species mainly feeds on different groups of invertebrates, although algal remains also appear. Mollusca is the most highly represented taxon with the largest number of prey being Gastropoda, followed by Bivalvia and, to a lesser degree, Polyplacophora. Crustacea is well represented by Cirripedia. Isopoda also stands out and Amphipoda, Tanaidacea and Decapoda appear sporadically. Temporal diet analysis throughout the year shows no great differences. Likewise, a great similarity was observed among the feeding of L. pholis specimens collected in pools at a different tidal level, of variable size and with different algal cover. Changes in diet are appreciable as size increases, especially from a length of 6 cm on.

  13. L'alimentation de Brycinus leuciscus (Teleostei : Characidae) au Mali : aspects qualitatifs, quantitatifs et comportementaux

    OpenAIRE

    Ghazaï, M.A.; Bénech, Vincent; Paugy, Didier

    1991-01-01

    L'alimentation de #Brycinus leuciscus$ a été étudiée dans une mare alimentée par le fleuve Niger près de Bamako. Dans cet habitat, cette espèce possède un régime omnivore dans lequel la quantité de proies allochtones augmente en saison des pluies. Elle se nourrit surtout durant la photophase. Des observations en aquarium montrent que la détection des proies est essentiellement visuelle. Le rythme alimentaire nycthéméral semble modulé par la lunaison, la réplétion stomacale étant plus faible d...

  14. New species of Freitascapillaria (Nematoda: Capillariidae) from the intestine of Cottus caeruleomentum (Teleostei: Cottidae) in Maryland

    Czech Academy of Sciences Publication Activity Database

    Moravec, František; Muzzall, P.

    2009-01-01

    Roč. 95, č. 4 (2009), s. 987-990. ISSN 0022-3395 R&D Projects: GA ČR(CZ) GA524/06/0170; GA MŠk LC522 Institutional research plan: CEZ:AV0Z60220518 Keywords : Freitascapillaria * Cottus * USA Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 1.195, year: 2009

  15. Discovering Hidden Diversity of Characins (Teleostei: Characiformes) in Ecuador’s Yasuní National Park

    Science.gov (United States)

    Escobar-Camacho, Daniel; Barriga, Ramiro; Ron, Santiago R.

    2015-01-01

    Background Management and conservation of biodiversity requires adequate species inventories. The Yasuní National Park is one of the most diverse regions on Earth and recent studies of terrestrial vertebrates, based on genetic evidence, have shown high levels of cryptic and undescribed diversity. Few genetic studies have been carried out in freshwater fishes from western Amazonia. Thus, in contrast with terrestrial vertebrates, their content of cryptic diversity remains unknown. In this study, we carried out genetic and morphological analyses on characin fishes at Yasuní National Park, in eastern Ecuador. Our goal was to identify cryptic diversity among one of the most speciose fish families in the Amazon region. This is the first time that genetic evidence has been used to assess the species content of the Napo Basin, one of the richest regions in vertebrate diversity. Results Phylogenetic analyses of partial mitochondrial 16S ribosomal RNA gene (∼600 pb) DNA sequences from 232 specimens of the family Characidae and its closest groups revealed eight candidate new species among 33 species sampled, representing a 24% increase in species number. Analyses of external morphology allowed us to confirm the species status of six of the candidate species. Conclusions Our results show high levels of cryptic diversity in Amazonian characins. If this group is representative of other Amazonian fish, our results would imply that the species richness of the Amazonian ichthyofauna is highly underestimated. Molecular methods are a necessary tool to obtain more realistic inventories of Neotropical freshwater fishes. PMID:26275041

  16. The complete mitochondrial genome organization of Schizothorax Plagiostomus (Teleostei: Cyprinidae) from Northern Pakistan.

    Science.gov (United States)

    Fiaz Khan, Muhammad; Nasir Khan Khattak, Muhammad; He, Dekui; Liang, Yangyang; Li, Chunhua; Ullah Dawar, Farman; Chen, Yifeng

    2016-09-01

    Schizothorax plagiostomus, a fresh water fish, is an economically important fish of Pakistan. In this study, the complete mitochondrial DNA (mtDNA) sequence of S. plagiostomus was explored. The mitogenome length was found to be 16 563bp with 13 protein-coding genes, 22 tRNA genes, 2 rRNA genes and 2 non-coding regions: origin of light-strand replication (OL) and control region (D-loop). All genes were encoded on the heavy strand except ND6 and few tRNA genes. The overall base composition of S. plagiostomus of the heavy strand was T 25.5%, C 27.0%, A 29.8% and G 17.8%, A + T content 55.3% and G + C content 44.7%. The phylogenetic tree suggests that S. esocinus, S. progastus, S. richardsonii and S. plagiostomus may have closer affinities than other fish of the genus Schizothorax. This mitogenome sequence would be useful for phylogenetic analysis and conservation of this species in Pakistan. PMID:26369352

  17. Boxfishes (Teleostei: Ostraciidae) as a model system for fishes swimming with many fins: kinematics

    OpenAIRE

    Hove, J. R.; O'Bryan, L. M.; Gordon, M.S.; Webb, P. W.; Weihs, D.

    2001-01-01

    Swimming movements in boxfishes were much more complex and varied than classical descriptions indicated. At low to moderate rectilinear swimming speeds (5 TL s^(-1)) was characterized by the use of a caudal burst-and-coast variant. Adduction was always faster than abduction in the pectoral fins. There were no measurable refractory periods between successive phases of the fin movement cycles. Dorsal and anal fin movements were synchronized at speeds greater than 2.5 ...

  18. New approach data in electric fish (Teleostei: Gymnotus): sex chromosome evolution and repetitive DNA.

    Science.gov (United States)

    da Silva, Maelin; Matoso, Daniele Aparecida; Artoni, Roberto Ferreira; Feldberg, Eliana

    2014-12-01

    Antagonist sexual selection is the driving force behind the origin and diversification of sex chromosomes such as XX/XY and ZZ/ZW. However, chromosome mobility, mainly in fishes, may result in the formation of chromosomes of recent origin, a process known as turnover. The family Gymnotidae, which is composed of the genera Electrophorus+Gymnotus, presents a multiple system of the type X1X1X2X2/X1X2Y, which has been described for Gymnotus pantanal. This article describes the karyotype of three Amazon Gymnotus species, revealing the presence of both simple and multiple systems: Gymnotus carapo "Catalão" 2n=40 XX/XY, Gymnotus coropinae 2n=49♂/50♀ X1X1X2X2/X1X2Y, and Gymnotus sp. "Negro" 2n=50 XX/XY. Our hypothesis is that the simple system present in G. carapo "Catalão" is ancestral in relation to G. pantanal's multiple system and that the diversification of the subsequent multiple system occurred after the final separation of the Amazon and Paraná basins. Moreover, G. coropinae's multiple system may have originated from the simple system present in Gymnotus sp. "Negro." The distant position between the species in the Gymnotidae family's phylogeny in addition to differences in sex chromosome formula and number between Clade G1 G. coropinae and G. sp. "Negro" species and "Carapo" Clade. G. carapo and G. pantanal species suggest that both sequences of sexual systems occurred independently, supporting other proposed models and highlighting the fact that species of the genus Gymnotus may serve as a model for studying sex chromosome turnover. PMID:25264714

  19. Nemachilichthys ruppelli (Teleostei: Nemacheilidae) and the proper correction of the German umlaut.

    Science.gov (United States)

    Kullander, Sven

    2016-01-01

    In a re-description of the South Asian fish species Nemachilichthys ruppelli (Sykes, 1839a) Keskar et al. (2015) noticed-as also pointed out by Kottelat (2012)-that the original spelling of the species name was rupelli [actually: Rupelli, with regular font and capital R], but that information in Sykes (1839a: 162) showed clearly that the species was named for [Eduard] Rüppell with the explicit dedication "I have dedicated this beautiful little fish to Rüppell, who did me the favor to look over my drawings ..." Rüppell is also mentioned twice on page 159. Sykes's (1839a) paper was reprinted in Sykes (1839b) with exactly the same spelling, but there the species name appears in italics. A third publication by Sykes (1841), based on the same material, also uses the spelling Rupelli for the species, but does not mention Rüppell. PMID:27394900

  20. Corrigendum: Redescription of Nemachilichthys rueppelli, a senior synonym of N. shimogensis (Teleostei: Nemacheilidae).

    Science.gov (United States)

    Keskar, Ashwini; Kumkar, Pradeep; Katwate, Unmesh; Ali, Anvar; Raghavan, Rajeev; Dahanukar, Neelesh

    2016-01-01

    In Keskar et al. (2015) we emended the original name Cobitis rupelli Sykes, 1839, because Sykes (1839) specifically mentions that the species was named after Rüppell. The specific epithet 'rupelli', with a single 'p', is an incorrect original spelling and should be emended into 'ruppelli' as required by Article 32.5 (International Commission on Zoological Nomenclature, 1999). However, citing Art 32.5.2.1, we also suggested that because Sykes (1839) named the species after Rüppell, the umlaut 'ü' should be corrected to 'ue' and that the specific epithet should thus be 'rueppelli'. This is an error. Sykes (1839) did not use 'ü' in the original spelling of the species epithet rupelli: hence changing it to 'ue' is incorrect. Therefore, the correct spelling for the species should be 'Nemachilichthys ruppelli', a change that should be reflected in the title and in the rest of the text of Keskar et al. (2015). PMID:27394901

  1. Age and growth estimation of bigeye tuna, Thunnus obesus (Teleostei: Scombridae in the southwestern Atlantic

    Directory of Open Access Journals (Sweden)

    Paulo Duarte-Neto

    2012-01-01

    Full Text Available The purpose of the current study was to supply the first information on age and growth for Thunnus obesus caught in the equatorial south-western Atlantic using dorsal spines, an approach that has been successfully employed for ageing tuna species. The study was conducted using a multi-model inference based on information theory for back-calculated and observed length-at-age data. Uncertainty associated with the parameter estimation was verified and results were compared to other accounts on the species, considering both the statistical and methodological contexts. Samples were collected in Natal city (Rio Grande do Norte State, Brazil from February 1999 to January 2000, of tuna vessels and from surveys, aimed at providing information on the Brazilian Exclusive Economic Zone (EEZ in the area around São Pedro and São Paulo Archipelago. Validation using marginal increment indicated that one ring is deposited per year. Mean length-at-age ranged of 54.3 to 177.5 cm (fork length for ages 1 to 9 years. Von Bertalanffy, Richards, and Gompertz models were considered suitable for the bigeye tuna. Hence, the model-averaged asymptotic length ¯L∞ was estimated. The averaged model generated in the present study by back-calculation was considered appropriate for describing the growth of T. obesus.A proposta do presente estudo foi fornecer a primeira informação sobre idade e crescimento de Thunnus obesus, capturado no Atlântico sudoeste equatorial usando espinhos dorsais, uma abordagem que tem sido utilizada com sucesso na determinação de idade de espécies de atuns. O estudo foi conduzido usando uma inferência de multi-modelos baseada na teoria de informação avaliada para dados de comprimento por idade retrocalculados e observados. Incertezas associadas aos parâmetros foram verificadas e os resultados foram comparados aos de outros estudos realizados para esta espécie, considerando os contextos estatísticos e metodológicos. As amostras foram coletadas na cidade de Natal (estado do Rio Grande do Norte, Brasil de fevereiro de 1999 a janeiro de 2000, provenientes de embarcações comerciais e também prospecções, cujo objetivo foi prover informações sobre a Zona Econômica Exclusiva (ZEE na área do entorno do Arquipélago de São Pedro e São Paulo. A validação usando incremento marginal indicou a deposição de um anel anual. Os comprimentos médios por idade variaram entre 54.3 a 175.7 cm (comprimento furcal para idades de 1 a 9 anos. Os modelos Von Bertalanffy, Richards e Gompertz foram considerados adequados para a albacora bandolim e, desta forma, o comprimento assintótico para um modelo médio (¯L∞ foi estimado. O modelo médio gerado no presente estudo a partir dos comprimentos retrocalculados foi considerado apropriado para descrever o crescimento de T. obesus capturada no Atlântico.

  2. Age and growth estimation of bigeye tuna, Thunnus obesus (Teleostei: Scombridae) in the southwestern Atlantic

    OpenAIRE

    Paulo Duarte-Neto; Fábio M. Higa; Rosangela P. Lessa

    2012-01-01

    The purpose of the current study was to supply the first information on age and growth for Thunnus obesus caught in the equatorial south-western Atlantic using dorsal spines, an approach that has been successfully employed for ageing tuna species. The study was conducted using a multi-model inference based on information theory for back-calculated and observed length-at-age data. Uncertainty associated with the parameter estimation was verified and results were compared to other accounts on t...

  3. Origin of Gymnocypris przewalskii and phylogenetic history of Gymnocypris eckloni (Teleostei: Cyprinidae)

    Institute of Scientific and Technical Information of China (English)

    Zhao Kai; Duan Ziyuan; Yang Gongshe; Peng Zuogang; He Shunping; Chen Yiyu

    2007-01-01

    The origins and phylogenetic patterns were assessed for G. przewalskii and G. eckloni by analyzing the complete mtDNA cytochrome b gene sequence (1140bp). Phylogenetic analyses further supported that there were three mtDNA lineages (A-C) identified in G. przewalskii and G. eckloni, demonstrating that outer rakers of the first gill have little significance in the phylogeny of the Gymnocypris fishes. The network established showed that G. eckloni of the Yellow River specific haplotype A1 was a founder and it radiated all haplotypes of G. przewalskii which suggested G. przewalskii might only originate from one of two maternals of G. eckloni from the Yellow River. Fs test and mismatch analysis showed at least two expansion events in the population of G. przewalskii about 0. 2734 Ma and 0. 0658 Ma, while G. eckloni from Qaidam Basin could have experienced severe bottleneck effect about 0. 0693 Ma. The population expansion was detected in subclades A1 and A21 with the most recent common ancestor (TMRCA) about 0. 2308 ± 0.01 Ma and 0.1319 ± 0. 015 Ma, respectively, which were within the geological age range of "Conghe Movement" event that caused the separation of Lake Qinghai from the upper Yellow River. These results suggested the effect of the fish diversification by rapid uplift of the Qinghai-Tibetan Plateau in the Late Pleistocene.

  4. Development of free neuromasts in Engraulis ringens and Strangomera bentincki (Teleostei, Clupeiformes early larvae

    Directory of Open Access Journals (Sweden)

    Alejandra Llanos-Rivera

    2014-03-01

    Full Text Available Neuromast morphology and distribution are characterized during early ontogeny of anchoveta (Engraulis ringens and common sardine (Strangomera bentincki. Although both species share morphological features, they show several differences during their early ontogeny, such as size at hatching and yolk absorption. Larvae were obtained from incubation of planktonic eggs (at 12°C, collected during the spawning season 2001 (August-September at Coliumo Bay. The neuromasts were observed from hatching to 25 days, and the pattern of neuromast appearance, in newly hatched larva, until yolk absorption, was determined using Janus Green staining and scanning electronic microscope. Results showed a similar pattern of neuromast development in both species. At hatching, two pairs of neuromasts were observed in the cephalic area and 8-9 in the rest of the body, which increased to 19 pairs and to 30-39 pairs at a larval size of 11 mm, respectively. On the average, 12 hair cells per neuromast were counted, with little variation among neuromasts. The polarity of these hair cells was closest to multiple polarity. Neuromast positioning for both species, anchoveta and common sardine larvae, are similar to those of Engraulis mordax and Clupea harengus, respectively. The similar development pattern of these species seems to be related to similar functional constraints and close taxonomic affinity.

  5. Two new species of the genus Cobitis Linnaeus (Teleostei: Cobitidae) from southern China

    Science.gov (United States)

    Chen, Yongxia; Sui, Xiaoyun; Liang, Na; Chen, Yifeng

    2016-05-01

    Two new species of the genus Cobitis from southern China, C. hereromacula from the Luohe River in Guangdong Province and C. baishagensis from the Nandujiang River in Hainan Province, are described and illustrated here. C. hereromacula can be distinguished from its congeners by possessing the following combination of characteristics: absence of the second and third pigmentary zones of Gambetta; 13-16 oval blotches on the dorsum and 10-13 vertical, elongated triangular blotches below the midlateral line with more than 20 vertical dark brown bars between them; 6-7 narrow rows of dark spots on the caudal fin; a vertical oval spot smaller than the eye diameter on the upper part of the caudal peduncle; pointed mental lobes of the lower lip pointed with a slightly filiform tip; one slender and long needle-shaped lamina circularis at the base of the first branched ray of the male pectoral fins. C. baishagensis can be distinguished from its congeners by the fourth Gambetta zone being covered by 10-12 transverse elongated blotches; 4-5 narrow rows of dark spots on the caudal fin; a vertical blotch smaller than the eye diameter on the upper part of the caudal peduncle; males with a slender and long needle-shaped lamina circularis at the second branched pectoral fin ray in males; large scales with a slightly large focal zone; undeveloped mental lobes with a lower lip that does not end posteriorly in a filiform tip.

  6. Atlantic-Mediterranean and within-Mediterranean molecular variation in Coris julis (L. 1758) (Teleostei, Labridae)

    OpenAIRE

    Fruciano, Carmelo; Hanel, Reinhold; Debes, Paul V.; Tigano, Concetta; Ferrito, Venera

    2011-01-01

    Sequence variation in the mitochondrial control region was studied in the Mediterranean rainbow wrasse (Coris julis), a species with pronounced pelagic larval phase inhabiting the Mediterranean Sea and the adjacent coastal eastern Atlantic Ocean. A total of 309 specimens from 19 sampling sites were analysed with the aim of elucidating patterns of molecular variation between the Atlantic and the Mediterranean as well as within the Mediterranean Sea. Phylogeographic analyses revealed a pronounc...

  7. Population characteristics, space use and habitat associations of the seahorse Hippocampus reidi (Teleostei: Syngnathidae

    Directory of Open Access Journals (Sweden)

    Ierecê Lucena Rosa

    2007-09-01

    Full Text Available This paper provides a case study of a threatened seahorse species, Hippocampus reidi, highlighting the importance of using ecological information to assist conservation and management initiatives. Underwater visual sighting data (50 x 2m transect gathered along the NE, SE and S portions of the Brazilian coast revealed an unequal distribution across localities, perhaps related to harvesting pressure, and a mean density of 0.026 ind.m-2. Our findings suggest some restricted spatial use by H. reidi, which was consistent with its estimated home range, and with re-sighting of specimens. Reproduction was recorded year-round, however productive peaks may exist. Components of habitat structure mostly used as anchoring points were mangrove plants, macroalgae, cnidarians, seagrass, sponges, and bryozoans. Conservation recommendations include: further characterization and mapping of habitats; assessment of availability and condition of microhabitats in selected areas, and studies on dispersal routes during initial life stages.Neste artigo apresenta-se um estudo de caso de uma espécie ameaçada de cavalo-marinho, Hippocampus reidi, enfatizando a importância de utilizar informações ecológicas nas ações de conservação e manejo. Dados de censo visual (transectos de 50 x 2m obtidos nas porções NE, SE e S da costa brasileira revelaram uma distribuição heterogênea entre as localidades, talvez relacionada à pressão de coleta, e uma densidade média de 0.026 ind.m-2. Os resultados sugerem limitação no uso do espaço por H. reidi (consistente com a área vital estimada e com a re-avistagem de exemplares e que a reprodução ocorre o ano inteiro, embora com possíveis picos. Os componentes da estrutura do habitat mais freqüentemente utilizados como pontos de ancoragem pelos cavalos-marinhos foram vegetação de mangue, macroalgas, cnidários, capim marinho e briozoários. Recomendações conservacionistas incluem caracterização adicional e mapeamento de habitats; avaliação da disponibilidade e condição dos microhabitats em áreas selecionadas, e estudos sobre rotas de dispersão durante as fases iniciais de vida.

  8. Stable isotope evidence for trophic overlap of sympatric Mexican Lake Chapala silversides (Teleostei: Atherinopsidae: Chirostoma spp.

    Directory of Open Access Journals (Sweden)

    Norman Mercado-Silva

    2015-06-01

    Full Text Available We explore the trophic role that a diverse sympatric group of fishes in the genus Chirostoma play in a large, shallow lake in central Mexico, Lake Chapala. We use δ13C and δ15N stable isotope - based food web analyses to explore how they relate to other components of the Lake Chapala ecosystem. We find five Chirostoma species in top trophic levels of the Chapala food web compared to other fishes, relying on a combination of zooplankton, fish and benthic resources as energy sources. Food web metric analyses showed generally overlapping trophic niches for members of Chirostoma, especially in terms of δ13C. However, C. jordani had lower mean δ15N isotopic values than C. promelas. As a group, "pescados blancos" (C. sphyraena and C. promelas also had higher δ15N signatures than "charales" (C. consocium, C. jordani and C. labarcae reflecting greater piscivory, but these differences were not strong for all food web metrics used. Trophic overlap among species of Chirostoma in Lake Chapala raises questions about the forces that might have led to a morphologically diverse but functionally similar and monophyletic group of species.

  9. A further note on the identity of Barbus mussullah Sykes (Teleostei: Cyprinidae)  .

    Science.gov (United States)

    Knight, J D Marcus; Rai, Ashwin; D'souza, Ronald K P

    2014-01-01

    Knight et al. (2013a) clarified the identity of Barbus mussullah Sykes, the type species of Hypselobarbus Bleeker, showing it to represent a lineage clearly distinct from Tor Gray (type species Tor hamiltonii Gray (= Cyprinus tor Hamilton)). They showed the two species to be distinguished by a suite of characters, with Hypselobarbus lacking the distinctive median fleshy lobe of the lower lip (present in T. tor), having the last simple ray of the dorsal fin weak (vs. strong, 'osseous'), gill rakers long and branched (vs. short and simple, unbranched) on first gill arch, and the proximal end of the fifth ceratobranchial hooked (vs. only slightly curved). Nevertheless, some subsequent authors (e.g., Ambili et al. 2014; Khare et al. 2014) have persisted in referring Barbus mussullah to Tor, in effect synonymyzing Hypselobarbus (in which 12 species are currently recognized) with Tor and thereby causing confusion with regard to the identities of these groups of fishes which, being large and relatively common cyprinids, are of significant economic importance.  PMID:24989742

  10. Three new species of blood flukes (Digenea: Aporocotylidae) infecting pufferfishes (Teleostei: Tetraodontidae) from off Bali, Indonesia.

    Science.gov (United States)

    Yong, R Q-Y; Cutmore, S C; Bray, R A; Miller, T L; Semarariana, I W Y; Palm, H W; Cribb, T H

    2016-10-01

    We describe three new species of blood flukes (Aporocotylidae) and propose their classification within the genus Psettarium Goto & Ozaki, 1929. All three species were collected from the circulatory systems of pufferfishes caught off Bali, central Indonesia. Psettarium pulchellum n. sp. was found in the gills of both the narrow-lined puffer (Arothron manilensis de Procé) and the spiny blaasop (Tylerius spinosissimus Regan), while P. ogawai n. sp. and P. jimbaranense n. sp. were found in the gills of the reticulated puffer (Arothron reticularis Bloch & Schneider). The morphological characteristics of these taxa necessitated emendation of the diagnosis for the genus Psettarium, to accommodate the presence of an oral sucker, multiple or entirely post-caecal testes and a degenerate posterior testis. Features such as proportion of body length occupied by the oesophagus, and posterior caeca being ≥7× the length of anterior caeca, are no longer regarded as useful genus-level characters. Additionally, Sasala nolani is reassigned to this genus as Psettarium nolani n. comb. In phylogenetic analyses of the 28S and ITS2 rDNA regions, all three new taxa form a well-supported clade, together with Psettarium sinense and Psettarium nolani n. comb., the two other species of tetraodontid-infecting aporocotylids for which comparative rDNA data were available. The short branch lengths within this clade, despite dramatic morphological differences between the five species, suggest that rapid morphological diversification has occurred among the tetraodontid-infecting aporocotylids. The genus Psettarium has long been considered problematic. Further commentary is given on the history of this genus and how the issues presented might be resolved. PMID:27208886

  11. Parasitofauna study of the brown trout, Salmo trutta (Pisces, Teleostei from Corsica (Mediterranean island rivers

    Directory of Open Access Journals (Sweden)

    Quilichini Y.

    2007-09-01

    Full Text Available Corsica is a mediterranean island characterised by a great number of rivers. Salmonides are the main fishes which populate these rivers. Very appreciated by fishermen, Salmonides are represented by three species in the insular hydrographical network, among which an autochthonous species, the brown trout (Salmo trutta. In the present work, we have analysed the parasitofauna of this species. According to our knowledge, this research has never been carried out in Corsica. In a first step, we drew up an inventory of the parasites found in this freshwater fish. In a second step, we studied the differences which appeared in the composition of parasite communities of this species.

  12. First report on the spawning behaviour of a golden spined loach, Sabanejewia vallachica (Teleostei: Cobitidae)

    Czech Academy of Sciences Publication Activity Database

    Bohlen, Jörg

    2008-01-01

    Roč. 57, 1-2 (2008), s. 139-146. ISSN 0139-7893. [International Conference Loaches of the genus Cobitis and related genera. Šibenik, 24.09.2006-29.09.2006] R&D Projects: GA ČR GA206/05/2556; GA AV ČR IAA600450508 Institutional research plan: CEZ:AV0Z50450515 Keywords : ecology * reproduction * freshwater fish Subject RIV: EG - Zoology Impact factor: 0.522, year: 2008

  13. Pseudolimia n. gen., a new monotypic genus for Limia heterandria Regan, 1913 (Teleostei: Poeciliidae)

    NARCIS (Netherlands)

    Poeser, Fred N.

    2002-01-01

    A new genus, Pseudolimia n. gen. is established for the South American Limia heterandria Regan, 1913. It is compared in an anatomical analysis with several nominal taxa of the tribe Poeciliini. Based on number and shape of the gonapophyses, Pseudolimia n. gen. is assigned to the tribe Poeciliini.

  14. Chromosomal Diversification Higher Than Molecular Variation in Astyanax aff. fasciatus (Teleostei, Characidae).

    Science.gov (United States)

    Kavalco, Karine Frehner; Pazza, Rubens; Brandão, Karina de Oliveira; Garcia, Caroline; Bertollo, Luiz Antonio Carlos; de Almeida-Toledo, Lurdes Foresti

    2016-08-01

    Comprising a large number of species, the genus Astyanax has been intensively studied by several approaches to elucidate its evolutionary relationships. Such studies have demonstrated that many nominal species are artificial clusters where distinct taxa are grouped under the same denomination. Astyanax aff. fasciatus stands out due to its high karyotypic diversity, since cytogenetic studies have reported three standard cytotypes (2n = 46, 48, and 50), as well as cases of sympatry between cytotypes, variant cytotypes, and B chromosomes. In this study, we attempted to evaluate the reliability of the chromosomal differences in relation to the analysis of the ATPase6/8 mitochondrial DNA (mtDNA) sequence, thereby providing subsidies to the evolutionary reconstruction of this group. Nine populations from four distinct hydrographic basins along Southeastern Brazil were analyzed. These are the first cytogenetic data collected for four of them. Fluorescent in situ hybridization with 5S rDNA probe evidenced the presence of a standard phenotype for the group and the existence of a new arrangement in the individuals from Ribeira de Iguape River. Besides the karyotypic variation, the genetic distance was low among the studied populations and some aspects of the evolutionary relationships among distinct cytotypes/populations could be ascertained by phylogeographic studies. The incipient molecular structuring of certain cytotypes in different hydrographic basins indicates the role of different evolutionary processes on the diversification of the group. PMID:27148810

  15. Juvenile Thalassoma amblycephalum Bleeker (Labridae, Teleostei) dwelling among the tentacles of sea anemones

    DEFF Research Database (Denmark)

    Arvedlund, Michael; Iwao, Kenji; Brolund, Thea Marie;

    2006-01-01

    each) of the juvenile wrasse Thalassoma amblycephalum dwelling among the tentacles of the two sea anemones Entacmaea quadricolor (clonal type), and Heteractis magnifica at a coral reef in southern Japan during 16 months in daylight hours. There are only two past records of this facultative association......, one from east Africa and one from Indonesia. The wrasse remained close to and was occasionally in physical contact with the host when foraging amongst the tentacles. When frightened, they took shelter among corals, away from the host anemone. The wrasse co-existed with the anemonefishes Amphiprion...

  16. Phylogeny and historical biogeography of trans-Andean cichlid fishes (Teleostei: Cichlidae)

    Czech Academy of Sciences Publication Activity Database

    Musilová, Zuzana; Říčan, O.; Říčanová, Š.; Janšta, P.; Gahura, O.; Novák, J.

    2015-01-01

    Roč. 65, č. 3 (2015), s. 333-350. ISSN 1864-5755 R&D Projects: GA MŠk LC06073 Institutional support: RVO:67985904 Keywords : Andean uplift * Andinoacara * Mesoheros Subject RIV: EG - Zoology Impact factor: 0.593, year: 2014

  17. MATE CHOICE IN AIDABLENNIUS-SPHYNX (TELEOSTEI, BLENNIIDAE) - FEMALES PREFER NESTS CONTAINING MORE EGGS

    NARCIS (Netherlands)

    KRAAK, SBM; VIDELER, JJ

    1991-01-01

    Criteria for female mate choice were investigated in a natural population of a Mediterranean blenny, Aidablennius sphynx. Removable test tubes in concrete blocks were offered as nests. Each tube was guarded by a male and females laid eggs in the tubes. Nests with larger broods received significantly

  18. Microsatellite variation and genetic structuring in Mugil liza (Teleostei: Mugilidae) populations from Argentina and Brazil

    Science.gov (United States)

    Mai, Ana C. G.; Miño, Carolina I.; Marins, Luis F. F.; Monteiro-Neto, Cassiano; Miranda, Laura; Schwingel, Paulo R.; Lemos, Valéria M.; Gonzalez-Castro, Mariano; Castello, Jorge P.; Vieira, João P.

    2014-08-01

    The mullet Mugil liza is distributed along the Atlantic coast of South America, from Argentina to Venezuela, and it is heavily exploited in Brazil. We assessed patterns of distribution of neutral nuclear genetic variation in 250 samples from the Brazilian states of Rio de Janeiro, São Paulo, Santa Catarina and Rio Grande do Sul (latitudinal range of 23-31°S) and from Buenos Aires Province in Argentina (36°S). Nine microsatellite loci revealed 131 total alleles, 3-23 alleles per locus, He: 0.69 and Ho: 0.67. Significant genetic differentiation was observed between Rio de Janeiro samples (23°S) and those from all other locations, as indicated by FST, hierarchical analyses of genetic structure, Bayesian cluster analyses and assignment tests. The presence of two different demographic clusters better explains the allelic diversity observed in mullets from the southernmost portion of the Atlantic coast of Brazil and from Argentina. This may be taken into account when designing fisheries management plans involving Brazilian, Uruguayan and Argentinean M. liza populations.

  19. A new species of Gymnogeophagus Miranda Ribeiro from Uruguay (Teleostei: Cichliformes

    Directory of Open Access Journals (Sweden)

    Marcelo Loureiro

    2016-01-01

    Full Text Available ABSTRACT We describe a new species of a substrate-brooding Gymnogeophagus , based on coloration characters. The new species can be distinguished from the remaining substrate-brooding species in the genus by the unique pigmentation of the dorsal fin which consists of light blue, diagonal stripes over a red background in the spiny section and a combination of round, elliptic, and elongated bright blue spots over a red background in the soft section. It can be further distinguished from all other species of Gymnogeophagus by the following combination of characters: a discontinuous bright blue band above the upper lateral line in the humeral area, light blue roundish spots over a red to orange background on the anal fin, and conspicuous bright blue horizontal bands on body. The new species inhabits a wide range of freshwater habitats in the lower rio Uruguay basin, Rio de la Plata coastal drainages and Atlantic Ocean coastal drainages in Uruguay.

  20. Redescription of Astyanax erythropterus (Holmberg, 1891 (Teleostei: Characiformes: Characidae from La Plata basin in Argentina

    Directory of Open Access Journals (Sweden)

    Paula Soneira

    2010-01-01

    Full Text Available Astyanax erythropterus (Holmberg, 1891 originally described on the basis of one juvenile, is redescribed herein based on juveniles and adults from the type-localiy. The species differs from its congeners by the combination of 11-13 transverse rows scales above lateral line and 8-10 rows below lateral line; 49-54 perforated scales in the lateral series; iii-v,38-42 anal-fin rays, and dorsal, anal and caudal fins vermilion red in juveniles. The vermilion red coloration of unpaired fins in juveniles of Astyanax is only known in A. correntinus.Astyanax erythropterus (Holmberg, 1891 originalmente descripta sobre la base de un ejemplar juvenil, es redescripta en base a ejemplares juveniles y adultos de la localidad tipo. La especie se diferencia de sus congéneres por la combinación de 11-13 hileras de escamas transversas por encima de la línea lateral y 8-10 hileras debajo de la línea lateral; 49-54 escamas perforadas en las serie lateral; iii-v,38-42 radios en la aleta anal y juveniles con las aletas dorsal, anal y caudal rojo bermellón. Aletas impares rojo bermellón en ejemplares juveniles de Astyanax son solo conocidas en A. correntinus.

  1. Preliminary field study of hepatic porphyrin profiles of Astyanax fasciatus (Teleostei, Characiformes) to define anthropogenic pollution.

    Science.gov (United States)

    Carrasco-Letelier, Leonidas; Eguren, Gabriela; de Mello, Franco Teixeira; Groves, Phillip A

    2006-03-01

    The implementation of eco-toxicological assessment in South America is presently limited due to significant scientific information gaps concerning native species and their potential use as biomarkers. Recently, a common southern hemisphere fish species, Astyanax fasciatus, has been pointed out as a potential bio-indicator to anthropogenic pollution. This is a small, abundant, Neotropical characid, which is widely distributed from Central America south, to the Rio de la Plata Basin of western Uruguay. Our study found a statistically significant increase of coproporphyrin, uroporphyrin and protoporphyrin concentrations in hepatic tissues of A. fasciatus collected from a stream segment with high anthropogenic disturbance (due mainly to agricultural derivatives and motor vehicle transportation activities). Although the area studied showed differences in up and downstream limno-chemical parameters, these differences were not related to the increase of hepatic porphyrin concentrations. Based on the results of our study, we conclude that A. fasciatus is a good bio-indicator of exposure to environmental contaminants, and we propose that this abundant fish species be considered as a sentinel organism for monitoring potential disturbances to freshwater ecosystems. PMID:16153685

  2. Feeding ecology of Lutjanus analis (Teleostei: Lutjanidae from Abrolhos Bank, Eastern Brazil

    Directory of Open Access Journals (Sweden)

    Matheus Oliveira Freitas

    2011-06-01

    Full Text Available Diet and feeding ecology of the mutton snapper Lutjanus analis were investigated in the Abrolhos Bank, Eastern Brazil, the largest and richest coral reefs in the South Atlantic, where about 270 species of reef and shore fishes occur. To evaluate seasonal and ontogenetic shifts in the diet, specimens of L. analis were obtained through a fish monitoring program in four cities in southern Bahia State, from June 2005 to March 2007. Stomachs from 85 mutton snappers that ranged in size from 18.1 to 74.0 cm TL were examined. Prey were identified to the lowest possible taxon and assessed by the frequency of occurrence and volumetric methods. Variations in volume prey consumption were evaluated using non-metric multi-dimensional scaling ordination, analysis of similarity, and similarity percentage methods. Significant differences in diet composition among size classes were registered, whereas non significant differences between seasons were observed. Considering size-classes, food items consumption showed important variations: juveniles (50.1 cm TL consumed basically fish, mostly Anguiliformes. Lutjanus analis is an important generalist reef predator, with a broad array of food resources and ontogenetic changes in the diet. This snapper species plays an important role on the trophic ecology of the Abrolhos Bank coral reefs.Foram avaliadas a dieta e a ecologia alimentar da cioba Lutjanus analis no Banco dos Abrolhos, Leste do Brasil. O Banco dos Abrolhos abrange os maiores e mais diversos recifes de corais do Atlântico Sul, onde cerca de 270 espécies de peixes recifais e costeiros ocorrem. Para a avaliação das variações sazonais e ontogênicas na dieta, exemplares de L. analis foram obtidos através de um programa de monitoramento em quatro cidades do extremo sul da Bahia, entre junho de 2005 e março de 2007. Estômagos de 85 exemplares com comprimento total variando entre 18,1 e 74,0 cm foram examinados. Os itens alimentares foram identificados até o menor nível taxonômico possível e avaliados através dos métodos de frequência de ocorrência e volumétrico. Variações no consumo das presas foram avaliadas através do método de escalonamento multidimensional não-métrico e métodos de análise de similaridade e percentagem de similaridade. Diferenças significativas na dieta foram observadas entre as classes de tamanho, porém estas não foram detectadas entre as estações do ano. Considerando as classes de tamanho, os itens consumidos apresentaram importantes variações: os juvenis (50,1 cm CT consumiram basicamente peixes, principalmente Anguiliformes. Lutjanus analis é um importante predador recifal generalista, que consome um amplo espectro de presas, apresentando mudanças ontogênicas na dieta. Esse lutjanídeo desempenha um importante papel na ecologia trófica dos recifes de corais do Banco dos Abrolhos.

  3. Feeding ecology of Lutjanus analis (Teleostei: Lutjanidae) from Abrolhos Bank, Eastern Brazil

    OpenAIRE

    Matheus Oliveira Freitas; Vinícius Abilhoa; Silva, Gisleine Hoffmann da Costa e

    2011-01-01

    Diet and feeding ecology of the mutton snapper Lutjanus analis were investigated in the Abrolhos Bank, Eastern Brazil, the largest and richest coral reefs in the South Atlantic, where about 270 species of reef and shore fishes occur. To evaluate seasonal and ontogenetic shifts in the diet, specimens of L. analis were obtained through a fish monitoring program in four cities in southern Bahia State, from June 2005 to March 2007. Stomachs from 85 mutton snappers that ranged in size from 18.1 to...

  4. Extracellular matrix remodeling of the testes through the male reproductive cycle in Teleostei fish.

    Science.gov (United States)

    Santana, Julio Cesar de Oliveira; Quagio-Grassiotto, Irani

    2014-12-01

    During the fish reproductive cycle, testes undergo morphological changes related to germinal epithelium and remodeling of extracellular matrix components (ECM). ECM is degraded mainly by action of matrix metalloproteinases (MMPs). Due to the natural renewal of ECM in fish testes, we choose Pimelodus maculatus to study remodeling of ECM throughout reproductive cycle, using picrosirius (to identify type I, II, III collagen) and reticulin (type III collagen), and to immunolocalize MT1-MMP (membrane type 1-matrix metalloproteinase) and MMP-2 in testis cells. Testes were classified in four reproductive phases: regenerating, development, spawning capable and regressing. Picrosirius and reticulin demonstrated a differential distribution of total collagen fibers during the reproductive cycle. Immunohistochemistry showed MT1-MMP only in acidophilic granulocyte cells mainly inside blood vessels, in connective tissue of capsule close to the germinal compartment, and also infiltrated in interstitial connective tissue. MMP-2 was detected in fibroblast and endothelial cells of interstitial and capsule blood vessels, in epithelial cells of capsule, and in acidophilic granulocyte cells at same description for MT1-MMP. The fish testes ECM were remodeled throughout reproductive cycle in according to morphophysiological alterations. During reproductive season (spawning capable), the interstitium increased in total collagen fibers (type I, II, III). After spermiation period (regression and regenerating), the amount of collagen fibers decreased in response to action of MMPs on collagen degradation and other interstitial components (not assessed in this study). MMPs seem to be indispensable components for natural cyclic events of ECM remodeling of fish testes and for guarantee tissue homeostasis throughout reproductive cycle. PMID:25142725

  5. Diversity of neotropical electric fish Microsternarchus (Teleostei: Gymnotiformes: Hypopomidae: an electrophysiological and geometric morphometric approach

    Directory of Open Access Journals (Sweden)

    Adília Nogueira

    2015-11-01

    Full Text Available The South American hypopomid electric fish tribe Microsternarchini includes three small species from the Upper Orinoco and Negro rivers. These are placed in monotypic genera: Microsternarchus, Racenisia and Procerusternarchus. Recent collections from tributaries in Negro, Solimões and Amazonas Basins have revealed new specimens of Microsternarchus with significant variations in external morphology and in Electric Organ Discharge parameters (EOD. In order to estimate the diversity within the genus a previous molecular study was done using DNA barcoding, that suggested the presence of multiple Microsternarchus's lineages with high levels of genetic divergence between them. Here we try to determine if the variation in morphology and EOD parameters in the new specimens meet the genetic divergence found. To test the presence of differences in shape among the different lineages we performed a geometric morphometric analysis, which included a relative warp and multivariate analysis on distances between 14 anatomical landmarks defined on the basis of external morphology and homologous among the lineages. The EOD variations were also explored using multivariate analyses of 20 electrophysiological parameters calculated through an algorithm developed in Matlab. The results show that there are significant differences in body shape and EOD in three lineages of Microsternarchus, and the features that contributed most were related to the shape of the head, the coefficient of variation of the signal and the duration and area of the different phases of the pulse. The discrimination of the three lineages confirms the occurrence of new species in the group that are currently being described.

  6. Variations of body geometry in Brycon henni (Teleostei: Characiformes, Bryconidae) in different rivers and streams.

    Science.gov (United States)

    Restrepo-Escobar, N; Hurtado-Alarcón, J C; Mancera-Rodríguez, N J; Márquez, E J

    2016-07-01

    Landmark-based geometric morphometrics were used to evaluate the effect of flow and depth in the water column on the body size and shape of Brycon henni from river and stream populations. The dendrogram showed that stream populations clustered apart and showed significantly smaller centroid size and narrower bodies than river populations, indicating a role for flow and depth on whole body morphometric variation. The results are concordant with morphometric variation described in other fish species and provide the first insights into phenotypic variation in natural populations of B. henni. PMID:27117920

  7. Range extension of Lepidocephalichthys alkaia (Teleostei: Cobitidae) and notes on its sexual dimorphism

    Science.gov (United States)

    ENDRUWEIT, Marco

    2016-01-01

    The natural distributional range of the cobitid loach Lepidocephalichthys alkaia is extended into Yunnan Province,China. The modified sexually dimorphic pectoral fin in males of L. alkaia is described. PMID:27265657

  8. Rivulus berovidesi, a new killifish species (Teleostei: Rivulidae) from western Cuba.

    Science.gov (United States)

    Silva, Rodet Rodriguez

    2015-01-01

    Rivulus berovidesi, a new killifish species, is described from a small stream in Sierra de Cajalbana, northwestern Cuba. It is readily distinguished from Rivulus cylindraceus Poey by the combination of an exclusive color pattern and meristic characters such as a d-type frontal scalation pattern (versus e-type pattern in Rivulus cylindraceus). The current diagnosis of Rivulus berovidesi based on chromatic, morphological and meristic characters is consistent with a recent molecular analysis of this genus in Cuba. PMID:25947808

  9. Microsatellite Development for an Endangered Bream Megalobrama pellegrini (Teleostei, Cyprinidae Using 454 Sequencing

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    Zuogang Peng

    2012-03-01

    Full Text Available Megalobrama pellegrini is an endemic fish species found in the upper Yangtze River basin in China. This species has become endangered due to the construction of the Three Gorges Dam and overfishing. However, the available genetic data for this species is limited. Here, we developed 26 polymorphic microsatellite markers from the M. pellegrini genome using next-generation sequencing techniques. A total of 257,497 raw reads were obtained from a quarter-plate run on 454 GS-FLX titanium platforms and 49,811 unique sequences were generated with an average length of 404 bp; 24,522 (49.2% sequences contained microsatellite repeats. Of the 53 loci screened, 33 were amplified successfully and 26 were polymorphic. The genetic diversity in M. pellegrini was moderate, with an average of 3.08 alleles per locus, and the mean observed and expected heterozygosity were 0.47 and 0.51, respectively. In addition, we tested cross-species amplification for all 33 loci in four additional breams: M. amblycephala, M. skolkovii, M. terminalis, and Sinibrama wui. The cross-species amplification showed a significant high level of transferability (79%–97%, which might be due to their dramatically close genetic relationships. The polymorphic microsatellites developed in the current study will not only contribute to further conservation genetic studies and parentage analyses of this endangered species, but also facilitate future work on the other closely related species.

  10. New insights on early evolution of spiny-rayed fishes (Teleostei: Acanthomorpha

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    Wei-Jen eChen

    2014-10-01

    Full Text Available The Acanthomorpha is the largest group of teleost fishes with about one third of extant vertebrate species. In the course of its evolution this lineage experienced several episodes of radiation, leading to a large number of descendant lineages differing profoundly in morphology, ecology, distribution and behavior. Although Acanthomorpha was recognized decades ago, we are only now beginning to decipher its large-scale, time-calibrated phylogeny, a prerequisite to test various evolutionary hypotheses explaining the tremendous diversity of this group. In this study, we provide new insights into the early evolution of the acanthomorphs and the euteleost allies based on the phylogenetic analysis of a newly developed dataset combining nine nuclear and mitochondrial gene markers. Our inferred tree is time-calibrated using 15 fossils, some of which have not been used before. While our phylogeny strongly supports a monophyletic Neoteleostei, Ctenosquamata (i.e., Acanthomorpha plus Myctophiformes, and Acanthopterygii, we find weak support (bootstrap value < 48% for the traditionally defined Acanthomorpha, as well as evidence of non-monophyly for the traditional Paracanthopterygii, Beryciformes, and Percomorpha. We corroborate the new Paracanthopterygii sensu Miya et al. (2005 including Polymixiiformes, Zeiformes, Gadiformes, Percopsiformes, and likely the enigmatic Stylephorus chordatus. Our timetree largely agrees with other recent studies based on nuclear loci in inferring an Early Cretaceous origin for the acanthomorphs followed by a Late Cretaceous/Early Paleogene radiation of major lineages. This is in contrast to mitogenomic studies mostly inferring Jurassic or even Triassic ages for the origin of the acanthomorphs. We compare our results to those of previous studies, and attempt to address some of the issues that may have led to incongruence between the fossil record and the molecular clock studies, as well as between the different molecular timetrees.

  11. Diet of Ctenogobius shufeldti (Jordan and Eigenmann, 1887 (Teleostei, Gobiidae in Guaratuba Bay, subtropical west Atlantic

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    Diego Zanlorenzi

    2011-02-01

    Full Text Available The diet composition of the American freshwater goby, Ctenogobius shufeldti, was investigated in an estuarine area and two of its tributaries. 397 individuals, total length from 21 to 70mm, were sampled over a period of 12 months and their stomach contents were analysed by the Frequency of Occurrence and Number of Points methods. According to the Alimentary Index, diet was constituted mainly by Ostracoda (IA=50.51 and Tanaidacea (IA=40.85, and secondarily by Gastropoda (IA=1.21, Amphipoda (IA=0.10, Isopoda (IA=0.01, Cirripedia (IA=0.01, Decapoda larvae (IA=0.01, Insecta (IA=0.01, Chlorophyta (IA=2.15 and Rodophyta (IA=0.15 filamentous algae, and plants (IA=4.99. Diversity of diet was higher in rivers than in the Bay. Except for Decapoda larvae, items found in the two rivers were the same. In the Bay, Amphipoda and Cirripedia were not found. Previous to this research, the filamentous algae Chlorophyta and Rodophyta had not been noted in the diet of this species in estuaries close to Guaratuba. In view of this, and regarding the possible roles played by cryptobenthic fish species in aquatic communities (Depczynski and Bellwood, 2003, it is concluded that C. shufeldti takes part in trophic dynamics feeding on benthic organisms as well as on algae, a behaviour that can result from both marine and continental influences existing in the region.

  12. Parasites as biological tags for Eleginops maclovinus (Teleostei: Eleginopidae) around the Falkland Islands.

    Science.gov (United States)

    Brickle, Paul; Mackenzie, Ken

    2007-06-01

    This is the first study of the parasite fauna of Eleginops maclovinus in the Falkland Islands. It was undertaken to catalogue the parasite fauna of E. maclovinus in order to provide a baseline for future studies and to determine whether parasites might be used as biological tags. Between 21 January and 17 March 2002 samples were taken from three stations, Teal Creek (30 fish), Port Louis (30 fish) and Camilla Creek (10 fish), all in East Falkland, and examined for protozoan and metazoan parasites. Twenty-four parasite taxa were recorded, of which three were possible new species, two new host records and five new geographical records. Because of the small number of fish in the Camilla Creek sample it was excluded from further analyses. E. maclovinus is a protandrous hermaphrodite and all fish greater than 53 cm total length were found to be female, so these too were excluded from further analyses. The parasite data from the remaining fish were analysed by an agglomerative hierarchical cluster analysis using an average linkage and a Jaccard measure of similarity, followed by a linear discriminant function analysis (LDA). Both analyses misclassified only one fish from Port Louis as being from Teal Creek, with the LDA giving an overall correct classification of 97.5% (39/40). The results support mechanical tagging data in suggesting that smaller male E. maclovinus are resident in the creeks in which they are caught, and that at this stage of their lives they tend not to migrate over long distances. PMID:17578595

  13. Genetic variability in four samples of Neoplecostomus yapo (Teleostei: Loricariidae from the rio Paranapanema basin, Brazil

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    Juliana S. Philippsen

    2009-03-01

    Full Text Available Four samples of Neoplecostomus yapo were analyzed through the allozyme electrophoresis technique in corn starch gel. The allozyme pattern was similar to those found in N. paranensis with 24 loci scored. Two samples (ribeirão Atlântico and ribeirão Uraí showed monomorphic bands for all 24 loci, whereas the other two (rio Verde and rio Fortaleza showed 8.3% of polymorphic loci. The He genetic variability estimates for the rios Verde and Fortaleza populations were 0.0195 and 0.0179, respectively, too much inferior to the mean heterozygosity summed to species from the whole world (0.051. The Wright statistical values F IS = 0.5181, F IT = 0.5681 and F ST = 0.1039 and the genetic distance of Nei values showed that the four samples are genetically very similar to each other and that there is homozygote excess in the polymorphic loci.Foram analisadas quatro populações de Neoplecostomus yapo por meio da técnica de eletroforese de aloenzimas em gel de amido de milho. O padrão de bandas obtido foi semelhante ao de N. paranensis, tendo sido detectado um total de 24 loci enzimáticos. Duas populações (ribeirão Atlântico e ribeirão Uraí apresentaram formas monomórficas para todos os 24 loci, enquanto as outras duas (rio Verde e rio Fortaleza apresentaram 8,3% de loci polimórficos. As estimativas de variabilidade genética He para as populações dos rios Verde e Fortaleza foram 0,0195 e 0,0179, respectivamente, muito inferiores à média das espécies de peixes no mundo todo (0,051. Os valores das estatísticas de Wright F IS = 0,5181, F IT = 0,5681 e F ST = 0,1039 e os valores de distância genética de Nei mostram que as quatro populações são geneticamente muito semelhantes entre si e que há excesso de homozigotos nos loci polimórficos.

  14. Phylogeography and RAPD-PCR variation in Hoplias malabaricus (Bloch, 1794 (Pisces, Teleostei in southeastern Brazil

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    Dergam Jorge A.

    2002-01-01

    Full Text Available In the Rio Doce basin of southeastern Brazil, the freshwater fish Hoplias malabaricus (trahira is a widespread predatory characin and one of the few resilient native fishes in a highly impacted lake system. In order to test for genetic differentiation in populations within this basin and for biogeographic relationships among populations of this species in other basins, a study was conducted using RAPD-PCR analysis of Rio Doce samples (N = 63 and phylogeographic analyses with mitochondrial DNA (mtDNA haplotypes, including the Rio Grande and Macacu river basins. In the Rio Doce basin, the patterns of genetic similarity of RAPD-PCR markers (individual fingerprinting and Nei?s genetic distance suggest the existence of two genetically different groups, one composed of the lacustrine populations Carioca and Dom Helvécio, and the other of riverine and the remaining lacustrine populations. The differences in the RAPD-PCR patterns may be explained by the existence of sub-basins within this lacustrine system. A maximum parsimony tree of cytochrome b fragment (383 base pairs supports the view that trahiras of the Rio Doce share a complex biogeographic history with those of neighboring basins. The phylogeographic patterns may be explained by a common history of the watersheds of the Rio Doce, Paraíba do Sul, and Rio Grande basins, corroborating the hypothesis of a Plio-Pleistocene separation of these drainage systems, forming the Mantiqueira "divortium aquarium".

  15. Phylogeography and RAPD-PCR variation in Hoplias malabaricus (Bloch, 1794) (Pisces, Teleostei) in southeastern Brazil

    OpenAIRE

    Dergam Jorge A.; Paiva Samuel R.; Schaeffer Carlos E.; Godinho Alexandre L.; Vieira Fabio

    2002-01-01

    In the Rio Doce basin of southeastern Brazil, the freshwater fish Hoplias malabaricus (trahira) is a widespread predatory characin and one of the few resilient native fishes in a highly impacted lake system. In order to test for genetic differentiation in populations within this basin and for biogeographic relationships among populations of this species in other basins, a study was conducted using RAPD-PCR analysis of Rio Doce samples (N = 63) and phylogeographic analyses with mitochondrial D...

  16. Molecular phylogeny and evolution of Scomber (Teleostei: Scombridae) based on mitochondrial and nuclear DNA sequences

    Institute of Scientific and Technical Information of China (English)

    CHENG Jiao; GAO Tianxiang; MIAO Zhenqing; YANAGIMOTO Takashi

    2011-01-01

    A molecular phylogenetic analysis of the genus Scomber was conducted based on mitochondrial (COI, Cyt b and control region) and nuclear (5S rDNA) DNA sequence data in multigene perspective. A variety of phylogenetic analytic methods were used to clarify the current taxonomic classification and to assess phylogenetic relationships and the evolutionary history of this genus. The present study produced a well-resolved phylogeny that strongly supported the monophyly of Scomber. We confirmed that S. japonicus and S. colias were genetically distinct. Although morphologically and ecologically similar to S. colias, the molecular data showed that S. japonicus has a greater molecular affinity with S. australasicus, which conflicts with the traditional taxonomy. This phyiogenetic pattern was corroborated by the mtDNA data, but incompletely by the nuclear DNA data. Phylogenetic concordance between the mitochondrial and nuclear DNA regions for the basal nodes supports an Atlantic origin for Scomber. The present-day geographic ranges of the species were compared with the resultant molecular phylogeny derived from partition Bayesian analyses of the combined data sets to evaluate possible dispersal routes of the genus. The present-day geographic distribution of Scomber species might be best ascribed to multiple dispersal events. In addition, our results suggest that phylogenies derived from multiple genes and long sequences exhibited improved phylogenetic resolution, from which we conclude that the phylogenetic reconstruction is a reliable representation of the evolutionary history of Scomber.

  17. Biological performance of Asian catfish (Clarias batrachus (Teleostei, Clariidae cultured in recirculating aquaculture system

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    Rahmat Fadhil

    2011-12-01

    Full Text Available The study was conducted to assess the biological performance of Asian catfish in RAS by using4 tanks (3 culture tanks and 1 sedimentation tank measuring 2 m x 1 m x 0.60 m with a volume of 900liters and bio-filter as water purification unit. The numbers of catfish cultured in each tank were as manyas 300 fish i each tank, with a size of 5-8 cm (Tank 1, 8-12 cm (Tank 2 and 12-15 cm (Tank 3,respectively. This study was conducted for 30 days (August-September 2010 by considering the waterquality during experiment, indicates that the RAS are able to provide proper conditions for growth andsurvival of catfish with a survival rate more than 92% on all tank experiments with specific growth ratefrom 0.64 to 0.89% per day and feed conversion rate of about 0.18-0.27. The existence of the impuritiesfrom the fish waste directly influences water quality, but the decline of water quality still at a decent levelfor the culture of catfish. The ANOVA test to the biological performance and water quality showed thatthe difference in the size of fish in each tank has no significant influence between each other.

  18. Molecular Evidence for Multiple Origins of the European Spined Loaches (Teleostei, Cobitidae).

    Science.gov (United States)

    Perdices, Anabel; Bohlen, Joerg; Šlechtová, Vendula; Doadrio, Ignacio

    2016-01-01

    We present a phylogenetic investigation of the Northern Clade, the major monophyletic clade within the freshwater fish family Cobitidae, one of the most prominent families of freshwater fishes found in Asian and European waters. Phylogenetic reconstructions based on the cytochrome b and RAG-1 genes show the genera Microcobitis, Sabanejewia, Koreocobitis and Kichulchoia as monophyletic groups. These reconstructions also show a Cobitis sensu lato and a Misgurnus sensu lato group. The Cobitis sensu lato group includes all species of Cobitis, Iksookimia, Niwaella and Kichulchoia, while the Misgurnus sensu lato group includes Misgurnus, Paramisgurnus and Koreocobitis. Although the monophyly of both the Cobitis sensu lato and Misgurnus sensu lato groups is supported, relationships within the groups are incongruent with current generic definitions. The absence of monophyly of most genera included in the Cobitis sensu lato group (Cobitis, Iksookimia and Niwaella) or their low genetic differentiation (Kichuchoia) supports their consideration as synonyms of Cobitis. Molecular phylogenies indicate that the Asian species of Misgurnus experienced a mitochondrial introgression from a lineage of Cobitis. We also find two nuclear haplotypes in the same Cobitis species from the Adriatic area that, in the absence of morphological differentiation, may indicate molecular introgression. Most lineages within the Northern Clade consist of species found in East Asia. However, some lineages also contain species from Europe and Asia Minor. The phylogenetic relationships presented here are consistent with previous studies suggesting an East Asian origin of the Northern Clade. According to the current distributions and phylogenetic relationships of the Misgurnus sensu lato and Cobitis clade lineages, particularly of M. fossilis and C. melanoleuca, the range expansion of East Asian species into Europe was most likely via Siberia into Northern and Central Europe. Phylogenetic analyses also show that the Cobitis sensu lato group consists of two clear subgroups (I and II), each presenting geographical differences. Subgroup I is distributed exclusively in East Asian drainages with an Eastern European offshoot (C. melanoleuca), whereas Subgroup II includes species widespread throughout Europe (including the Mediterranean), Asia Minor, the Black Sea and the Caucasus, with some lineages related to species restricted to East Asia. PMID:26727121

  19. World-wide species distributions in the family Kyphosidae (Teleostei: Perciformes).

    Science.gov (United States)

    Knudsen, Steen Wilhelm; Clements, Kendall D

    2016-08-01

    Sea chubs of the family Kyphosidae are major consumers of macroalgae on both temperate and tropical reefs, where they can comprise a significant proportion of fish biomass. However, the relationships and taxonomic status of sea chubs (including the junior synonyms Hermosilla, Kyphosus, Neoscorpis and Sectator) worldwide have long been problematical due to perceived lack of character differentiation, complicating ecological assessment. More recently, the situation has been further complicated by publication of conflicting taxonomic treatments. Here, we resolve the relationships, taxonomy and distribution of all known species of sea chubs through a combined analysis of partial fragments from mitochondrial markers (12s, 16s, cytb, tRNA -Pro, -Phe, -Thr and -Val) and three nuclear markers (rag1, rag2, tmo4c4). These new results provide independent evidence for the presence of several junior synonyms among Atlantic and Indo-Pacific taxa, demonstrating that several sea chub species are more widespread than previously thought. In particular, our results can reject the hypothesis of endemic species in the Atlantic Ocean. At a higher taxonomic level, our results shed light on the relationships between Girellidae, Kuhliidae, Kyphosidae, Microcanthidae, Oplegnathidae and Scorpididae, with Scorpididae resolved as the sister group to Kyphosidae. PMID:27143240

  20. 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.

  1. Chromosomal location of retrotransposable REX 1 in the genomes in five Prochilodus (Teleostei: Characiformes.

    Science.gov (United States)

    Voltolin, Tatiana Aparecida; Mendonça, Bruna Bueno; Ferreira, Daniela Cristina; Senhorini, José Augusto; Foresti, Fausto; Porto-Foresti, Fábio

    2013-07-01

    Transposable elements are repetitive DNA sequences comprising a group of segments able to move and carry sequences within the genome. Studies involving comparative genomics have revealed that most vertebrates have different populations of transposable elements with significant differences among species of the same lineage. Few studies have been conducted in fish, the most diverse group of vertebrates, with the objective to locate different types of transposable elements. Therefore, this study proposed to map the retrotransposable element Rex1 applying Fluorescent in situ Hybridization (FISH) in five species of the genus Prochilodus (Prochilodus argenteus, Prochilodus brevis, Prochilodus costatus, Prochilodus lineatus and Prochilodus nigricans). After the application of the Rex1 probe, scattered markings were found throughout the genome of analyzed species, and also the presence of small clusters located in the centromeric and telomeric regions coincident with the heterochromatin distribution pattern. This was the first description of the retrotransposable element Rex1 in Prochilodus genome seeking for a better understanding of the distribution pattern of these retrotransposons in the genome of teleost fish. PMID:24195015

  2. Chromosomal location of retrotransposable REX 1 in the genomes in five Prochilodus (Teleostei

    Science.gov (United States)

    Voltolin, Tatiana Aparecida; Mendonça, Bruna Bueno; Ferreira, Daniela Cristina; Senhorini, José Augusto; Foresti, Fausto; Porto-Foresti, Fábio

    2013-01-01

    Transposable elements are repetitive DNA sequences comprising a group of segments able to move and carry sequences within the genome. Studies involving comparative genomics have revealed that most vertebrates have different populations of transposable elements with significant differences among species of the same lineage. Few studies have been conducted in fish, the most diverse group of vertebrates, with the objective to locate different types of transposable elements. Therefore, this study proposed to map the retrotransposable element Rex1 applying Fluorescent in situ Hybridization (FISH) in five species of the genus Prochilodus (Prochilodus argenteus, Prochilodus brevis, Prochilodus costatus, Prochilodus lineatus and Prochilodus nigricans). After the application of the Rex1 probe, scattered markings were found throughout the genome of analyzed species, and also the presence of small clusters located in the centromeric and telomeric regions coincident with the heterochromatin distribution pattern. This was the first description of the retrotransposable element Rex1 in Prochilodus genome seeking for a better understanding of the distribution pattern of these retrotransposons in the genome of teleost fish. PMID:24195015

  3. Biologie de Prochilodus nigricans (Teleostei : Prochilodontidae) dans le bassin du Mamoré (Amazonie bolivienne)

    OpenAIRE

    Loubens, Gérard; Panfili, Jacques

    1995-01-01

    #Prochilodus nigricans$ is abundant in the whole Amazonian basin. The biology of the population living in the mid-Mamoré river, close to Trinidad (Béni, Bolivia), was studied between 1981 and 1987. We investigated its reproduction, growth, lenght-weight relationship and condition indice, and estimated its abundance. #Prochilodus nigricans$ has a high fecundity and a short reproduction season (January to March). Spawning occurs at the end of the flood on the lagoons banks. Hatching date was fi...

  4. 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.

  5. Chromosomal location of retrotransposable REX 1 in the genomes in five Prochilodus (Teleostei

    OpenAIRE

    Voltolin, Tatiana Aparecida; Mendonça, Bruna Bueno; Ferreira, Daniela Cristina; Senhorini, José Augusto; Foresti, Fausto; Porto-Foresti, Fábio

    2013-01-01

    Transposable elements are repetitive DNA sequences comprising a group of segments able to move and carry sequences within the genome. Studies involving comparative genomics have revealed that most vertebrates have different populations of transposable elements with significant differences among species of the same lineage. Few studies have been conducted in fish, the most diverse group of vertebrates, with the objective to locate different types of transposable elements. Therefore, this study...

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

    OpenAIRE

    Daura Regina Eiras-Stofella; Patricia Charvet-Almeida

    1998-01-01

    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...

  7. The phylogenetic placement of Hollandichthys Eigenmann 1909 (Teleostei: Characidae) and related genera.

    Science.gov (United States)

    Thomaz, Andréa T; Malabarba, Luiz R; Bonatto, Sandro L

    2010-12-01

    The phylogenetic relationships among characids are complex with many genera remaining of uncertain systematic position inside the family. The genus Hollandichthys is one of these problematic genera. It has been considered as incertae sedis inside this family until two recently published phylogenies, one morphological and one molecular, arrived at alternative hypothesizes as to the relationships of Hollandichthys with Pseudochalceus or Rachoviscus, respectively. In this paper, we infer the phylogenetic relations of these taxa based on five genes (three mitochondrial - COI, ND2 and 16S; and two nuclear - Sia and Trop), totaling up to 2719 bp. The 41 analyzed species in the Characidae include four incertae sedis characid taxa once hypothesized as related to Hollandichthys, but never analyzed in a single phylogeny (Rachoviscus, Pseudochalceus, Nematocharax and Hyphessobrycon uruguayensis). Here we propose Rachoviscus as the sister-group of Hollandichthys, grouped in the large clade C previously defined, along with the remaining incertae sedis taxa studied here. In addition, we support the evidence that insemination evolved independently at least three times in the Characidae. PMID:20965264

  8. Revision of Hastatobythites and Saccogaster (Teleostei, Bythitidae) with three new species and a new genus

    DEFF Research Database (Denmark)

    Nielsen, Jørgen; Schwarzhans, Werner; Cohen, Daniel M.

    Material of three similar and probably related genera of the viviparous ophidiiform family, Bythitidae, has been studied. The monotypic Hastatobythites is only known from the original two specimens; re-examination of the paratype and information of the holotype clearly demonstrates the validity of...... the genus. The revision of Saccogaster (Cohen Nielsen 1972) was based on 15 specimens. Since then 29 additional specimens have been collected representing 11 species, three of which are here described: S. brayae, horrida and nikoliviae. Three of the 11 Saccogaster species, S. melanomycter, S. normae...... and S. rhamphidognatha, differ so much from the remaining eight that a new genus, Parasaccogaster, is described. The main diagnostic characters used for the three genera are: A pair of spines on frontal plate behind eyes, spines on snout, length of gill filaments on anterior arch, number and length of...

  9. Two new species of the genus Cobitis linnaeus (Teleostei: Cobitidae) from southern China

    Science.gov (United States)

    Chen, Yongxia; Sui, Xiaoyun; Liang, Na; Chen, Yifeng

    2015-10-01

    Two new species of the genus Cobitis from southern China, C. hereromacula from the Luohe River in Guangdong Province and C. baishagensis from the Nandujiang River in Hainan Province, are described and illustrated here. C. hereromacula can be distinguished from its congeners by possessing the following combination of characteristics: absence of the second and third pigmentary zones of Gambetta; 13-16 oval blotches on the dorsum and 10-13 vertical, elongated triangular blotches below the midlateral line with more than 20 vertical dark brown bars between them; 6-7 narrow rows of dark spots on the caudal fin; a vertical oval spot smaller than the eye diameter on the upper part of the caudal peduncle; pointed mental lobes of the lower lip pointed with a slightly filiform tip; one slender and long needle-shaped lamina circularis at the base of the first branched ray of the male pectoral fins. C. baishagensis can be distinguished from its congeners by the fourth Gambetta zone being covered by 10-12 transverse elongated blotches; 4-5 narrow rows of dark spots on the caudal fin; a vertical blotch smaller than the eye diameter on the upper part of the caudal peduncle; males with a slender and long needle-shaped lamina circularis at the second branched pectoral fin ray in males; large scales with a slightly large focal zone; undeveloped mental lobes with a lower lip that does not end posteriorly in a filiform tip.

  10. A new Eocene catostomid (Teleostei: Cypriniformes) from northeastern China and early divergence of Catostomidae

    Institute of Scientific and Technical Information of China (English)

    CHANG; Mee-mann

    2009-01-01

    A new Eocene catostomid genus and species,Plesiomyxocyprinus arratiae, is described from Huadian, Jilin Province, northeastern China. The materials include a nearly complete skeleton, dozens of pharyngeal bones with teeth, and a number of disarticulated bones. The new articulated specimen is large-sized and deep-bodied, with an estimated standard length of ca. 300 mm and body depth of 156 mm or about half of its standard length. The assignment of the fish to the Catostomidae is based on its falciform pharyngeal bone with one row of numerous (more than 50) compressed teeth, and the bone is much smaller than in cyprinids, especially given the size of the fish. The new fish distinguishes itself from all known catostomids (both extinct and extant) in its long anal fin with four unbranched and 17-18 branched rays, and its extremely short caudal peduncle that is only about one fourth of its depth. Plesiomyxocyprinus arratiae resembles the Eocene-Oligocene transpacific-distributed Amyzon in many general skeletal characters. However, it shows a few characters uniquely shared with the Recent catostomid Myxocyprinus asiaticus. Those include a very long dorsal fin with about 50 branched fin rays, the end of dorsal fin rays being close to the caudal fin base, and anal rays stretching posteriorly beyond the base of caudal fin. It is the first fossil catostomid that shows a close relationship to the endemic Myxocyprinus now living in the Yangtze River and Minjiang River, China. The discovery of Plesiomyxocyprinus arratiae, along with two previously described possible catostomid genera Jianghanichthys and Vasnetzovia, may indicate that the divergence of the Catostomidae started much earlier, in the middle Eocene or earlier, on the western side of the Pacific than on its eastern side.

  11. A new Eocene catostomid (Teleostei: Cypriniformes) from northeastern China and early divergence of Catostomidae

    Institute of Scientific and Technical Information of China (English)

    LIU Juan; CHANG Meemann

    2009-01-01

    A new Eocene catostomid genus and species, Plesiomyxocyprinus arratiae, is described from Huadian, Jilin Province, northeastern China. The materials include a nearly complete skeleton, dozens of pharyngeal bones with teeth, and a number of disarticulated bones. The new articulated specimen is large-sized and deep-bodied, with an estimated standard length of ca. 300 mm and body depth of 156 mm or about half of its standard length. The assignment of the fish to the Catostomidae is based on its falciform pharyngeal bone with one row of numerous (more than 50) compressed teeth, and the bone is much smaller than in cyprinids, especially given the size of the fish. The new fish distinguishes itself from all known catostomids (both extinct and extant) in its long anal fin with four unbranched and 17-18 branched rays, and its extremely short caudal peduncle that is only about one fourth of its depth. Plesiomyxocyprinus arratiae resembles the Eocene-Oligocene transpacific-distributed Amyzon in many general skeletal characters. However, it shows a few characters uniquely shared with the Recent catostomid Myxocyprinus asiaticus. Those include a very long dorsal fin with about 50 branched fin rays, the end of dorsal fin rays being close to the caudal fin base, and anal rays stretching posteriorly beyond the base of caudal fin. It is the first fossil catostomid that shows a close relationship to the endemic Myxocyprinus now living in the Yangtze River and Minjiang River, China. The discovery of Plesiomyxocyprinus arratiae, along with two previously described possible catostomid genera Jianghanichthys and Vasnetzovia, may indicate that the divergence of the Catostomidae started much earlier, in the middle Eocene or earlier, on the western side of the Pacific than on its eastern side.

  12. New and previously described species of Dactylogyridae (Monogenoidea) from the gills of Panamanian freshwater fishes (Teleostei).

    Science.gov (United States)

    Mendoza-Franco, Edgar F; Aguirre-Macedo, M Leopoldina; Vidal-Martínez, Victor M

    2007-08-01

    During an investigation of the diversity of metazoan parasites of 7 freshwater fish species from 3 localities in central Panama, the following gill dactylogyrid (Monogenoidea) species were found: Aphanoblastella chagresii n. sp. from Pimelodella chagresi (Heptapteridae); Aphanoblastella travassosi (Price, 1938) Kritsky, Mendoza-Franco, and Scholz, 2000 from Rhamdia quelen (Heptapteridae); Diaphorocleidus petrosusi n. sp. from Brycon petrosus (Characidae); Gussevia asota Kritsky, Thatcher, and Boeger, 1989, from Astronotus ocellatus (Cichlidae); Sciadicleithrum panamensis n. sp. from Aequidens coeruleopunctatus (Cichlidae); Urocleidoides flegomai n. sp. from Piabucina panamensis (Lebiasinidae); and Urocleidoides similuncus n. sp. from Poecilia gillii (Poeciliidae). Consideration of the comparative morphology and distribution of these parasites along with the evolutionary history of the host fishes suggests that diversification may be associated with geotectonic events that provided isolation of the Central American fauna with the uplift of the Panamanian Isthmus during early Pliocene (3 mya). PMID:17918354

  13. Reproductive biology of weakly electric fish Eigenmannia trilineata López and Castello, 1966 (Teleostei, Sternopygidae)

    OpenAIRE

    Júlia Giora; Clarice Bernhardt Fialho

    2009-01-01

    This study described the reproductive biology of a population of the weakly electric fish Eigenmannia trilineata from southern Brazil, providing the information on the estimation of reproductive period, fecundity, spawning type, first maturation size, and analysis of gonadal morphology and histology of the species, relating these data to alimentary and abiotic characters. The species showed a relatively long reproductive period, a relative fecundity of 0.27 oocytes per mg of total weight and ...

  14. Reproductive characteristics of characid fish species (Teleostei, Characiformes) and their relationship with body size and phylogeny

    OpenAIRE

    Marco A. Azevedo

    2010-01-01

    In this study, I investigated the reproductive biology of fish species from the family Characidae of the order Characiformes. I also investigated the relationship between reproductive biology and body weight and interpreted this relationship in a phylogenetic context. The results of the present study contribute to the understanding of the evolution of the reproductive strategies present in the species of this family. Most larger characid species and other characiforms exhibit a reproductive p...

  15. Reproductive biology of weakly electric fish Eigenmannia trilineata López and Castello, 1966 (Teleostei, Sternopygidae

    Directory of Open Access Journals (Sweden)

    Júlia Giora

    2009-06-01

    Full Text Available This study described the reproductive biology of a population of the weakly electric fish Eigenmannia trilineata from southern Brazil, providing the information on the estimation of reproductive period, fecundity, spawning type, first maturation size, and analysis of gonadal morphology and histology of the species, relating these data to alimentary and abiotic characters. The species showed a relatively long reproductive period, a relative fecundity of 0.27 oocytes per mg of total weight and a parcelled spawning type. First maturation size estimated for the females was 80.5 mm and for the males 63.5 mm of total length. Sex ratio did not differ from 1:1 under a X²test (α= 0.01 during all the sampled months. Sexual dimorphism was related to total length, and males had larger total length than females. The abiotic factors photoperiod and water conductivity presented significant correlations with female GSI, while male GSI presented a significant correlation only with photoperiod.Este trabalho descreve a biologia reprodutiva de uma população do peixe elétrico Eigenmannia trilineata do Sul do Brasil. São apresentadas informações a respeito do período reprodutivo, fecundidade, tipo de desova, tamanho de primeira maturação, morfologia e histologia das gônadas da espécie, relacionando estes dados a caracteres alimentares e abióticos. A espécie apresentou período reprodutivo relativamente longo, com fecundidade relativa de 0,27 ovócito por miligrama do peso da fêmea e desova do tipo parcelada. O tamanho de primeira maturação gonadal estimado para fêmeas foi 80,5 mm e para machos, 63,5 mm de comprimento total. A proporção sexual, testada pelo teste X² (Α= 0.01, foi de 1:1 durante todos os meses amostrados; dimorfismo sexual relacionado ao comprimento total foi detectado, possuindo os machos um maior comprimento total. Dos fatores abióticos testados, fotoperíodo e condutividade da água mostraram correlação significativa com o IGS das fêmeas, enquanto somente fotoperíodo apresentou-se relacionado ao IGS dos machos.

  16. The complete mitogenome of Japanese swallow angelfish (Genicanthus semifasciatus) and Ornate angelfish (Genicanthus bellus) (Teleostei: Pomacanthidae).

    Science.gov (United States)

    Hsiao, Chung-Der; Shen, Kang-Ning; Tsai, Shiou-Yi; Wu, Shan-Chun; Chen, Ching-Hung; Chang, Chih-Wei

    2016-07-01

    In this study, we used the next-generation sequencing method to determine the complete mitogenome of Japanese swallow angelfish (Genicanthus semifasciatus) and Ornate angelfish (Genicanthus bellus) for the first time. The assembled mitogenome, 16,722 bp and 16,734 bp in length, shows 95% identity to each other. Both mitogenomes follow the typical vertebrate arrangement, including 13 protein-coding genes, 22 transfer RNAs, 2 ribosomal RNAs genes and a non-coding control region of D-loop. D-loop contains length of 1013 bp in G. semifasciatus and 1030 bp in G. bellus, and is located between tRNA-Pro and tRNA-Phe. The overall GC content is 46.4% for G. semifasciatus and 46.6% for G. bellus. The complete mitogenome of Japanese swallow angelfish and Ornate angelfish determined in this study provides essential and important DNA molecular data for further phylogenetic and evolutionary analyses for marine angelfish. PMID:26024128

  17. Molecular Phylogeny and Biogeography of the Amphidromous Fish Genus Dormitator Gill 1861 (Teleostei: Eleotridae)

    Science.gov (United States)

    Galván-Quesada, Sesángari; Doadrio, Ignacio; Alda, Fernando; Perdices, Anabel; Reina, Ruth Gisela; García Varela, Martín; Hernández, Natividad; Campos Mendoza, Antonio; Bermingham, Eldredge; Domínguez-Domínguez, Omar

    2016-01-01

    Species of the genus Dormitator, also known as sleepers, are representatives of the amphidromous freshwater fish fauna that inhabit the tropical and subtropical coastal environments of the Americas and Western Africa. Because of the distribution of this genus, it could be hypothesized that the evolutionary patterns in this genus, including a pair of geminate species across the Central American Isthmus, could be explained by vicariance following the break-up of Gondwana. However, the evolutionary history of this group has not been evaluated. We constructed a time-scaled molecular phylogeny of Dormitator using mitochondrial (Cytochrome b) and nuclear (Rhodopsin and β-actin) DNA sequence data to infer and date the cladogenetic events that drove the diversification of the genus and to relate them to the biogeographical history of Central America. Two divergent lineages of Dormitator were recovered: one that included all of the Pacific samples and another that included all of the eastern and western Atlantic samples. In contrast to the Pacific lineage, which showed no phylogeographic structure, the Atlantic lineage was geographically structured into four clades: Cameroon, Gulf of Mexico, West Cuba and Caribbean, showing evidence of potential cryptic species. The separation of the Pacific and Atlantic lineages was estimated to have occurred ~1 million years ago (Mya), whereas the four Atlantic clades showed mean times of divergence between 0.2 and 0.4 Mya. The splitting times of Dormitator between ocean basins are similar to those estimated for other geminate species pairs with shoreline estuarine preferences, which may indicate that the common evolutionary histories of the different clades are the result of isolation events associated with the closure of the Central American Isthmus and the subsequent climatic and oceanographic changes. PMID:27074006

  18. Reproductive biology of Steindachnerina insculpta (Fernandez-Yépez (Teleostei, Curimatidae in Furnas reservoir, Minas Gerais, Brazil Biologia reprodutiva de Steindachnerina insculpta (Fernandez-Yépez (Teleostei, Curimatidae no reservatório de Furnas, Minas Gerais, Brasil

    Directory of Open Access Journals (Sweden)

    Vinicius M. A. Ribeiro

    2007-03-01

    Full Text Available The 'saguiru' Steindachnerina insculpta, a small teleost detritivorous fish species in Furnas reservoir, upper rio Paraná basin, Minas Gerais, Brazil, has a prolonged period of reproductive activity that extends from September to March, with fractionated spawning. During gonadal maturation, the females showed a low hepatosomatic index, suggesting that hepatic substances are possibly transferred from liver to ovaries. During the reproductive period, this fish had lower stomach repletion and coelomic fat indexes, indicating that the species eat less and consume more fat reserves. The weight of the ovaries influenced positively the condition factor (K1, since the lowest K2 values (without the gonads weight, were obtained during maturation, confirming the influence of the weight of the ovaries upon the physiological condition of the females.O 'saguiru' Steindachnerina insculpta, peixe teleósteo detritívoro que ocorre no reservatório de Furnas, bacia do alto Paraná, Minas Gerais, apresenta período reprodutivo prolongado que se estende de setembro a março, com desova parcelada. Durante a maturação gonadal, fêmeas apresentaram baixos valores do índice hepatossomático, sugerindo que possivelmente, substâncias hepáticas são transferidas do fígado para os ovários. Durante o período reprodutivo, os peixes desta espécie apresentam índices de repleção estomacal e de gordura celômica baixos, indicando diminuição da atividade alimentar e consumo de reservas. O peso dos ovários influencia positivamente o fator de condição (K1, uma vez que os mais baixos valores de K2 (sem o peso das gônadas foram obtidos durante a maturação, confirmando a influência do peso dos ovários na condição fisiológica das fêmeas.

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

    Directory of Open Access Journals (Sweden)

    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.

  20. Tolerância de juvenis do pampo Trachinotus marginatus (Teleostei, Carangidae ao choque agudo de salinidade em laboratório Acute salinity tolerance of juvenile pompano Trachinotus marginatus (Teleostei, Carangidae under laboratory conditions

    Directory of Open Access Journals (Sweden)

    Luís André Sampaio

    2003-08-01

    Full Text Available O pampo Trachinotus marginatus é uma espécie com potencial para piscicultura, mas a sua utilização pode ser limitada pelas variações de salinidade comuns em estuários ou em ambientes super-salinos. Este trabalho foi realizado com o objetivo de determinar a tolerância à salinidade de juvenis de T. marginatus em laboratório. Foram testadas 12 salinidades em duplicata (0, 6, 8, 10, 15, 25, 45, 55, 58, 61, 65 e 75‰ e um tratamento controle (35‰. Dez peixes (comprimento total: 20,7±2,3mm e peso úmido: 427±113mg foram colocados em tanques plásticos de 3L. A temperatura da água foi mantida em 24ºC com um banho termostatisado, aeração constante e, a cada 24 horas, os meios experimentais foram completamente renovados. Após 96 horas de exposição, as salinidades letais médias inferior e superior, com os respectivos intervalos de confiança (IC 95%, foram estimadas em 6,99‰ (IC 95% = 6,86-7,13‰ e 58,50‰ (IC 95% = 56,81-60,24‰, respectivamente. Estes resultados permitem caracterizar esta espécie como eurialina. O estudo da influência da salinidade sobre T. marginatus deve ser aprofundado, buscando avaliar principalmente os efeitos sobre o crescimento, de modo que seja possível determinar o potencial do seu cultivo em ambientes com diferentes salinidades.The pompano Trachinotus marginatus shows good potential for aquaculture, but the success of its culture might be limited by the salinity fluctuations common in estuaries or in hyper-saline environments. The objective of this work was to establish the salinity tolerance of juvenile T. marginatus under laboratory conditions. Twelve salinities (0, 6, 8, 10, 15, 25, 45, 55, 58, 61, 65, and 75‰ plus a control (35‰ were tested in duplicate. Groups of ten fish (total length: 20.7±2,3mm and wet weight: 427±113mg were placed in plastic tanks with 3L of water. A water bath was set to control the temperature at 24ºC, water was continuously aerated, and completely exchanged every 24h. After 96 hours, lower and upper medium lethal salinities and their respective confidence intervals (CI 95% were estimated as 6.99‰ (CI 95% = 6.86-7.13‰, and 58.50‰ (CI 95% = 56.81-60.24‰, respectively. These results allow the characterization of this species as euryhaline. The influence of salinity on T. marginatus should be studied with more detail, with special attention to its effects on growth, in order to determine the potential for T. marginatus culture in different salinities.

  1. 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

    Directory of Open Access Journals (Sweden)

    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 ovaries presented similar morphology to other Siluriformes species. Gonads were classified in four development phases of the ovarian follicle, according to histology: immature, initial maturation, final maturation and mature. The gonadosomatic index varied from 0.29 to 9.16 for males and from 0.11 to 13.03 for females. Mature individuals were observed during summer (December/2001 and January/2002, fall (April and May/2002 and spring (September and October/2002, following the increase in water temperature.

  2. Capacidades de modulación y plasticidad funcional de los mecanismos de captura de alimento en Atherinopsinae sudamericanos (Teleostei, Atherinidae The capacities of modulation and functional plasticity of the prey capture mechanisms in South-American Atherinopsinae (Teleostei, Atherinidae

    Directory of Open Access Journals (Sweden)

    EDUARDO DE LA HOZ U

    1994-01-01

    Full Text Available Se describe y compara los diseños estructurales bucales en diferentes especies pertenecientes a dos grupos de géneros de Atherinopsinae, en relación a las características y potencialidades de variabilidad de sus mecanismos de protrusión premaxilar y mordida premaxilar. El grupo de especies de los géneros Cauque y Austromenidia posee un esquema estructural de huesos, músculos y ligamentos, que determina una gran magnitud de protrusión y una gran capacidad de mordida, en diferentes posiciones de mandíbula y grados de protrusión. Análisis electromiográficos de la actividad de los fascículos Al y A3 del músculo aductor mandibular y filmaciones durante distintos eventos de captura de presas, demuestran la existencia de gran plasticidad funcional del mecanismo de mordida, capacidad manifestada por diversos grados de sincronización y duración de la actividad entre ambos músculos. El esquema estructural de Basilichthys, en cambio, determina que estos mecanismos se presenten mucho más restringidos y con un patrón neuromuscular bastante estereotipado, con sólo una pequeña capacidad de variación en la duración de la actividad muscularThe design of the buccal structures of species belonging to two genus-groups of Atherinopsinae are described and compared, related to the characteristics and variation potentiality of their mechanisms of premaxillary protrusion and bite. The species of the Cauque-Austromenidia group have a structural pattern of bones, muscles and ligaments, that determine a large amount of protrusion, and a great capacity of biting. Their premaxillary bite is realized at different jaw positions, as well as degrees of protrusion. Electromyographic analyses of the fascicles Al y A3 of the muscle adductor mandibulae, and film recording during different prey-capture events, show a great plasticity in the biting mechanism. This plasticity is revealed by the di verse degrees of activity syncronism and tirning between muscles. The structural design of Basilichthys species, determine limited mechanisms with a stereotyped neuromuscular attern, which presents only a small variation capacity in the activity timing, if compared to the Cauque-Austromenidia group

  3. Avaliação da mutagênese e genotoxicidade em Eigenmannia virescens (Teleostei: Gymnotiformes) expostos ao benzeno Avaliation of mutagenicity and gentotoxicity in Eigenmannia virescens (Teleostei: Gymnotiformes) exposed to benzene

    OpenAIRE

    Augusto Bücker; Wanderson Carvalho; José Antonio Alves-Gomes

    2006-01-01

    Os efeitos de substâncias genotóxicas sobre o genoma de peixes tem sido objeto de muitos estudos, sobretudo daqueles que buscam estabelecer a resposta dos genes aos estímulos ambientais. O presente trabalho teve como objetivo realizar um estudo sobre mutagenicidade e genotoxicidade em peixes elétricos da espécie Eingenmannia virescens, pela exposição ao benzeno (50ppm), utilizando as técnicas da Freqüência de Micronúcleos (MNs) e o Ensaio do Cometa. Foram coletadas amostras do sangue de dez p...

  4. Reproductive aspects of the gulf pipefish, Syngnathus scovelli (Teleostei: Syngnathidae, from Southeastern Brazil Aspectos reprodutivos do peixe cachimbo Syngnathus scovelli (Teleostei: Syngnathidae, de uma praia arenosa de Vitória, ES

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    J. L. GASPARINI

    1999-02-01

    Full Text Available This study attempts to assess the relationship between fecundity and fertility of males and females of the gulf pipefish, Syngnathus scovelli. Specimens of this pipefish were collected in detached algae in the inner surf-zone of a dissipative sandy beach in southeastern Brazil. 97 specimens were collected, and they were associates to detached algae. From these, 14 were males, 36 females and 47 immature. Male-female sex ratio was 0.4:1, which was significantly different from the expected 1:1 ratio. Fish ranged from 43 to 98 mm TL (Fig. 1, and males and females showed similar size. Only 7 males were pregnants, while 9 females had hydrated oocytes. Minimum number of eggs/embryos in the pouch was 30 and the maximum 92. Minimum number of hydrated oocytes was 36, and the maximum was 165. The number of egg/embryos, and hydrated oocytes were weakly related to total length. It seems that the gulf pipefish occupy the inner surf-zone of the Praia do Iate are brought to the shallows accidentally when the specimens were inhabiting drifting vegetation.Este estudo avalia a relação entre fecundidade e fertilidade de machos e fêmeas do peixe-cachimbo, Syngnathus scovelli, o qual ocorre em algas destacadas na zona de arrebentação de uma praia arenosa com ondas do tipo dissipativa em Vitória, ES. Foram coletados 97 exemplares, sendo todos associados com algas destacadas. Destes, 14 eram machos, 36 fêmeas e 47 imaturos. A razão sexual macho/fêmea foi de 0,4:1, a qual foi significativamente diferente da esperada razão sexual de 1:1. O peixe-cachimbo variou de 43 a 98 mm de comprimento total, e machos e fêmeas tiveram tamanhos similares. Somente 7 machos tinham ovos na bolsa incubadora, enquanto 9 fêmeas apresentaram ovócitos hidratados. O número mínimo de ovos/embriões na bolsa incubadora foi 30 e o máximo 92. O número mínimo de ovócitos hidratados foi 36 e o máximo 165. O número de ovos/embriões e ovócitos hidratados foram fracamente relacionados ao comprimento total. Parece que os exemplares de S. scovelli que habitam a parte interna da zona de arrebentação da Praia do Iate são trazidos para as partes rasas involuntariamente quando os espécimens estão ocupando algas destacadas.

  5. Relação peso-comprimento de Orthopristis ruber (Cuvier (Teleostei, Haemulidae na Baia de Sepetiba, Rio de Janeiro, Brasil Length-weight relationship of Orthopristis ruber (Cuvier (Teleostei, Haemulidae in the Sepetiba Bay, Rio de Janeiro, Brazil

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    André L. B. dos Santos

    2004-06-01

    Full Text Available A relação peso-comprimento de Orthopristis ruber (Cuvier, 1830 na Baia de Sepetiba (22º54'-23º04'S; 43º34'-44º10'W, Rio de Janeiro foi determinada. Este trabalho objetiva contribuir com o conhecimento sobre a morfometria desta espécie na baía e fornecer bases para comparações com outros ambientes. Os peixes foram coletados em programas de amostragens de arrasto de praia (juvenis e arrasto de fundo (adultos entre outubro de 1998 e setembro de 1999. A equação encontrada foi W = 0,000006 L3,1368 para machos e W = 0,000006 L3,14º3 para fêmeas. Alometria positiva foi encontrada para machos e fêmeas e a proporção sexual foi de 1:1. Os altos valores para o coeficiente alométrico indicam alto investimento no crescimento, que pode ser devido ao pequeno tamanho relativo dos espécimes da população analisada, ou ser um mecanismo para suportar as condições de estresse nesta área.The lenght-weight relationship of Orthopristis rubber (Cuvier, 1830 in the Sepetiba Bay (22º54'-23º04'S; 43º34'-44º10'W, Rio de Janeiro was determined. It aims to contribute to morphometrics knowledge of this species in a semi-closed coastal area and to supply basis for comparisons with others environment. Fishes were collected by beach seine (juveniles and otter trawl (adults from October 1998 to September 1999. The equation found was W = 0,000006 L3,1368 for males and W = 0,000006 L3,14º3 for females. Positive allometry was found for both sexes and sex rate was 1:1. The comparatively high values for allometric coefficient indicate high investment in growth, which can be due to relatively small size of the examined fish populations, or a mechanism to overcome stress conditions in the area.

  6. Toxicidade aguda do nitrito em larvas do peixe-rei marinho Odontesthes argentinensis (Teleostei, Atherinopsidae Acute toxicity of nitrite on larvae of the marine pejerrey Odontesthes argentinensis (Teleostei, Atherinopsidae

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    Luís André Sampaio

    2006-06-01

    Full Text Available Este trabalho visou a determinar o efeito tóxico do nitrito sobre larvas do peixe-rei marinho Odontesthes argentinensis através de testes agudos com 96h de duração. As larvas utilizadas neste experimento foram cultivadas no Laboratório de Maricultura da FURG (Rio Grande - RS. Foi utilizada água do mar filtrada na salinidade 35‰, na temperatura de 23°C, com fotoperíodo de 14 horas de luz e aeração constante. Diariamente, as larvas mortas foram retiradas e, em seguida, 100% do meio experimental foi renovado. Não foi fornecido alimento durante a exposição ao nitrito. As larvas foram expostas a cinco concentrações de nitrito: 50, 150, 250, 350 e 450mg L-1 N-NO2-, mais um controle onde o nitrito não foi adicionado. A CL50-96h (concentração letal para 50% dos organismos após 96 horas e seu intervalo de confiança (95% foram de 199,3 (142,0-279,6mg L-1 N-NO2-. Os resultados deste trabalho sugerem que, assim como outras espécies de peixes marinhos, o O. argentinensis é uma espécie tolerante a altas concentrações de nitrito e é pouco provável que este último seja um problema para o cultivo intensivo desta espécie.This work evaluated the toxicity of nitrite on larvae of the marine pejerrey Odontesthes argentinensis through acute exposure during 96h. Larvae used in this experiment were cultivated in the Laboratory of Mariculture of the University of Rio Grande. During the tests temperature was 23°C, salinity 35‰, and 14 hours of light were provided. Every day dead larvae were removed and the experimental media were completely renewed. Larvae were deprived of food during the test. Concentrations for the acute tests were 50, 150, 250, 350 and 450mg L-1 N-NO2-, plus a control with no nitrite added. Lethal concentration for 50% of the organisms (LC50-96h, and its confidence interval, was 199.3 (142.0-279.6mg L-1 N-NO2-. The results of the acute tests suggest that, as other species of marine fish larvae, O. argentinensis is tolerant to high concentrations of nitrite, and it is unlikely that it would be a problem for the intensive culture of this species.

  7. Ecomorphology and food habits of teleost fishes Trachinotus carolinus (Teleostei: Carangidae) and Menticirrhus littoralis (Teleostei: Sciaenidae), inhabiting the surf zone off Niterói, Rio de Janeiro, Brazil

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    Luana Prestrelo Palmeira; Cassiano Monteiro-Neto

    2010-01-01

    The ecomorphology and food habits of juvenile Trachinotus carolinus and Menticirrhus littoralis caught in the surf zone of sandy beaches in Niterói, RJ, were investigated between July 2006 and May 2007. These fish species differ morphologically, but present similarities in their diet composition suggest some slight overlapping in their diet. The importance of food items was assessed using Kawakami and Vazzoler's feeding index. Morphometric variables were recorded to correlate with the diet co...

  8. Ecomorphology and food habits of teleost fishes Trachinotus carolinus (Teleostei: Carangidae and Menticirrhus littoralis (Teleostei: Sciaenidae, inhabiting the surf zone off Niterói, Rio de Janeiro, Brazil

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    Luana Prestrelo Palmeira

    2010-01-01

    Full Text Available The ecomorphology and food habits of juvenile Trachinotus carolinus and Menticirrhus littoralis caught in the surf zone of sandy beaches in Niterói, RJ, were investigated between July 2006 and May 2007. These fish species differ morphologically, but present similarities in their diet composition suggest some slight overlapping in their diet. The importance of food items was assessed using Kawakami and Vazzoler's feeding index. Morphometric variables were recorded to correlate with the diet composition of the different size classes for each species. A total of 210 fishes (Trachinotus carolinus - 122, Menticirrhus littoralis - 88, ranging between 24.2 mm and 112 mm total length, were analyzed, but the stomachs of only 84.8% of them contained food. Trachinotus carolinus presented mysids, Polychaetes and Emerita spp. as the predominant items in their diet. Formicidae and Isopoda were the most important items for class I individuals, whereas mysids and Emerita spp. were important for classes II and III. Class I individuals also showed smaller sized prey (amphipods and isopods and clupeid fish larvae in their diet. Emerita spp. dominated the food items of Menticirrhus littoralis regardless of the size class. Polychaetes, the second most important item was better represented in class sizes II and III. The main morphometric variable correlated with such differences included mouth position and diameter of the eye.A ecomorfologia e os hábitos alimentares de juvenis de Trachinotus carolinus e Menticirrhus littoralis capturados na zona de arrebentação de praias arenosas em Niterói, RJ, foram investigados entre julho de 2006 e Maio de 2007. Ambas as espécies diferem morfologicamente, mas apresentam semelhanças em sua dieta, sugerindo uma possível sobreposição alimentar. A importância dos itens alimentares foi avaliada utilizando o índice alimentar de Kawakami e Vazzoler. Variáveis morfométricas foram correlacionadas à dieta observada para diferentes classes de tamanho, para cada espécie. Um total de 210 peixes (Trachinotus carolinus - 122, Menticirrhus littoralis - 88, variando entre 24.2 mm e 112 mm de comprimento total, foram analisados, mas apenas 84.8% continham alimento. Trachinotus carolinus apresentou mysidáceos, poliquetas e Emerita spp. como os itens predominantes na dieta. Formicidae e Isopoda foram os itens mais importantes para a classe I de tamanho dos indivíduos, enquanto que mysidáceos e Emerita spp. foram importantes para as classes II e III. Indivíduos da classe I também apresentaram itens de menor tamanho (anfípodos e isópodos bem como larvas de peixes clupeídeos na dieta. Emerita spp. dominou a alimentação de Menticirrhus littoralis, independentemente da classe de tamanho. Poliquetas, o segundo item mais importante, foi mais bem representado na classe II e III de tamanho dos indivíduos. As principais variáveis morfométricas correlacionadas com essas diferenças incluíram a posição da boca e o diâmetro do olho.

  9. Especie nueva del género Bryconamericus (Teleostei: Characidae del río Fonce, sistema río Magdalena, Colombia A new fish species of the genus Bryconamericus (Teleostei: Characidae from the Fonce river, Magdalena Basin, Colombia

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    César Román-Valencia

    2009-08-01

    Full Text Available Se describe una especie nueva del género Bryconamericus Eigenmann, 1907 de la cuenca río Fonce, sistema río Magdalena, Colombia. La especie se distingue de sus congéneres por el número de radios anteriores de la aleta anal cubiertos por una hilera de escamas (4-11 vs. 11-26, excepto de B. orinocoense Román-Valencia 2003, de la cual se distingue por el mayor número de radios ramificados en la aleta anal 19-26 vs. 16-17 y de escamas en la línea lateral (39-45 vs. 31-32; en machos, por un número reducido de espinas sobre los radios en las aletas (anal 2-10 vs. 9-23, pélvicas 2-9 vs. 8-20, pectorales 2-6 vs. 9-28 y dorsal 3-6 vs. 6-18. Se suministran datos ecológicos del hábitat del nuevo taxon y una clave taxonómica para las especies de la cuenca de los ríos Cauca-Magdalena, Sinú y Ranchería.A new fish species of Bryconamericus Eigenmann 1907 is described from the Fonce river, Magdalena Basin of Colombia. The species can be distinguished from all congeners by the number of anterior anal fin rays covered by a scales row (4-11 vs.11-26, except B. orinocoense Román-Valencia 2003 with 1-6, from which is distinguished by the higher number of branched anal fin rays 19 -26 vs. 16-17 and lateral line scales (39-45 vs.31-32; in males, by the spines number on each fins rays (anal 2-10 vs. 9-23, pelvic 2-9 vs. 8-20, pectorals 2-6 vs.9-28 and dorsal 3-6 vs. 6-18. Ecological data of the aquatic habitat of the new taxon are presented and a key to species of Bryconamericus from Cauca-Magdalena, Sinú and Ranchería rivers in Colombia is provided.

  10. Avaliação da mutagênese e genotoxicidade em Eigenmannia virescens (Teleostei: Gymnotiformes expostos ao benzeno Avaliation of mutagenicity and gentotoxicity in Eigenmannia virescens (Teleostei: Gymnotiformes exposed to benzene

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    Augusto Bücker

    2006-01-01

    Full Text Available Os efeitos de substâncias genotóxicas sobre o genoma de peixes tem sido objeto de muitos estudos, sobretudo daqueles que buscam estabelecer a resposta dos genes aos estímulos ambientais. O presente trabalho teve como objetivo realizar um estudo sobre mutagenicidade e genotoxicidade em peixes elétricos da espécie Eingenmannia virescens, pela exposição ao benzeno (50ppm, utilizando as técnicas da Freqüência de Micronúcleos (MNs e o Ensaio do Cometa. Foram coletadas amostras do sangue de dez peixes em diferentes tempos de exposição: T0, 24h, 48h, 72h, 96h e 360h (15 dias. Para a análise das lâminas no Teste do MN, foram contadas 1.000 células e estipulada a freqüência de ocorrência de MNs. Para análise do Ensaio do Cometa a contagem foi feita estipulando quatro classes de danos: I - II - III - IV, e para a análise estatística foram atribuídos valores numéricos (ranques de 0 a 3, respectivamente, verificando diferenças significativas para a soma dos ranques em todos os tempos de exposição em relação ao T0. No Teste do Micronúcleo não foi possível detectar efeitos mutagênicos significativos nos eritrócitos analisados. No entanto, para o Ensaio do Cometa os resultados sugerem ação genotóxica do benzeno, devido a um aumento gradual no número de células com maiores classes de danos de acordo com maior tempo de exposição, indicando um efeito tempo-dependente. Estes resultados sugerem maior sensibilidade do Ensaio do Cometa que o Teste do MN.The effects of genotoxic substances on fishes genome have been object of many studies, especially those which attempt to establish the responses of genes to environmental stimulus. The objective of this study was to evaluate the mutagenicity and genotoxicity in electric fishes of species Eingenmannia virescens, under to benzene exposure (50ppm, utilizing Micronuclei Test (MNs and Comet Assay techniques. Ten fish blood samples were collected in different times of exposure: T0, 24h, 48h, 72h, 96h and 360h (15 days. To determine the frequency of MNs, 1.000 cells per microscopical slides were counted. For the Comet Assay analysis, four damage classes were defined: I - II - III - IV, and for the statistic analysis number values (ranks from 0 to 3 were assigned for each class. The sum of ranks (values for all times of exposure was compared to T0 and these differences were statistically analyzed. On Micronuclei Test demonstrated do not possible detect significant mutagenic effects in the erythrocytes analyzed. On the other hand, for the Comet Assay, the results suggested genotoxic action of benzene, proper the gradual increase of number of cells with greatest damage class with the greatest of exposure time, indicating an effect time-dependent. These results suggested the most sensibility for the Comet Assay like Micronuclei Test.

  11. Inoculação de suspensão bacteriana de Plesiomonas shigelloides em Jundiá, Rhamdia quelen (Teleostei: Pimelodidae Inoculation of bacterial suspension of Plesiomonas shigelloides in jundiá, Rhamdia quelen (Teleostei: Pimelodidae

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    Cheila de Lima Boijink

    2001-06-01

    Full Text Available Com o crescimento da aqüicultura mundial e intensificação da criação de peixes, os animais ficam sujeitos às enfermidades bacterianas e outras. Com o objetivo de avaliar a patogenicidade da Plesiomonas shigelloides para jundiás (Rhamdia quelen, diferentes concentrações bacterianas (3 x 10(8 e 9 x 10(8 UFC - Unidade Formadora de Colônia/ml foram inoculadas por via intraperitoneal. Foram utilizados 84 jundiás juvenis com peso e comprimento médios de 24,37 ± 4,28g e 14,42 ± 1,62cm, respectivamente. Os animais inoculados foram mantidos durante 21 dias, em caixas d'agua de amianto, em condições semelhantes de temperatura, pH, alcalinidade e dureza. Os jundiás foram sacrificados a cada dois dias para contagem de UFC/ml de tecido renal. Por observações diárias, constatou-se que a inoculação intraperitoneal de Plesiomonas shigelloides não ocasionou nenhuma alteração nos jundiás, independente da concentração inoculada. As contagens das bactérias nos rins dos jundiás mantiveram-se entre 10(5 e 10(6UFC/ml até o 21º dia, quando o experimento foi finalizado.As worldwide aquaculture has grown, and intensification in fish raising, the animals are subject to bacterial diseases and others. With the aim of evaluating pathogenicity of Plesiomonas shigelloides for "jundiá" (Rhamdia quelen, different bacterial concentrations (3 x 10(8 e 9 x 10(8 CFU - Colony Former Unit/ml were inoculated via peritoneum. Eigthy four juvenile "jundiá" averaging 24.37 ± 4,28g of weight and 14.42 ± 1,62cm of length were utilized. The inoculated animals were maintained for 21 days, in asbestos water tanks, at similar temperature, pH, alkalinity and hardness conditions. The "jundiás" were slaughtered every other day for counting UFC/ml renal tissue. For daily inspections, it was observed that intraperitoneal inoculation of Plesiomonas shigelloides did not cause any change in the catfishes, regardless inoculated concentration. Bacteria counting in "jundiás" kidneys was maintained between 10(5 and 10(6 UFC/ml until the 21st day, when the experiment was ended.

  12. Reprodução de Stellifer rastrifer (Jordan (Teleostei, Sciaenidae na Baía de Guaratuba, Paraná, Brasil Reproduction of Stellifer rastrifer (Jordan (Teleostei, Sciaenidae at the Guaratuba Bay, Paraná, Brazil

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    Paulo de Tarso da Cunha Chaves

    1997-01-01

    Full Text Available A total of 1312 individuais of S. rastrifer were sampled from March 1994 to September 1996 at the Guaratuba Bay, Southern Brazilian coast. This species is a permanently inhabitant of the mangrove area throughout the year. The weight/length relationship of the species in the region is "In TW =-12,35 + 3,22 In TL", and the individuais may reach 172mm of total length. The analyses of gonadal morphology and gonadossomatic index indicate that S. rastrifer is a multiple spawner species, that reproduces at the mangrove area during a long period of the year. The reproductive activity is more intense during the winter and mainly the spring, when the value of Condition Factor declines and empty folheies are found in the ovaries.

  13. Reproductive biology of Steindachnerina insculpta (Fernandez-Yépez) (Teleostei, Curimatidae) in Furnas reservoir, Minas Gerais, Brazil Biologia reprodutiva de Steindachnerina insculpta (Fernandez-Yépez) (Teleostei, Curimatidae) no reservatório de Furnas, Minas Gerais, Brasil

    OpenAIRE

    Vinicius M. A. Ribeiro; Gilmar B. Santos; Nilo Bazzoli

    2007-01-01

    The 'saguiru' Steindachnerina insculpta, a small teleost detritivorous fish species in Furnas reservoir, upper rio Paraná basin, Minas Gerais, Brazil, has a prolonged period of reproductive activity that extends from September to March, with fractionated spawning. During gonadal maturation, the females showed a low hepatosomatic index, suggesting that hepatic substances are possibly transferred from liver to ovaries. During the reproductive period, this fish had lower stomach repletion and co...

  14. Atividade reprodutiva de peixes (Teleostei e o defeso da pesca de arrasto no litoral norte de Santa Catarina, Brasil Reproductive activity of fish (Teleostei and closed season to shrimp trawling off ther northern coast of Santa Catarina, Brazil

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    Leda M. de Souza

    2007-12-01

    Full Text Available Desembarques de arrasto visando à pesca do camarão sete-barbas, Xiphopenaeus kroyeri, foram acompanhados de 2005 a 2007 no município de São Francisco do Sul, Santa Catarina. Setenta e seis espécies de teleósteos foram registradas como captura incidental e seus indivíduos foram avaliados quanto ao estádio de maturação e Índice de Atividade Reprodutiva. Constatou-se que indivíduos de metade das espécies são capturados com gônadas maduras, em estações que variaram conforme a espécie. Em Isopisthus parvipinnis a atividade enquadrou-se na categoria "muito intensa" na primavera de 2005 e no verão de 2007; em Menticirrhus americanus, Stellifer sp., Pomadasys corvinaeformis, Stellifer brasiliensis, Syacium papillosum, Larimus breviceps, Diapterus rhombeus, Symphurus tessellatus, Chirocentrodon bleekerianus, Pellona harroweri, Anchoa tricolor e Selene setapinnis apenas em uma estação, dependendo da espécie. O verão de 2007, seguido da primavera de 2005, foram as estações em que o arrasto incidiu sobre maior número de espécies em atividade reprodutiva "intensa" ou "muito intensa". No verão de 2007 o arrasto camaroeiro incidiu sobre um conjunto de espécies em atividade reprodutiva maior que na mesma estação em 2006. Atribui-se esse fato à proibição legal do arrasto de camarão no trimestre de outubro-dezembro de 2006, favorecendo a atividade reprodutiva das espécies na estação subseqüente. Recomenda-se que a gestão da pesca camaroeira na região mantenha o defeso de arrasto na primavera, assim beneficiando não apenas as espécies de peixes que desovam nesta estação, mas também aquelas que se preparam para a desova no verão.Shrimp trawling was monitored in southern Brazil in order to study the reproductive status of teleosts occurring as by-catch. From 2005 to 2007 seventy-six fish species were found in this kind of fisheries. Gonad stages were evaluated and the Reproductive Activity Index was calculated. Mature individuals were 50% of the total caught as by-catch. Breeding activity in Isopisthus parvipinnis was "very high" in spring 2005 and summer 2007, and in a particular season (depending on the species in Menticirrhus americanus, Stellifer sp., Pomadasys corvinaeformis, Stellifer brasiliensis, Syacium papillosum, Larimus breviceps, Diapterus rhombeus, Symphurus tessellatus, Chirocentrodon bleekerianus, Pellona harroweri, Anchoa tricolor, and Selene setapinnis. In the summer of 2007, followed by the spring of 2005, trawling caught more species in "high" or "very high" breeding activity. In the summer of 2007 a larger number of species was in reproductive activity than the same season of 2006, due to a closed season in October-December 2006. Aiming to improve the fish breeding activity in this region, it is recommended to close this area for shrimp trawling during the spring. This measure could be positive for both species that spawn in spring and those preparing to spawn in the summer.

  15. Not a simple case - A first comprehensive phylogenetic hypothesis for the Midas cichlid complex in Nicaragua (Teleostei: Cichlidae: Amphilophus).

    Science.gov (United States)

    Geiger, Matthias F; McCrary, Jeffrey K; Schliewen, Ulrich K

    2010-09-01

    Nicaraguan Midas cichlids from crater lakes have recently attracted attention as potential model systems for speciation research, but no attempt has been made to comprehensively reconstruct phylogenetic relationships of this highly diverse and recently evolved species complex. We present a first AFLP (2793 loci) and mtDNA based phylogenetic hypothesis including all described and several undescribed species from six crater lakes (Apoyeque, Apoyo, Asososca Leon, Masaya, Tiscapa and Xiloá), the two great Lakes Managua and Nicaragua and the San Juan River. Our analyses demonstrate that the relationships between the Midas cichlid members are complex, and that phylogenetic information from different markers and methods do not always yield congruent results. Nevertheless, monophyly support for crater lake assemblages from Lakes Apoyeque, Apoyo, A. Leon is high as compared to those from L. Xiloá indicating occurrence of sympatric speciation. Further, we demonstrate that a 'three species' concept for the Midas cichlid complex is inapplicable and consequently that an individualized and voucher based approach in speciation research of the Midas cichlid complex is necessary at least as long as there is no comprehensive revision of the species complex available. PMID:20580847

  16. Cytogenetic divergence between two sympatric species of Characidium (Teleostei, Characiformes, Crenuchidae from the Machado River, Minas Gerais, Brazil

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    Alexandre Rodrigues da Silva

    2006-01-01

    Full Text Available Cytogenetic studies were performed on two sympatric species of Characidium, C. gomesi and C. cf. zebra, from the Grande River basin, Minas Gerais State, Brazil. Although both species had a chromosome number of 50 with a karyotype exclusively consisting of meta- and submetacentric chromosomes, interspecific diversity was detected concerning the size of the two first chromosome pairs of the karyotypes. Active nucleolus organizer regions (NORs were located at the terminal position on the long arm of the 17th pair of C. gomesi and at subterminal position on the long arm of the 23rd pair of C. cf. zebra. For both species the fluorochrome CMA3 stained only the NOR-bearing pair of chromosomes. The heterochromatin pattern also showed some differentiation between these species restricted to the centromeric or pericentromeric region of C. cf. zebra and practically absent in C. gomesi. These data are discussed concerning chromosome diversification in this fish group.

  17. Reinvestigation of vitellogenesis in Caryophyllaeus laticeps (Pallas, 1781) (Cestoda, Caryophyllidea, Caryophyllaeidae), monozoic tapeworm of Abramis brama (Pisces, Teleostei)

    Czech Academy of Sciences Publication Activity Database

    Bruňanská, M.; Drobníková, P.; Mackiewicz, J. S.; Nebesářová, Jana

    2013-01-01

    Roč. 50, č. 1 (2013), s. 73-81. ISSN 0440-6605 Grant ostatní: ERDF(XE) 26220120022 Institutional support: RVO:60077344 Keywords : Caryophyllidea * Caryophyllaeus laticeps * vitellogenesis * vitellocyte * ultrastructure Subject RIV: EA - Cell Biology Impact factor: 0.776, year: 2013

  18. Fine structure of the myxosporean, Henneguya curimata n. sp., parasite of the Amazonian fish, Curimata inormata (Teleostei, Curimatidae).

    Science.gov (United States)

    Azevedo, Carlos; Matos, Edilson

    2002-01-01

    Henneguya curimata n. sp. (Myxozoa, Myxobolidae) is described from the kidney of the teleost Curimata inormata collected in an estuarine region of the Amazon River, near Belém. Brazil. This myxosporean produces large cysts (0.6-1.2 mm in diam.) that represent plasmodia containing all life cycle stages, including spores. The spore body is ellipsoidal (approximately 16.6 microm in length and approximately 6.2 microm in width), and each valve presents a tapering tail (approximately 19.1 microm in length). These valves surround the binucleate sporoplasm cell and two ellipsoidal polar capsules located side-by-side at the same level, measuring 6.5 x 1.2 microm each and containing 10-11 coils of the polar filament. On the basis of its host specificity and on data collected by light and electron microscopy, the organism, H. curimata n. sp. is distinguished as a new species. The taxonomic affinities and morphological comparisons with other similar species of the same genus are discussed. PMID:12120984

  19. Karyotype evolution in Curimatidae (Teleostei, Characiformes) from the Amazon region. II. Centric fissions in the genus Potamorhina.

    Science.gov (United States)

    Feldberg, E; Porto, J I; Nakayama, C M; Bertollo, L A

    1993-04-01

    Using cytogenetic analysis following Giemsa staining, nucleolar organizer region (NOR) staining, and C-banding, three distinct karyotypes in three species of curimatids belonging to the fish genus Potamorhina were identified: 2n = 54/44 M + 10 SM (P. pristigaster), 2n = 56/52 M + 2 SM + 2 ST (P. latior), and 2n = 102/2 M + 2 SM + 98 A (P. altamazonica). A 2n = 54 was considered to be the ancestral diploid number and the different karyotypes were probably the result of centric fissions. Both the NOR pattern and constitutive heterochromatin pattern are species specific. PMID:18469994

  20. Nucleotide sequence, genomic organization and chromosome localization of 5S rDNA in two species of Curimatidae (Teleostei, Characiformes

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    Lessandra Viviane de Rosa Santos

    2006-01-01

    Full Text Available The 5S ribosomal DNA (5S rDNA of higher eukaryotes is organized in repeat units of tandem arrays composed of a 5S rDNA coding region, conserved even among non-related taxa, and a variable non-transcribed spacer sequence (NTS. To contribute to knowledge on the organization and evolution of vertebrate 5S rDNA we used PCR, nucleotide sequencing, Southern blot hybridization and chromosome fluorescence in situ hybridization (FISH to investigate 5S rDNA tandem repeats in the South American Curimatidae fish Steindachnerina insculpta and Cyphocharax modesta. 5S rDNA repeats of 180 base pairs (bp from both species were PCR-generated and sequenced evidencing the shortest 5S rDNA monomer so far described in eukaryote species. Southern blotting revealed that both species contained two tandem 5S rDNA classes, the PCR amplified fragment composed of 180 bp monomers and a class of 1600 bp monomers not detected by PCR. Chromosome mapping of the 5S rDNA repeats identified a major locus in both species and a second minor locus only in C. modesta. The Southern blot and chromosome mapping data indicate the presence of different types of 5S rDNA tandem repeats in the Curimatidae genome.

  1. 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.

  2. Karyotypic characterization of Prochilodus mariae, Semaprochilodus kneri and S. laticeps(Teleostei: Prochilodontidae from Caicara del Orinoco, Venezuela

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    Claudio Oliveira

    2003-09-01

    Full Text Available Fish of the family Prochilodontidae are considered one of the most important components of commercial and subsistence fishery in freshwater environments in South America. This family consists of 21 species and three genera. In the present study, the karyotypes of Prochilodus mariae, Semaprochilodus kneri, and S. laticeps from Caicara del Orinoco, Bolivar State, Venezuela were studied. The species P. mariae, S. kneri and S. laticeps exhibited 2n=54 chromosomes (40 metacentric and 14 submetacentric, a single chromosome pair with nucleolus organizer regions, and a large amount of heterochromatin found at centromeric and pericentromeric positions in almost all chromosomes. The P. mariae specimens studied displayed 0 to 3 supernumerary microchromosomes. The data obtained here confirm the conservative nature of the chromosome number and morphology of Prochilodontidae and reinforce the hypothesis that small structural chromosome rearrangements were the main cause of the karyotypic diversification seen in this group.Os peixes da família Prochilodontidae são considerados um dos componentes mais importantes da pesca comercial e de subsistência em ambientes de água doce na América do Sul. Essa família compreende 21 espécies e três gêneros. No presente estudo foram analisados os cariótipos de Prochilodus mariae, Semaprochilodus kneri e S. laticeps provenientes de Caicara del Orinoco, Estado Bolivar, Venezuela. As espécies P. mariae, S. kneri e S. laticeps apresentaram 2n=54 cromossomos (40 metacêntricos e 14 submetacêntricos, um único par de cromossomos com regiões organizadoras de nucléolo e uma grande quantidade de heterocromatina em posição centromérica e pericentromérica de quase todos os cromossomos. Os espécimes estudados de P. mariae apresentaram de 0 a 3 microcromossomos supranumerários. Os dados obtidos aqui confirmam a natureza conservada do número e da morfologia cromossômica dos Prochilodontidae e reforçam a hipótese de que pequenos rearranjos estruturais foram os principais eventos fixados na diversificação cariotípica do grupo.

  3. Myxobolus myleus n. sp. infecting the bile of the Amazonian freshwater fish Myleus rubripinnis (Teleostei: Serrasalmidae): morphology and pathology.

    Science.gov (United States)

    Azevedo, Carlos; São Clemente, Sérgio Carmona; Casal, Graça; Matos, Patrícia; Alves, Ângela; Al-Quraishy, Saleh; Matos, Edilson

    2012-07-01

    Myxobolus myleus n. sp. is described from the gall-bladder of the freshwater fish Myleus rubripinnis collected near the city of Oriximiná in the Amazon System, Brazil. The spores obtained from the bile contained two equal symmetrical and smooth valves, each forming the spore wall. The spores were large, with a cone-like form, a semi spherical basal contour and measured (in μm) 19.3 ± 0.5 (n = 25) × 8.3 ± 0.5 (n = 25) × 4.0 ± 0.3 (n = 15). The apical end of the spores contained two elongate, equal and pointed conical polar capsules measuring 13.2 ± 0.4 μm (n = 25) in length and 3.0 ± 0.3 μm (n = 15) in width, each having a slightly tapering polar filament with 19 to 21 turns. The polar capsules were extended below at about 4/5 of the total length of the spores. The sporoplasm was binucleate and contained some sporoplasmosomes. All infected fish presented hypertrophy of the gall-bladder due to presence of the brownish parasite floating in the bile. In this paper we describe this new species of myxosporean based on light and ultrastructural observations, together with its associated pathology. PMID:22711511

  4. Potaspora aequidens n. sp. (Microsporidia, Tetramicridae), a parasite infecting the freshwater fish Aequidens plagiozonatus (Teleostei, Cichlidae) from Brazil.

    Science.gov (United States)

    Videira, Marcela; Casal, Graça; Rocha, Sónia; Gonçalves, Evonnildo; Azevedo, Carlos; Velasco, Michele; Matos, Edilson Rodrigues

    2015-07-01

    Morphological and molecular procedures were used to describe a new species of microsporidian that infects the muscles of the sub-opercular region and the caudal fins of the freshwater Aequidens plagiozonatus in Brazil. This microsporidian forms whitish xenomas containing variable number of spores, reaching up to ~0.4 mm in diameter. The mature spores, pyriformin shape, with slightly round ends, measured 3.4 ± 0.5 μm long and 1.9 ± 0.3 μm wide (n = 50) and showed characteristics typical of Microsporidia. The average thickness of the spore wall was 100 (96-108) nm (n = 50), and the spore wall was composed of two layers, a thin, electron-dense exospore and a thick electron-transparent endospore. The exospore was surrounded by a thin, irregular layer of granular material. The anchoring disc was mushroom-like, located in the apical region of the spore in an eccentric position relative to the spore axis, rendering bilateral asymmetry to the spore. The anterior part of the polar filament (PF) (manubrium) measured approximately 125 (122-128) nm thick (n = 30), and the angle of tilt between the anterior PF and the spore axis was ~45°; the posterior part was packed in 8-9 coils. Phylogenetic analysis showed a strongly supported clade containing family Spragueidae Weissenberg, 1976, family Tetramicridae Matthews and Matthews, 1980, Microsporidium sp. RBS1, and Kabatana spp. In conclusion, the available morphological, ultrastructural, and molecular data shows that this microsporidian is a new species belonging to group 4, classified as Potaspora aequidens n. sp. This is the second species described in the genus Potaspora. PMID:25813455

  5. Genetic and Morphological Evidence Implies Existence of Two Sympatric Species in Cyathopharynx furcifer (Teleostei: Cichlidae from Lake Tanganyika

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    Tetsumi Takahashi

    2012-01-01

    Full Text Available Although the cichlid fishes from Lake Tanganyika are treated as a textbook example of adaptive radiation, many taxonomic problems remain unresolved. Cyathopharynx furcifer, which belongs to the currently monospecific genus Cyathopharynx, contains two colour morphs at the southern end of the lake: one has a yellow anal fin, and the other has a black anal fin. Some books for hobbyists of ornamental fish treat these morphs as different species, but taxonomic studies have neither mentioned the existence nor addressed the status of these colour morphs. In the present paper, we analysed these two colour morphs using mitochondrial, microsatellite, morphometric, and meristic data sets. Both molecular and morphological data allowed clear discrimination between these morphs, suggesting the existence of two distinct sympatric species. Three taxonomic species have been described in this genus, and only C. furcifer is currently considered valid. Observations of type specimens of these three nominal species will be needed to determine the scientific names of these colour morphs.

  6. Evolutionary history of the Lake Tanganyika cichlid tribe Lamprologini (Teleostei: Perciformes) derived from mitochondrial and nuclear DNA data

    OpenAIRE

    Sturmbauer, Christian; Salzburger, Walter; Duftner, Nina; Schelly, Robert; Koblmüller, Stephan

    2010-01-01

    Lake Tanganyika comprises a cichlid species flock with substrate-breeding and mouthbrooding lineages. While sexual selection via mate choice on male mating color is thought to boost speciation rates in mouthbrooding cichlids, this is not the case in substrate-breeding lamprologines, which mostly form stable pairs and lack sexual dichromatism. We present a comprehensive reconstruction of the evolution of the cichlid tribe Lamprologini, based upon mtDNA sequences and multilocus nuclear DNA (AFL...

  7. Genetic and Morphological Evidence Implies Existence of Two Sympatric Species in Cyathopharynx furcifer (Teleostei: Cichlidae) from Lake Tanganyika

    OpenAIRE

    Tetsumi Takahashi; Michio Hori

    2012-01-01

    Although the cichlid fishes from Lake Tanganyika are treated as a textbook example of adaptive radiation, many taxonomic problems remain unresolved. Cyathopharynx furcifer, which belongs to the currently monospecific genus Cyathopharynx, contains two colour morphs at the southern end of the lake: one has a yellow anal fin, and the other has a black anal fin. Some books for hobbyists of ornamental fish treat these morphs as different species, but taxonomic studies have neither mentioned the ex...

  8. Psilorhynchus tysoni, a new species of torrent minnow from the Salween River drainage, western Thailand (Teleostei: Psilorhynchidae).

    Science.gov (United States)

    Conway, Kevin W; Pinion, Amanda K

    2016-01-01

    Psilorhynchus tysoni, new species, is described on the basis of 10 specimens, 23.3-53.8 mm SL from the Mae Nam Moei and Hue Mae Song Rivers, in the Salween River drainage in western Thailand. It belongs to the P. nudithoracicus species group and can be distinguished from other members of this group by a combination of characters, including features of body and fin coloration, head shape, and caudal fin-ray, vertebrae, and cephalic lateral-line canal pore counts. Phylogenetic analyses of a mitochondrial DNA data set (comprising 642 bp of cytochrome c oxidase subunit 1 and 1140 bp of cytochrome b) for 12 species of Psilorhynchus and one outgroup taxon resulted in phylogenetic hypotheses in which P. tysoni is a member of a clade equivalent to the P. nudithoracicus species group. Within this group P. tysoni is placed as the sister taxon of a putatively undescribed species of Psilorhynchus from Myanmar. PMID:27395735

  9. A new record of the non-native fish species Butis koilomatodon (Bleeker 1849 (Teleostei: Eleotridae for southeastern Brazil

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    Riguel Feltrin Contente

    2016-05-01

    Full Text Available This work reports the second record of the Indo-Pacific invasive mud sleeper, Butis koilomatodon, for coastal São Paulo in southeastern Brazil, and represents the southernmost record for this species in the southwestern Atlantic Ocean. The risks of a potential invasion mediated by anthropogenic impacts on the area of occurrence are also discussed.

  10. 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

    2015-06-01

    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.

  11. Evidence for panmixia despite barriers to gene flow in the southern African endemic, Caffrogobius caffer (Teleostei: Gobiidae

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    von der Heyden Sophie

    2008-12-01

    Full Text Available Abstract Background Oceanography and life-history characteristics are known to influence the genetic structure of marine species, however the relative role that these factors play in shaping phylogeographic patterns remains unresolved. The population genetic structure of the endemic, rocky shore dwelling Caffrogobius caffer was investigated across a known major oceanographic barrier, Cape Agulhas, which has previously been shown to strongly influence genetic structuring of South African rocky shore and intertidal marine organisms. Given the variable and dynamic oceanographical features of the region, we further sought to test how the pattern of gene flow between C. caffer populations is affected by the dominant Agulhas and Benguela current systems of the southern oceans. Results The variable 5' region of the mtDNA control region was amplified for 242 individuals from ten localities spanning the distributional range of C. caffer. Fifty-five haplotypes were recovered and in stark contrast to previous phylogeographic studies of South African marine species, C. caffer showed no significant population genetic structuring along 1300 km of coastline. The parsimony haplotype network, AMOVA and SAMOVA analyses revealed panmixia. Coalescent analyses reveal that gene flow in C. caffer is strongly asymmetrical and predominantly affected by the Agulhas Current. Notably, there was no gene flow between the east coast and all other populations, although all other analyses detect no significant population structure, suggesting a recent divergence. The mismatch distribution suggests that C. caffer underwent a population expansion at least 14 500 years ago. Conclusion We propose several possible life-history adaptations that could have enabled C. caffer to maintain gene flow across its distributional range, including a long pelagic larval stage. We have shown that life-history characteristics can be an important contributing factor to the phylogeography of marine species and that the effects of oceanography do not necessarily suppress its influence on effective dispersal.

  12. Genetic variability in Astyanax altiparanae Garutti & Britski, 2000 (Teleostei, Characidae from the Upper Paraná River basin, Brazil

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    Maria Dolores Peres

    2005-12-01

    Full Text Available Allozyme data was used to assess the genetic diversity Astyanax altiparanae populations from the floodplain of the Upper Paraná River (PR. Specimens were collected in the southern Brazilian state of Paraná from PR in Porto Rico municipality and Ribeirão Ficha (RF in Ubiratã municipality. The authors used 15% (w/v corn starch gel electrophoresis to identify 21 putative loci for 13 enzymatic systems: Aspartate aminotransferase, 2.6.1.1 (AAT, Acid phosphatase, 3.1.3.2 (ACP, Esterase, 3.1.1.1 (EST, Glycerol-3-phosphate dehydrogenase, 1.1.1.8 (G3PDH, Glucose-6-phosphate dehydrogenase, 1.1.1.49 (G6PDH, Glucose-6-phosphate isomerase, 5.3.1.9 (GPI, Iditol dehydrogenase, 1.1.1.14 (IDDH, Isocitrate dehydrogenase - NADP+, 1.1.1.42 (IDH, L-Lactate dehydrogenase, 1.1.1.27 (LDH, Malate dehydrogenase, 1.1.1.37 (MDH, Malate dehydrogenase - NADP+, 1.1.1.40 (MDHP, Phosphoglucomutase, 5.4.2.2 (PGM, and Superoxide dismutase, 1.15.1.1 (SOD. The proportion of polymorphic loci were estimated as 52.38% in the PR population and 38.10% in the RF population. Expected estimated heterozygosities were 0.1518 ± 0.0493 for the PR population and 0.0905 ± 0.0464 for the RF population. The A. altiparanae heterozygosity data were similar to previous estimates for other PR basin characid species. Allele frequencies were significantly different between the PR and RF populations in respect to some loci (Acp-1, G3pdh-1, Gpi-A, Iddh-1, Mdhp-1 and Mdhp-2. Wright’s statistics for all loci were estimated as Fis = 0.3919, Fit = 0.4804 and Fst = 0.1455. Our results show that the A. altiparanae populations studied are genetically different and have a high degree of genetic variability.

  13. Callionymus petersi, a new species of dragonet from New Ireland, Papua New Guinea, western Pacific Ocean (Teleostei: Callionymidae)

    OpenAIRE

    Fricke, Ronald

    2016-01-01

    A new species of dragonet, Callionymus petersi from northern New Ireland Province, Papua New Guinea, is described on the basis of five specimens collected with dredges and trawls in about 181–207 m depth from off northwestern New Hanover and off Kavieng. The new species is characterized within the subgenus Bathycallionymus by a short head (3.9–4.3 in SL); eye large (2.1–2.3 in head length); preopercular spine with a long, slightly upcurved main tip, a small antrorse serra fo...

  14. Concerted Evolution of Duplicate Control Regions in the Mitochondria of Species of the Flatfish Family Bothidae (Teleostei: Pleuronectiformes)

    OpenAIRE

    Li, Dong-He; Shi, Wei; Munroe, Thomas A.; Gong, Li; Kong, Xiao-Yu

    2015-01-01

    Mitogenomes of flatfishes (Pleuronectiformes) exhibit the greatest diversity of gene rear-rangements in teleostean fishes. Duplicate control regions (CRs) have been found in the mito-genomes of two flatfishes, Samariscus latus (Samaridae) and Laeops lanceolata (Bothidae), which is rare in teleosts. It has been reported that duplicate CRs have evolved in a concerted fashion in fishes and other animals, however, whether concerted evo-lution exists in flatfishes remains unknown. In this study, b...

  15. Concerted Evolution of Duplicate Control Regions in the Mitochondria of Species of the Flatfish Family Bothidae (Teleostei: Pleuronectiformes.

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    Dong-He Li

    Full Text Available Mitogenomes of flatfishes (Pleuronectiformes exhibit the greatest diversity of gene rear-rangements in teleostean fishes. Duplicate control regions (CRs have been found in the mito-genomes of two flatfishes, Samariscus latus (Samaridae and Laeops lanceolata (Bothidae, which is rare in teleosts. It has been reported that duplicate CRs have evolved in a concerted fashion in fishes and other animals, however, whether concerted evo-lution exists in flatfishes remains unknown. In this study, based on five newly sequenced and six previously reported mitogenomes of lefteye flounders in the Bothidae, we explored whether duplicate CRs and concerted evolution exist in these species. Results based on the present study and previous reports show that four out of eleven bothid species examined have duplicate CRs of their mitogenomes. The core regions of the duplicate CRs of mitogenomes in the same species have identical, or nearly identical, sequences when compared to each other. This pattern fits the typical characteristics of concerted evolution. Additionally, phylogenetic and ancestral state reconstruction analysis also provided evidence to support the hypothesis that duplicate CRs evolved concertedly. The core region of concerted evolution is situated at the conserved domains of the CR of the mitogenome from the termination associated sequences (TASs to the conserved sequence blocks (CSBs. Commonly, this region is con-sidered to regulate mitochondrial replication and transcription. Thus, we hypothesize that the cause of concerted evolution of the duplicate CRs in the mtDNAs of these four bothids may be related to some function of the conserved sequences of the CRs during mitochondrial rep-lication and transcription. We hope our results will provide fresh insight into the molecular mechanisms related to replication and evolution of mitogenomes.

  16. Capillostrongyloides morae sp. n. (Nematoda: Capillariidae) from deep-sea fish (Teleostei, Moridae) in the western Mediterranean Sea

    Czech Academy of Sciences Publication Activity Database

    Gonzáles-Solís, David; Carrasson, M.; Pérez-del-Olmo, A.

    2014-01-01

    Roč. 61, č. 1 (2014), s. 63-68. ISSN 0015-5683 R&D Projects: GA ČR GBP505/12/G112 Institutional support: RVO:60077344 Keywords : Gadiformes * Lepidion lepidion * Mora moro * Spain Subject RIV: EG - Zoology Impact factor: 1.147, year: 2014

  17. Three sympatric karyomorphs in the fish Astyanax fasciatus (Teleostei, Characidae do not seem to hybridize in natural populations

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    Maressa Ferreira-Neto

    2012-01-01

    Full Text Available Ninety individuals of the characid fish Astyanax fasciatus (Cuvier, 1819 were collected at Água da Madalena stream (Botucatu, São Paulo, Brazil and analyzed for diploid chromosome number 2n and karyotype composition as well as for the chromosomal location of the 5S and 18S ribosomal DNA (rDNA. Whereas no chromosome differences were associated with sex, three different karyomorphs with diploid chromosome numbers 2n=46, 2n=48 and 2n=50 were found. No intermediate 2n numbers were discovered. The 2n=50 karyomorph showed some differences in 18S rDNA location compared to the two other karyomorphs. Finally, all specimens with the 2n=46 karyomorph showed the presence of a partly heterochromatic macro supernumerary chromosome, which was absent in all individuals with the two other karyomorphs. All these results suggest that indviduals of the three different karyomorphs are not likely to hybridize in the examined populations. Our findings strongly suggest the presence of three separate species (sensu biological species concept easily diagnosed on the basis of differences in the diploid chromosome numbers and other chromosomal markers.

  18. Growth parameters estimates of Maurolicus stehmanni Parin & Kobyliansky 1996 (Teleostei, Sternoptichydae from south and southeastern Brazilian waters

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    Andre Bellucco

    2004-12-01

    Full Text Available This paper on the otolith microstructure analysis of Maurolicus stehmanni presents estimates of the species growth parameters and longevity. The species inhabits the outer shelf and slope of the southern and southeastern Brazilian Exclusive Economic Zone (EEZ. Growth parameters are important for the knowledge of the species' life history and rational management. M. stehmanni constitutes an important link between the initial and final components of the alimentary chain of the open sea ecosystem, being one of the main food items for squids and large pelagic fish. Among the various applied methods those which presented the most coherent values for growth parameters and were best adapted to the von Bertallanfy's equation were: Li= 55mm K= 0.0088/day and to= 5.5 days Maurolicus stehmanni's longevity is of less than one year (around 220 days and the sagita daily otolith rings are useful for the determination of its age.Este estudo, baseado na análise da microestrutura dos otólitos de Maurolicus stehmanni, apresenta estimativas dos parâmetros de crescimento e longevidade para esta espécie que habita a plataforma externa e o talude da ZEE sul-sudeste do Brasil. Estes parâmetros são importantes para o conhecimento da estratégia de vida da espécie e para o manejo deste recurso, que constitui um importante elo entre os componentes iniciais e finais da teia alimentar no ecossistema de mar aberto, sendo um dos principais itens na dieta das lulas e grandes peixes pelágicos. Dentre os vários métodos aplicados, os valores dos parâmetros de crescimento mais coerentes com a estratégia da espécie e que melhor se ajustaram à equação de von Bertallanfy foram: Li= 55mm K= 0.0088/dia e to= 5.5 dias. A espécie vive cerca de 220 dias e as marcas diárias nos otólitos sagita são apropriadas para a determinação da idade.

  19. A review of Galaxiella pusilla (Mack) (Teleostei: Galaxiidae) in south-eastern Australia with a description of a new species.

    Science.gov (United States)

    Coleman, Rhys A; Hoffmann, Ary A; Raadik, Tarmo A

    2015-01-01

    The dwarf galaxias, Galaxiella pusilla (Mack), is a small, threatened freshwater fish from coastal south-eastern Australia. Recent genetic studies, using multiple nuclear and mitochondrial DNA markers, found substantial differences between populations in western Victoria and south Australia ('west region') compared to eastern Victoria, Flinders Island, and Tasmania ('east region') that suggest the presence of a cryptic species. Morphological measurements and meristic counts from multiple populations within each region were undertaken to investigate potential differences between regions. Several characters, found to discriminate between individuals in the regions and to be diagnostic for two taxa, were used to describe a new species, Galaxiella toourtkoourt, for the west region. This is only the second species in the Galaxiidae to exhibit sexual dimorphism. The original description of Galaxiella pusilla, based on five specimens, is revised following examination of a large number of individuals. Both species are considered nationally threatened and are categorised as 'endangered'; the revised distribution of G. pusilla s.s. is reduced by approximately 60%. A number of inconsistencies in the most recent revision of the genus Galaxiella are also corrected. PMID:26624129

  20. Interrelationships of the subgenera of Coryphaenoides (Teleostei: Gadiformes: Macrouridae): synthesis of allozyme, peptide mapping, and DNA sequence data.

    Science.gov (United States)

    Wilson, Raymond R; Attia, Phoebe

    2003-05-01

    DNA sequences of the 12s rRNA mitochondrial gene from 12 species key to the question of the monophyly of the deep-sea fish genus Coryphaenoides (Macrouridae) were analyzed phylogenetically using maximum parsimony and maximum likelihood. The results were compared with those of three previous studies in which allozyme, peptide mapping, and DNA sequence data were similarly analyzed. The allozyme and DNA sequence data suggested that the largest subgenus (Coryphaenoides), which contained most of the species inhabiting continental slopes between approximately 600 and 2000m depth, is monophyletic. Two of the three subgenera containing the species inhabiting abyssal ocean basins below approximately 2000m together formed a sister group to subgenus Coryphaenoides. The macrourids of the abyssal basins and those of the continental slopes thus appear to have experienced separate radiations from a common ancestor. PMID:12695096

  1. Additional record of Batasio merianiensis (Chaudhuri 1913, a catfish (Teleostei: Bagridae in upper Brahmaputra River drainage in Arunachal Pradesh, India

    Directory of Open Access Journals (Sweden)

    L. Tamang

    2014-05-01

    Full Text Available This paper communicates the extension of the distribution range of Batasio merianiensis in Sille River in the upper Brahmaputra drainage, East Siang District, Arunachal Pradesh. Detailed examinations of the specimens revealed existence of few morphological variations against those reported by Heok Hee Ng in 2009 on the following characteristics: by having a longer preanal (70.4-73.4 vs. 66.3-68.2% SL; a longer prepectoral (25.1-29.3 vs. 21.4-25.7% SL; a longer adipose-fin base (22.0-27.6 vs. 16.9-22.2% SL; a shorter post-adipose distance (11.6-13.4 vs.13.4-15.5% SL; a deeper body at anus (depth 18.3-20.8 vs.15.2-18.4% SL and broader head (width 17.6-20.0 vs.13.5-16.2 % HL. Few additional characters of the fish are included along with brief information on its habitat. The LIPUM, the semi-traditional method of fishing in the river is identified as a major threat to this species.

  2. A popular and potentially sustainable fishery resource under pressure–extinction risk and conservation of Brazilian Sciaenidae (Teleostei: Perciformes

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    Ning Labbish Chao

    2015-07-01

    Full Text Available Croakers (Sciaenidae are major fishery resource in Brazil; constituting 22% of marine and 9% of freshwater fishery landings. Croakers are subject to heavy fishing pressure throughout Brazil, but habitat alteration is also an important threat to regional populations. In this regional Sciaenidae assessment, each species was analyzed for relative risk of extinction, including the identification and quantification of the impact of major threats and existing conservation measures, based on application of the Categories and Criteria of the IUCN Red List of Threatened Species. Of the 52 species of Sciaenid fishes (34 marine and 18 freshwater present in Brazilian waters, the majority are at low risk of extinction, with 10 species classified as Data Deficient (DD and 36 as Least Concern (LC. However the Southern black drum (Pogonias cromis, listed as Endangered (EN is the most threatened species in the region, while three other species are classified as Near Threatened (NT. A large portion of Brazilian croakers is landed by small-scale artisanal fisheries, which are scattered along coastal and riverine communities. However, our assessments reveal that available fishery landing statistics may have greatly underestimated the artisanal fishery production and by-catch of Sciaenids. We recommend establishing, with adequate enforcement, coastal and riverine protected areas as well as strategic fishing seasons to improve and maintain the conservation status of Sciaenids and sustainable Sciaenid fisheries.

  3. [Association of sardine fishery, Sardinella aurita (Teleostei: Clupeidae) and environmental variability of the coastal upwelling ecosystem of Nueva Esparta, Venezuela].

    Science.gov (United States)

    Gonzźlez, Leo W; Euán, Jorge; Eslava, Nora; Suniaga, Jesús

    2007-03-01

    The present research is an analysis of Spanish sardine fishing (Sardinella aurita) associated with some climatic and meteorologic parameters of the ecosystem from El Morro Nueva Esparta, Venezuela. The catch and environmental data from the area were taken in the period 1996-2000. Catch data as a function of wind speed, sea surface temperature, air temperature and rain were analyzed by means of simple lineal regression and multiple models. We found a positive correlation of catch with wind speed, and a negative correlation with sea surface temperature, air temperature, and rain. The multiple regression model with intercept had a poor fit, therefore, we made a model without intercept, which improve greatly the fit. A selection of the variables using the forward procedure verified that the independent variables "wind speed" and "air temperature" have a significant relation with catch (p < 0.001) at real time. This method suggests that sea surface temperature and rain have little influence on the catch, and suggests a major availability of resources in the months with low air temperature and the highest wind speed (January-June). Rev. PMID:18457137

  4. Ultrastructural study of spermiogenesis and the spermatozoon of Microcotyle pancerii (Monogenea: Polyopisthocotylea: Microcotylidae), parasite of meagre Argyrosomus regius (Pisces: Teleostei).

    Science.gov (United States)

    Quilichini, Yann; Foata, Joséphine; Marchand, Bernard

    2009-04-01

    The present work deals with the ultrastructure of spermiogenesis and the spermatozoon of Microcotyle pancerii, a gill parasite of meagre Argyrosomus regius collected in Corsican fish farms. Spermiogenesis was rather similar to that observed in other polyopisthocotylean Monogenea. The intercentriolar body was different from that described in digeneans. The nuclear condensation occurred in 2 successive stages. First, during the nuclear migration in the median cytoplasmic process, the nucleus developed a honeycomb-like appearance. Then, after the flagellar fusion, a discontinuous twisting of the chromatin appeared along the nucleus, with this process ending in total nuclear condensation. The structure of the spermatozoon is characterized by 2 axonemes (9 + "1" pattern), a single and continuous field of cortical microtubules, a mitochondrion, and a nucleus. Our findings were compared with various ultrastructural features in order to highlight variability within the group. PMID:18817455

  5. Morphometric and allozyme variation in natural populations and cultured strains of the Nile tilapia Oreochromis niloticus niloticus (Teleostei, Cichlidae)

    OpenAIRE

    Vreven, E.J.; Adépo-Gourène, Béatrice; Agnèse, Jean-François; Teugels, G.G.

    1998-01-01

    Les variations morphométriques et allozymiques de neuf populations naturelle de #Oreochromis niloticus$ et de trois populations d'élevage ont été étudiées. Des différences dans la morphologie et les allozymes ont été observées entre les populations naturelles d'Afrique de l'Ouest et du Nil. Bien que toutes ces populations soient rangées dans la sous-espèce #O. n. niloticus$, la population du Nil est plus proche de la population du lac Edward qui appartient à la sous-espèce #O. n. eduardianus$...

  6. Glyptothorax mibangi, a new species of catfish (Teleostei: Sisoridae) from the Tisa River, Arunachal Pradesh, northeast India.

    Science.gov (United States)

    Darshan, Achom; Dutta, Rashmi; Kachari, Akash; Gogoi, Budhin; Das, Debangshu Narayan

    2015-01-01

    Glyptothorax mibangi, a new sisorid catfish, is described from the Tisa River of Arunachal Pradesh, India. The new species can be distinguished from its congeners in the Ganga-Brahmaputra and Barak-Surma-Meghna basins by the following combination of characters: an obtuse leaf-shaped thoracic adhesive apparatus with a spindle-shaped median depression, skin ridges present over the entire apparatus including the depressed region; ventral surface of pectoral spine and first pelvic-fin ray non-plaited; slender body with depth of 10.4-13.5% SL; caudal peduncle shallow with depth 6.8-8.3% SL; snout long with length 52.9-58.6% HL; and 2+7 gill rakers on the first branchial arch. PMID:26249379

  7. Dynamics of ovarian maturation during the reproductive cycle of Metynnis maculatus, a reservoir invasive fish species (Teleostei: Characiformes

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    Thiago Scremin Boscolo Pereira

    2013-01-01

    Full Text Available In this study, we evaluated the dynamics of ovarian maturation and the spawning processes during the reproductive cycle of Metynnis maculatus. Adult females (n = 36 were collected bimonthly between April 2010 and March 2011. The mean gonadosomatic index (GSI was determined, ovarian and blood samples were submitted for morphometric evaluation and the steroid plasma concentration was determined by ELISA. This species demonstrated asynchronous ovarian development with multiple spawns. This study revealed that, although defined as a multiple spawning species, the ovaries of M. maculatus have a pattern of development with a predominance of vitellogenesis between April and August and have an intensification in spawning in September; in October, a drop in the mean GSI values occurred, and the highest frequencies of post-ovulatory follicles (POFs were observed. We observed a positive correlation between the POF and the levels of 17α-hydroxyprogesterone. Metynnis maculatus has the potential to be used as a source of pituitary tissue for the preparation of crude extracts for hormonal induction; the theoretical period for use is from September to December, but specific studies to determine the feasibility of this approach must be conducted.

  8. Temporal and ontogenetic variations in feeding habits of Hollandichthys multifasciatus (Teleostei: Characidae in coastal Atlantic rainforest streams, southern Brazil

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    Vinícius Abilhoa

    2009-09-01

    Full Text Available Feeding habits of the characin Hollandichthys multifasciatus were investigated. Samplings were made between March 2004 and February 2005 in two black water streams of the coastal Atlantic rainforest in southern Brazil. The diet, evaluated by qualitative and quantitative methods, included aquatic and terrestrial insects, decapods, oligochaetes, plants and spiders. Large individuals feed mainly on plants, terrestrial insects, and spiders, whereas small fish feed basically on plants and oligochaetes. The species showed an omnivorous feeding habit, and its diet was composed of autochthonous (mainly oligochaetes and allochthonous (plants and terrestrial insects material.Neste estudo foram investigados os hábitos alimentares do caracídeo Hollandichthys multifasciatus. Amostras foram obtidas entre março de 2004 e fevereiro de 2005, em dois riachos de água escura da Floresta Atlântica Costeira do Sul do Brasil. A dieta, avaliada por métodos quantitativos e qualitativos, inclui insetos aquáticos e terrestres, decápodes, oligoquetos aquáticos, plantas e aranhas. Os maiores indivíduos alimentaram-se principalmente de plantas, insetos terrestres e aranhas, enquanto que os menores indivíduos alimentaram-se basicamente de plantas e oligoquetos aquáticos. A espécie apresentou hábito alimentar onívoro, e sua dieta no riacho estudado foi composta por material autóctone (principalmente oligoquetos aquáticos e alóctone (plantas e insetos terrestres.

  9. Two new species of Apistogramma Regan (Teleostei: Cichlidae) from the rio Trombetas, Pará State, Brazil

    OpenAIRE

    Sven O Kullander; Efrem J. G. Ferreira

    2005-01-01

    Apistogramma angayuara is described from the rio Trombetas close to the cachoeira Vira Mundo where it is found in association with rapids. It is assigned to the A. pertensis species group, distinguished by the following characters in combination: three prominent stripes composed of dark spots along the sides of the abdomen, 2 vs. 3 postlachrymal infraorbital pores, 5 vs. 4 dentary pores, low dorsal fin in adult males, and presence of a caudal spot. It is the smallest species of Apistogramma r...

  10. Two new species of Apistogramma Regan (Teleostei: Cichlidae from the rio Trombetas, Pará State, Brazil

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    Sven O Kullander

    2005-09-01

    Full Text Available Apistogramma angayuara is described from the rio Trombetas close to the cachoeira Vira Mundo where it is found in association with rapids. It is assigned to the A. pertensis species group, distinguished by the following characters in combination: three prominent stripes composed of dark spots along the sides of the abdomen, 2 vs. 3 postlachrymal infraorbital pores, 5 vs. 4 dentary pores, low dorsal fin in adult males, and presence of a caudal spot. It is the smallest species of Apistogramma reported so far, with the largest male 24.7 mm SL and the largest female 22.7 mm SL, and the first cichlid species found with a significant proportion of rhizopods in the stomach content. Apistogramma salpinction is described from lentic habitats at the margin of road BR-163, circa 70 km from Cachoeira Porteira village, in a swamp most probably connected to the igarapé Caxipacoré. It is compared to members of the Apistogramma cacatuoides group with which it shares prolonged anterior dorsal fin lappets and marginal caudal fin streamers in adult males. It is distinguished from all other species of Apistogramma by the color pattern which includes a lateral band and abdominal stripes that become darker and have much lighter interspaces on the caudal peduncle, and a caudal spot that is divided into elongated blotches continuing the lateral band and upper two abdominal stripes, respectively.Apistogramma angayuara é descrita para o rio Trombetas próximo à cachoeira Vira Mundo, onde é encontrada associada com corredeiras. É a menor espécie de Apistogramma até agora registrada, com o maior macho atingindo 24,7 mm CP, e a maior fêmea 22,7 mm CP. Trata-se do primeiro registro de uma espécie de ciclideo com grande quantidade de rizopodos em seu conteúdo estomacal. Apistogramma angayuara pertence ao grupo A. pertensis e difere das demais espécies deste grupo pela seguinte combinação de caracteres: três conspícuas séries de pontos escuros ao longo da região abdominal, 2 vs. 3 poros infra-orbitais pós-lacrimais, e 5 vs. 4 poros dentários, nadadeira dorsal baixa em machos adultos, e presença de uma mancha caudal grande. Apistogramma salpinction é descrita de habitats lênticos localizados na margem da BR-163, cerca de 70 km da vila de Cachoeira Porteira, em um alagadiço que provavelmente está conectado ao igarapé Caxipacoré, e é semelhante a membros do grupo Apistogramma cacatuoides com o qual compartilha as membranas anteriores da nadadeira dorsal prolongadas e faixas marginais na nadadeira caudal em machos adultos. Entretanto, difere pelo padrão de colorido que inclui uma faixa lateral e listras abdominais mais escuras e com interespaços mais claros no pedúnculo caudal, que se prolongam sobre a base da nadadeira caudal em uma pinta caudal dividida em manchas alongadas continuando a faixa lateral e duas listras abdominais, respectivamente.

  11. Apistogramma cinilabra sp. n. : description of a potentially endangered endemic cichlid species (Teleostei : Perciformes : Cichlidae) from the Departamenio Loreto, Peru

    OpenAIRE

    Romer, U.; Duponchelle, Fabrice; Diaz, A. V.; Davilla, C. G.; Sirvas, S.; Catchay, C. D.; Renno, Jean-François

    2011-01-01

    A new species of Apistogramma is described from Peru, based on a total of 35 specimens collected in a small forest lake in the wider catchment of the Rio Itaya about 80 kilometres south of Iquitos, Departamento Loreto (approximately 73 degrees 35' W / 04 degrees 24' S). Apistogramma cinilabra sp. n. is separated from all other Apistogramma species by the combination of (in adult males) strikingly red base of pectoral, red spots on chest, (in aggression and display) light ash-grey lips, except...

  12. Apistogramma ortegai (Teleostei: Cichlidae), a new species of cichlid fish from the Ampyiacu River in the Peruvian Amazon basin.

    Science.gov (United States)

    Britzke, Ricardo; Oliveira, Claudio; Kullander, Sven O

    2014-01-01

    Apistogramma ortegai, new species, is described from small streams tributaries of the Ampiyacu River near Pebas, in eastern Peru. It belongs to the Apistogramma regani species group and is distinguished from all other species of Apistogramma by the combination of contiguous caudal spot to bar 7, presence of abdominal stripes, short dorsal-fin lappets in both sexes, absence of vertical stripes on the caudal fin, and reduced number of predorsal and prepelvic scales. PMID:25283927

  13. A Ploidy Difference Represents an Impassable Barrier for Hybridisation in Animals. Is There an Exception among Botiid Loaches (Teleostei: Botiidae)?

    Science.gov (United States)

    Bohlen, Jörg; Šlechtová, Vendula; Šlechta, Vlastimil; Šlechtová, Vera; Sember, Alexandr; Ráb, Petr

    2016-01-01

    One of the most efficient mechanisms to keep animal lineages separate is a difference in ploidy level (number of whole genome copies), since hybrid offspring from parents with different ploidy level are functionally sterile. In the freshwater fish family Botiidae, ploidy difference has been held responsible for the separation of its two subfamilies, the evolutionary tetraploid Botiinae and the diploid Leptobotiinae. Diploid and tetraploid species coexist in the upper Yangtze, the Pearl River and the Red River basins in China. Interestingly, the species 'Botia' zebra from the Pearl River basin combines a number of morphological characters that otherwise are found in the diploid genus Leptobotia with morphological characters of the tetraploid genus Sinibotia, therefore the aim of the present study is to test weather 'B.' zebra is the result of a hybridisation event between species from different subfamilies with different ploidy level. A closer morphological examination indeed demonstrates a high similarity of 'B.' zebra to two co-occurring species, the diploid Leptobotia guilinensis and the tetraploid Sinibotia pulchra. These two species thus could have been the potential parental species in case of a hybrid origin of 'B.' zebra. The morphologic analysis further reveals that 'B.' zebra bears even the diagnostic characters of the genera Leptobotia (Leptobotiinae) and Sinibotia (Botiinae). In contrast, a comparison of six allozyme loci between 'B.' zebra, L. guilinensis and S. pulchra showed only similarities between 'B.' zebra and S. pulchra, not between 'B.' zebra and L. guilinensis. Six specimens of 'B.' zebra that were cytogenetically analysed were tetraploid with 4n = 100. The composition of the karyotype (18% metacentric, 18% submetacentric, 36% subtelocentric and 28% acrocentric chromosomes) differs from those of L. guilinensis (12%, 24%, 20% and 44%) and S. pulchra (20%, 26%, 28% and 26%), and cannot be obtained by any combination of genomes from L. guilinensis and S. pulchra. Phylogenetic reconstructions based on sequence data of the mitochondrial cytochrome b gene and the nuclear RAG-1 gene invariably places 'Botia' zebra as sister species to S. pulchra, while L. guilinensis is only distantly related. The presented combination of genetic data demonstrates that 'B.' zebra is not the result of a hybridisation, but a species of tetraploid genus Sinibotia with a striking morphological evolution towards an enormous similarity with a co-occurring, but not directly related species. The complete lack of knowledge of the ecology of these species, their main predators or their ecological interactions hampers any conclusion regarding the evolutionary advantage of such adaptation. PMID:27442252

  14. Phylogeny of the Labeoninae (Teleostei, Cypriniformes) based on nuclear DNA sequences and implications on character evolution and biogeography

    Institute of Scientific and Technical Information of China (English)

    Lanping ZHENG; Junxing YANG; Xiaoyong CHEN

    2012-01-01

    The Labeoninae is a subfamily of the family Cyprinidae,Order Cypriniformes.Oromandibular morphology within the Labeoninae is the greatest among cyprinid fishes.Although several phylogenetic studies about labeonines have been undertaken the results have been inconsistent and a comprehensive phylogeny is needed.Further,an incongruence between morphological and molecular phylogeny requires a systematic exploration of the significance of morphological characters on the basis of the molecular phylogeny.In this study,a total of 292 nucleotide sequences from 73 individuals (representing 24 genera and 73 species) of Labeoninae were analyzed.The results of the phylogenetic analysis indicate that there are four major clades within Labeoninae and three monophyletic lineages within the fourth clade.Results of the character evolution show that all oromandibular morphological characters are homoplastically distributed on the molecular phylogenetic tree and suggests that these characters evolved several times during the history of labeonines.In particular,the labeonine,a specific disc on the lower lip,has been acquired three times and reversed twice.These morphological characters do not have systematic significance but can be useful for taxonomy.The results of biogeography suggest that the Labeoninae originated from Southeast Asia and separately dispersed to Africa,East Asia and South Asia.

  15. A redescription of grey pomfret Pampus cinereus (Bloch,1795) with the designation of a neotype (Teleostei:Stromateidae)

    Institute of Scientific and Technical Information of China (English)

    LIU Jing; LI Chunsheng; NING Ping

    2013-01-01

    Pampus cinereus (Bloch,1795) (Stromateidae),a species believed to be widely distributed throughout the Indo-Western Pacific region,was redescribed and a neotype was designated.The designation of a neotype was necessary because of ambiguous data in Bloch's original description and the loss of the original type specimen.Morphological data indicated that 10 recently-collected specimens from the coasts of southern China agreed well with Bloch's original description and figure ofP.cinereus.A neotype for this species was selected from among the 10 specimens,and a detailed description is presented in this paper.

  16. Enzymatic Activity in the Gastrointestinal Tract of Pimelodus maculatus (Teleostei, Siluriformes) in Two Neotropical Reservoirs with Different Trophic Conditions

    OpenAIRE

    Silvana Duarte; Marcelo Bemquerer; Francisco Gerson Araújo

    2015-01-01

    Enzymatic activities for digestion of proteins and carbohydrates were compared among three organs of the digestive system of Pimelodus maculatus in two reservoirs with different trophic conditions during the winter of 2006. The aim was to test the hypothesis that enzymatic activity for the digestion of proteins and carbohydrates differed among organs and that such activities differ between the trophic state of the environment. Enzymatic activities were determined through the assays of specifi...

  17. Comparative morphology of the gonadal structure related to reproductive strategies in six species of neotropical catfishes (Teleostei: Siluriformes).

    Science.gov (United States)

    Melo, Rafael Magno Costa; Arantes, Fábio Pereira; Sato, Yoshimi; dos Santos, José Enemir; Rizzo, Elizete; Bazzoli, Nilo

    2011-05-01

    We studied the relationship between the morphology of the reproductive system and the reproductive strategies of six neotropical catfishes using macroscopic and microscopic analyses. The reproductive system of the examined Siluriformes showed diversified characteristics, but permitted their being grouped according to three reproductive strategies: pelagic spawning, demersal spawning, and internally fertilizing. The pelagic spawners Pseudoplatystoma corruscans and Conorhynchos conirostris have testes that are characterized by filiform lobes, absence of testicular secretion, full-grown oocytes of small diameter, thin zona radiata, and cuboidal follicular cells. Pimelodus maculatus is morphologically distinct from the other two pelagic spawners catfishes due to the presence of testicular secretion. The demersal spawners Lophiosilurus alexandri and Rhinelepis aspera possess homogeneous testicular secretion, large mature oocytes, and columnar follicular cells. The most specialized reproductive system was observed in the internally fertilizing Trachelyopterus galeatus, which possesses a seminal vesicle accessory to the testes, spermatozoa with elongated nuclei that form spermatozeugmata, and a secretory ovarian lamellar epithelium that is associated with sperm storage. The reproductive system observed in Neotropical catfishes showed a relationship associated with the type of fertilization and the reproductive strategies of the six species studied. PMID:21246599

  18. FEEDING HABITS OF THE SHARP SNOUT SEA BREAM, DIPLODUS PUNTAZZO (CETTI, 1777) (TELEOSTEI: SPARIDAE) FROM BENGHAZI COAST, EASTERN LIBYA

    OpenAIRE

    Hana M Saleh* and Mohammad El-Mor

    2015-01-01

    The feeding habits of 500 specimens of Diplodus puntazzo (family: Sparidae), inhabiting Benghazi Mediterranean coast, were studied monthly from September 2013 to August 2014. The annual diet composition, monthly variations in the diet composition, the variations of diet with length and the intensity of feeding were studied. Diplodus puntazzo feed on a wide variety of prey types: crustaceans) 40.1%), cephalopods (22.1%), green algae (17.7 %), mollusks (5.2%), polychaetes (1.1%) and sediments (...

  19. A new Pseudophoxinus (Teleostei, Cyprinidae species from Southwestern Anatolia, with remarks on the distribution of the genus in western Anatolia

    Directory of Open Access Journals (Sweden)

    Fahrettin Küçük

    2013-07-01

    Full Text Available Pseudophoxinus burduricus sp. n. is described from drainages of Salda and Burdur lakes, southwestern Turkey. It is distinguished from other Anatolian Pseudophoxinus by a combination of characters: lateral line incomplete, with 21–39 (commonly 26–37 perforated scales and 47–57+1-2 scales in lateral series; 10½–12½ scale rows between lateral line and dorsal fin origin, 3–4(5 scale rows between lateral line and the pelvic fin origin; dorsal fin commonly with 7½ branched rays; anal fin commonly with 6½ branched rays; 7–8(9 gill rakers on the first branchial arch; a faint and diffuse epidermal black stripe from eye to caudal fin base in alive and preserved individuals; mouth slightly subterminal, tip of mouth cleft on about level of lower margin of eye; snout rounded, its length greater than eye diameter. Comparison is given with all Pseudophoxinus species from western Anatolia.

  20. Molecular phylogeny of the Southeast Asian freshwater fish family Botiidae (Teleostei: Cobitoidea( and the origin of polyploidy in their evolution

    Czech Academy of Sciences Publication Activity Database

    Šlechtová, Vendula; Bohlen, Jörg; Freyhof, J.; Ráb, Petr

    2006-01-01

    Roč. 39, 2 (2006), s. 529-541. ISSN 1055-7903 R&D Projects: GA ČR GA206/05/2556; GA ČR GA206/00/0668; GA AV ČR IAA600450508; GA AV ČR IBS5045111 Institutional research plan: CEZ:AV0Z50450515 Keywords : loach fishes * tetraploidy * polyploidisation Subject RIV: EB - Genetics ; Molecular Biology Impact factor: 3.528, year: 2006

  1. Phylogenetic analysis of the order Pleuronectiformes (Teleostei based on sequences of 12S and 16S mitochondrial genes

    Directory of Open Access Journals (Sweden)

    Marisa F.C. Azevedo

    2008-01-01

    Full Text Available The fish order Pleuronectiformes, composed of 14 families, has two suborders: Psettodoidei (with one family and Pleuronectoidei (with thirteen families. The relationships among families of Pleuronectoidei and among the genera of their families have extensively been debated and a consensus has not yet been reached. In the present study, partial sequences of the 12S and 16S mitochondrial rRNA genes were obtained from 19 species belonging to the families Achiridae, Bothidae, Cynoglossidae, Paralichthyidae, Pleuronectidae, Scophthalmidae, and Soleidae. Additional sequences of 42 pleuronectiform species were obtained from GenBank. Phylogenetic analyses were conducted by the methods of maximum-parsimony, maximum-likelihood and Bayesian inference. Our results corroborate the monophyletic status of all families, excluding Paralichthyidae. In the family Achiridae, the genus Catathyridium (freshwater was the sister group of Trinectes (saltwater, and Hypoclinemus (freshwater was the sister group of Achirus (saltwater. Assuming that the putative ancestor of achirids lived in saltwater, it is suggested that the freshwater habitats in South America were colonized independently by different achirid lineages.

  2. Phylogenetic relationships within the speciose family Characidae (Teleostei: Ostariophysi: Characiformes) based on multilocus analysis and extensive ingroup sampling

    OpenAIRE

    Vari Richard P; Ortí Guillermo; Benine Ricardo C; Mariguela Tatiane C; Abe Kelly T; Avelino Gleisy S; Oliveira Claudio; Corrêa e Castro Ricardo M

    2011-01-01

    Abstract Background With nearly 1,100 species, the fish family Characidae represents more than half of the species of Characiformes, and is a key component of Neotropical freshwater ecosystems. The composition, phylogeny, and classification of Characidae is currently uncertain, despite significant efforts based on analysis of morphological and molecular data. No consensus about the monophyly of this group or its position within the order Characiformes has been reached, challenged by the fact ...

  3. A DNA Barcode-Based Evaluation of the Southeast Asian Catfish Genus Hemibagrus Bleeker, 1862 (Teleostei: Siluriformes; Bagridae)

    OpenAIRE

    Dodson, Julian J.; Lecomte, Frédéric

    2015-01-01

    Species of the genus Hemibagrus are large river catfishes found throughout South-east Asia. The complexity of the region’s biogeographical history and the lack of well-defined morphological characters render the taxonomy and phylogenetic reconstruction of Hemibagrus problematical. Early molecular studies of the H. nemurus species group revealed extensive genetic subdivisions, the taxonomic status of which remained unclear. A recent, morphologically-based, revision of the genus provides an opp...

  4. Population structure, growth and fishery yield of Leporinus acutidens (Valenciennes, 1837 (Teleostei: Anostomidae in Yacyretá Reservoir (Argentina

    Directory of Open Access Journals (Sweden)

    Patricia R. Araya

    2008-03-01

    Full Text Available The population structure and dynamics of Leporinus acutidens (Valenciennes, 1837, upstream from Yacyretá Dam (Upper Paraná River, Argentina were analyzed for their relation to age, condition factor, growth, mortality and fishery yield. The pre- (1990-94 and post- (1995-98 filling phases of the reservoir were compared with regard to age structure, condition factor, and the length/weight relationship of fish. Fish sampling was carried out at four sampling sites following a longitudinal gradient along the river. The catches took place monthly using eight monofilament gillnets (mesh 40 to 160 mm. The growth marks on the scales were annual (9-year maximum. The study of the variation in the monthly averages of the scale marginal increments revealed that the period of the growth ring formation shifted from winter to spring in the post-filling phase. The length/weight relationship coefficient (b was higher after dam closing. The condition factor increased before the reproduction period and during late summer, reaching maximum values in the post-filling phase, and especially at the sampling site placed within the reservoir region. The von Bertalanffy growth coefficient k for both sexes was 0.16, and the asymptotic length L" reached 338 mm. Natural mortality during the whole study period, according to Pauly's equation, was 0.25 years -1 and total mortality was 0.37 years -1. The Beverton-Holt yield per recruit (Y/R model attained 57.23 g, with a maximum sustainable yield (MSY of 70.75 g. Low total mortality was associated with the lack of commercial exploitation of the species.A população de Leporinus acutidens (Valenciennes, 1837, a montante da barragem de Yacyretá (Alto Paraná, Argentina foi analisada em relação à idade, crescimento, condição nutricional, mortalidade e rendimento da pesca, sendo realizadas comparações na estrutura etária, condição nutricional e relação peso-comprimento nos períodos pré (1990-94 e pós (1995-98 represamento. As amostragens foram conduzidas em quatro localidades ao longo do rio. As capturas foram realizadas mensalmente com oito redes monofilamento (malhagens de 40 a 160 mm. Os anéis de crescimento nas escamas são formados anualmente (máximo 9 anos. A análise das variações mensais na média do incremento marginal das escamas revelou que o período de formação dos anéis de crescimento alterou do inverno para a primavera após o represamento. Já o coeficiente da relação peso/comprimento (b foi maior, para ambos os sexos, após o represamento. O fator de condição apresentou-se mais elevado antes do período reprodutivo e no final do verão, alcançando valores máximos após o represamento, especialmente em locais dentro do reservatório. O valor do coeficiente k da curva de crescimento de von Bertalanffy foi 0.16 e o comprimento assintótico L" alcançou 338 mm. A mortalidade natural, estimada a partir da equação de Pauly, foi de 0.25 year-1 e a mortalidade total de 0.37 year-1. O rendimento por recruta, estimado pelo modelo de Beverton-Holt (Y/R atingiu 57.23 g, com um rendimento máximo sustentável (RMS de 70.75 g. A baixa mortalidade total foi associada com a inexistência de uma exploração comercial relevante do estoque.

  5. Phylogenetic relationships and biogeographical patterns in Circum-Mediterranean subfamily Leuciscinae (Teleostei, Cyprinidae inferred from both mitochondrial and nuclear data

    Directory of Open Access Journals (Sweden)

    Perea Silvia

    2010-08-01

    Full Text Available Abstract Background Leuciscinae is a subfamily belonging to the Cyprinidae fish family that is widely distributed in Circum-Mediterranean region. Many efforts have been carried out to deciphering the evolutionary history of this group. Thus, different biogeographical scenarios have tried to explain the colonization of Europe and Mediterranean area by cyprinids, such as the "north dispersal" or the "Lago Mare dispersal" models. Most recently, Pleistocene glaciations influenced the distribution of leuciscins, especially in North and Central Europe. Weighing up these biogeographical scenarios, this paper constitutes not only the first attempt at deciphering the mitochondrial and nuclear relationships of Mediterranean leuciscins but also a test of biogeographical hypotheses that could have determined the current distribution of Circum-Mediterranean leuciscins. Results A total of 4439 characters (mitochondrial + nuclear from 321 individuals of 176 leuciscine species rendered a well-supported phylogeny, showing fourteen main lineages. Analyses of independent mitochondrial and nuclear markers supported the same main lineages, but basal relationships were not concordant. Moreover, some incongruence was found among independent mitochondrial and nuclear phylogenies. The monophyly of some poorly known genera such as Pseudophoxinus and Petroleuciscus was rejected. Representatives of both genera belong to different evolutionary lineages. Timing of cladogenetic events among the main leuciscine lineages was gained using mitochondrial and all genes data set. Conclusions Adaptations to a predatory lifestyle or miniaturization have superimposed the morphology of some species. These species have been separated into different genera, which are not supported by a phylogenetic framework. Such is the case of the genera Pseudophoxinus and Petroleuciscus, which real taxonomy is not well known. The diversification of leuciscine lineages has been determined by intense vicariant events following the paleoclimatological and hydrogeological history of Mediterranean region. We propose different colonization models of Mediterranean region during the early Oligocene. Later vicariance events promoted Leuciscinae diversification during Oligocene and Miocene periods. Our data corroborate the presence of leuciscins in North Africa before the Messinian salinity crisis. Indeed, Messinian period appears as a stage of gradually Leuciscinae diversification. The rise of humidity at the beginning of the Pliocene promoted the colonization and posterior isolation of newly established freshwater populations. Finally, Pleistocene glaciations determined the current European distribution of some leuciscine species.

  6. Révision systématique du genre Pollimyrus (Teleostei, Mormyridae) en Afrique de l'Ouest

    OpenAIRE

    Bigorne, Rémy

    1990-01-01

    L'etude de séries de #Pollimyrus$ provenant d'une zone comprise entre le Sénégal et les rivières côtières du Cameroun, ainsi que du Tchad, a permis de clarifier la position taxonomique de ce genre en Afrique de l'ouest en validant l'existence de quatre espèces : #P. isidori$, #P. adspersus$, #P. kingsleyae$ et #P. petricolus$. #P. kingsleyae eburneensis$ n. ssp. est décrite. Les problèmes soulevés par l'hétérogénéité morphologique du genre sont brièvement discutés. (Résumé d'auteur)...

  7. Reproductive biology of Plagioscion magdalenae (Teleostei: Sciaenidae (Steindachner, 1878 in the bay of Marajo, Amazon Estuary, Brazil

    Directory of Open Access Journals (Sweden)

    Nayara Barbosa Santos

    2010-01-01

    Full Text Available Plagioscion magdalenae (pacora is a commercially important benthopelagic sciaenid and widely distributed in the Amazon River basin. The present study describes the reproductive biology of this species in the bay of Marajo, Amazon Estuary, Brazil. The gonadal development stage, age and size at first sexual maturity (L50, sex ratio, and reproductive strategy were determined. The data were collected bi-monthly from December 2005 to October 2006. A total of 251 specimens were examined, with the total length (TL ranging between 220 and 590 mm. The weight-length relationship for females, males and grouped sexes was highly significant, showing a positive allometry. The L50 was of 279 mm for grouped sexes, with 305 mm and 269 mm TL for females and males respectively. The sex ratio for the total number of individuals favored the males (2.02 males: 1 female. Macroscopically, the gonads were classified as immature, maturing, mature and spent. Considering the macro and microscopic evaluation of the gonads, an extended spawning period, mainly in August to February, was observed.Plagioscion magdalenae (pescada-curuca é um sciaenídeo bentopelágico, de importância comercial, amplamente distribuído na bacia do rio Amazonas. O objetivo deste trabalho foi descrever a biologia reprodutiva dessa espécie na baía do Marajó, estuário Amazônico, Brasil. Neste estudo foi determinado o estádio do desenvolvimento gonadal, tamanho de primeira maturação gonadal (L50, proporção entre sexos, época e o tipo de desova. A coleta foi realizada bimestralmente no período de dezembro de 2005 a outubro de 2006. Foi examinado um total de 251 exemplares, variando entre 220 e 590 mm de comprimento total (CT. A relação peso-comprimento para fêmeas, machos e sexos agrupados foi altamente significativa, com alometria positiva. O L50 foi de 279 mm considerando sexos agrupados, 305 e 269 mm CT para fêmeas e machos respectivamente. A proporção entre sexos para o total de indivíduos foi favorável aos machos (2,02 machos: 1 fêmea. Macroscopicamente, as gônadas foram classificadas em imatura, em maturação, matura e desovada. Considerando-se as avaliações macro e microscópicas das gônadas, foi registrado um período prolongado de desova, principalmente entre agosto e fevereiro.

  8. Aporocotyle michaudi n. sp. (Digenea: Aporocotylidae) from the emerald rock cod, Trematomus bernacchii (Teleostei: Perciformes) in Antarctica.

    Science.gov (United States)

    Santoro, Mario; Cipriani, Paolo; Pankov, Plamen; Lawton, Scott P

    2015-10-01

    Aporocotyle michaudi n. sp. is described from the gill blood vessels of the emerald rock cod Trematomus bernacchii in the Ross Sea, Antarctica. It is distinguished from all other species of Aporocotyle by its body tegument showing single conical spines, spinous buccal capsule, and genital atrium positioned medially; all congeners described to date are characterized by clusters of tegumental spines, unspined buccal capsule and genital atrium located in the lateral part of the body. Aporocotyle michaudi n. sp. clearly differs from A. notothenia (the only other species of Aporocotyle found in a perciform fish) in its shape and arrangement of tegumental spines, buccal capsule features, location of genital atrium, body size, ratio of esophagus/body length, anterior caeca/posterior caeca ratio, number of testes, cirrus sac and ovary size and shape, and host. The new species is easily distinguished from A. argentinensis (the species that most closely resembles A. michaudi) by the shape and arrangement of tegumental spines, buccal capsule features, genital atrium location, left anterior caecum longer than right, esophagus/body length ratio, number of testes, cirrus sac size and shape, host and molecular analyses. Phylogenetic analyses of partial 28S rDNA genetic data showed that sequences representing the new species form a distinct clade with all other sequences for species of Aporocotyle and appear basal within the genus. Aporocotyle michaudi n. sp. represents the only species of genus described in Antarctica. PMID:25979611

  9. On a record of two alien fish species (Teleostei: Osphronemidae from the natural waters of Chennai, Tamil Nadu, India

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    J.D. Marcus Knight

    2015-03-01

    Full Text Available Aquarium trade has been the source of many alien species being introduced into the natural waters of Chennai.  Trichopsis vittata and Macropodus opercularis are being reported for the first from Chennai. However,  contrary to the propagule pressure theory both these species are not common in the aquarium trade, raising speculations of inter-basin water transfer playing a role in introducing non-native species into an ecosystem.  

  10. A New Extinct Species Of Pikeperch Sander Svetovidovi (Teleostei, Percidae From The Late Miocene Of Southern Ukraine

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    Kovalchuk O. M.

    2015-08-01

    Full Text Available A new species of pikeperch from the Upper Miocene strata of Ukraine (Egorovka 2 locality, MN 12 is described in the paper. Extinct species Sander svetovidovi sp. n. differs from the Miocene and recent taxa of the genus Sander by the configuration of the quadrate bone, form and sizes of the lateral condyle and also presence of additional double crista on the anterior inferior edge of quadratum.

  11. Gene rearrangements and evolution of tRNA pseudogenes in the mitochondrial genome of the parrotfish (Teleostei: Perciformes: Scaridae).

    Science.gov (United States)

    Mabuchi, Kohji; Miya, Masaki; Satoh, Takashi P; Westneat, Mark W; Nishida, Mutsumi

    2004-09-01

    Genomic size of animal mitochondrial DNA is usually minimized over time. Thus, when regional duplications occur, they are followed by a rapid elimination of redundant material. In contrast to this general view, we report here long-sustained tRNA pseudogenes in the mitochondrial genome (mitogenome) of teleost fishes of the family Scaridae (parrotfishes). During the course of a molecular phylogenetic study of the suborder Labroidei, we determined the complete nucleotide sequence of the mitogenome for a parrotfish, Chlorurus sordidus, and found a gene rearrangement accompanied by a tRNA pseudogene. In the typical gene order of vertebrates, a tRNA-gene cluster between ND1 and ND2 genes includes tRNA(Ile) (I), tRNA(Gln) (Q), and tRNA(Met) (M) genes in this order (IQM). However, in the mitogenome of the parrotfish, the tRNA(Met) gene was inserted between the tRNA(Ile) and the tRNA(Gln) genes, and the tRNA(Gln) gene was followed by a putative tRNA(Met) pseudogene (psiM). Such a tRNA gene rearrangement including a pseudogene (IMQpsiM) was found in all of the 10 examined species, representing 7 of the 10 currently recognized scarid genera. All sister groups examined (20 species of Labridae and a single species of Odacidae) had the typical gene order of vertebrate mitogenomes. Phylogenetic analysis of the tRNA(Met) genes and the resulting pseudogenes demonstrated that the ancestral tRNA(Met) gene was duplicated in a common ancestor of the parrotfish. Based on the fossil record, these results indicate that the pseudogenes have survived at least 14 million years. Most of the vertebrate mitochondrial gene rearrangements involving the IQM region have held the tRNA(Met) gene just upstream of the ND2 gene, and even in a few exceptional cases, including the present ones, the tRNA pseudogenes have been found in that position. In addition, most of these tRNA(Met) pseudogenes maintained clover-leaf secondary structures, with the remainder sustaining the clover-leaf structure in the "top half (TpsiC and acceptor arms). Considering their potential secondary structures (holding "top halves" of the clover-leaf structures), locations within mitogenomes (flanking the 5' ends of the ND2 genes) and stabilities over time (survived at least 14 Myr), it is likely that the tRNA pseudogenes retain function as punctuation marks for mitochondrial ND2 mRNA processing. PMID:15553084

  12. Phylogenetic relationships within the speciose family Characidae (Teleostei: Ostariophysi: Characiformes based on multilocus analysis and extensive ingroup sampling

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    Vari Richard P

    2011-09-01

    Full Text Available Abstract Background With nearly 1,100 species, the fish family Characidae represents more than half of the species of Characiformes, and is a key component of Neotropical freshwater ecosystems. The composition, phylogeny, and classification of Characidae is currently uncertain, despite significant efforts based on analysis of morphological and molecular data. No consensus about the monophyly of this group or its position within the order Characiformes has been reached, challenged by the fact that many key studies to date have non-overlapping taxonomic representation and focus only on subsets of this diversity. Results In the present study we propose a new definition of the family Characidae and a hypothesis of relationships for the Characiformes based on phylogenetic analysis of DNA sequences of two mitochondrial and three nuclear genes (4,680 base pairs. The sequences were obtained from 211 samples representing 166 genera distributed among all 18 recognized families in the order Characiformes, all 14 recognized subfamilies in the Characidae, plus 56 of the genera so far considered incertae sedis in the Characidae. The phylogeny obtained is robust, with most lineages significantly supported by posterior probabilities in Bayesian analysis, and high bootstrap values from maximum likelihood and parsimony analyses. Conclusion A monophyletic assemblage strongly supported in all our phylogenetic analysis is herein defined as the Characidae and includes the characiform species lacking a supraorbital bone and with a derived position of the emergence of the hyoid artery from the anterior ceratohyal. To recognize this and several other monophyletic groups within characiforms we propose changes in the limits of several families to facilitate future studies in the Characiformes and particularly the Characidae. This work presents a new phylogenetic framework for a speciose and morphologically diverse group of freshwater fishes of significant ecological and evolutionary importance across the Neotropics and portions of Africa.

  13. Merluccius hubbsi (Teleostei: Merlucciidae: stock identification based on reproductive biology in the south-southeast brazilian region

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    André Martins Vaz-dos-Santos

    2009-03-01

    Full Text Available The Argentine hake, Merluccius hubbsi, a demersal-pelagic species found from Rio de Janeiro, Brazil to the Tierra del Fuego, Argentina, has become an important target of the Brazilian bottom-trawler fleet since 2001. Earlier studies focusing on the species have suggested that more than one stock might occur off the Brazilian coast, in accordance with environmental features. In order to evaluate this hypothesis, fish were collected from four different areas in the Brazilian waters in which the hake is distributed, during the summers and winters of 1996-2001 and 2004, the females being used to analyze and compare spatial-temporal variations in ovarian maturation. Gonad indexes were also applied for the same purpose. Results indicate a north-south spawning gradient occurring as from summer at around 21°S to winter near 34°S, leading to the identification of two distinct stocks: one located between 21°S and 29°S (Southeastern stock and the other between 29°S and 34°S (Southern stock, this latter shared with Uruguay and Argentina. Brazilian stocks present clear signs of overexploitation, the situation calling for an urgent solution.A merluza Merluccius hubbsi, espécie demerso-pelágica distribuída desde o Rio de Janeiro, Brasil, até a Terra do Fogo, Argentina, tornou-se alvo das frotas de arrasto de fundo da região Sudeste-Sul do Brasil desde 2001. Estudos anteriores sobre a biologia da espécie sugeriram a existência de mais de um estoque em águas brasileiras, relacionados a características ambientais. Para verificar esta hipótese, exemplares oriundos de quatro áreas em águas brasileiras foram coletados durante o verão e o inverno nos períodos 1996-2001 e 2004, sendo as fêmeas utilizadas para analisar variações espaço-temporais na maturação gonadal. Para corroborar estas análises também foram aplicados índices gonadais. Os resultados mostraram a ocorrência de um gradiente norte-sul para a desova, que é mais intenso no verão em 21°S e no inverno em 34°S. Foram identificados dois estoques: um denominado Sudeste, que se distribui entre 21°S-29°S, e outro Sul, entre 29°S-34°S, este último compartilhado com o Uruguai e a Argentina. Os estoques brasileiros apresentam sinais de sobrepesca, situação que merece atenção e medidas apropriadas de gestão.

  14. Impact of chronic cadmium exposure at environmental dose on escape behaviour in sea bass (Dicentrarchus labrax L.; Teleostei, Moronidae)

    International Nuclear Information System (INIS)

    The effect of chronic exposure to a low concentration (0.5 μg l-1) of cadmium ions was investigated on escape behaviour of sea bass, Dicentrarchus labrax, using video analysis. Observations were also performed on the microanatomy of lateral system neuromasts. When fish were exposed for 4 h per day over 8 days to the cadmium ions, most of both types of neuromasts observed remained intact. However, some of them presented damaged sensory maculae. Whereas before cadmium exposure, fish responded positively to nearly all the lateral system stimulations, after exposure they decreased by about 10% their positive responses to stimulations. From the 15th day after the beginning of cadmium exposure, neuromasts presented progressively less damage, cadmium accumulation in gills and scales decreased significantly and fish escape behaviour had recovered. This study presents a new concept in ecotoxicology: using behavioural change to reveal the effects of pollution levels, scarcely detectable by currently used techniques (physiological responses). - Cadmium exposure involved a significant bioaccumulation in fish scales, slight damage to the lateral line system and a significant decrease in fish escape behaviour

  15. Systematic status of Systomus rubrotinctus Jerdon (Teleostei: Cyprinidae with notes on the Puntius arulius group of fishes

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    J.D.M. Knight

    2011-04-01

    Full Text Available Systomus rubrotinctus Jerdon has long been considered a synonym of Puntius arulius. Examination of ‘P. arulius’ collected from various parts of the Western Ghats revealed the presence of two distinct species: and the fish considered by Day as ‘P. arulius’ from Wayanad is in fact P. rubrotinctus. Based on the colour pattern, morphometrics and meristics, P. rubrotinctus is retrieved from the synonymy of P. arulius and redescribed. Puntius rubrotinctus can be distinguished from P. arulius by the unique colour pattern consisting of three well-defined black blotches on the body, two scales high and three scales wide, as distinct from the diffused blotches in P. arulius. It further differs from P. arulius in having a shorter dorsal-to-hypural distance (49.8-54.6 % SL, vs. 57.3-57.6 % SL, a smaller interorbital width (28.4-35.6 % HL, vs. 39.1-39.7 % HL and a higher number of gill rakers (10-11 in the first gill arch, vs. 8. Puntius rubrotinctus is wide distributed in the Cauvery River and its tributaries in the Western Ghats region across the states of Kerala, Karnataka and Tamil Nadu. The results revalidate the identity of the ‘Puntius filamentosus group’ of previous authors drawing attention to the presence of intermediate forms among this group, in which natural hybrids appear to occur, of which P. exclamatio may be one.

  16. Henneguya cynoscioni sp. n. (Myxosporea: Bivalvulida), an agent of severe cardiac lesions in the spotted seatrout, Cynoscion nebulosus (Teleostei: Sciaenidae)

    Czech Academy of Sciences Publication Activity Database

    Dyková, Iva; de Buron, I.; Roumillat, W. A.; Fiala, Ivan

    2011-01-01

    Roč. 58, č. 3 (2011), 169–177. ISSN 0015-5683 R&D Projects: GA MŠk LC522 Institutional research plan: CEZ:AV0Z60220518 Keywords : Henneguya cynoscioni * Myxosporea * pathogenicity * cardiac henneguyosis * Cynoscion nebulosus * Cardicola laruei * Atlantic Ocean Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 1.812, year: 2011 http://www.paru.cas.cz/folia/pdfs/showpdf.php?pdf=21985

  17. Convergence of specialised behaviour, eye movements and visual optics in the sandlance (Teleostei) and the chameleon (Reptilia)

    Science.gov (United States)

    Pettigrew, J D; Collin, S P; Ott, M

    1999-04-22

    Chameleons have a number of unusual, highly specialised visual features, including telescopic visual optics with a reduced lens power, wide separation of the eye's nodal point from the axis of rotation, a deep-pit fovea, rapid pre-calculated strikes for prey based on monocular depth judgements (including focus), and a complex pattern of partially independent alternating eye movements. The same set of features has been acquired independently by a teleost, the sandlance Limnichthyes fasciatus. Despite its underwater lifestyle, this fish displays visual behaviour and rapid strikes for prey that are remarkably similar to those of the chameleon [1]. In a direct comparison of the two species, we have revealed other, previously unsuspected, similarities, such as corneal accommodation, which was unknown in teleosts, as well as bringing together, for the first time, data collected from both species. The sandlance is the only teleost, among thousands studied, that has corneal refraction, corneal accommodation and reduced lens power, as well as sharing the other specialised optical features seen in chameleons. The independent eye movement pattern in the sandlance is also unusual and similar to that of the chameleon. The selection pressures that have produced this remarkable example of convergence may relate to common visual constraints in the life styles of these two phylogenetically disparate species. PMID:10226026

  18. Sardinella brasiliensis (Steindachner, 1879) (Teleostei: Clupeidae), nome válido aplicado à sardinha-verdadeira no sudeste do Brasil

    OpenAIRE

    José Lima de Figueiredo; Ana Carolina Ribeiro Salles; Leandro Bonesi Rabelo

    2010-01-01

    A história nomenclatural de Sardinella brasiliensis (Steindachner, 1879) e de seu nome de substituição, Sardinella janeiro (Eigenmann, 1894) é apresentada, sendo confirmada a validade do primeiro por meio da aplicação dos dispositivos do Código Internacional de Nomenclatura Zoológica.The nomenclatural history of Sardinella brasiliensis (Steindachner, 1879) and its replacement name Sardinella janeiro (Eigenmann, 1894) is presented, and the validity of the first confirmed through the applicatio...

  19. Can spawning marks on females of the spined loach (Cobitis sp., Teleostei) be caused by scratches from males during mating?

    Czech Academy of Sciences Publication Activity Database

    Halačka, Karel; Vetešník, Lukáš; Mendel, Jan; Papoušek, Ivo

    2010-01-01

    Roč. 59, č. 4 (2010), s. 329-331. ISSN 0139-7893 R&D Projects: GA MŽP SP/2D4/55/07 Grant ostatní: GA AV ČR(CZ) M200930901 Institutional research plan: CEZ:AV0Z60930519 Keywords : Cobitis elongatoides * epidermis * spawning Subject RIV: EG - Zoology Impact factor: 0.548, year: 2010

  20. Genetic structure and distribution of Oxynoemacheilus bureschi (Teleostei:Balitoridae), and its phylogenetic relationship with other European stone loaches

    Czech Academy of Sciences Publication Activity Database

    Šedivá, Alena; Apostolou, A.; Janko, Karel; Kohout, Jan; Kostov, V.; Šanda, R.

    2008-01-01

    Roč. 57, 1-2 (2008), s. 111-119. ISSN 0139-7893. [International Conference Loaches of the genus Cobitis and related genera. Šibenik, 24.09.2006-29.09.2006] R&D Projects: GA AV ČR(CZ) KJB600450601; GA ČR GP206/05/P586; GA MŠk LC06073 Institutional research plan: CEZ:AV0Z50450515 Keywords : range expansion * Pleistocene * mitochondrial DNA Subject RIV: EG - Zoology Impact factor: 0.522, year: 2008

  1. Differentiation and growth of myotomal muscles in a non-model tropical fish Pterophyllum scalare (Teleostei: Cichlidae).

    Science.gov (United States)

    Kacperczyk, A; Jędrzejowska, I; Daczewska, M

    2011-12-01

    Somite differentiation, muscle fibres formation and growth were analysed in a non-model tropical fish Pterophyllum scalare. In this study, it was found that during somite differentiation, a primary myotome appears. The primary myotome is filled with multinucleated myotubes that constitute the major part of the somite. Subsequently, Pax-3 (paired-box protein)-positive cells, located externally to the myotomes, appear. In post-hatching stages, mononucleated proliferating cell nuclear antigen-positive cells are observed in the inter-myotomal spaces and within the myotomes. The mononucleated cells, situated in the myotomes, first express desmin in their cytoplasm and then Pax-7 (paired-box protein) in their nuclei. Expression of desmin indicates that they will enter myogenic pathway, whereas expression of Pax-7 suggests their role of satellite cells. We assume that mononucleated intramyotomal cells are myogenic precursors involved in muscle growth. In advanced (post-hatching) stages of myogenesis, myotomes contain both primary and new muscle fibres. Morphometric analyses show that in Pterophyllum scalare, growth of muscle fibres is mainly a result of hypertrophy. PMID:21569078

  2. A systematic review of diapoma (teleostei: characiformes: characidae: stevardiinae: diapomini with descriptions of two new species from southern Brazil

    Directory of Open Access Journals (Sweden)

    Naércio A. Menezes

    2011-01-01

    Full Text Available Diapoma is reviewed and four species are recognized: (1 Diapoma thauma, new species, from streams of the rio Jacuí basin, state of Rio Grande do Sul; (2 D. pyrrhopteryx, new species collected from the rio Canoas and streams flowing into this basin in the states of Rio Grande do Sul and Santa Catarina, Brazil; (3 Diapoma terofali, from streams flowing into rio Uruguay in Uruguay and Rio Grande do Sul, Brazil and streams flowing into rio de la Plata, Argentina; and (4 Diapoma speculiferum, from lowland coastal streams in Rio Grande do Sul, Brazil and Uruguay. Diapoma pyrrhopteryx possess the posteroventral opercular elongation typical of D. speculiferum, type species of the genus, but which is absent in D. thauma and D. terofali. Nonetheless, all the diapomin species have the caudal pouch organ about equally developed in both sexes and the dorsal portion of the pouch opening bordered by a series of 3 to 8 elongated scales, the two derived features that characterize the group. The two previously described species, D. speculiferum and D. terofali, are redescribed. Previous hypotheses of relationships among the diapomin genera Planaltina, Diapoma and Acrobrycon are discussed on the basis of preliminary morphological information. It is proposed that the Diapomini is a monophyletic group. An identification key, information on sexual dimorphism, gonad anatomy, reproductive mode and distribution of the species of Diapoma are provided.

  3. Ontogenetic shape changes in Pomacentridae (Teleostei, Perciformes) and their relationships with feeding strategies: a geometric morphometric approach

    OpenAIRE

    Frederich, Bruno; Adriaens, Dominique; Vandewalle, Pierre

    2008-01-01

    The present study explores the shape changes of cranial structures directly involved in food capturing during growth after reef settlement in two species of Pomacentridae (Dascyllus aruanus and Pomacentrus pavo). Landmark-based geometric morphometrics were used to study allometric patterns and related shape changes in four skeletal units: neurocranium, suspensorium and opercle, mandible and premaxilla. At settlement, the larvae of both species have a relatively similar morphology, especially ...

  4. Evolutionary patterns of shape and functional diversification in the skull and jaw musculature of triggerfishes (Teleostei: Balistidae).

    Science.gov (United States)

    McCord, Charlene L; Westneat, Mark W

    2016-06-01

    The robust skull and highly subdivided adductor mandibulae muscles of triggerfishes provide an excellent system within which to analyze the evolutionary processes underlying phenotypic diversification. We surveyed the anatomical diversity of balistid jaws using Procrustes-based geometric morphometric analyses and a phylomorphospace approach to quantifying morphological transformation through evolution. We hypothesized that metrics of interspecific cranial shape would reveal patterns of phylogenetic diversification that are congruent with functional and ecological transformation. Morphological landmarks outlining skull and adductor mandibulae muscle shape were collected from 27 triggerfish species. Procrustes-transformed skull shape configurations revealed significant phylogenetic and size-influenced structure. Phylomorphospace plots of cranial shape diversity reveal groupings of shape between different species of triggerfish that are mostly consistent with phylogenetic relatedness. Repeated instances of convergence upon similar cranial shape by genetically disparate taxa are likely due to the functional demands of shared specialized dietary habits. This study shows that the diversification of triggerfish skulls occurs via modifications of cranial silhouette and the positioning of subdivided jaw adductor muscles. Using the morphometric data collected here as input to a biomechanical model of triggerfish jaw function, we find that subdivided jaw adductors, in conjunction with a unique cranial skeleton, have direct biomechanical consequences that are not always congruent with phylomorphospace patterns in the triggerfish lineage. The integration of geometric morphometrics with biomechanical modeling in a phylogenetic context provides novel insight into the evolutionary patterns and ecological role of muscle subdivisions in triggerfishes. J. Morphol. 277:737-752, 2016. © 2016 Wiley Periodicals, Inc. PMID:26997352

  5. Morphometric variation of the Herichthys bartoni (Bean, 1892 species group (Teleostei: Cichlidae: How many species comprise H. labridens (Pellegrin, 1903?

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    Omar Mejía

    2015-03-01

    Full Text Available Cichlids of the tribe Heroini have long been a source of taxonomical conflict. In particular, the species included in the Herichthys bartoni group have failed to be recovered as monophyletic in different molecular studies. In this paper we use traditional and geometric morphometrics to evaluate morphological variation in the species included in the H. bartoni complex in order to evaluate the number of species it contains. An update of a previously published DNA barcoding study suggests the existence of three genetic clusters that included the six recognized species analyzed in this study, none of them recovered as monophyletic. On the other hand, geometric morphometrics arise as a useful tool to discriminate species due that traditional morphometrics showed a high overlap in the characters analyzed that prevents the proposal of diagnostic characters.

  6. Populations of Odontesthes (Teleostei: Atheriniformes) in the Andean region of Southern South America: body shape and hybrid individuals

    OpenAIRE

    Cecilia Conte-Grand; Julie Sommer; Guillermo Ortí; Víctor Cussac

    2015-01-01

    The original distribution area of the Patagonian 'pejerrey' Odontesthes hatcheri has been subjected to the introduction of a related species; the Bonaerensean 'pejerrey' Odontesthes bonariensis. This species currently coexists with O. hatcheri in lakes and reservoirs, and can interbreed and produce fertile hybrid offspring. The purposes of this study were; a) the extensive sampling of Patagonian and Andean-Cuyan populations of pejerrey, b) the species identification according to taxonomic key...

  7. Populations of Odontesthes (Teleostei: Atheriniformes in the Andean region of Southern South America: body shape and hybrid individuals

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    Cecilia Conte-Grand

    2015-03-01

    Full Text Available The original distribution area of the Patagonian 'pejerrey' Odontesthes hatcheri has been subjected to the introduction of a related species; the Bonaerensean 'pejerrey' Odontesthes bonariensis. This species currently coexists with O. hatcheri in lakes and reservoirs, and can interbreed and produce fertile hybrid offspring. The purposes of this study were; a the extensive sampling of Patagonian and Andean-Cuyan populations of pejerrey, b the species identification according to taxonomic key, c validation of taxonomic results on the basis of mitochondrial DNA composition, and d applying morphometric analysis to explore the effects of hybridization and environmental conditions on body shape. Cytochrome b sequence analysis showed a high degree of genetic divergence between species and low intraspecific variation in O. hatcheri. Geometric Morphometric Analyses detected shape differences in agreement with diagnostic characteristics of each species. Putative hybrids exhibiting intermediate diagnostic characteristics were identified by Geometric Morphometric Analysis. Significant regressions between body shape and total phosphorus and altitude were found, suggesting a dependence on trophic web structure. This multi-level approach suggests the introgression of O. bonariensis into several O. hatcheri populations throughout Patagonia. Managers should take this into account when considering further exotic introductions into regions where non-native fishes have not yet become established.

  8. Genomic structure of c-Ki-ras proto-oncogene of the hermaphroditic fish Rivulus marmoratus (teleostei: Rivulidae).

    Science.gov (United States)

    Lee, J S; Choe, J; Park, E H

    1995-01-01

    The ras homologue of the rivulid fish Rivulus marmoratus was isolated and characterized by screening about 3.0 x 10(5) genomic clones from a Rivulus genomic library using human c-Ha-ras probe. When this clone was partially sequenced focusing on the region coding exons, it showed 97.5% amino acid homology to the human c-Ki-ras gene. The Rivulus c-Ki-ras gene spans about 6.3 kb and consists of five exons including the alternative splicing exon 4a/4b. The exon-intron boundaries of Rivulus c-Ki-ras gene coincided with the GT/AG rule of consensus splice acceptor and donor sequences as in mammalian c-Ki-ras genes. Amino acid sequence analysis of some domain regions of the Rivulus c-Ki-ras gene revealed 100% identity to mammalian c-Ki-ras gene. This report is the first that elucidate the entire structure of c-Ki-ras in a fish. PMID:7735140

  9. †Kenyaichthyidae fam. nov. and †Kenyaichthys gen. nov. - First Record of a Fossil Aplocheiloid Killifish (Teleostei, Cyprinodontiformes).

    Science.gov (United States)

    Altner, Melanie; Reichenbacher, Bettina

    2015-01-01

    The extant Cyprinodontiformes (killifishes) with their two suborders Cyprinodontoidei and Aplocheiloidei represent a diverse and well-studied group of fishes. However, their fossil record is comparatively sparse and has so far yielded members of the Cyprinodontoidei only. Here we report on cyprinodontiform fossils from the upper Miocene Lukeino Formation in the Tugen Hills of the Central Rift Valley of Kenya, which represent the first fossil record of an aplocheiloid killifish. A total of 169 specimens - mostly extraordinarily well preserved - and a sample of ten extant cyprinodontiform species were studied on the basis of morphometrics, meristics and osteology. A phylogenetic analysis using PAUP was also conducted for the fossils. Both the osteological data and the phylogenetic analysis provide strong evidence for the assignment of the fossils to the Aplocheiloidei, and justify the definition of the new family †Kenyaichthyidae, the new genus †Kenyaichthys and the new species †K. kipkechi sp. nov. The phylogenetic analysis unexpectedly places †Kenyaichthys gen. nov. in a sister relationship to the Rivulidae (a purely Neotropical group), a probable explanation might be lack of available synapomorphies for the Rivulidae, Nothobranchiidae and Aplocheilidae. The specimens of †K. kipkechi sp. nov. show several polymorphic characters and large overlap in meristic traits, which justifies their interpretation as a species flock in statu nascendi. Patterns of variation in neural and haemal spine dimensions in the caudal vertebrae of †Kenyaichthys gen. nov. and the extant species studied indicate that some previously suggested synapomorphies of the Cyprinodontoidei and Aplocheiloidei need to be revised. PMID:25923654

  10. Phylogeny and biogeography of 91 species of heroine cichlids (Teleostei: Cichlidae) based on sequences of the cytochrome b gene.

    Science.gov (United States)

    Pérez, Gustavo A Concheiro; Rícan, Oldrich; Ortí, Guillermo; Bermingham, Eldredge; Doadrio, Ignacio; Zardoya, Rafael

    2007-04-01

    Heroini constitute the second largest tribe of Neotropical cichlids and show their greatest diversity in Mesoamerica. Although heroine species are morphologically and ecologically very diverse, they were all historically assigned to one single genus, Cichlasoma that was never formally revised from a phylogenetic point of view. Here, we present the most comprehensive molecular phylogeny of the tribe Heroini to date, based on the complete DNA sequence of the mitochondrial gene cytochrome b, and the analysis of 204 individuals representing 91 species. Phylogenetic analyses did not support the monophyly of heroines because the genus Pterophyllum was placed as the sister group of all remaining heroines plus cichlasomatines. However, the recovered relative position of Pterophyllum was without strong statistical support. Within the remaining heroines, Hyspelecara and Hoplarchus are recovered with low support in a basal position with respect to a clade that includes Heros, Uaru, Mesonauta, and Symphysodon, and the circumamazonian (CAM) heroines. The first clade is restricted to South America. The largest clade of heroines, the CAM heroines, include more than 85% of the species within the tribe. This clade is mostly Mesoamerican, but also contains four species found in the Greater Antilles (Nandopsis), and three genera found in South America (the 'Heros' festae group, Australoheros, and Caquetaia). Up to eight major lineages can be recovered within the CAM heroines, but the phylogenetic relationships among them remain unresolved. Two large suprageneric groups can be distinguished, the amphilophines and the herichthyines. The amphilophines include Amphilophus, Archocentrus, Hypsophrys, Neetroplus, Parachromis, Petenia, and five additional unnamed genera (the 'Heros' istlanus group, the 'Amphilophus' calobrensis group, the 'Heros' urophthalmus group, the 'Heros' wesseli group, and the 'Heros' sieboldii group). The herichthyines include the crown-group herichthyines (Herichthys, Theraps, Vieja, and Paratheraps) and the genera Tomocichla, Herotilapia, and Thorichthys, together with three unnamed genera (the 'Heros' umbriferus group, the 'Heros' grammodes group, and the 'Heros' salvini group). Amphilophines are prevalent in southern Mesomerica south of the Motagua fault. Herichthyines have basal linages in Central America, whereas crown-group herichthyines and three related genera are found north from the Motagua fault. At least two independent origins are required to explain current Mesoamerican heroine distribution. Dispersal of heroines from South America into Mesoamerica was dated between 24 and 16 million years ago (MYA) based on geological calibrations and on standard fish mitochondrial cytochrome b rates, respectively. These datings cannot be reconciled with currently known geological evidence, and the existence of a connection between Central America and South America in the Miocene needs to be postulated in order to explain the origins of Mesoamerican heroine lineages. However, our datings agree with those estimated for the dispersal of other secondary freshwater fishes (Rivulidae, Synbranchus) into Mesoamerica, and predate the invasion of primary freshwater fishes by at least 10 myr. PMID:17045493

  11. Dynamics of Rex3 in the genomes of endangered Iberian Leuciscinae (Teleostei, Cyprinidae) and their natural hybrids

    Czech Academy of Sciences Publication Activity Database

    Pereira, C. S.; Pazian, M. F.; Ráb, Petr; Collares-Pereira, M. J.

    2015-01-01

    Roč. 8, č. 81 (2015). ISSN 1755-8166 Institutional support: RVO:67985904 Keywords : Anaecypris hispanica * Chondrostoma s.l. sp * Karyotype differentiation Subject RIV: EB - Genetics ; Molecular Biology Impact factor: 2.140, year: 2014

  12. A new vision of the origin and the oocyte development in the Ostariophysi applied to Gymnotus sylvius (Teleostei: Gymnotiformes

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    Gisleine Fernanda França

    2010-01-01

    Full Text Available Based on new knowledge coming from marine perciform species, the origin of oocytes and their development in the Ostariophysi, Gymnotus sylvius is described. In both Gymnotus sylvius and marine perciform fish, oogonia are found in the germinal epithelium that forms the surface of the ovarian lamellae. At the commencement of folliculogenesis, proliferation of oogonia and their entrance into meiosis gives rise to germ cell nests that extend into the stroma from the germinal epithelium. Both cell nests and the germinal epithelium are supported by the same basement membrane that separates them from the stroma. At the time of meiotic arrest, oocytes in a cell nest become separated one from the other as processes of prefollicle cells, these being derived from epithelial cells in the germinal epithelium, gradually encompass and individualize them while also synthesizing a basement membrane around themselves during folliculogenesis. The oocyte enters primary growth while still within the cell nest. At the completion of folliculogenesis, the oocyte and follicle cells, composing the follicle, are encompassed by a basement membrane. The follicle remains connected to the germinal epithelium as the both share a portion of common basement membrane. Cells originating from the stroma encompass the ovarian follicle, except where there is a shared basement membrane, to form the theca. The follicle, basement membrane and theca form the follicular complex. Oocyte development occurs inside the follicular complex. Development is divided into the stages primary and secondary growth, oocyte maturation and ovulation. Cortical alveoli appear in the ooplasm just prior to the beginning of secondary growth, the vitellogenic stage that begins with yolk deposition and proceeds until the oocyte is full-grown and the ooplasm is filled with yolk globules. Maturation is characterized by the germinal vesicle or nuclear migration, germinal vesicle breakdown or nuclear envelop fragmentation and the resumption of meiosis. At the ovulation the egg is released from the follicular complex into the ovarian lumen. When compared to marine Perciformes that lay pelagic eggs, oocyte development in Gymnotus sylvius has fewer steps within the stages of development, the two most remarkable being the absence of oil droplet formation during primary and secondary growth, (and the consequent absence of the oil droplets fusion during maturation, and the hydrolysis of yolf preceding ovulation.Tendo por base os novos conhecimentos oriundos de recentes estudos com Perciformes marinho, a origem e o desenvolvimento dos oócitos no Ostariophysi Gymnotus sylvius são aqui descritos. Da mesma maneira que ocorre nos Perciformes, em Gymnotus sylvius as oogônias são encontradas no epitélio germinativo que margeia as lamelas ovígeras. No início da foliculogênese, a proliferação das oogônias e sua entrada em meiose dão origem a ninhos de células germinativas que se projetam em direção ao estroma ovariano, a partir do epitélio germinativo. Os ninhos e o epitélio germinativo são suportados pela mesma membrana basal que os separa do estroma. Coincidindo com a paralisação da meiose os oócitos, presentes nos ninhos, são separados uns dos outros por processos citoplasmáticos das células pré-foliculares. As células pré-foliculares derivam do epitélio germinativo sendo, portanto, inicialmente células epiteliais. Durante a foliculogênese, ao mesmo tempo em que envolvem os oócitos individualizando-os, as células pré-foliculares sintetizam a membrana basal ao seu redor. Os oócitos entram em crescimento primário ainda dentro dos ninhos. Ao término da foliculogênese, o oócito e as células foliculares que compõem o folículo são circundados pela membrana basal. O folículo permanece conectado ao epitélio germinativo uma vez que ambos compartilham uma porção comum da membrana basal. Células oriundas do estroma circundam o folículo ovariano exceto na região de compartilhamento da membrana basal formando a teca. O folículo, a membrana basal e a teca formam o complexo folicular. O desenvolvimento do oócito ocorre dentro do complexo folicular e compreende os estágios de crescimento primário e secundário, maturação e ovulação. Os alvéolos corticais surgem no ooplasma momentos antes do início do crescimento secundário ou estágio vitelogênico que tem início com a deposição de vitelo, progride até o oócito esteja completamente desenvolvido e o ooplasma preenchido pelos glóbulos de vitelo. A maturação é caracterizada pela migração do núcleo ou vesícula germinativa, pela quebra da vesícula germinativa, ou seja, pela fragmentação do envoltório nuclear e, retomada da meiose. Na ovulação o ovo é liberado do complexo folicular para o lúmen ovariano. Em comparação com os Perciformes marinhos com ovos pelágicos, o desenvolvimento oocitário em Gymnotus sylvius tem menos etapas dentro dos estágios de desenvolvimento, sendo as duas mais notáveis delas as ausências da formação das gotas de lipídio durante os crescimentos primário e secundário (e a consequente fusão das gotas para formar um único glóbulo de lipídio durante a maturação e, a hidrólise do vitelo antecedendo a ovulação.

  13. ZZ/ZW sex chromosome system in the endangered fish Lignobrycon myersi Miranda-Ribeiro, 1956 (Teleostei, Characiformes, Triportheidae)

    Science.gov (United States)

    Rodrigues, Alexandre dos Santos; Medrado, Aline Souza; Diniz, Débora; Oliveira, Claudio; Affonso, Paulo Roberto Antunes de Mello

    2016-01-01

    Abstract Lignobrycon myersi is an endemic fish species from a few coastal rivers in northeastern Brazil. Based on molecular evidence, Lignobrycon myersi and genera Triportheus Cope, 1872, Agoniates Müller & Troschel, 1845, Clupeacharax Pearson, 1924 and Engraulisoma Castro, 1981 were placed in the family Triportheidae. In the present work, we report the first cytogenetic data for Lignobrycon myersi to test the hypothesis that Lignobrycon and Triportheus are closely related. Studied specimens presented 2n=52 with 28 metacentric (m), 18 submetacentric (sm) and six subtelocentric (st) chromosomes for males and 27 m, 19 sm and 6 st for females, characterizing a ZZ/ZW sex chromosome system. The Z chromosome corresponds to the largest chromosome in karyotype while the W is about 50% smaller than the Z and largely heterochromatic. Terminal nucleolus organizer regions, GC-rich sites and 18S rDNA signals were detected on pair 14. However, additional 18S rDNA sites were observed in the W chromosome. The 5S rDNA was mainly detected on long arms of pair 7. The apparent synapomorphic chromosomal traits of Triportheus and Lignobrycon myersi reinforce their close phylogenetic relationship, suggesting that the ZZ/ZW chromosome system in both genera has arisen before cladogenic events. PMID:27551346

  14. Karyotype and genome size of Iberochondrostoma almacai (Teleostei, Cyprinidae) and comparison with the sister-species I. lusitanicum

    OpenAIRE

    Rita Monteiro; Cláudia Carvalho; Maria João Collares-Pereira

    2009-01-01

    This study aimed to define the karyotype of the recently described Iberian endemic Iberochondrostoma almacai, to revisit the previously documented chromosome polymorphisms of its sister species I. lusitanicum using C-, Ag-/CMA3 and RE-banding, and to compare the two species genome sizes. A 2n = 50 karyotype (with the exception of a triploid I. lusitanicum specimen) and a corresponding haploid chromosome formula of 7M:15SM:3A (FN = 94) were found. Multiple NORs were observed in both species (i...

  15. Ellipsomyxa gobii (Myxozoa: Ceratomyxidae) in the common goby Pomatoschistus microps (Teleostei: Gobiidae) uses Nereis spp. (Annelida: Polychaeta) as invertebrate hosts.

    Science.gov (United States)

    Køie, Marianne; Whipps, Christopher M; Kent, Michael L

    2004-03-01

    Nereis diversicolor O.F. Müller and N. succinea Frey et Leuckart (Polychaeta, Nereidae) living in brackish shallow areas in Denmark are naturally infected with tetractinomyxon actinospores. Infected Nereis spp. were experimentally fed to various potential fish hosts, and the actinosporean stages developed into myxosporean stages of Ellipsomyxa gobii Køie, 2003 (Ceratomyxidae) in the gallbladder of the common goby Pomatoschistus microps (Krøyer) (Gobiidae). The European eel Anguilla anguilla (L.), three-spined stickleback Gasterosteus aculeatus L., small sand eel Ammodytes tobianus L., flounder Platichthys flesus (L.), European plaice Pleuronectes platessa L. and common sole Solea solea (L.) did not become experimentally infected. In Danish shallow brackish areas P. microps is naturally infected with E. gobii, in some areas with a prevalence >90%. We compared small subunit ribosomal DNA sequences of the actinosporean with E. gobii from P. microps. Sequences were identical, which further verifies that both forms belong to the same organism. This is the first myxozoan two-host life cycle in the marine environment. PMID:15139372

  16. Notes on the genus Amphiprion Bloch & Schneider, 1801 (Teleostei: Pomacentridae) and its host sea anemones in the Seychelles

    OpenAIRE

    Hartog, den, J.M.P.

    1997-01-01

    The genus Amphiprion Bloch & Schneider, 1801, is represented in the Seychelles by two species, A. akallopisos Bleeker, 1853, and the endemic A. fuscocaudatus Allen, 1972. Throughout its distributional range Amphiprion akallopisos has exclusively been recorded to associate with the clownfish anemones Heteractis magnifica (Quoy & Gaimard, 1833) and Stichodactyla mertensii Brandt, 1835. During the Netherlands Indian Ocean Programme (NIOP) Seychelles Expedition 19921993 this was confirmed for the...

  17. Sexual development and reproductive pattern of the Mutton hamlet, Alphestes afer (Teleostei: Epinephelidae: a dyandric, hermaphroditic reef fish

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    Simone Marques

    2011-01-01

    Full Text Available There is little knowledge on the reproduction of the genus Alphestes. The reproduction of the Mutton hamlet, Alphestes afer, sampled in Pernambuco reefs (Brazil was studied based on macroscopic analysis during reproductive period and histological analysis of gonad material from March 2008 to October 2009. This study showed that A. afer is a diandric, protogynous hermaphrodite. Sex change followed protogynous mode in two pathways: primary males formed from immature female individuals or secondary males formed from resting, ripe or spent female individuals. The numerical distribution of gonad classes by size indicated that females from 11-18 cm L T were immature while females from 16-25 cm L T and males from 12-22 cm L T were in various stages of gonadal development. Individuals identified as immature bisexual and transitional (presenting both ovarian and sperm tissue were sized from 16-24 cm L T. Size of first reproduction for females was 18 cm L T and for males was 12 cm L T. Alphestes afer showed multiple spawning, with spawning season period from August to December 2008 and from August to October 2009. The sex-ratio (females: males in 2008 and 2009 was 0.94:1 during the months of spawning season. Males were smaller than females, reaching maximum size of 22 cm compared to 25 cm observed for females. Males showed a high sperm competition rank (3.8, suggesting intense sperm competition. This latter is a possible indication of a shift in the mating group structure from paired to group spawning. The presence of small males added to high sperm competition index, suggest that this species, while retaining the protogynous pattern, has a reproductive strategy similar to gonochorist epinephelids.Há pouco conhecimento sobre a reprodução do gênero Alphestes. A reprodução do sapé Alphestes afer coletado nos recifes de Pernambuco (Brasil foi estudada baseada em análises macroscópicas durante o período reprodutivo e análises histológicas das gônadas de março de 2008 a outubro de 2009. Esse estudo mostrou que Alphestes afer é uma espécie hermafrodita diândrica. A mudança de sexo seguiu o modo protogínico em dois caminhos: machos primários transformados de fêmeas imaturas ou machos secundários transformados de fêmeas em repouso, maduras ou esgotados. A distribuição numérica por classe de tamanho indicou que fêmeas de 11-18 cm L T foram imaturas; fêmeas de 16-25 cm L T e machos de 12-22 cm L T foram de vários estádios de desenvolvimento gonadal. Indivíduos identificados como imaturos bissexuais e transicionais (ambos apresentando tecido ovariano e espermático foram de 16-24 cm L T de comprimento. O tamanho de primeira maturação da fêmea foi 18 cm L T e do macho foi 12 cm L T. Alphestes afer mostrou desova múltipla, com período de desova de agosto a dezembro de 2008 e de agosto a outubro de 2009. A proporção sexual (fêmeas: machos em 2008 e 2009 foi 0,94:1 durante os meses de desova. Machos foram menores que as fêmeas, alcançando o tamanho máximo de 22 cm L T comparados ao tamanho máximo de 25 cm L T das fêmeas observadas. Machos tiveram o rank de competição espermática alto (3,8 sugerindo intensa competição espermática, o que é uma possível indicação da mudança na estrutura do grupo de acasalamento de desova em pares para desova em grupo. A presença de machos pequenos com alto índice de competição espermática sugere que esta espécie, enquanto retém o padrão protogínico, possui uma estratégia reprodutiva similar aos epinefelídeos gonocoristas.

  18. Karyotypic characterization of Prochilodus mariae, Semaprochilodus kneri and S. laticeps(Teleostei: Prochilodontidae) from Caicara del Orinoco, Venezuela

    OpenAIRE

    Claudio Oliveira; Mauro Nirchio; Ángel Granado; Sara Levy

    2003-01-01

    Fish of the family Prochilodontidae are considered one of the most important components of commercial and subsistence fishery in freshwater environments in South America. This family consists of 21 species and three genera. In the present study, the karyotypes of Prochilodus mariae, Semaprochilodus kneri, and S. laticeps from Caicara del Orinoco, Bolivar State, Venezuela were studied. The species P. mariae, S. kneri and S. laticeps exhibited 2n=54 chromosomes (40 metacentric and 14 submetacen...

  19. Development of the splanchnocranium in Prochilodus argenteus (Teleostei: Characiformes) with a discussion of the basal developmental patterns in the Otophysi.

    Science.gov (United States)

    Carvalho, Murilo; Vari, Richard P

    2015-02-01

    Development of the mandibular, hyoid and gill arches, which constitute the splanchnocranium, are described for Prochilodus argenteus, order Characiformes, one of the basal lineages of the Otophysi. Development was examined from just hatched larvae through juveniles using whole specimens cleared and counterstained for cartilage and bone as well as histological preparations. Observations are compared with the developmental trends reported for Cypriniformes, the basalmost clade of the Otophysi. Shortened developmental sequences for Prochilodus compared to the cypriniform Catostomus were discovered in the ontogeny of the ceratohyals, ceratobranchials 1-5, epibranchials 1-4 and the symplectic portion of the hyosymplectic. Prochilodus also differs from Catostomus in having the basihyal plus the anterior copula appearing at different stages of ontogeny rather than simultaneously. Contrary to previous assumptions, developmental information indicates that hypobranchial 4 as well as likely basibranchial 5 are present in Prochilodus. Various developmental patterns in Prochilodus considered basal for the Otophysi, the predominant component of the Ostariophysi, are likely conserved from patterns prevalent in basal groups in the Actinopterygii. PMID:25595854

  20. Monophyly and phylogenetic relationships of the catfish genus Glyptothorax (Teleostei: Sisoridae) inferred from nuclear and mitochondrial gene sequences.

    Science.gov (United States)

    Jiang, Wansheng; Ng, Heok Hee; Yang, Junxing; Chen, Xiaoyong

    2011-11-01

    Glyptothorax Blyth (1860) is the most species-diverse and widely-distributed genus in the Sisoridae, but few studies have examined monophyly of the genus and phylogenetic relations within it. We used the nuclear RAG2 gene and mitochondrial COI and Cyt b genes from 50 of the approximately 70 species to examine monophyly of Glyptothorax and phylogenetic relationships within the genus. Molecular phylogenetic trees were constructed using maximum parsimony, maximum likelihood and Bayesian inference methods. All methods strongly supported monophyly of Glyptothorax, with Bagarius as its sister group. Both analyses of two- and three-gene datasets recovered nine major subclades of Glyptothorax, but some internal nodes remained poorly resolved. The phylogenetic relationships within the genus and existing taxonomic problems are discussed. PMID:21820519

  1. Kudoa unicapsula n. sp. (Myxosporea: Kudoidae) a parasite of the Mediterranean mullets Liza ramada and L. aurata (Teleostei: Mugilidae).

    Science.gov (United States)

    Yurakhno, V M; Ovcharenko, M O; Holzer, A S; Sarabeev, V L; Balbuena, J A

    2007-11-01

    A new multivalvulid myxozoan parasite, Kudoa unicapsula n. sp., is described from the intestinal mesentery, intestine and pyloric caeca of the thin-lipped grey mullet Liza ramada (Risso 1826) and the golden grey mullet L. aurata (Risso, 1810) from the Mediterranean coastal waters of Spain. It is characterized by the presence of elongated, rice corn-like white cysts of 0.47-0.56 x 0.18-0.38 mm, filled with tetracapsulate, slightly asymmetric spores, rectangular in apical view and tear-shaped in lateral view with four polar capsules of considerably different size and slightly unequal spore valves with rounded edges, overlapping each other on the apex of the spore. One large polar capsule includes a polar filament coiled in two to three turns, and the other three polar capsules, which are very small, posses only a rudimental filament. Both light and electron microscopy data showed that this species differs from all previously described Kudoa spp. with unequal polar capsules. The molecular analysis based on 18S and 28S ribosomal deoxyribonucleic acid DNA sequence data of K. unicapsula n. sp. indicates a close relationship and thus phylogenetic clustering together with K. trifolia, a myxozoan from the same host and the same geographical location. PMID:17846792

  2. Comparative cytogenetics of two endangered leuciscine fish, Squalius aradensis and S. torgalensis (Teleostei, Cyprinidae, from the Iberian Peninsula

    Directory of Open Access Journals (Sweden)

    Catarina Nabais

    2013-03-01

    Full Text Available In this study, the description of the karyotypes of the endangered chubs Squalius aradensis (Coelho, Bogutskaya, Rodrigues and Collares-Pereira, 1998 and Squalius torgalensis (Coelho, Bogutskaya, Rodrigues and Collares-Pereira, 1998 is presented by means of conventional (Giemsa-staining, Chromomycin A3 (CMA3-fluorescence, Silver-impregnation (Ag-NORs and molecular (fluorescence in situ hybridization (FISH with 18S rDNA probe protocols. These endemic sister-species have an allopatric but adjacent distribution in the most southwestern part of the Iberian Peninsula. Diploid chromosome number was invariably 2n = 50 and karyotypes of both species were grossly similar, composed of metacentric and submetacentric elements with a reduced number of acrocentric pairs. Sequential staining using FISH with an 18S rDNA probe, CMA3 and Ag-NORs treatments revealed consistent positive signals located at the end of the short arms of a submetacentric chromosome pair, likely homologous in both species. While providing useful cytogenetic comparative data against other members of the genus Squalius Bonaparte, 1837, the work aimed to draw attention towards the conservation of two narrow-range and highly confined fish species.

  3. A new species of the Genus Microbrotula (Teleostei: Bythitidae) from Cenderawasih Bay, New Guinea, Indonesia

    DEFF Research Database (Denmark)

    Schwarzhans, Werner; Nielsen, Jørgen

    2012-01-01

    species described here as M. geraldalleni. It belongs to the group of species with 6 caudal and 14 pectoral fin rays and is closest to M. greenfieldi, differing in the higher dorsal and anal fin ray counts (68-73 and 61-65 vs. 62-70 and 58-61, respectively), the presence of 3 posterior mandibular pores...

  4. Lamellodiscus sanfilippoi n. sp. (Monogenea, Diplectanidae parasite branchial de Diplodus sargus (Teleostei, Sparidae en Méditerranée

    Directory of Open Access Journals (Sweden)

    Amine F.

    2006-03-01

    Full Text Available Lamellodiscus sanfilippoi n. sp. entre, parmi les Lamellodiscus, dans le sous-groupe “ergensi” (Amine et Euzet, 2005, caractérisé par la morphologie des barres latérales dorsales du hapteur. Ce sous-groupe comprend, en Méditerranée, L. ergensi Euzet et Oliver, 1966, L. kechemirae Amine et Euzet, 2005 et L. tomentosus Amine et Euzet, 2005 parasites de Diplodus sargus, ainsi que L. baeri Oliver, 1974 parasite de Pagrus pagrus. L. sanfilippoi se distingue de ces espèces par la morphologie et la taille des barres latérales dorsales du hapteur. L’espèce se rapproche de Lamellodiscus furcillatus Kritsky, Jiménez-Ruíz et Sey, 2000, parasite de Diplodus noct du golfe Persique, mais s’en distingue par l’épaisseur des pièces du hapteur et la morphologie de l’appareil copulateur mâle. Lamellodiscus gussevi Sanfilippo (1978 et Lamellodiscus abbreviatus Sanfilippo (1978 sont considérés comme des nomina nuda.

  5. Two new species of Haliotrema (Monogenoidea: Dactylogyridae) from Acanthurus nigrofuscus and Acanthurus olivaceus (Teleostei: Acanthuridae) in the South China Sea.

    Science.gov (United States)

    Sun, Yuan; Kritsky, Delane C; Yang, Tingbao

    2007-08-01

    Haliotrema leporinus n. sp. and Haliotrema pratasensis n. sp. are described from the gills of surgeonfishes (Acanthuridae) off the Pratas Islands in the South China Sea. Haliotrema leporinus n. sp. differs from all other members of the genus by possessing a rabbit-head-shaped sclerotized piece in the haptor. Haliotrema pratasensis n. sp. differs from its congeners by having a copulatory organ with a clockwise coil and a funnel-shaped base and by lacking an accessory piece. PMID:17918356

  6. Lamellodiscus sanfilippoi n. sp. (Monogenea, Diplectanidae) parasite branchial de Diplodus sargus (Teleostei, Sparidae) en Méditerranée

    OpenAIRE

    Amine F.; Neifar L.; Euzet L.

    2006-01-01

    Lamellodiscus sanfilippoi n. sp. entre, parmi les Lamellodiscus, dans le sous-groupe “ergensi” (Amine et Euzet, 2005), caractérisé par la morphologie des barres latérales dorsales du hapteur. Ce sous-groupe comprend, en Méditerranée, L. ergensi Euzet et Oliver, 1966, L. kechemirae Amine et Euzet, 2005 et L. tomentosus Amine et Euzet, 2005 parasites de Diplodus sargus, ainsi que L. baeri Oliver, 1974 parasite de Pagrus pagrus. L. sanfilippoi se distingue de ces espèces par la morphologie et la...

  7. [Lamellodiscus sanfilippoi n. sp. (Monogenea, Diplectanidae) parasite from the gills of Diplodus sargus (Teleostei, Sparidae) in Mediterranean Sea].

    Science.gov (United States)

    Amine, F; Neifar, L; Euzet, L

    2006-03-01

    Lamellodiscus sanfilippoi n. sp. takes place, among the other species of Lamellodiscus, in the "ergensi" sub-group (Amine et Euzet, 2005) characterized by the morphology of the dorsal lateral bars of the haptor. This sub-group comprises, in the Mediterranean, L. ergensi Euzet and Oliver, 1966, L. kechemirae Amine and Euzet, 2005, L. tomentosus Amine and Euzet, 2005, all parasite of Diplodus sargus, and L. baeri Oliver, 1974 parasite of Pagrus pagrus. L. sanfilippoi can be distinguished from the previous species by the morphology and size of the dorsal lateral bars. The new species is close to Lamellodiscus furcillatus Kritsky, Jiménez-Ruiz and Sey, 2000, a parasite of Diplodus noct in the Persian Gulf, but differs by the size of the haptoral sclerotised pieces and the morphology of the male copulatory apparatus. Lamellodiscus gussevi Sanfilippo (1978) et Lamellodiscus abbreviatus Sanfilippo (1978) are considered as nomina nuda. PMID:16605066

  8. Comparative characterization of blood cells and hematological parameters between the mature and immature Caspian Vimba, Vimba vimba persa (Teleostei, Cyprinidae

    Directory of Open Access Journals (Sweden)

    Rohollah Norousta

    2013-05-01

    Full Text Available The aim of the present study was to obtain a basic knowledge of the hematology of CaspianVimba and comparison hematological parameters between immature and mature specimens.Lymphocytes, monocytes, heterophils and eosinophils, were distinguished and characterized.Hematological indices (RBC, WBC, HCT, Hb, MCV, MCH, MCHC and leucocyte differential count weremeasured in one blood sample from 81 Vimba vimba persa captured in South coasts of the Caspian Seaand in River-mouth of the Sefid-roud River in North of Iran. Twenty nine and fifty two of the specimenswere mature and immature, respectively. The mean of counted red blood cell in immature fish was1.80±0.22 × 106 μl-1 and in mature fish was 1.69±0.21 × 106 μl-1. The mean of white blood cell inimmature fish has been counted 5.36±0.78 × 103 μl-1, and in mature fish was 6.02±0.96 × 103 μl-1.Neutrophil in immature fish was 11.17±2.55 percent and in mature was 13.19±2.52 percent, and nobasophils cell has been observed. The rates of clot time in mature and immature fishes were125.38±24.94 and 186.03±25.82 S, respectively. Significant differences were observed in RBC, WBC,neutrophil and the rate of clot time between the mature and immature of the Caspian Vimba. Statisticalanalysis revealed that differences in hematological parameters between male and female fish were notsignificant. Compared to other Cyprinids, this species has higher mean values for HCT and Hb and similarvalue for RBC, and the percent of heterophils was found to be low in relation to the percent oflymphocytes. High lymphocyte counts occurred in V. vimba persa, as compared to these found in otherspecies.

  9. Reproductive biology of Ilisha elongata (Teleostei: Pristigasteridae) in Ariake Sound, Japan: Implications for estuarine fish conservation in Asia

    Science.gov (United States)

    Zhang, Jie; Takita, Toru; Zhang, Chunguang

    2009-01-01

    Elongate ilisha ( Ilisha enlongata) is a commercially important species that contributes to clupeoid fisheries in Asian countries. In the present study, the reproductive biology of I. elongata in Ariake Sound, Japan is determined for the first time. Six maturity stages were described using ovarian and testicular histology throughout the annual cycle. The spawning season in Ariake Sound lasts from May to July, with peak spawning activity in May and June. Age at first maturity was estimated to be 2 years, with a few exceptions of 1 year in well-developed males. Ovaries that contained both tertiary yolk oocytes and postovulatory follicles occurred from late May to late July, indicating that I. elongata is a multiple spawner. The size-frequency distribution of oocytes provided evidence for its multiple spawning and accuracy of the fecundity estimates. The batch fecundity of this species was estimated at between 22,200 and 270,900 eggs per individual, increasing with age between two and six years. The present findings on the reproductive strategy of I. elongata in Ariake Sound are generally consistent with those in temperate or subtropical populations, but quite different from those of tropical population where first maturation occurs around 200 days and life spans are shorter, with a maximum age less than 3 years. The conservation implications of this reproductive strategy in a harsh, variable environment in Asian countries are also discussed.

  10. Densidad y biomasa de Pterois volitans/miles (Teleostei: Scorpaenidae) en arrecifes del litoral oeste de La Habana, Cuba

    OpenAIRE

    García-Rodríguez, Alain; Chevalier Monteagudo, Pedro P.; Cabrera Sansón, Erlán; Caballero Aragón, Hansel; Luis Hernández López, Jorge

    2015-01-01

    El pez león (Pterois volitans/miles) es la primera especie (s) de pez arrecifal del Indo- Pacífico que invade el Atl{ntico Occidental, constituyendo una de las invasiones de peces marinos m{s r{pida de la historia. El objetivo fue determinar la densidad y biomasa de las poblaciones del pez león y sus posibles variaciones temporales y espaciales en arrecifes del oeste de La Habana, Cuba. Los muestreos fueron realizados mediante censos visuales con buceo autónomo en los períodos ...

  11. Further evidence for the invasion and establishment of Pterois volitans (Teleostei: Scorpaenidae) along the Atlantic Coast of the United States

    Science.gov (United States)

    Meister, H.S.; Wyanski, D.M.; Loefer, J.K.; Ross, S.W.; Quattrini, A.M.; Sulak, K.J.

    2005-01-01

    We document the continued population expansion of red lionfish, Pterois volitans, the first documented successful introduction of an invasive marine fish species from the western Pacific to Atlantic coastal waters of the United States. Red lionfish are indigenous to the Indo-Pacific and have apparently established one or more breeding populations on reefs off the southeastern United States. Fifty-nine specimens, most presumably adult red lionfish, were documented or collected on live-bottom reefs off North Carolina, South Carolina, and Florida, and on a manmade structure off Georgia. Observation/collection depths and bottom water temperatures for these fish ranged from 40-99 m and 13.8-24.4??C, respectively. Eleven juvenile lionfish, believed to be expatriated from southeastern waters, were collected in estuaries along the coast of Long Island, NY, at depths of 0-5 m and water temperatures ranging from 13.8-16.5??C. Twelve of the total 70 specimens collected or observed were positively identified as red lionfish. Based on histological assessment of gonad tissue, two reproductively-active males and one immature female were collected. The life history of red lionfish, especially their reproductive biology and food habits, should be investigated along the east coast of the US to determine the potential impacts of this species on ecosystems they have invaded.

  12. Garra kalpangi, a new cyprinid fish species (Pisces: Teleostei from upper Brahmaputra basin in Arunachal Pradesh, India

    Directory of Open Access Journals (Sweden)

    K. Nebeshwar

    2012-02-01

    Full Text Available A new cyprinid species, Garra kalpangi is described from the Kalpangi River (Brahmaputra basin in Arunachal Pradesh, India. The species is closely similar to G. gravelyi, G. rotundinasus and G. elongata in having a shared character i.e. a weakly developed proboscis. It is distinguishable from G. gravelyi for the absence of indistinct black spot at the bases of branched dorsal fin rays and lateral stripes on the side of the body. However, G. rotundinasus possesses lateral stripe along the lateral line. Further, the absence of transverse groove at the tip of snout and longitudinal black band in medial coudal fin differentiated it from G. elongata. The detail comparative account of the 16 available species of northeastern India confirmed its distinct diagnosis as a new species under the genus. Accordingly, after thorough investigation, the taxonomic keys for all the available species under the genus from the region have also been erected in this article.

  13. Feeding ecology of two demersal opportunistic predators coexisting in the northwestern Mediterranean Sea

    Science.gov (United States)

    López, Nieves; Navarro, Joan; Barría, Claudio; Albo-Puigserver, Marta; Coll, Marta; Palomera, Isabel

    2016-06-01

    The study of the feeding ecology of marine organisms is crucial to understanding their ecological roles and advancing our knowledge of marine ecosystem functioning. The aim of this study was to analyse the trophic ecology of two demersal predator species, black anglerfish (Lophius budegassa) and white anglerfish (L. piscatorius), in the northwestern Mediterranean Sea. Both species are important in the study area due to their high abundance and economic value, but information about their feeding behaviour is scarce. Here, we described the diet composition and ecological role of these two species, investigating whether trophic segregation exists between them and amongst fish of different sizes. In addition, by using experimental survey data we described the spatial distribution of both species to help us interpret trophic behaviour patterns. We gathered samples of two different sizes (small individuals of a total length <30 cm and large individuals ≥30 cm) of both species and combined stomach content analyses (SCA) and stable isotope analyses (SIA) of nitrogen and carbon with isotopic mixing models. Our results revealed that both anglerfish species are opportunistic predators, showing a diet composed mainly of fishes and, to a lesser extent, of crustaceans, with a small proportion of cephalopods, gastropods, bivalves and echinoderms. We found trophic segregation between the two species and the two sizes, indicating that they feed on different prey, in line with differences in their spatial distribution within the study area. This partial partition of food resources could also be explained by the differences in rhythms of activity that were reported in previous studies. In addition, although both species occupied a high position within the food web, our results showed that white anglerfish individuals and the large-sized fish of both species held higher trophic positions. This study demonstrates the usefulness of complementary approaches for trophic studies and

  14. Records of Copiatestes filiferus (Leukart, in Sars, 1885 Gibson and Bray, 1977 (Digenea and Gorgorhynchus sp. (Acanthocepahala of marine fish from peruvian coast

    Directory of Open Access Journals (Sweden)

    Manuel Tantaleán V

    2013-06-01

    Full Text Available In this paper, Copiatestes filiferus (Leukart, in Sars, 1885 Gibson and Bray, 1977 (Digenea and Gorgorhynchus sp. (Acanthocephala parasites of Hemilutjanus macrophthalmos (Teleostei, both parasites are new records from Peru and the fish is a new host.

  15. Fish fauna of the Camp dels Ninots locality (Pliocene; Caldes de Malavella, province of Girona, Spain) - first results with notes on palaeoecology and taphonomy

    Czech Academy of Sciences Publication Activity Database

    Přikryl, Tomáš; Gómez de Soler, B.; Oms, O.; Roubach, S.; Blain, H-A.; Agustí, J.

    2016-01-01

    Roč. 28, č. 3 (2016), s. 347-357. ISSN 0891-2963 Institutional support: RVO:67985831 Keywords : Camp dels Ninots * Cyprinidae * maar lake * NE Spain * Pliocene * Teleostei Subject RIV: DB - Geology ; Mineralogy

  16. First insights into the diversity of gill monogeneans of 'Gnathochromis' and Limnochromis (Teleostei, Cichlidae) in Burundi: do the parasites mirror host ecology and phylogenetic history?

    Czech Academy of Sciences Publication Activity Database

    Kmentová, N.; Gelnar, M.; Koblmüller, Stephan; Vanhove, M. P. M.

    2016-01-01

    Roč. 4, e1629 (2016), e1629. ISSN 2167-8359 R&D Projects: GA ČR GBP505/12/G112 Institutional support: RVO:68081766 Keywords : Cichlidogyrus * Ectoparasites * Lake Tanganyika * Limnochromini * Tropheini Subject RIV: EG - Zoology Impact factor: 2.112, year: 2014

  17. Re-description of two species of the cardinalfish genus Archamia (Teleostei: Apogonidae) from the Red Sea and Western Indian Ocean.

    Science.gov (United States)

    Gon, Ofer; Gouws, Gavin; Mwale, Monica; Mwaluma, James

    2013-01-01

    The cardinalfishes Archamia bilineata and A. pallida were originally described from a small number of specimens collected in the Gulf of Aqaba, Red Sea and Oman, respectively. Both species are re-described using specimens collected recently in Yemen and Kenya, including the first known adult of A. pallida. These new collections increased the geographical range of both species considerably. Differences between the two populations now known for each of the species are discussed. PMID:24614490

  18. Genetic, comparative genomic, and expression analyses of the Mc1r locus in the polychromatic Midas cichlid fish (Teleostei, Cichlidae Amphilophus sp.) species group.

    Science.gov (United States)

    Henning, Frederico; Renz, Adina Josepha; Fukamachi, Shoji; Meyer, Axel

    2010-05-01

    Natural populations of the Midas cichlid species in several different crater lakes in Nicaragua exhibit a conspicuous color polymorphism. Most individuals are dark and the remaining have a gold coloration. The color morphs mate assortatively and sympatric population differentiation has been shown based on neutral molecular data. We investigated the color polymorphism using segregation analysis and a candidate gene approach. The segregation patterns observed in a mapping cross between a gold and a dark individual were consistent with a single dominant gene as a cause of the gold phenotype. This suggests that a simple genetic architecture underlies some of the speciation events in the Midas cichlids. We compared the expression levels of several candidate color genes Mc1r, Ednrb1, Slc45a2, and Tfap1a between the color morphs. Mc1r was found to be up regulated in the gold morph. Given its widespread association in color evolution and role on melanin synthesis, the Mc1r locus was further investigated using sequences derived from a genomic library. Comparative analysis revealed conserved synteny in relation to the majority of teleosts and highlighted several previously unidentified conserved non-coding elements (CNEs) in the upstream and downstream regions in the vicinity of Mc1r. The identification of the CNEs regions allowed the comparison of sequences from gold and dark specimens of natural populations. No polymorphisms were found between in the population sample and Mc1r showed no linkage to the gold phenotype in the mapping cross, demonstrating that it is not causally related to the color polymorphism in the Midas cichlid. PMID:20449580

  19. Some aspects of branchial parasitism in Leuciscus cephalus(Teleostei, Cyprinidae: first record of Lamproglena compacta(Cyclopoida, Lernaeidae in Romania

    Directory of Open Access Journals (Sweden)

    Mala-Maria Stavrescu-Bedivan

    2008-12-01

    Full Text Available The present paper records for the first time the presence of the crustacean copepod Lamproglena compacta in the branchial microhabitat of the cyprinid species Leuciscus cephalus that elongs to a lotic Romanian ecosystem. Also, we discuss the affinity for fixing site on gill filaments, the observations being sustained by the t Student statistic test.

  20. Genetic heterogeneity reveals on-going speciation and cryptic taxonomic diversity of stream-dwelling gudgeons (Teleostei, Cyprinidae in the middle Danubian hydrosystem (Hungary.

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    Péter Takács

    Full Text Available Although stream-dwelling gudgeons (Cyprinidae, genus: Gobio are widespread in Central Europe, the taxonomy of this group and the distribution of its species are still unexplored in detail. The aims of our study are to ascertain taxonomic composition and distribution of the former Gobio gobio superspecies in the inner area of the Carpathian Basin. Since the presence of cryptic species is suspected in this area, we examined the taxonomic and phylogenetic relationships of Central European Gobio taxa by sequencing the mitochondrial DNA control region (mtCR. Additionally, we characterized the genetic structure of 27 stream-dwelling gudgeon populations of this area by Amplified Fragment Length Polymorphism (AFLP. Results of mtCR analysis proved the presence of three species already known as G. obtusirostris (dominant in NW-Hungary, G. gobio (sporadic and G. carpathicus (sporadic. Additionally, the analysis revealed the existence of one doubtful taxon, G. sp1 (dominant in NE-Hungary, and a new isolated haplogroup (dominant in SW-Hungary. Although Network analysis showed significant detachment among haplogroups, their genetic distances were quite small. Therefore Bayesian phylogenetic analysis showed weak nodal support for the branching pattern both for newly described haplotypes, and for the already accepted species. AFLP data showed distinct population structure and a clear pattern of isolation was revealed by distance of stocks. At the same time, level of separation was not affected by the altitudinal position of sites. Moreover we found three major clusters of populations which were separated according to hydrographic regions, and corresponded to the findings of mtCR analysis. Our results suggest the on-going speciation of gudgeons in the Carpathian Basin, however the separation of haplogroups seems to only be an intermediate phase. The discovered natural pattern seems to be only slightly influenced by anthropogenic impacts. Additionally our results put into question the suitability of the recently accepted within Gobio genus taxonomy.

  1. Infestation pattern and parasitic castration of the crustacean Riggia paranensis (Crustacea: Cymothoidea on the fresh water fish Cyphocharax gilbert (Teleostei: Curimatidae

    Directory of Open Access Journals (Sweden)

    Juliana de Souza Azevedo

    2006-09-01

    Full Text Available Cyphocharax gilbert infested by Riggia paranensis shows parasitic castration. The prevalence of parasitism in C. gilbert varied among different environments, being higher in the middle rio Itabapoana. Fish were collected monthly using two cast nets (thrown 30 times during the day and gillnets kept in the river during 12 hour, from sunset to sunrise, between September 1997 and August 2000. Infestation pattern was investigated on 1358 specimens. Most of them were infested (57.9%, with one or two parasites; the majority (62.9% was collected during the rainy season (spring-summer. The parasite did not show preference for sex or size of hosts. A total of 91.5% of the 511 examined parasites had a body size that represented 10.1% to 20% of host standard length. The reproductive condition of 311 specimens of R. paranensis was analyzed checking the presence of oocytes in the ovarian and eggs or embryos in the marsupium. Nearly 73% of them were at reproductive phase, and had a body size that represented 5.1% to 20% of host standard length. The size of the immature parasites varied from 0.1% to 5% of the host size. The results suggest that R. paranensis may adopt a fast growth rate strategy and increase the investment in reproduction when they occupy most of the host's pericardial space.Cyphocharax gilbert infestado por Riggia paranensis apresenta castração parasitária. A prevalência do parasito varia entre diferentes ambientes, sendo maior no trecho médio do rio Itabapoana. Os peixes foram coletados mensalmente neste rio usando duas tarrafas (lançadas por 30 vezes durante o dia e redes de espera por 12 horas, do crepúsculo ao amanhecer, entre setembro de 1997 e agosto de 2000. O padrão de infestação foi investigado em 1358 peixes. Peixes infestados apresentaram um ou dois parasitos, representando 57,9% da população e a maioria deles (62,9% foi coletada no período de maior precipitação (primavera-verão. O parasito não apresentou preferência por sexo ou tamanho do hospedeiro. No total, 91,5% de 511 parasitos examinados apresentaram um tamanho corpóreo que representou de 10,1% a 20% do comprimento padrão do hospedeiro. A condição reprodutiva em 311 espécimes R. paranensis foi analisada através da presença de oócitos no ovário e ovos ou embriões no marsúpio, sendo que cerca de 73% estavam em fase de reprodução, apresentando um tamanho corporal que variou entre 5,1% a 20% do comprimento padrão do hospedeiro. O tamanho dos parasitos imaturos variou de 0,1% a 5% do tamanho do hospedeiro. Os resultados sugerem que R. paranensis pode adotar uma estratégia de rápido crescimento e deve aumentar o investimento em reprodução quando ocupa grande parte do espaço disponível na cavidade pericardial do hospedeiro.

  2. Henneguya nagelii n. sp. (Myxozoa: Myxobolidae) in Cyphocharax nagelii (Steindachner, 1881) (Teleostei: Characiformes: Curimatidae) from the Peixe's River, São Paulo State, Brazil.

    Science.gov (United States)

    de Azevedo, Rodney Kozlowiski; Abdallah, Vanessa Doro; Paes, Jaciara Vanessa Krüger; Da Silva, Reinaldo José; Matos, Patrícia; Velasco, Michele; Matos, Edilson

    2013-10-01

    A new species of Myxosporea, Henneguya nagelii n. sp., is described parasitizing the gills of Cyphocharax nagelii collected from Peixe's River, São Paulo State, Brazil. Among the fish examined, 16.7% had gills parasitized by myxosporeans. The plasmodia were white, round, or oval and measured 150-250 μm. The mature spores were fusiform and had smooth wall. The spores measurements were the following: total length, 34.5 ± 4.2 (26.4-39.9) μm; body length, 12.0 ± 0.5 (11.2-11.9) μm; body width, 4.9 ± 0.3 (4.4-5.5) μm; and caudal process length, 22.4 ± 4.0 (14.7-27.3) μm. The polar capsules were elongated and of unequal size, with lengths of 4.9 ± 0.4 (4.0-5.9) μm and 5.2 ± 0.4 (4.6-6.0) μm for the longest and shortest axes, respectively. Capsule width was 1.8 ± 0.2 (1.5-2.2) μm. Each capsule contained a polar filament with six to eight turns. There was no mucous envelope or iodinophilous vacuole. Morphometric differences between this parasite and other species of the genus Henneguya indicated that the parasite observed in C. nagelii is a new species. This is the first species of Myxosporea described in Peixe's River. PMID:23907634

  3. Two new species of Cyphocharax (Teleostei: Characiformes: Curimatidae) from headwaters of the Jequitinhonha and São Francisco river basins, Minas Gerais, Brazil.

    Science.gov (United States)

    Dutra, Guilherme Moreira; Penido, Iago De Souza; Mello, Gabriel Caetano Guimarães De; Pessali, Tiago Casarim

    2016-01-01

    Two new species of Cyphocharax from southeastern Brazil are described. Both new species share with C. punctatus, and C. vanderi the presence of a midlateral series of irregular patches of dark pigmentation along the lateral line. Cyphocharax jagunco, new species, from Rio Jequitinhonha basin, is distinguished from C. lundi, C. punctatus, and C. vanderi by the number of patches of dark pigmentation along lateral line; the number of pored scales posterior to the hypural joint; the number of scales in the lateral line; and the number of scales rows above lateral line. Cyphocharax lundi, new species, from Rio São Francisco basin, is distinguished from C. jagunco, C. punctatus, and C. vanderi by the presence of dark spots above the lateral line; and the number of scales in the lateral line. Comments on the relationships of the new species within Cyphocharax are presented. PMID:27394625

  4. Redescription of Odontostilbe pulchra (Gill, 1858 (Teleostei: Characidae: Cheirodontinae, and description of two new species from the río Orinoco basin

    Directory of Open Access Journals (Sweden)

    Cristina M. Bührnheim

    2007-03-01

    Full Text Available Odontostilbe pulchra, previously considered species inquirenda in Cheirodontinae and doubtfully assigned from the río Orinoco basin, is redescribed with the rediscovery of two syntypes. Originally described to the Island of Trinidad, O. pulchra is widespread in Venezuela, the río Orinoco basin, in smaller coastal drainages of northern South America, in the Lake Valencia system, and río Essequibo basin. A punctual occurrence in the upper rio Negro, near southernmost headwaters of the río Orinoco, extends its distribution to the Amazon basin. Additionally, two new species of Odontostilbe from the río Orinoco basin are described.Odontostilbe pulchra, anteriormente considerada como species inquirenda em Cheirodontinae e registrada com dúvidas para a bacia do río Orinoco, é redescrita com a redescoberta de dois síntipos. Descrita originalmente para a ilha de Trinidad, O. pulchra apresenta-se largamente distribuída na Venezuela, incluindo a bacia do río Orinoco, pequenas bacias costeiras do norte da América do Sul, no sistema do lago Valencia e bacia do río Essequibo. Uma ocorrência pontual na região superior do rio Negro, próximo às cabeceiras do río Orinoco, estende sua distribuição para a bacia Amazônica. Adicionalmente, são descritas duas novas espécies de Odontostilbe da bacia do Orinoco.

  5. Redescription of Odontostilbe pulchra (Gill, 1858) (Teleostei: Characidae: Cheirodontinae), and description of two new species from the río Orinoco basin

    OpenAIRE

    Cristina M. Bührnheim; Luiz R. Malabarba

    2007-01-01

    Odontostilbe pulchra, previously considered species inquirenda in Cheirodontinae and doubtfully assigned from the río Orinoco basin, is redescribed with the rediscovery of two syntypes. Originally described to the Island of Trinidad, O. pulchra is widespread in Venezuela, the río Orinoco basin, in smaller coastal drainages of northern South America, in the Lake Valencia system, and río Essequibo basin. A punctual occurrence in the upper rio Negro, near southernmost headwaters of the río Orino...

  6. Two philometrids (Nematoda: Philometridae) infecting the tigertooth croaker Otolithes ruber (Bloch & Schneider) (Teleostei: Sciaenidae) off Iran, including erection of a new genus

    Czech Academy of Sciences Publication Activity Database

    Moravec, František; Khosheghbal, M.; Pazooki, J.

    2013-01-01

    Roč. 86, č. 1 (2013), s. 33-41. ISSN 0165-5752 R&D Projects: GA ČR GBP505/12/G112 Institutional support: RVO:60077344 Keywords : Philometridae * Iran * Parasitic nematode Subject RIV: EA - Cell Biology Impact factor: 1.035, year: 2013

  7. Phylogenetic position and osteology of Pethia setnai (Chhapgar and Sane, 1992, an endemic barb (Teleostei: Cyprinidae of the Western Ghats, India, with notes on its distribution and threats

    Directory of Open Access Journals (Sweden)

    U. Katwate

    2013-12-01

    Full Text Available Pethia setnai is an endemic and threatened freshwater fish of the Western Ghats of India. It has a restricted distribution in the west flowing rivers in the states of Maharashtra, Goa and Karnataka. We clarify the phylogenetic position of Pethia setnai, provide osteological details of topotypic material, and morphometric data of specimens from Maharashtra, Goa and Karnataka. We also provide details on micro-level distribution, habitat and threats to the species in its native range.

  8. Infrapopulations of Gyliauchen volubilis Nagaty, 1956 (Trematoda: Gyliauchenidae in the rabbitfish Siganus rivulatus (Teleostei: Siganidae from the Saudi coast of the Red Sea

    Directory of Open Access Journals (Sweden)

    Al-Jahdali M.O.

    2012-08-01

    Full Text Available In hermaphroditic helminth parasites, infrapopulation size or mating group size mostly affects some processes acting within the infrapopulation. Here, 30 natural infrapopulations (12-154 individuals of the intestinal trematode Gyliauchen volubilis Nagaty, 1956 from the fish Siganus rivulatus consisting of newly excysted juveniles, immature and mature worms were found distributed in a well-defined fundamental niche (anterior 40 % of the intestine. In small infrapopulations, all stages of the parasite were alive. In larger infrapopulations, differential mortality was only and consistently observed among newly excysted juveniles, and gradually increased to include most or all juveniles in the largest infrapopulations. Among mature worms, the mean worm length seemed unaffected by the infrapopulation size. However, the ratio mean testis size-mean ovary size, a reliable indicator of resource allocation to the male function and of opportunities for crossfertilization, significantly increased with mating group size. In small infrapopulations, all stages of the parasite were scattered along the niche, and never seen in mating pairs (possibly reproduced by selffertilization. In larger infrapopulations, newly excysted juveniles and immature worms were scattered along the anterior two thirds of the niche, while mature worms were constantly found aggregated in its posterior third (narrow microhabitat, where some were arranged in mating pairs. The probability of mating reciprocally or unilaterally was dependent on body size. The mean number of uterine eggs per worm significantly decreased and their mean sizes significantly increased with mating group size. The results are statistically significant and suggest that infrapopulation self-regulation is greatly associated with its size.

  9. Ancyrocephalidae (Monogenea) of Lake Tanganyika. III : Cichlidogyrus infecting the world's biggest cichlid and the non-endemic tribes Haplochromini, Oreochromini and Tylochromini (Teleostei, Cichlidae)

    OpenAIRE

    Bukinga, F. M.; Vanhove, M.P.M.; Van Steenberge, M.; Pariselle, Antoine

    2012-01-01

    Lake Tanganyika is the deepest and oldest African Great Lake and of economic importance. While the diversity of its endemic cichlid radiations yielded scientific interest, a number of cichlid tribes have few representatives in the lake. Some of those, namely Oreochromini (ex-Tilapiini), Haplochromini and Tylochromini, reach higher species numbers in riverine systems. Conversely, the phylogenetic position of the monospecific and endemic Boulengerochromini is unclear. The oreochromines Oreochro...

  10. Ancyrocephalidae (Monogenea) of Lake Tanganyika. IV. Cichlidogyrus parasitizing species of Bathybatini (Teleostei, Cichlidae) : reduced host-specificity in the deepwater realm ?

    OpenAIRE

    Pariselle, Antoine; Bukinga, F. M.; Van Steenberge, M.; Vanhove, M.P.M.

    2015-01-01

    Lake Tanganyika's biodiversity and endemicity sparked considerable scientific interest. Its monogeneans, minute parasitic flatworms, have received renewed attention. Their host-specificity and simple life cycle render them ideal for parasite speciation research. Because of the wide ecological and phylogenetic range of its cichlids, Lake Tanganyika is a "natural experiment" to contrast factors influencing monogenean speciation. Three representatives of Bathybatini (Bathybates minor, B. fasciat...

  11. First insights into the diversity of gill monogeneans of 'Gnathochromis' and Limnochromis (Teleostei, Cichlidae) in Burundi: do the parasites mirror host ecology and phylogenetic history?

    Science.gov (United States)

    Kmentová, Nikol; Gelnar, Milan; Koblmüller, Stephan; Vanhove, Maarten P M

    2016-01-01

    Monogenea is one of the most species-rich groups of parasitic flatworms worldwide, with many species described only recently, which is particularly true for African monogeneans. For example, Cichlidogyrus, a genus mostly occurring on African cichlids, comprises more than 100 nominal species. Twenty-two of these have been described from Lake Tanganyika, a famous biodiversity hotspot in which many vertebrate and invertebrate taxa, including monogeneans, underwent unique and spectacular radiations. Given their often high degrees of host specificity, parasitic monogeneans were also used as a potential tool to uncover host species relationships. This study presents the first investigation of the monogenean fauna occurring on the gills of endemic 'Gnathochromis' species along the Burundese coastline of Lake Tanganyika. We test whether their monogenean fauna reflects the different phylogenetic position and ecological niche of 'Gnathochromis' pfefferi and Gnathochromis permaxillaris. Worms collected from specimens of Limnochromis auritus, a cichlid belonging to the same cichlid tribe as G. permaxillaris, were used for comparison. Morphological as well as genetic characterisation was used for parasite identification. In total, all 73 Cichlidogyrus individuals collected from 'G.' pfefferi were identified as C. irenae. This is the only representative of Cichlidogyrus previously described from 'G.' pfefferi, its type host. Gnathochromis permaxillaris is infected by a species of Cichlidogyrus morphologically very similar to C. gillardinae. The monogenean species collected from L. auritus is considered as new for science, but sample size was insufficient for a formal description. Our results confirm previous suggestions that 'G.' pfefferi as a good disperser is infected by a single monogenean species across the entire Lake Tanganyika. Although G. permaxillaris and L. auritus are placed in the same tribe, Cichlidogyrus sp. occurring on G. permaxillaris is morphologically more similar to C. irenae from 'G.' pfefferi, than to the Cichlidogyrus species found on L. auritus. Various evolutionary processes, such as host-switching or duplication events, might underlie the pattern observed in this particular parasite-host system. Additional samples for the Cichlidogyrus species occuring on G. permaxillaris and L. auritus are needed to unravel their evolutionary history by means of (co-)phylogenetic analyses. PMID:26855869

  12. Ancyrocephalidae (Monogenea) of Lake Tanganyika: I: Four new species of Cichlidogyrus from Ophthalmotilapia ventralis (Teleostei: Cichlidae), the first record of this parasite family in the basin

    OpenAIRE

    Vanhove, Maarten p. m.; Filip A M Volckaert; Antoine Pariselle

    2011-01-01

    Examination of gill parasites from Ophthalmotilapia ventralis (Boulenger, 1898) in Lake Tanganyika (Africa) revealed the presence of four new species of Monogenea, all members of Cichlidogyrus Paperna, 1960 (Ancyrocephalidae). In view of the systematic importance of haptoral structure, the fish host shows a remarkable diversity of morphological groups. Cichlidogyrus vandekerkhovei sp. nov. and C. makasai sp. nov. are especially characterized by the unusual length of the dorsal transverse bar ...

  13. Ancyrocephalidae (Monogenea of Lake Tanganyika: I: Four new species of Cichlidogyrus from Ophthalmotilapia ventralis (Teleostei: Cichlidae, the first record of this parasite family in the basin

    Directory of Open Access Journals (Sweden)

    Maarten P. M. Vanhove

    2011-04-01

    Full Text Available Examination of gill parasites from Ophthalmotilapia ventralis (Boulenger, 1898 in Lake Tanganyika (Africa revealed the presence of four new species of Monogenea, all members of Cichlidogyrus Paperna, 1960 (Ancyrocephalidae. In view of the systematic importance of haptoral structure, the fish host shows a remarkable diversity of morphological groups. Cichlidogyrus vandekerkhovei sp. nov. and C. makasai sp. nov. are especially characterized by the unusual length of the dorsal transverse bar auricles, while C. sturmbaueri sp. nov. is distinguished by the unique shape of the accessory piece of its male copulatory organ. Importantly, C. centesimus sp. nov. displays a number of features new to the genus, namely a spirally coiled thickening at the end of the penis, the absence of an accessory piece in the genital apparatus, and a hitherto unknown uncinuli configuration in the haptor. This is the first record of ancyrocephalid parasites from the Tanganyika basin. Some mechanisms possibly contributing to this yet unknown diversity are discussed, identifying topics deserving further scientific scrutiny.

  14. Ancyrocephalidae (Monogenea) of Lake Tanganyika : I : four new species of Cichlidogyrus from Ophthalmotilapia ventralis (Teleostei : Cichlidae), the first record of this parasite family in the basin

    OpenAIRE

    Vanhove, M.P.M.; Volckaert, F. A. M.; Pariselle, Antoine

    2011-01-01

    Examination of gill parasites from Ophthalmotilapia ventralis (Boulenger, 1898) in Lake Tanganyika (Africa) revealed the presence of four new species of Monogenea, all members of Cichlidogyrus Paperna, 1960 (Ancyrocephalidae). In view of the systematic importance of haptoral structure, the fish host shows a remarkable diversity of morphological groups. Cichlidogyrus vandekerkhovei sp. nov. and C. makasai sp. nov. are especially characterized by the unusual length of the dorsal transverse bar ...

  15. Gonadal Morphogenesis and Sex Differentiation in Intraovarian Embryos of the Viviparous Fish Zoarces viviparus (Teleostei, Perciformes, Zoarcidae): A Histological and Ultrastructural Study

    DEFF Research Database (Denmark)

    Rasmussen, Tina H.; Jespersen, Åse; Korsgaard, Bodil

    2006-01-01

    the male embryos, the germ cells (spermatogonia), in contrast to the germ cells of the ovary, remain quiescent and do not enter meiosis during intraovarian development. However, other structural (somatic) changes, such as the initial formation of the sperm duct (30 dph), the presence of blood vessels...

  16. Ontogeny of corticotropin-releasing factor and of hypothalamic-pituitary-interrenal axis responsiveness to stress in tilapia (Oreochromis mossambicus; Teleostei).

    Science.gov (United States)

    Pepels, Peter P L M; Balm, Paul H M

    2004-12-01

    The ontogeny of the corticotropin-releasing factor (CRF) system and of the ability of the hypothalamic-pituitary-interrenal (HPI) axis to respond to stressors (capture or confinement), or to cortisol treatment was investigated in tilapia (Oreochromis mossambicus). In 2 days post hatching (dph) larvae, the first developmental stage used for immunohistochemistry, CRF-immunoreactivity (ir) was observed in the nucleus preopticus (npo), and in two hypothalamic nuclei (nlt and nrl). In this stage, CRF- and AVT-ir was found in the neural part of the pituitary, and endocrine cells in the pars distalis and pars intermedia contained POMC-derived peptides. In the ventral telencephalon, CRF-ir cells were first observed 5 dph, whereas projections from these cells into the anterior part of the latero-dorsal telencephalon (Dla) from 7 dph onwards. CRF, ACTH, alpha-MSH, and cortisol were quantified by radioimmunoassays in homogenates of the anterior-cranial region of the larvae containing brain, pituitary, and headkidneys. CRF contents increased from 43 +/- 3 to 1070 +/- 70 pg/larvae between 5 and 110 dph. Larvae of age 5, 12, 24, and 42 dph were captured sequentially from a group. All life stages were able to rapidly increase their cortisol content in response to this stressor (ANOVA: P 0.162). Whole brain CRF content did not change during the 20 min stress period and the relationship between CRF-producing neurons and the initial HPI stress response in early life stages remains to be established. Cortisol feeding of 18 and 29 dph larvae for periods ranging from 2 to 24 days resulted in elevations of the CRF content (P larvae cortisol feeding abolished the cortisol response to capture stress as observed in control fed larvae (P larvae. Finally, the stress response to 24 h confinement was compared between saltwater adapted and freshwater adapted juveniles (age 77 dph). Confinement stress (24 h) affected cortisol and CRF content (ANOVA: P larvae (five times higher than in saltwater adapted larvae). Regarding the cortisol response it is concluded that during and after the period of mouth breeding tilapia larvae respond to capture stress in a similar fashion (onset and height) as adults. Previously, we reported that the initial plasma cortisol response to capture stress in adult tilapia occurred independently from changes in plasma ACTH levels. The current finding that also brain CRF contents do not alter during the initial cortisol response in larvae further indicates that the initial cortisol response in this species may be regulated independently from CRF and ACTH. PMID:15560872

  17. Immunocytochemical and ultrastructural characterization of mammosomatotrope-, growth hormone-, and prolactin-cells from the gilthead sea bream (Sparus aurata l., Teleostei): an ontogenic study.

    Science.gov (United States)

    Villaplana, Mariano; García Ayala, Alfonsa; García Hernández, Maria Pilar; Agulleiro, Blanca

    2003-03-01

    Growth hormone (GH), prolactin (PRL), and mammosomatotrope (MS) cells of gilthead sea bream, Sparus aurata, a teleost fish, were studied in specimens from hatching to 15 months (adults) using conventional electron microscopy and an immunogold method using anti-tilapia GH sera and anti-chum salmon PRL serum. MS cells, immunoreactive to both anti-GH sera and anti-PRL sera, had been first identified in fish in a previous study in newly hatched larvae and in older larvae and juvenile specimens of Sparus aurata by light microscopic immunocytochemistry. In the present work, MS cells reacted positively to immunogold label only in older larvae and juveniles and their secretory granules immunoreacted with both GH and PRL antisera or with only one of them. MS cells were ultrastructurally similar to the PRL cells, with which they coincided in time. This is the first report on the ultrastructural characterization of MS cells in fish. In adults, the secretory granules of GH cells (immunoreactive to anti-GH serum) were mainly round, of variable size, and had a homogeneous, highly electron-dense content. Irregularly shaped secretory granules were also present. PRL cells (immunoreactive to anti-PRL serum) were usually observed in a follicular arrangement; they showed few, small, and mainly round secretory granules with a homogeneous and high or medium electron-dense content. Some oval or elongated secretory granules were also observed. GH and PRL cells that showed involutive features were also found. In newly hatched larvae, GH, PRL, and MS cells could not be distinguished either by their ultrastructure or by the immunogold labeling of the secretory granules. In 1-day-old larvae, presumptive GH and PRL cells were observed according to their position in the pituitary gland. In 2-day-old larvae, a few cells showed some of the ultrastructural features described for GH and PRL cells of adults. During development, the number, size, and shape of the secretory granules in both cell types clearly increased and the organelles developed gradually. Some GH cells were found undergoing mitosis. PMID:12520552

  18. Phylogeny of the Neotropical cichlid fish tribe Cichlasomatini (Teleostei: Cichlidae) based on morphological and molecular data, with the description of a new genus

    Czech Academy of Sciences Publication Activity Database

    Musilová, Zuzana; Říčan, Oldřich; Novák, J.

    2009-01-01

    Roč. 47, č. 3 (2009), s. 234-247. ISSN 0947-5745 R&D Projects: GA MŠk LC06073 Institutional research plan: CEZ:AV0Z50450515 Keywords : Cichlasomatini * Andinoacara * Aequidens Subject RIV: EH - Ecology, Behaviour Impact factor: 1.850, year: 2009

  19. Biodiversity and structure of parasite communities in Boops boops (Teleostei: Sparidae) from the Western Mediterranean and off the North East Atlantic coasts of Spain.

    OpenAIRE

    Pérez-del-Olmo, Ana

    2008-01-01

    The present study carried out a detailed assessment of the metazoan parasite fauna in Boops boops (Sparidae) along the Spanish coasts off the Western Mediterranean and North-East Atlantic, which provided taxonomically consistent dataset comprising three levels of parasite community organisation that allowed questions regarding the structure of parasite communities to be addressed. The diversity of the parasite fauna of B. boops appeared to be higher than previously thought, as evidenced by...

  20. Henneguya melini n. sp. (Myxosporea: Myxobolidae), a parasite of Corydoras melini (Teleostei: Siluriformes) in the Amazon region: morphological and ultrastructural aspects.

    Science.gov (United States)

    Mathews, Patrick D; Maia, Antônio A M; Adriano, Edson A

    2016-09-01

    A new species of myxozoan, Henneguya melini sp. n. (Myxosporea: Myxobolidae), was described based on morphologic and ultrastructural features. This is a parasite of the ornamental freshwater fish C. melini from the Rio Negro, and it was found in five of 30 (16.7 %) C. melini examined. The parasite was found in the gill filaments, and the plasmodia had form of round to ellipsoid, with mature and immature spores inside them. The average spore body was 15.5 ± 0.2 μm in length, 4.7 ± 0.1 μm in width, and the tail measured 25.3 ± 0.1 μm in length. The spores showed typical features of the genus Henneguya, with two valves of equal size and two symmetrical polar capsules of 4.8 ± 0.7 μm in length and 1.7 ± 0.3 μm in width. Each polar capsule had a polar filament with five to six turns. Based on morphology (morphologic and ultrastructural data) of the plasmodia and spores and the fact that this is the first report of a Henneguya species in a fish species of the genus Corydoras, it was considered a new myxozoan species. PMID:27206653

  1. Pathological and histometric analysis of the gills of female Hyphessobrycon eques (Teleostei:Characidae) exposed to different concentrations of the insecticide Dimilin(®).

    Science.gov (United States)

    Marcon, Lucas; Lopes, Diego Senra; Mounteer, Ann Honor; Goulart, Amara Manarino Andrade; Leandro, Mila Vasques; Dos Anjos Benjamin, Laércio

    2016-09-01

    Female individuals of Hyphessobrycon eques were exposed to Diflubenzuron (Dimilin(®)) in order to determine whether exposure to sublethal levels of this insecticide causes changes in gill morphology. Fish were exposed to 0.01, 0.1 and 1.0mgL(-1) for 96h and 17 days and then submitted to pathological and histometric evaluation. Pathological lesions, such as hyperplasia, lamellar fusion, vascular congestion, secondary lamellar disarray, vasodilatation, hemorrhage and increased lamellar epithelium, were significantly more common in the gills of fish exposed to Dimilin(®) than the control. Histometric analysis documented significant changes in blood vessel diameter, primary lamellae width and secondary lamellae length, and the appearance of hemorrhage foci in all concentrations tested. Even at low Dimilin(®) concentrations, the histopathological alteration index was mild to moderate, thereby indicating that the function of this tissue was compromised. These findings indicate that indiscriminate use of Dimilin(®) can adversely affect the structural integrity of the gills of H. eques, which can cause numerous problems for fish farming systems. PMID:27232206

  2. Species and hybrid richness in spined loaches of the genus Cobitis (Teleostei:Cobitidae), with a checklist of European forms and suggestions for conservation

    Czech Academy of Sciences Publication Activity Database

    Bohlen, Jörg; Ráb, Petr

    2001-01-01

    Roč. 59, - (2001), s. 75-89. ISSN 0022-1112 R&D Projects: GA ČR GA206/00/0668; GA AV ČR KSK6005114 Keywords : biodiversity * unisexual fish * conservation Subject RIV: EB - Genetics ; Molecular Biology Impact factor: 1.249, year: 2001

  3. Phylogeography of Pteronotropis signipinnis, P. euryzonus, and the P. hypselopterus Complex (Teleostei: Cypriniformes, with Comments on Diversity and History of the Gulf and Atlantic Coastal Streams

    Directory of Open Access Journals (Sweden)

    Richard L. Mayden

    2015-01-01

    Full Text Available The cyprinid genus Pteronotropis is endemic to southeastern Gulf of Mexico and Atlantic Ocean of North America. Never before has the genus been demonstrated to be monophyletic. We investigate both the phylogenetic relationships and the phylogeography of some species in the genus using mitochondrial ND2 sequences. In no analysis is the genus resolved as monophyletic if Notropis harperi is not included in the genus. Biogeographic and phylogeographic evaluations are conducted with Pteronotropis, including P. signipinnis, P. euryzonus, and the P. hypselopterus complex. Patterns of relationships and population genetic analyses support divergences within multiple clades both at the species level and within species that are tied to abiotic changes in the region. Replicated patterns across clades are observed, as well as patterns previously found in other taxa. Pteronotropis hypselopterus is likely not a natural grouping as populations from some drainages form clades more closely related to other species of the genus. The general patterns of relationships indicate likely cryptic species not currently recognized. Finally, the patterns of species relationships and clades and population structuring within species serve as another example of replicated divergences in the biodiversity east and west of the Mobile Bay.

  4. Phylogeography of Pteronotropis signipinnis, P. euryzonus, and the P. hypselopterus Complex (Teleostei: Cypriniformes), with Comments on Diversity and History of the Gulf and Atlantic Coastal Streams.

    Science.gov (United States)

    Mayden, Richard L; Allen, Jason

    2015-01-01

    The cyprinid genus Pteronotropis is endemic to southeastern Gulf of Mexico and Atlantic Ocean of North America. Never before has the genus been demonstrated to be monophyletic. We investigate both the phylogenetic relationships and the phylogeography of some species in the genus using mitochondrial ND2 sequences. In no analysis is the genus resolved as monophyletic if Notropis harperi is not included in the genus. Biogeographic and phylogeographic evaluations are conducted with Pteronotropis, including P. signipinnis, P. euryzonus, and the P. hypselopterus complex. Patterns of relationships and population genetic analyses support divergences within multiple clades both at the species level and within species that are tied to abiotic changes in the region. Replicated patterns across clades are observed, as well as patterns previously found in other taxa. Pteronotropis hypselopterus is likely not a natural grouping as populations from some drainages form clades more closely related to other species of the genus. The general patterns of relationships indicate likely cryptic species not currently recognized. Finally, the patterns of species relationships and clades and population structuring within species serve as another example of replicated divergences in the biodiversity east and west of the Mobile Bay. PMID:26114110

  5. Are rapids a barrier for floodplain fishes of the Amazon basin? A demographic study of the keystone floodplain species Colossomamacropomum (Teleostei: Characiformes).

    Science.gov (United States)

    Farias, Izeni Pires; Torrico, Juan Pablo; García-Dávila, Carmen; Santos, Maria da Conceição Freitas; Hrbek, Tomas; Renno, Jean-François

    2010-09-01

    We investigated demographic history and population structuring of Colossoma macropomum sampled from 14 localities in the Amazon basin and the Bolivian sub-basin; the two basins are separated by a series of 16 rapids. Although genetically differentiated, IMa analyses suggest non-zero bi-directional migration rates, and inter-basin divergence of approximately 17 thousand years ago. Analyses in BEAST indicated that Bolivian C. macropomum has been demographically stable except for a moderate population increase in the last 12 thousand years, while Amazonian C. macropomum has been experiencing demographic growth over the last 350 thousand years, resulting in approximately one order of magnitude increase in coalescent N(e). PMID:20362063

  6. Are rapids a barrier for floodplain fishes of the Amazon basin ? A demographic study of the keystone floodplain species Colossoma macropomum (Teleostei: Characiformes)

    OpenAIRE

    Farias, I. P.; Torrico, J. P.; Garcia-Davila, C.; Santos, M. D. F.; T. Hrbek; Renno, Jean-François

    2010-01-01

    We investigated demographic history and population structuring of Colossoma macropomum sampled from 14 localities in the Amazon basin and the Bolivian sub-basin; the two basins are separated by a series of 16 rapids. Although genetically differentiated, IMa analyses suggest non-zero bi-directional migration rates, and inter-basin divergence of approximately 17 thousand years ago. Analyses in BEAST indicated that Bolivian C. macropomum has been demographically stable except for a moderate popu...

  7. Multi-locus analyses of an Antarctic fish species flock (Teleostei, Notothenioidei, Trematominae): Phylogenetic approach and test of the early-radiation event

    International Nuclear Information System (INIS)

    Clades that have undergone episodes of rapid cladogenesis are challenging from a phylogenetic point of view. They are generally characterised by short or missing internal branches in phylogenetic trees and by conflicting topologies among individual gene trees. This may be the case of the subfamily Trematominae, a group of marine teleosts of coastal Antarctic waters, which is considered to have passed through a period of rapid diversification. Despite much phylogenetic attention, the relationships among Trematominae species remain unclear. In contrast to previous studies that were mostly based on concatenated datasets of mitochondrial and/or single nuclear loci, we applied various single-locus and multi-locus phylogenetic approaches to sequences from 11 loci (eight nuclear) and we also used several methods to assess the hypothesis of a radiation event in Trematominae evolution. Diversification rate analyses support the hypothesis of a period of rapid diversification during Trematominae history and only a few nodes in the hypothetical species tree were consistently resolved with various phylogenetic methods. We detected significant discrepancies among trees from individual genes of these species, most probably resulting from incomplete lineage sorting, suggesting that concatenation of loci is not the most appropriate way to investigate Trematominae species interrelationships. These data also provide information about the possible effects of historic climate changes on the diversification rate of this group of fish. (authors)

  8. Tres nuevas especies de hyphessobrycon grupo heterorhabdus (teleostei: characiformes: characidae), y clave para especies de la cuenca del río orinoco

    OpenAIRE

    García, Carlos; Román, Cesar; Prada, Saul

    2012-01-01

    Se describen tres nuevas especies de Hyphessobrycon grupo heterorhabdus de lacuenca alta del río Orinoco, Orinoquia Colombiana. Hyphessobrycon mavro sp. n.se distingue de los otros Hyphessobrycon conocidos de la cuenca del Orinoco porpresentar 4 a 6 dientes en el maxilar, 17 dientes en el dentario, por la longitud del hocico9,9-15,2 % LC y la ausencia de ganchos en las aletas en machos. Hyphessobrycon nigersp. n. puede distinguirse por presentar nueve dientes en el dentario, cinco escamas con...

  9. Multilocus analyses of an Antarctic fish species flock (Teleostei, Notothenioidei, Trematominae): phylogenetic approach and test of the early-radiation event.

    Science.gov (United States)

    Janko, Karel; Marshall, Craig; Musilová, Zuzana; Van Houdt, Jeroen; Couloux, Arnaud; Cruaud, Corinne; Lecointre, Guillaume

    2011-09-01

    Clades that have undergone episodes of rapid cladogenesis are challenging from a phylogenetic point of view. They are generally characterised by short or missing internal branches in phylogenetic trees and by conflicting topologies among individual gene trees. This may be the case of the subfamily Trematominae, a group of marine teleosts of coastal Antarctic waters, which is considered to have passed through a period of rapid diversification. Despite much phylogenetic attention, the relationships among Trematominae species remain unclear. In contrast to previous studies that were mostly based on concatenated datasets of mitochondrial and/or single nuclear loci, we applied various single-locus and multilocus phylogenetic approaches to sequences from 11 loci (eight nuclear) and we also used several methods to assess the hypothesis of a radiation event in Trematominae evolution. Diversification rate analyses support the hypothesis of a period of rapid diversification during Trematominae history and only a few nodes in the hypothetical species tree were consistently resolved with various phylogenetic methods. We detected significant discrepancies among trees from individual genes of these species, most probably resulting from incomplete lineage sorting, suggesting that concatenation of loci is not the most appropriate way to investigate Trematominae species interrelationships. These data also provide information about the possible effects of historic climate changes on the diversification rate of this group of fish. PMID:21402163

  10. A new genus and species of blind sleeper (Teleostei: Eleotridae) from Oaxaca, Mexico: First obligate cave gobiiform in the western hemisphere

    Science.gov (United States)

    Walsh, Stephen J.; Chakrabarty, Prosanta

    2016-01-01

    Caecieleotris morrisi, new genus and species of sleeper (family Eleotridae), is described from a submerged freshwater cave in a karst region of the northern portion of the State of Oaxaca, Mexico, Río Papaloapan drainage, Gulf of Mexico basin. The new species represents the first cave-adapted sleeper known from the Western Hemisphere and is one of only 13 stygobitic gobiiforms known worldwide, with all others limited in distribution to the Indo-Pacific region. The new taxon represents a third independent evolution of a hypogean lifestyle in sleepers, the others being two species of Oxyeleotris (O. caeca and O. colasi) from New Guinea and a single species, Bostrychus microphthalmus, from Sulawesi. Caecieleotris morrisi, new species, is distinguished from epigean eleotrids of the Western Atlantic in lacking functional eyes and body pigmentation, as well as having other troglomorphic features. It shares convergent aspects of morphology with cave-dwelling species of Oxyeleotris and B. microphthalmus but differs from those taxa in lacking cephalic pores and head squamation, among other characters. Description of C. morrisi, new species, brings the total number of eleotrid species known from Mexico to 12. Seven of these, including the new species, occur on the Atlantic Slope.

  11. Cardicola aurata sp. n. (Digenea: Sanguinicolidae) from Mediterranean Sparus aurata L. (Teleostei: Sparidae) and its unexpected phylogenetic relationship with Paradeontacylix McIntosh, 1934.

    Science.gov (United States)

    Holzer, A S; Montero, F E; Repullés, A; Nolan, M J; Sitja-Bobadilla, A; Alvarez-Pellitero, P; Zarza, C; Raga, J A

    2008-12-01

    A new sanguinicolid trematode, Cardicola aurata sp. n., is described from gilthead seabream Sparus aurata L., from off the Spanish Mediterranean coast. The morphology of C. aurata sp. n. generally agrees with the diagnosis of the genus, however, in contrast to all other reported Cardicola spp. the male pore is located sub-medially at the posterior end of the body instead of sinistrally before the posterior end of the body. Based on a comparison of the morphology as well as partial 28S and ITS2 rDNA sequence data from the present species with that from closely related species, it was decided to emend the diagnosis of Cardicola rather than create a new genus, as the aberrant position of the male pore is likely to be an autapomorphy. The phylogenetic analyses revealed a close relationship between Cardicola and Paradeontacylix, two genera with considerable morphological differences; C. aurata sp. n. occupies a position intermediate to these genera. Thus, a morphological comparison of Cardicola, Paradeontacylix and Braya, a genus which is morphologically similar to Cardicola but clusters basal to the Cardicola/Paradeontacylix clade, was conducted. The results of this comparison showed that despite large differences with regard to body shape, the organisation of the internal organs is very similar in species of Cardicola and Paradeontacylix. The synopsis of morphological data and molecular phylogeny allows for interpretations regarding the importance of different morphological features for the phylogenetic inference of the Sanguinicolidae. PMID:18639649

  12. A new species of Comephoronema (Nematoda: Cystidicolidae) from the stomach of the abyssal halosaur Halosauropsis macrochir (Teleostei) from the Mid-Atlantic Ridge.

    Science.gov (United States)

    Moravec, Frantisek; Klimpel, Sven

    2007-08-01

    A new species of parasitic nematode Comephoronema macrochiri n. sp. (Cystidicolidae), is described from the stomach of the marine deep-sea fish Halosauropsis macrochir (abyssal halosaur) from the Mid-Atlantic Ridge (MAR). The new species, studied with both light and scanning electron microscopy, is characterized mainly by 6 pairs of preanal papillae, by which it principally differs from members of Ascarophis; the spicules are 297-375 microm and 99-120 microm long and fully developed eggs possess 2 long filaments on 1 pole. Rhabdochona beatriceinsleyae is transferred to Comephoronema as C. beatriceinsleyae (Holloway and Klewer, 1969) n. comb. Comephoronema macrochiri differs from all other congeners mainly in having eggs with filaments on 1 pole only, and from individual species by some additional features such as the number of preanal papillae, the shape of pseudolabial projections, and the body and organ measurements. PMID:17918373

  13. Ultrastructure of ovarian follicular epithelium of the amazonian fish Pseudotylosurus microps (Gunther (Teleostei, Belonidae: I. the follicular cells cycle of development

    Directory of Open Access Journals (Sweden)

    Carminda da Cruz-Landim

    2001-03-01

    Full Text Available The present paper deals with the changes on ultrastructural features of the follicular cells along the growth of the oocyte of Pseudotylosurus microps (Gunther, 1868. The epithelium pass from single squamous to pseudostratified and finally cylindric. Remarkable are the changes in the nuclear shapes, the increasing amount of rough endoplasmic reticulum and the formation of large lipid deposits in the follicular cells by the end of vitellogenic phase. Very peculiar intercellular deposits forms between the perinucleolar and vitellogenic phase of oocyte maturation. Although largely referred to in the specialized literature, our attempts to correlate the follicular cells changes with the formation of the oocyte envelopes or even with an endocrine function are not supported by conclusive evidences in the present paper.

  14. Ultrastructural study of spermiogenesis and the spermatozoon of Acanthocephaloides incrassatus (Molin, 1858) (Acanthocephala, Paleacanthocephala, Arhythmacanthidae) from Anguilla anguilla (Pisces, Teleostei) in Urbino ponds (Corsica Island).

    Science.gov (United States)

    Foata, J; Quilichini, Y; Dal Pos, N; Greani, S; Marchand, B

    2012-07-01

    This study deals with first ultrastructure features of Acanthocephaloides incrassatus (Paleacanthocephala, Arhythmacanthidae), a parasite of the fish Anguilla anguilla, reported for the first time in a Mediterranean pond. The spermiogenesis of A. incrassatus shows original specificities which have never been pointed out to this day in ultrastructural studies on spermiogenesis: the centriolar derivative is divided into two parts of different densities: an electron-dense, and the other, electron-lucent; a ring form has been observed on each side of the axoneme; a centriole with one central element. After the elaboration of a flagellum of 9+2 pattern, the centriole migrates in a nuclear groove. Rapidly, the centriole disappears. Then, the flagellum migration occurs by a series of processes and gives rise to a spermatozoon. The spermatozoon of A. incrassatus presents its own specificities: it exhibits an evolution of the centriolar derivative characterized by only nine peripheral elements deprived of a central element in the anterior part, then nine peripheral and one central element, and finally, nine peripheral elements with two central elements. An assumption is emitted on a probable correspondence of the evolution of the derivative centriolar during the spermiogenesis and the evolution that occurs in the spermatozoon. Protein granules also show different sizes and forms, full or emptied of their contents compared with data on other Acanthocephala. PMID:22307764

  15. Asexual Reproduction Does Not Apparently Increase the Rate of Chromosomal Evolution: Karyotype Stability in Diploid and Triploid Clonal Hybrid Fish (Cobitis, Cypriniformes, Teleostei)

    Science.gov (United States)

    Majtánová, Zuzana; Choleva, Lukáš; Symonová, Radka; Ráb, Petr; Kotusz, Jan; Pekárik, Ladislav; Janko, Karel

    2016-01-01

    Interspecific hybridization, polyploidization and transitions from sexuality to asexuality considerably affect organismal genomes. Especially the last mentioned process has been assumed to play a significant role in the initiation of chromosomal rearrangements, causing increased rates of karyotype evolution. We used cytogenetic analysis and molecular dating of cladogenetic events to compare the rate of changes of chromosome morphology and karyotype in asexually and sexually reproducing counterparts in European spined loach fish (Cobitis). We studied metaphases of three sexually reproducing species and their diploid and polyploid hybrid clones of different age of origin. The material includes artificial F1 hybrid strains, representatives of lineage originated in Holocene epoch, and also individuals of an oldest known age to date (roughly 0.37 MYA). Thereafter we applied GISH technique as a marker to differentiate parental chromosomal sets in hybrids. Although the sexual species accumulated remarkable chromosomal rearrangements after their speciation, we observed no differences in chromosome numbers and/or morphology among karyotypes of asexual hybrids. These hybrids possess chromosome sets originating from respective parental species with no cytogenetically detectable recombinations, suggesting their integrity even in a long term. The switch to asexual reproduction thus did not provoke any significant acceleration of the rate of chromosomal evolution in Cobitis. Asexual animals described in other case studies reproduce ameiotically, while Cobitis hybrids described here produce eggs likely through modified meiosis. Therefore, our findings indicate that the effect of asexuality on the rate of chromosomal change may be context-dependent rather than universal and related to particular type of asexual reproduction. PMID:26808475

  16. Rapid range expansion of the "whitefin" gudgeon Romanogobio cf. belingi (Teleostei: Cyprinidae) in a lowland tributary of the Vistula River (Southeastern Poland)

    Czech Academy of Sciences Publication Activity Database

    Nowak, M.; Klaczak, A.; Szczerbik, P.; Mendel, Jan; Popek, W.

    2013-01-01

    Roč. 49, č. 4 (2013), s. 319-326. ISSN 0003-4088 R&D Projects: GA ČR GP206/09/P608 Institutional support: RVO:68081766 Keywords : faunistic * Gobioninae * ichthyofauna monitoring * population dynamics * rare species Subject RIV: EB - Genetics ; Molecular Biology Impact factor: 1.036, year: 2013

  17. New species of Diplectanum (Monogenoidea: Diplectanidae), and proposal of a new genus of the Dactylogyridae from the gills of gerreid fishes (Teleostei) from Mexico and Panama

    Czech Academy of Sciences Publication Activity Database

    Mendoza-Franco, Edgar F.; Roche, D. G.; Torchin, M. E.

    2008-01-01

    Roč. 55, č. 3 (2008), 171-179. ISSN 0015-5683 Institutional research plan: CEZ:AV0Z60220518 Keywords : Monogenoidea * Diplectanidae * Dactylogyridae * Diplectanum * Octouncuhaptor * Diplectanum gatunense * Diplectanum mexicanum * Octouncuhaptor eugerrei * Eugerres brasilianus * Panama * Mexico Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 1.307, year: 2008

  18. Redescripción de Hemibrycon orcesi Böhlke, 1958 y H. polyodon (Gunther, 1864 (Teleostei, Characidae, incluye clave para las especies de Hemibrycon en Ecuador

    Directory of Open Access Journals (Sweden)

    Román-Valencia, C.

    2007-12-01

    Full Text Available Redescription of Hemibrycon orcesi Böhlke, 1958 and H. polyodon (Günther, 1864 (Pisces, Characidae, with a key for the species of Hemibrycon from Ecuador. Hemibrycon orcesi is readily distinguished from its congeners by its 13 to 16 teeth on maxilla, base of caudal fin scaled, 34 to 36 scales on lateral line with pores and 17 to 18 branched anal fin rays. H. polyodon is distinguished from its congeners by simple and branched dorsal fin rays of equal length and shape of humeral spot.

  19. Re-description of Apistogramma payaminonis KULLANDER, 1986, with descriptions of two new cichlid species of the genus Apistogramma (Teleostei, Perciformes, Geophaginae) from northern Peru

    OpenAIRE

    Romer, U.; Soares, D. P.; Davila, C. R. G.; Duponchelle, Fabrice; Renno, Jean-François; Hahn, I.

    2015-01-01

    Apistogramma payaminonis KULLANDER, 1986 is redescribed based on the only two type specimens available, and two new, closely-related Apistogramma species are described from Peru. Data from the original description of A. payaminonis are supplemented with information on phenotypic appearance, which is important for differentiating the taxon from several other species discovered in the last few years. Apistogramma feconat sp. n. is described from four specimens from the catchment of the Rio Tigr...

  20. Description of Apistogramma paulmuelleri sp n., a new geophagine cichlid species (Teleostei : Perciformes) from the Amazon river basin in Loreto, Peru

    OpenAIRE

    Romer, U.; Beninde, J.; Duponchelle, Fabrice; Davila, C. R. G.; Diaz, A. V.; Renno, Jean-François

    2013-01-01

    A new species of Apistogramma is described from Peru, based on a total of 28 specimens collected in a small forest stream in the catchment of a nameless tributary of the Rio Amazonas about 80 kilometres south of Iquitos, Departamento Loreto (approximately 73 degrees 34' W / 04 degrees 24' S). At first sight Apistogramma paulmuelleri sp. n. resembles A. regani, but is differentiated from the latter and all other Apistogramma species by the combination of a large band-like spot on the caudal-fi...

  1. Description of Apistogramma allpahuayo sp. n., a new dwarf cichlid species (Teleostei : Perciformes : Geophaginae) from in and around the Reserva Nacional Allpahuayo Mishana, Loreto, Peru

    OpenAIRE

    Romer, U.; Beninde, J.; Duponchelle, Fabrice; Diaz, A. V.; Ortega, H.; Hahn, I.; Soares, D. P.; Cachay, C. D.; Davila, C. R. G.; Cornejo, S. S.; Renno, Jean-François

    2012-01-01

    A new species of Apistogramma is described from Peru, based on a total of 51 specimens collected in small forest brooks in and around the Reserva Nacional Allpahuayo Mishana in the drainage of the Nanay river basin about 30 kilometres southwest of Iquitos, Departamento Loreto (approximately 73 degrees 25' W/03 degrees 59' S). Apistogramma allpahuayo sp. n. is distinguished from all other Apistogramma species by the combination of black w-shape marking on lower jaw, (in adult males) lyrate cau...

  2. Reproductive activity and recruitment of the yellow-mandi Pimelodus maculatus (Teleostei: Pimelodidae) in the Igarapava Reservoir, Grande River, Southeast Brazil

    OpenAIRE

    Bruno Pereira Maia; Sandra Maria Franco Ribeiro; Paula Maciel Bizzotto; Volney Vono; Hugo Pereira Godinho

    2007-01-01

    The catfish yellow-mandi, Pimelodus maculatus, is a valuable sporting and commercial fish of inland waters of Southeast Brazil including Igarapava Reservoir. It is a short-distance migrant that needs shorter stretches of free-flowing river to spawn compared to other Neotropical migrants. Igarapava Reservoir is one the 13 hydroelectric reservoirs, arranged in a cascade fashion, impounding the 1,300 km-long Grande River, SE Brazil. In this paper, we examined reproductive features and recruitmen...

  3. Activity of the ovarian germinal epithelium in the freshwater catfish, Pimelodus maculatus (Teleostei: Ostariophysi: Siluriformes): germline cysts, follicle formation and oocyte development.

    Science.gov (United States)

    Quagio-Grassiotto, Irani; Grier, Harry; Mazzoni, Talita Sarah; Nóbrega, Rafael Henrique; de Arruda Amorim, João Paulo

    2011-11-01

    Distinct types of oogonia are found in the germinal epithelium that borders the ovarian lamellae of Pimelodus maculatus: A-undifferentiated, A-differentiated and B-oogonia. This is similar to the situation observed for spermatogonia in the vertebrate testis. The single A-undifferentiated oogonia divide by mitosis giving rise to A-groups of single differentiated oogonia, each enclosed by epithelial cells that are prefollicle cells. Subsequently, the single A-differentiated oogonia proliferate to generate B-oogonia that are interconnected by cytoplasmic bridges, hence, forming germline cysts. The prefollicle cells associated with them also divide. Within the germline cysts, B-oogonia enter meiosis becoming oocytes. Meiotic prophase and early folliculogenesis occur within the germline cysts. During folliculogenesis, prefollicle cells grow between the oocytes, encompassing and individualizing each of them. The intercellular bridges disappear, and the germline cysts are broken down. Next, a basement membrane begins to form around the nascent follicle, separating an oocyte and its associated prefollicle cells from the cell nest. Folliculogenesis is completed when the oocyte and the now follicle cells are totally encompassed by a basement membrane. Cells derived from the ovarian stroma encompass the newly-formed ovarian follicle, and become the theca, thereby completing the formation of the follicle complex. Follicle complexes remain attached to the germinal epithelium as they share a portion of basement membrane. This attachment site is where the oocyte is released during ovulation. The postovulatory follicle complex is continuous with the germinal epithelium as both are supported by a continuous basement membrane. The findings in P. maculatus reinforce the hypothesis that ovarian follicle formation represents a conserved process throughout vertebrate evolution. PMID:21630323

  4. 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; Knudsen, Steen W.; Nishida, Mutsumi; Miya, Masaki

    2009-01-01

    found to be monophyletic as sister clade to the rest of Alepocephaliformes. Previously unrecognized clades within the family Alepocephalidae are presented and a clade comprising Alepocephalus, Conocara and Leptoderma was recovered as the most derived. As long as the current classification is being...... followed, the genera Alepocephalus, Bathytroctes, Conocara and Narcetes were all found non-monophyletic. © 2009 The Linnean Society of London, Biological Journal of the Linnean Society, 2009, 98, 923-936....

  5. Families of Cobitoidea (Teleostei; Cypriniformes) as revealed from nuclear genetic data and the position of the mysterious genera Barbucca, Psilorhynchus, Serpenticobitis and Vaillantella

    Czech Academy of Sciences Publication Activity Database

    Šlechtová, Vendula; Bohlen, Jörg; Tan, H. H.

    2007-01-01

    Roč. 44, - (2007), s. 1358-1365. ISSN 1055-7903 R&D Projects: GA ČR GA206/05/2556; GA ČR GA206/00/0668; GA AV ČR IAA600450508; GA MŠk LC06073 Institutional research plan: CEZ:AV0Z50450515 Keywords : Cobitoidea Subject RIV: EB - Genetics ; Molecular Biology Impact factor: 3.994, year: 2007

  6. Ontogenetic, spatial and temporal variations in the feeding ecology of Deuterodon langei Travassos, 1957 (Teleostei: Characidae in a Neotropical stream from the Atlantic rainforest, southern Brazil

    Directory of Open Access Journals (Sweden)

    Jean R. S. Vitule

    2008-01-01

    Full Text Available Information related to the diet of one species always contributes to the knowledge of its bionomy and the functioning of the ecosystem in which the species lives. Therefore, understanding the feeding ecology of one fish population and its ontogenetic, spatial and temporal aspects help to understand the structure of fish assemblages and river communities. Knowledge of this structure is essential for habitat management and biodiversity conservation. The feeding ecology of Deuterodon langei Travassos, 1957 was studied through analyses of diet composition, sharing of resources, feeding strategy and contribution of food items to the width of its niche. The analysis included an assessment of ontogenetic, spatial and seasonal variations. The species was considered omnivorous with great plasticity caused by seasonal variation in food availability throughout the river basin, but mainly through ontogeny. The diet of smaller individuals revealed a predominance of insects and other arthropods, while the diet of larger specimens showed allochthonous plant items as the main components. The low intestinal quotient (IQ values for the smaller individuals were accounted for their mainly insectivorous diet. The greater relative length of the intestine can account for the greater plasticity of the adult diet, enabling them to use diet items of larger size and more difficult digestion, such as plant items. Therefore, shifts in feeding ecology during growth are confirmed in this omnivorous tropical river fish, strengthening the concept that, when comparing food habits among species, fish size must be taken into account. This study also provides needed information regarding the feeding ecology of fishes intrinsically associated with the Atlantic rainforest, one of the most threatened and biodiverse ecosystems of the planet.Informações relacionadas à alimentação de uma espécie contribuem para o conhecimento de sua bionomia e funcionamento do ecossistema no qual ela vive. Desta forma, entender a ecologia alimentar de uma população de peixes e seus aspectos ontogenéticos, temporais e espaciais auxiliam na compreensão da assembléia de peixes e de toda a comunidade de um rio. Reconhecer tal estrutura é fundamental para o manejo e conservação da biodiversidade do habitat. A ecologia alimentar de Deuterodon langei Travassos, 1957 foi analisada por meio da composição da dieta, partilha de recursos, estratégia alimentar e contribuição dos itens alimentares para o nicho alimentar. As análises incluem uma abordagem das variações ontogenéticas, espaciais e temporais. A espécie foi considerada onívora com uma grande plasticidade alimentar causada pela variabilidade sazonal na disponibilidade de recursos e ao longo da bacia hidrográfica, mas principalmente ao longo de sua ontogenia. A dieta dos indivíduos menores revelou uma predominância de insetos e outros artrópodes, enquanto nos indivíduos maiores ocorreu um predomínio de vegetais alóctones. Os baixos valores de Quociente Intestinal (IQ para os indivíduos menores foram associados a uma dieta predominantemente insetívora. Os maiores comprimentos intestinais estiveram associados com uma maior plasticidade dos adultos, os quais são capazes de utilizar itens maiores e de difícil digestão, como itens de origem vegetal. Neste sentido, mudanças na ecologia alimentar durante o crescimento são confirmadas neste peixe onívoro de rios tropicais, ampliando o conceito de que, quando se compara os hábitos alimentares entre espécies, o tamanho dos peixes examinados deve ser levado em consideração. Este estudo contribui também com informações necessárias sobre a ecologia alimentar de peixes intrinsecamente associados com a Floresta Atlântica, um dos mais biodiversos e ameaçados ecossistemas do planeta.

  7. Reproductive activity and recruitment of the yellow-mandi Pimelodus maculatus (Teleostei: Pimelodidae in the Igarapava Reservoir, Grande River, Southeast Brazil

    Directory of Open Access Journals (Sweden)

    Bruno Pereira Maia

    2007-01-01

    Full Text Available The catfish yellow-mandi, Pimelodus maculatus, is a valuable sporting and commercial fish of inland waters of Southeast Brazil including Igarapava Reservoir. It is a short-distance migrant that needs shorter stretches of free-flowing river to spawn compared to other Neotropical migrants. Igarapava Reservoir is one the 13 hydroelectric reservoirs, arranged in a cascade fashion, impounding the 1,300 km-long Grande River, SE Brazil. In this paper, we examined reproductive features and recruitment of the yellow-mandi in Igarapava Reservoir. We also evaluated the role of the Igarapava Fish Ladder (IFL built around Igarapava Dam on the sustainability of its fisheries. Female adult yellow-mandis that were gill netted (nets of 8-20 cm stretch-mesh during the reproductive season of 2002/2003, showed adequate ovarian development, indicated by the gonadosomatic index (12.9 ± 2.1, at mature stage and absolute fecundity (413,794 ± 206,259; range = 125,601-742,026, which were higher than those found in the literature. Postovulatory follicles present in ovarian tissue of 32% of the females examined showed that they possibly could have spawned in the reservoir area. Gill nets of 3-5 cm stretch-mesh aimed at capturing juvenile yellow-mandi were unproductive. These results indicated that Igarapava Reservoir and its reduced catchment area did not provide adequate conditions for recruitment of the yellow-mandi. This fish, the most abundant in the IFL, and those reaching the reservoir tended to remain there since no upstream passage mechanism is present. Thus, the IFL apparently was responsible for maintaining the Igarapava Reservoir stock of yellow-mandi.O mandi-amarelo, Pimelodus maculatus, é um peixe importante nas pescarias comercial e desportiva de águas continentais do Sudeste do Brasil, incluindo o reservatório de Igarapava. Ele é um migrador de curta distância que necessita de segmentos mais curtos de fluxos livres de rios para desovar do que outros migradores. O reservatório de Igarapava é um dos 13 reservatórios hidrelétricos, dispostos em cascata, que fragmentaram os 1.300 km do rio Grande, no sudeste do Brasil. Neste trabalho, examinamos aspectos reprodutivos e o recrutamento do mandi-amarelo no reservatório de Igarapava. Avaliamos também o papel da escada de peixes, construída em torno da barragem de Igarapava, na sustentabilidade da pesca desse peixe no respectivo reservatório. Fêmeas de mandis-amarelos adultas, capturadas durante o período reprodutivo, com redes de emalhar (tamanho de malha entre 8 e 20 cm, medido entre nós opostos, exibiram adequado desenvolvimento ovariano, indicado pelo índice gonadossomático (12,9 ± 2,1, no estádio maduro e fecundidade absoluta (413.794 ± 206.259; amplitude = 125.601-742.026. Esses valores foram mais altos do que os registrados na literatura. Folículos pós-ovulatórios, presentes no ovário de 32% das fêmeas examinadas indicaram que, possivelmente, elas poderiam ter desovado no reservatório. Redes de emalhar de 3-5 cm de malha (medida entre nós opostos, colocadas com o objetivo de se capturar juvenis, mostraram-se improdutivas. Esses resultados indicaram que o reservatório de Igarapava e sua reduzida bacia hidrográfica não teriam condições adequadas para o recrutamento do mandi-amarelo. Esta é a espécie mais abundante na escada de peixes de Igarapava e os indivíduos que atingem o reservatório de Igarapava tenderiam a permanecer ali em razão da inexistência de mecanismo de passagem para montante. Portanto, a passagem de mandis-amarelos pela escada foi, aparentemente, responsável pela manutenção de seu estoque no reservatório de Igarapava.

  8. Multi-locus sequence data reveal a new species of coral reef goby (Teleostei: Gobiidae: Eviota), and evidence of Pliocene vicariance across the Coral Triangle.

    Science.gov (United States)

    Tornabene, L; Valdez, S; Erdmann, M V; Pezold, F L

    2016-05-01

    Here, multi-locus sequence data are coupled with observations of live colouration to recognize a new species, Eviota punyit from the Coral Triangle, Indian Ocean and Red Sea. Relaxed molecular clock divergence time estimation indicates a Pliocene origin for the new species, and the current distribution of the new species and its sister species Eviota sebreei supports a scenario of vicariance across the Indo-Pacific Barrier, followed by subsequent range expansion and overlap in the Coral Triangle. These results are consistent with the 'centre of overlap' hypothesis, which states that the increased diversity in the Coral Triangle is due in part to the overlapping ranges of Indian Ocean and Pacific Ocean faunas. These findings are discussed in the context of other geminate pairs of coral reef fishes separated by the Indo-Pacific Barrier. PMID:27021219

  9. A revision of the Rutilus complex from Mediterranean Europe with description of a new genus, Sarmarutilus, and a new species, Rutilus stoumboudae (Teleostei: Cyprinidae).

    Science.gov (United States)

    Bianco, Pier Giorgio; Ketmaier, Valerio

    2014-01-01

    By combining morphology, ecology, biology, and biogeography with the available molecular (sequence variation of the entire mitochondrial cytochrome b gene; cyt-b) and karyology data, the taxonomy of several species of the Rutilus complex inhabiting southern Europe is revised. Rutilus stoumboudae, new species, is described from Lake Volvi, Greece. It differs from Rutilus rutilus in possessing more total GR and less branched rays in both dorsal and anal fins and in its placement in the cyt-b based phylogeny of the genus. The resurrected genus Leucos Heckel, 1843 (type species Leucos aula, Bonaparte, 1841), which according to molecular data diverged from Rutilus more than 5 million years ago, during the Messinian salinity crisis, includes five species of small size, without spinous tubercles on scales and head in reproductive males, pharyngeal teeth formula 5-5, and all show a preference for still waters. Leucos aula is the Italian species endemic in the Padany-Venetian district: L. basak is widespread in Croatia, Albania, Montenegro and former Yugoslav Republic of Macedonia (FYROM); L. albus, recently described from Lake Skadar, Montenegro, is also found in rivers Moraca and Zeta (Montenegro). L. albus differs from L. basak, its closest relative, in having more scales on the LL and less anal-fin rays; L. panosi is endemic to the western-Greece district, and L. ylikiensis is endemic to lakes Yliki and Paralimni in eastern Greece (introduced in Lake Volvi). Among the nominal species examined, Rutilus karamani, R. ohridanus, R. prespensis and R. prespensis vukovici are all junior synonyms of Leucos basak. Rutilus vegariticus is definitively regarded as junior synonym for R. rutilus. Sarmarutilus n.gen. is a monotypic genus, with Sarmarutilus rubilio as the type species. According to phylogenetic data, Sarmarutilus rubilio is basal to a cluster of species that includes Leucos basak, L. albus, L. aula, L. panosi and L. ylikiensis. Sarmarutilus possibly evolved in pre-Messinian time, in the Lago Mare, entered the Mediterranean area during the Messinian Lago Mare phase of the Mediterranean Sea and survived only in the Tuscany- Latium district. This genus differs from Leucos in having large pearl organs on the central part of head and body scales in mature males and for the habitat preference, being a riverine-adapted species. It differs from Rutilus in pharyngeal teeth formula (5-5 in Sarmarutilus and 6-5 in Rutilus), size (small in Sarmarutilus and large in Rutilus) and for the preferential habitat (riverine vs. still water). Finally, lectotypes for Leucos basak, Leucos aula, and Sarmarutilus rubilio are designated. PMID:25082046

  10. Cytogenetic analysis of three sea catfish species (Teleostei, Siluriformes, Ariidae with the first report of Ag-NOR in this fish family

    Directory of Open Access Journals (Sweden)

    Mauro Nirchio

    2010-01-01

    Full Text Available Despite their ecological and economical importance, fishes of the family Ariidae are still genetically and cytogenetically poorly studied. Among the 133 known species of ariids, only eight have been karyotyped. Cytogenetic analyses performed on Genidens barbus and Sciades herzbergii revealed that both species have 2n = 56 chromosomes and Cathorops aff. mapale has 2n = 52 chromosomes: Genidens barbus has 10 Metacentrics (M, 14 Submetacentrics (SM, 26 Subtelocentrics (ST, and 6 Acrocentrics (A, Sciades herzbergii has 14M, 20SM, 18ST and 4A, whereas Cathorops aff. mapale has 14M, 20SM, and 18ST. The nucleolus organizer regions (NORs were found in a single chromosome pair on the short arm of a large-sized ST pair in Genidens barbus and on the short arm of a middle-size SM pair in Cathorops aff. mapale. Multiple NORs on the short arms of two large-sized ST pairs were found in Sciades herzbergii. The occurrence of diploid numbers ranging from 2n = 52 through 56 chromosomes and the presence of different karyotypic compositions, besides the number and position of NORs suggest that several numeric and structural chromosome rearrangements were fixed during the evolutionary history of this fish family.

  11. Phylogenetic relationships of Cyprinidae (Teleostei: Cypriniformes) inferred from the partial S6K1 gene sequences and implication of indel sites in intron 1

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    The family Cyprinidae is widely distributed in East Asia, and has the important phylogenetic signifi- cance in the fish evolution. In this study, the 5′ end partial sequences (containing exon 1, exon 2 and indel 1) of S6K1 gene were obtained from 30 representative species in Cyprinidae and outgroup using PCR amplification and sequencing. The phylogenetic relationships of Cyprinidae were reconstructed with neighbor joining (NJ), maximum parsimony (MP), maximum likelihood (ML), and Bayesian meth- ods. Myxocyprinus asiaticus (Catostomidae) was assigned to the outgroup taxon. Similar phylogenetic relationships within the family Cyprinidae were achieved with the four analyses. Leuciscini and Barbini were monophyletic lineages respectively with the high nodal supports. Leuciscini comprises Hypophthalmichthyinae, Xenocyprinae, Cultrinae, Gobioninae, Acheilognathinae and East Asian species of Leuciscinae and Danioninae. Monophyly of East Asian clade was supported with high nodal support. Barbini comprises Schizothoracinae, Barbinae, Cyprininae and Labeoninae. The monophyletic lineage consisting of Danio rerio, D. myersi, and Rasbora trilineata was basal in the tree. In addition, the large fragment indels in intron 1 were analyzed to improve the understanding of Cyprinidae relationships. The results showed that the large fragment indels were correlated with the relations among species. Some conserved regions in intron 1 were thought to be involved in the functional regulation. However, no correlation was found between sequence variations and species characteristic size.

  12. [Hyphessobrycon taphorni and H. eschwartzae (Teleostei: Characidae) two new species of fish in the basin of Madre de Dios river, Peru].

    Science.gov (United States)

    Garcia-Alzate, Carlos A; Romin-Valencia, César; Ortega, Hernán

    2013-06-01

    Hyphessobrycon with 129 valid species, is a genus of fish that has a great diversity of species in the Neotropical ichthyofauna, reaches its greatest diversity in the Amazon basin with about 70% of these species, is highly desired by hobbyists because of their beauty and color, and are still meeting new species. We analyzed specimens from the Departamento de Ictiología, Museo de Historia Natural de la Universidad Mayor de San Marcos, Lima, Perú (MUSM); and measurements of the specimens were taken point to point with digital calipers. Observations of bone and cartilage structures were made on cleared and stained (C&S) samples. The morphometric relationships between species using 21 variables were explored using a principal component analysis (PCA). Here we describe two new species, Hyphessobrycon taphorni and H. eschwartzae from the Madre de Dios River drainage, Peru. Hyphessobrycon taphorni sp. n. can be distinguished by the number of dorsal-fin rays (iii, 8), by the number of: pored lateral-line scales (4-5), teeth in the outer premaxillary row (1-2), teeth in the inner premaxillary row (7-8), by: the caudal-peduncle length (11.4-16.4% SL), number of lateral scales (28-29, except from H. loretoensis which has 29-30) and absence of a humeral spot (vs. present), it differs from H. loretoensis by the number of: scales between the lateral line and the anal fin origin (4 vs. 3) and maxillary teeth (2 vs. 3-4), and it differs from H. agulha by the number of branched pectoral-fin rays (11-12 vs. 9-10). Hyphessobrycon eschwartzae sp. n. is distinguished by the number of: simple anal-fin rays (iv), teeth on the dentary (13-15), teeth in the inner premaxillary row (6), teeth in the outer premaxillary row (3, except from H. heterorhabdus and H. loretoensis which have 3-4); it differs from H. loretoensis by the number of: pored lateral-line scales (7 vs. 9-10), scales between the lateral line and the dorsal-fin origin (5 vs. 3-4); it differs from H. agulha in the number of lateral scales (30-31 vs. 33-34), by the number of: predorsal scales (9 vs. 10), maxillary teeth (4 vs. 0-1); in having in life a red lateral stripe above the dark lateral stripe that extends from the posterior part of the opercle to the caudal peduncle (vs. absent) and by the presence of bony hooks in mature males only on the anal fin (vs. hooks on all fins, including the caudal). PMID:23885596

  13. Partitioning of Habitat and Prey by Abundant and Similar-sized Species of the Triglidae and Pempherididae (Teleostei) in coastal waters

    Science.gov (United States)

    Platell, M. E.; Potter, I. C.

    1999-02-01

    The aim of this study was to determine whether certain co-occurring and abundant species of the teleost families Triglidae and Pempherididae are segregated spatially and/or by diet, and are thus less likely to be susceptible to competition for resources. Nocturnal otter trawling in shallow (5-15 m) and deeper (20-35 m) waters in four regions along ˜200 km of the south-western Australian coastline collected large numbers of a wide size range of the triglids Lepidotrigla modestaand Lepidotrigla papilioand the pempheridids Pempheris klunzingeriand Parapriacanthus elongatus. Although these four species frequently co-occurred at several sites, each species attained its highest density at different sites, thereby representing a partial segregation of these species by habitat. This even occurred with the congeneric triglid species, with L. modestabeing most abundant in the four deep, offshore sites, while L. papiliowas most numerous at three sites which varied in depth and distance from shore. Although triglids and pempheridids both consumed substantial amounts of amphipods and mysids, only the members of the latter family ingested a large amount of errant polychaetes. The latter difference is assumed to reflect the fact that, in comparison with triglids, pempheridids can swim faster, have a mouth adapted for feeding upwards in the water column and feed at night when errant polychaetes emerge from the substratum. Although the dietary compositions of L. modestaand L. papiliodid not differ significantly when analyses were based on dietary data for all sites, they did differ significantly when analyses were restricted to dietary data obtained when both species were abundant and co-occurred. The likelihood of competition for food is thus reduced in the latter circumstances. In comparison with P. klunzingeri, P. elongatusconsumed a relatively larger volume of amphipods and a relatively smaller volume of mysids, which are more mobile, implying that P. elongatusfeeds to a greater extent on rather than above the substratum surface. The diets of all species underwent ontogenetic changes, which were particularly marked in P. klunzingeriwhere an increase in body size was accompanied by a reduced consumption of mysids and an increased ingestion of errant polychaetes and amphipods. The fact that L. modesta, L. papilio, P. klunzingeriand P. elongatusare partially segregated by habitat and feed on suites of prey which differ in composition, allied with an interfamilial difference in the time of feeding, would reduce the likelihood of competition for resources amongst these four species, when they co-occur and are abundant. Furthermore, ontogenetic changes in diet would reduce the potential for intraspecific competition for food.

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

    Directory of Open Access Journals (Sweden)

    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.

  15. Population genetic structure of the striped silverside, Atherinomorus endrachtensis (Atherinidae, Atheriniformes, Teleostei), inhabiting marine lakes and adjacent lagoons in Palau: marine lakes are "Islands" for marine species.

    Science.gov (United States)

    Gotoh, Ryo O; Chiba, Satoru N; Goto, Tadasuke V; Tamate, Hidetoshi B; Hanzawa, Naoto

    2011-01-01

    Although evidence for the evolution of terrestrial species on islands continues to rapidly accumulate, little is known about the evolution of marine species in geographically isolated environments such as islands as ocean currents often facilitate gene flow among populations. In this study, we focused on marine lakes of the Palau Islands, which are considered to be true analogues of terrestrial islands for marine species. To examine evolutionary processes in marine lakes, we conducted population genetic analyses on marine lake and lagoon populations of the striped silverside, Atherinomorus endrachtensis, using two mitochondrial DNA markers differing in evolutionary rate, the cytochrome b gene and the control region. The analyses revealed that the amount of genetic diversity of marine lake populations is much lower than that of lagoon populations and high levels of genetic differentiation occur among marine lake and lagoon populations. The present study has shown that marine lake populations have been completely isolated and have differentiated from lagoon populations, and each marine lake population is experiencing different evolutionary processes. These findings clearly demonstrate that marine lakes are excellent environments for the evolutionary study of marine species. PMID:22362031

  16. Garra mondica, a new species from the Mond River drainage with remarks on the genus Garra from the Persian Gulf basin in Iran (Teleostei: Cyprinidae).

    Science.gov (United States)

    Sayyadzadeh, Golnaz; Esmaeili, Hamid Reza; Freyhof, Jörg

    2015-01-01

    Garra mondica, new species, from the Mond River drainage in Iran is distinguished from its congeners by having 7½ branched dorsal-fin rays; the breast, belly and back in front of the dorsal-fin origin naked and 9+8 branched caudal-fin rays. Garra mondica is also distinguished from all other congeners in the Persian Gulf basin, except an unidentified species from the Kol River, by having two fixed, diagnostic nucleotide substitutions in the mtDNA COI barcode region. The identity of G. gymnothorax, a nominal species from the Karun River drainage, and G. crenulata, a nominal species from Central Iran, are discussed. Garra populations examined from the Karun have a unique mtDNA COI barcode sequence, but their diagnostic characters are not consistent with the description and syntypes of G. gymnothorax. G. crenulata is considered as a synonym of G. rufa. Two populations of Garra from the Kol River have a sequence of the COI barcode region very similar to G. mondica, but cannot be identified as G. mondica and their identity cannot be resolved here. PMID:26624737

  17. 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

  18. Dynamics and cytochemistry of oogenesis in Astyanax fasciatus (Cuvier (Teleostei, Characiformes, Characidae from Rio Sapucaí, Minas Gerais State, Brazil

    Directory of Open Access Journals (Sweden)

    José Antônio Dias Garcia

    2001-12-01

    Full Text Available Oogenesis involves a set of transformations which are undergone by female germ cells These cells change into oogonias and then into mature oocytes. Sexually mature female fish were collected monthly, during one year, from the Sapucaí River, a tributary of the Rio Grande, which is part of the Furnas Reservoir in the state of Minas Gerais. During the several stages of maturation, we observed small round oogonias with a large nucleus, a single nucleolus, and weakly stained cytoplasm with eosinophilic granules. The primary oocytes showed a large basophilic nucleus, with a developed peripheral nucleolus and a reduced cytoplasm. The previtellogenic oocytes presented voluminous cytoplasm and nucleus with several small peripheral nucleoli. The oocytes underwent vitellogenesis with the development of the zona radiata and the follicle cells. Their cytochemical reactions indicated that the two layers of the zona radiata of A. fasciatus contained proteins and polysaccharides. The initially squamous follicle cells, became cuboidal. In mature oocytes, the nucleus moved toward the periphery, next to the micropyle, and the yolk granules formed by proteins, fulfilled the cytoplasm. The clear unstained vesicles are likely to be the cortical alveoli in the perivitelline region.

  19. Ice age cloning - comparison of the Quaternary evolutionary histories of sexual and clonal forms of spiny loaches (Cobitis; Teleostei) using the analysis of mitochondrial DNA variation

    Czech Academy of Sciences Publication Activity Database

    Janko, Karel; Culling, M.; Ráb, Petr; Kotlík, Petr

    Šibenik: Croatian Ichthyological Society, 2006, s. 28. [3rd International Conference Loaches of the Genus Cobitis and Related Genera. Šibenik (HR), 24.09.2006-29.09.2006] Institutional research plan: CEZ:AV0Z50450515 Keywords : ice age cloning Subject RIV: EB - Genetics ; Molecular Biology

  20. Composição em tamanho dos peixes (Actinopterygii, Teleostei de ribeirões da bacia do rio Tibagi, Paraná, Brasil

    Directory of Open Access Journals (Sweden)

    Shibatta Oscar A.

    2003-01-01

    Full Text Available The standard length of 7610 specimens of 43 species from eight streams of rio Tibagi basin was obtained in order to analyze the means of fish sizes. The higher mean size was observed in Gymnotus carapo Linnaeus, 1758 (165,5 mm and the smaller, in Phalloceros caudimaculatus (Hensel, 1868 (16,25 mm. Some fish like Acestrorhynchus lacustris (Reinhardt, 1874, Leporinus obtusidens (Valenciennes, 1836, Gymnotus carapo Linneus, 1758 and Synbranchus marmoratus Bloch, 1795 can reach big or medium size when adults but were collected only young, evidencing they use some streams in beginning of life. The mean size of total species was 49,81mm, what shows the small size composition of fishes in the streams. The Kolmogov-Smirnov test comparing the mean size of all streams showed significant similar size both in upstream and downstream regions, independent to the different environmental conditions.

  1. Ecología poblacional de Cyprinus carpio (TELEOSTEI) en los Humedales de Ajó, Buenos Aires

    OpenAIRE

    Maiztegui, Tomás

    2016-01-01

    Este trabajo tuvo como objetivo principal conocer la biología y ecología poblacional de la carpa común (Cyprinus carpio) en los Humedales de Ajó, con el fin de aportar información que permita diseñar estrategias enfocadas en el manejo de esta especie exótica dentro de esta área protegida. La hipótesis central se basó en comprobar que la carpa común en los Humedales de Ajó ha encontrado un ambiente propicio para el desarrollo de una población local auto-sostenida y se convirtió en la especie d...

  2. Asexual Reproduction Does Not Apparently Increase the Rate of Chromosomal Evolution: Karyotype Stability in Diploid and Triploid Clonal Hybrid Fish (Cobitis, Cypriniformes, Teleostei)

    Czech Academy of Sciences Publication Activity Database

    Majtánová, Zuzana; Choleva, Lukáš; Symonová, Radka; Ráb, Petr; Kotusz, J.; Pekárik, L.; Janko, Karel

    2016-01-01

    Roč. 11, č. 1 (2016), e0146872-e0146872. E-ISSN 1932-6203 R&D Projects: GA ČR GAP506/10/1155; GA ČR GPP506/12/P857; GA ČR GA13-12580S Institutional support: RVO:67985904 Keywords : in-situ hybridization * fresh water fish * unisexual salamanders Subject RIV: EG - Zoology Impact factor: 3.234, year: 2014

  3. A new species of freshwater eel-tailed catfish of the genus Tandanus (Teleostei: Plotosidae) from the Wet Tropics Region of Eastern Australia

    Science.gov (United States)

    Welsh, Stuart; Jerry, Dean R.; Burrows, Damien

    2014-01-01

    Tandanus tropicanus, new species, is described based on specimens from streams in the wet tropics region of northeast Queensland. Previously, two species were recognized in the genus Tandanus: T. tandanus of eastern Australia and T. bostocki of Western Australia. A combination of meristic and morphometric characters distinguishes the new species from all congeners. Further, taxonomic distinctness based on morphologic differences between the new species and all congeners is corroborated by genetic analyses.

  4. CEPF Western Ghats Special Series: Re-description of Hypselobarbus lithopidos (Teleostei: Cyprinidae, based on its rediscovery from the Western Ghats, India, with notes on H. thomassi

    Directory of Open Access Journals (Sweden)

    J.D.M. Knight

    2013-09-01

    Full Text Available In recent times, though the genus Hypselobarbus has been studied substantially, the identities of individual species remain ambiguous. Hypselobarbus lithopidos has been assessed as Data Deficient in the IUCN Red List of Threatened Species with a speculation that it could possibly be extinct as there has not been any validated record of this species since 1941 from its known range. In this work we report a population of this species from its type locality and re-describe this little known species to clear any taxonomic ambiguity that surrounds the identity of this species. We also attempt to clear the taxonomic ambiguity that surrounds the identity of the Critically Endangered H. thomassi with fresh collections from the type locality are discussed.

  5. On the identities of Barbus mussullah Sykes and Cyprinus curmuca Hamilton with notes on the status of Gobio canarensis Jerdon (Teleostei: Cyprinidae).

    Science.gov (United States)

    Knight, J D Marcus; Rai, Ashwin; D'souza, Ronald K P

    2013-01-01

    The identity and generic placement of Barbus mussullah Sykes, the type species of Hypselobarbus Bleeker, have for long been unclear, variously having been considered a synonym of Cyprinus curmuca Hamilton or a species of Tor Gray or Gonoproktopterus Bleeker. Here, through a re-examination of the original descriptions and the examination of specimens from western peninsular India, we redescribe H. mussullah and show that Hypselobarbus is a valid genus, of which Gonoproktopertus is a junior synonym. Hypselobarbus mussullah is distinguished from all other species of Hypselobarbus by possessing both rostral and maxillary barbels; having the last simple dorsal-fin ray weak and smooth; the lateral line complete, with 41 +1 pored scales; 9/1/4 scales in transverse line between origins of dorsal and pelvic fins; and 5½ scales between lateral line and anal-fin origin. Species of Hypselobarbus are distinguished from other genera of Cyprinidae by possessing long, branched gill rakers and the anal fin distally rounded in adults. Hypselobarbus canarensis was found to be a valid species and H. kurali is considered its synonym. Hypselobarbus canarensis can be distinguished from all congeners by possessing both rostral and maxillary barbels; having the last simple dorsal-fin ray weak and smooth; the lateral line complete, with 40-42+1 pored scales; ½7-½8/1/3½ scales in transverse line from dorsal-fin origin to pelvic-fin origin; 4½ scales between lateral line and anal-fin origin. Hypselobarbus kolus is considered a synonym of H. curmuca, which is redescribed: it is distinguished from all congeners by possessing maxillary barbels only; the last simple dorsal-fin ray weak and smooth; 41-43+1 lateral-line scales; 9-10/1/4½-5 scales in transverse line between origins of dorsal and pelvic fins; and 5½-6 scales between lateral line and anal-fin origin.  PMID:25113692

  6. Systematic status of Systomus rubrotinctus Jerdon (Teleostei: Cyprinidae) with notes on the Puntius arulius group of fishes

    OpenAIRE

    J.D.M. Knight; K.R. Devi; V. Atkore

    2011-01-01

    Systomus rubrotinctus Jerdon has long been considered a synonym of Puntius arulius. Examination of ‘P. arulius’ collected from various parts of the Western Ghats revealed the presence of two distinct species: and the fish considered by Day as ‘P. arulius’ from Wayanad is in fact P. rubrotinctus. Based on the colour pattern, morphometrics and meristics, P. rubrotinctus is retrieved from the synonymy of P. arulius and redescribed. Puntius rubrotinctus can be distinguished from P. arulius by t...

  7. Rediscovery of Hypselobarbus pulchellus, an endemic and threatened barb (Teleostei: Cyprinidae of the Western Ghats, with notes on H. dobsoni and H. jerdoni

    Directory of Open Access Journals (Sweden)

    J.D.M. Knight

    2013-12-01

    Full Text Available Hypselobarbus pulchellus, is a poorly known species, with very few verifiable records since its description in 1870. Many authors have considered H. pulchellus to be a synonym of either H. dobsoni or H. jerdoni. This lack of information and clarity on its identity has led to H. pulchellus being categorized as a ‘Critically Endangered’ (possibly Extinct species in the IUCN Red List of Threatened Species. Based on the collection of H. pulchellus from its type locality, we re-describe this little known species, and clear its taxonomic ambiguity vis-à-vis H. dobsoni and H. jerdoni.

  8. A new Synbranchus (Teleostei: Synbranchiformes: Synbranchidae from ilha de Marajó, Pará, Brazil, with notes on its reproductive biology and larval development

    Directory of Open Access Journals (Sweden)

    Sandra E. Favorito

    2005-09-01

    Full Text Available Synbranchus lampreia, new species, is described from rio Goiapi, Marajó Island, Pará, northern Brazil. It differs from the other two described species of the genus by its color pattern, which consists of large roundish black blotches scattered over a light brown or yellowish ground pigmentation and presence of inconspicuous brown small spots distributed among the large dark spots. The species is further distinguished from S. marmoratus by a higher number of vertebrae and from S. madeira by a shorter postanal length. Information about reproductive aspects is provided and larval stages are described and illustrated.Uma espécie nova de Synbranchus é descrita do rio Goiapi, ilha de Marajó, Pará, norte do Brasil. Esta espécie distingue-se de suas duas congêneres pelo colorido do corpo, que consiste em manchas negras arredondadas distribuídas sobre coloração marrom clara ou amarelada e presença de pequenas manchas marrons relativamente inconspícuas distribuídas entre as grandes manchas escuras. A espécie difere ainda de S. marmoratus pelo elevado número de vértebras e de S. madeira pelo menor comprimento pós-anal. São apresentadas informações sobre aspectos reprodutivos, descrições e ilustrações de estágios larvais.

  9. Anatomia funcional e morfometria dos intestinos e dos cecos pilóricos do teleostei (pisces de água doce Brycon orbignyanus (Valenciennes, 1849

    Directory of Open Access Journals (Sweden)

    Seixas Filho José Teixeira de

    2000-01-01

    Full Text Available O objetivo do presente trabalho foi estudar a anatomia funcional e a morfometria comparativas nos intestinos médio e posterior e nos cecos pilóricos da piracanjuba (Brycon orbignyanus Valenciennes, 1849 (Characiformes, Characidae, Bryconinae. Foram conduzidos estudos anatomofuncionais e morfométricos nos intestinos médio e posterior e nos cecos pilóricos dessa espécie com hábito alimentar onívoro. Constatou-se, por meio destes estudos, que o padrão de enrolamento das alças intestinais em arranjo em N apresentou, na segunda classe de tamanho, freqüentes variações no intestino médio, mas foi compatível com os de outras espécies de hábitos alimentares similares. Os estudos da morfometria mostraram que o comprimento total do intestino e das alças intestinais e seus calibres, provavelmente, exercem função específica na absorção dos nutrientes. As relações entre o arranjo das pregas da mucosa e a velocidade de transporte do alimento no intestino médio sugerem que os padrões transversal e oblíquo retardam o avanço do alimento em sentido aboral, possibilitando maior período digestivo e melhor aproveitamento dos nutrientes, contribuindo para a preparação do bolo fecal. O comprimento e o calibre dos cecos pilóricos aumentam com o desenvolvimento do peixe, e o seu padrão de mucosa possui características anatômicas semelhantes às do intestino.

  10. The translocated Liza haematocheila (Teleostei: Mugilidae) as a new host of four species of Saturnius Manter, 1969 (Digenea: Hemiuridae) within its invasive range in the Black Sea

    Czech Academy of Sciences Publication Activity Database

    Pankov, P.; Gibson, D. I.; Kostadinova, Aneta

    2009-01-01

    Roč. 74, č. 1 (2009), s. 29-39. ISSN 0165-5752 R&D Projects: GA MŠk LC522 Institutional research plan: CEZ:AV0Z60220518 Keywords : Liza haematocheila * Saturnius * Digenea * Hemiuridae * invasive species Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 0.911, year: 2009

  11. The morphology of the cement gland apparatus of larval Pterophyllum scalare Cuv. & Val. (Cichlidae, Teleostei). Histological, transmission- and scanning electron microscopic studies.

    Science.gov (United States)

    Bennemann, R; Pietzsch-Rohrschneider, I

    1978-10-30

    The cement gland apparatus of newly hatched Pterophyllum scalare Cuv. & Val. was examined by histology, scanning and transmission electron microscopy. The whole organ is composed of three pairs of endoepithelial, ductless glands, which cause prominent elevations on the larval head and are found in a specific arrangement. Each single gland is represented by an aggregation of elongated, tubular secretory cells surrounding a pyriform acinus. It overlies a basal lamina and is covered by the outer layer of the bilaminar embryonic epidermis. Two different types of secretory cells can be distinguished. One type is restricted to the bottom of the cavity. It is characterized by multiform cytoplasmic protrusions, which project into the gland's cavity. The secretory granules contain a network of light filamentous material. The second type constitutes the side wall of the acinus. It does not develop any protrusions. The contents of the secretory granules is of very high and homogeneous electron density. The mechanism of extrusion is discussed for both cell types. All secretory cells show a strong PAS-reaction. In SEM a circular microridge pattern with attached mucus globules can be recognized on the larval epithelial surface. PMID:728956

  12. Phylogeny and biogeographic history of the cyprinid fish genus Carassius (Teleostei: Cyprinidae) with focus on natural and anthropogenic arrivals in Europe

    Czech Academy of Sciences Publication Activity Database

    Rylková, K.; Kalous, L.; Bohlen, Jörg; Lamatsch, D.K.; Petrtýl, M.

    2013-01-01

    Roč. 380, č. 383 (2013), s. 13-20. ISSN 0044-8486 R&D Projects: GA ČR GA206/09/1154 Institutional research plan: CEZ:AV0Z5045916 Institutional support: RVO:67985904 Keywords : Carassius auratus complex * Cytochrome b * Distribution Subject RIV: EB - Genetics ; Molecular Biology Impact factor: 1.828, year: 2013

  13. Population structure and reproduction of Deuterodon langei travassos, 1957 (Teleostei, Characidae in a neotropical stream basin from the Atlantic Forest, Southern Brazil

    Directory of Open Access Journals (Sweden)

    Jean Ricardo Simões Vitule

    2008-12-01

    Full Text Available Aspects of the biology of D. langei were studied at different sites along a longitudinal gradient formed by the Ribeirão stream basin, a Neotropical stream of the Atlantic Forest, southern Brazil. Differences were observed in population structure and reproduction along the longitudinal gradient and during the study period. Juvenile fishes occurred in high abundance, mainly in the downstream site after the rainy months. Adults occurred mainly in the intermediate and upstream sites. During their life cycle, adults optimise their reproductive strategy by concentrating the reproductive period with total spawn in a short time interval before summer rains dragged the juvenile, larval forms and/or eggs downstream. The downstream site was characterized by a wide range of microhabitats (ex. submerged grass and shallow flooded area. Thus, the species used different portions of the basin in distinct stages of its life, being ecologically adapted to variation patterns in its temporal and physical environments.Aspectos da biologia de D. langei foram estudados em diferentes locais da bacia do rio Ribeirão, um riacho litorâneo da Floresta Atlântica do sudeste do Brasil. Foram observadas diferenças na estrutura da população e na reprodução, ao longo do gradiente longitudinal da bacia e do período de estudo. Os peixes juvenis ocorreram em grande abundância, principalmente no trecho a jusante da bacia, após os meses mais chuvosos. Adultos ocorreram principalmente nos trechos intermediários e a montante. Não houve diferença significativa na relação sexual entre os locais amostrados, estações do ano, meses e classes de comprimento. O comprimento médio de primeira maturação (L50 foi o mesmo para machos e fêmeas, entre 6,1 e 7,0 cm de comprimento total (Lt. O período reprodutivo foi curto (entre o final da primavera e início do verão, antes dos meses mais chuvosos, com desova total. O Índice de Atividade Reprodutiva (IAR indicou que D. langei reproduz em toda a bacia, porém a atividade reprodutiva é mais intensa nos trechos mais a montante da bacia. O período chuvoso e as chuvas torrenciais se mostraram fatores abióticos muito importantes para a dinâmica da população. Durante seu ciclo de vida os adultos maximizam sua estratégia reprodutiva concentrando o período reprodutivo, com desova total em um curto espaço de tempo antes das chuvas de verão que carregam juvenis, formas larvais e/ou ovos para as regiões a jusante onde existe uma ampla quantidade de micro-ambientes (gramíneas submersas e áreas rasas e calmas. Desta forma a espécie estudada utilizou diferentes porções da bacia em distintos estágios de seu ciclo de vida, demonstrando estar ecologicamente adaptada às variações temporais e físicas do ambiente.

  14. Influence of spawning procedure on gametes fertilization success in Salminus hilarii Valenciennes, 1850 (Teleostei: Characidae): Implications for the conservation of this species

    OpenAIRE

    Renato M. Honji; Paulo H. Mello; Bruno C. Araújo; Jandyr A. Rodrigues-Filho; Alexandre W. S. Hilsdorf; Moreira, Renata G.

    2011-01-01

    Artificial reproduction and gamete fertilization were evaluated in Salminus hilarii wild and domesticated broodstocks. Wild and domesticated broodstocks were artificially induced to reproduction using a carp pituitary treatment. Four groups were considered: Group 1 (G1), fish caught in the wild maintained for three years in the same conditions as the domesticated broodstocks and spawned naturally; Group 2 (G2), broodstock born and raised in captivity and spawned naturally; Group 3 (G3), wild ...

  15. Influence of spawning procedure on gametes fertilization success in Salminus hilarii Valenciennes, 1850 (Teleostei: Characidae: Implications for the conservation of this species

    Directory of Open Access Journals (Sweden)

    Renato M. Honji

    2011-06-01

    Full Text Available Artificial reproduction and gamete fertilization were evaluated in Salminus hilarii wild and domesticated broodstocks. Wild and domesticated broodstocks were artificially induced to reproduction using a carp pituitary treatment. Four groups were considered: Group 1 (G1, fish caught in the wild maintained for three years in the same conditions as the domesticated broodstocks and spawned naturally; Group 2 (G2, broodstock born and raised in captivity and spawned naturally; Group 3 (G3, wild broodstocks, which were manually stripped for gamete collection and dry fertilization; and Group 4 (G4, domesticated males and females, also manually stripped. Oocytes, eggs, and larvae were sampled at different time intervals throughout embryonic development. Yolk sac absorption occurred approximately 24-29 h after hatching. Twenty-six h after hatching, the larvae mouths opened. Cannibalism was identified just 28-30 h after hatching. There was no morphological difference in embryonic development among all groups. The number of released eggs per gram of female was: G1: 83.3 ± 24.5 and G2: 103.8 ± 37.4; however, the fertilization success was lower in G2 (42.0 ± 6.37 % compared with G1 (54.7 ± 3.02% (P = 0.011. Hand-stripping of oocytes was not successful and the fertilization rate was zero. The reproduction of this species in captivity is viable, but it is necessary to improve broodstock management to enhance fertilization rates and obtain better fingerling production for restocking programs.A reprodução artificial e fertilização dos gametas foram avaliados em reprodutores selvagens e de cativeiro de Salminus hilarii. Reprodutores selvagens e de cativeiro foram induzidos artificialmente à reprodução utilizando hipófise de carpa. Quatros grupos foram considerados: Grupo 1 (G1, peixes capturados na natureza, mantidos por três anos nas mesmas condições de reprodutores de cativeiro e desovados naturalmente; Grupo 2 (G2, reprodutores nascidos e criados em cativeiro e desovados naturalmente; Grupo 3 (G3, reprodutores selvagens que foram extrusados manualmente para a coleta de gametas e fertilização a seco; e Grupo 4 (G4, com machos e fêmeas domesticadas, também extrusados manualmente. Oócitos, ovos e larvas foram amostrados em diferentes intervalos de tempo ao longo do desenvolvimento embrionário. A absorção do saco vitelínico ocorreu aproximadamente 24-29 h após a eclosão. Vinte e seis h após a eclosão, as larvas abriram a boca. O canibalismo foi identificado apenas 28-30 h após a eclosão. Não houve diferença morfológica no desenvolvimento embrionário entre todos os grupos. O número de ovos liberados por grama de fêmea foi: G1: 83,3 ± 24,5 e G2: 103,8 ± 37,4; embora, o sucesso na fertilização tenha sido menor no G2 (42,0 ± 6,37% em comparação com G1 (54,7 ± 3,02% (P = 0,011. A extrusão manual dos oócitos não foi bem sucedida e a taxa de fertilização foi zero. A reprodução em cativeiro desta espécie é viável, mas é necessário um melhor manejo dos reprodutores para aumentar as taxas de fertilização, visando a obtenção de uma melhor produção de alevinos para os programas de repovoamento.

  16. Composition and properties of the soluble organic matrix of the otolith of a marine fish: Gadus morhua Linne, 1758 (Teleostei, Gadidae).

    Science.gov (United States)

    Dauphin, Y; Dufour, E

    2003-03-01

    The soluble matrix of the sagittal otolith of the cod Gadus morhua was analyzed using UV and IR spectroscopy, liquid chromatography and electrophoresis. This matrix is a complex mixture of proteins and glycoproteins, with a large range of molecular weights. High weights (>1000 kDa) are shown for the first time in water-soluble matrix of otolith. However, the 2D denaturing electrophoresis and large range of sorting used in high performance liquid chromatography columns do not separate the soluble matrix to well-defined molecular weights. The IR data indicate that several conformations are present and the main part of the sugars is not sulfated. Additionally, electrophoresis data show that the acidity of the sugar components is higher than that of the proteins. Despite the relative scarcity of literature data, our study of G. morhua suggests that the chemical composition of otolith soluble organic matrix may differ among species. PMID:12600664

  17. †Kenyaichthyidae fam. nov. and †Kenyaichthys gen. nov. – First Record of a Fossil Aplocheiloid Killifish (Teleostei, Cyprinodontiformes)

    Science.gov (United States)

    Altner, Melanie; Reichenbacher, Bettina

    2015-01-01

    The extant Cyprinodontiformes (killifishes) with their two suborders Cyprinodontoidei and Aplocheiloidei represent a diverse and well-studied group of fishes. However, their fossil record is comparatively sparse and has so far yielded members of the Cyprinodontoidei only. Here we report on cyprinodontiform fossils from the upper Miocene Lukeino Formation in the Tugen Hills of the Central Rift Valley of Kenya, which represent the first fossil record of an aplocheiloid killifish. A total of 169 specimens - mostly extraordinarily well preserved - and a sample of ten extant cyprinodontiform species were studied on the basis of morphometrics, meristics and osteology. A phylogenetic analysis using PAUP was also conducted for the fossils. Both the osteological data and the phylogenetic analysis provide strong evidence for the assignment of the fossils to the Aplocheiloidei, and justify the definition of the new family †Kenyaichthyidae, the new genus †Kenyaichthys and the new species †K. kipkechi sp. nov. The phylogenetic analysis unexpectedly places †Kenyaichthys gen. nov. in a sister relationship to the Rivulidae (a purely Neotropical group), a probable explanation might be lack of available synapomorphies for the Rivulidae, Nothobranchiidae and Aplocheilidae. The specimens of †K. kipkechi sp. nov. show several polymorphic characters and large overlap in meristic traits, which justifies their interpretation as a species flock in statu nascendi. Patterns of variation in neural and haemal spine dimensions in the caudal vertebrae of †Kenyaichthys gen. nov. and the extant species studied indicate that some previously suggested synapomorphies of the Cyprinodontoidei and Aplocheiloidei need to be revised. PMID:25923654

  18. †Kenyaichthyidae fam. nov. and †Kenyaichthys gen. nov. – First Record of a Fossil Aplocheiloid Killifish (Teleostei, Cyprinodontiformes)

    OpenAIRE

    Altner, Melanie; Reichenbacher, Bettina

    2015-01-01

    The extant Cyprinodontiformes (killifishes) with their two suborders Cyprinodontoidei and Aplocheiloidei represent a diverse and well-studied group of fishes. However, their fossil record is comparatively sparse and has so far yielded members of the Cyprinodontoidei only. Here we report on cyprinodontiform fossils from the upper Miocene Lukeino Formation in the Tugen Hills of the Central Rift Valley of Kenya, which represent the first fossil record of an aplocheiloid killifish. A total of 169...

  19. Absence of the intron-D-exon of c-Ha-ras oncogene in the hermaphroditic fish Rivulus marmoratus (Teleostei: Rivulidae).

    Science.gov (United States)

    Lee, J S; Choe, J; Park, E H

    1994-11-01

    We have cloned ras genes from the hermaphroditic fish Rivulus marmoratus genomic library by screening about 3.0 x 10(5) genomic clones. When one out of 19 ras genomic clones was sequenced, it showed 95.8% amino acid homology to the human c-Ha-ras gene and was named the Rivulus c-Ha-ras gene. The Rivulus c-Ha-ras gene spanned about 3.7 kb and consisted of four exons encoding 189 amino acids. The exon-intron boundaries also coincided with the rule of GT/AG of consensus splice acceptor and donor sequences. The Rivulus c-Ha-ras gene does not, however, have the intron-D-exon (IDX) that has been reported to exist between the third and the fourth exon of the mammalian c-Ha-ras genes, and which is involved in negative control of p21 c-Ha-ras expression and transforming activity of this gene. This is the first report on the structure of the fish c-Ha-ras gene. PMID:7703908

  20. Anticipation of Artemia sp. supply in the larviculture of the barber goby Elacatinus figaro (Gobiidae: Teleostei influenced growth, metamorphosis and alkaline protease activity

    Directory of Open Access Journals (Sweden)

    Maria Fernanda da Silva-Souza

    2015-09-01

    Full Text Available The barber goby Elacatinus figaro is considered endangered due to overexploitation by the ornamental industry. Farming marine ornamental fishes, especially the threatened ones, can be one of the measures to minimize the pressure on the natural stocks. Among the priority issues for their production is the determination of the most appropriate feeding management. The feeding protocol commonly used in the larviculture of barber goby, when the start of Artemia sp. offer occurred at the 18th DAH (days after hatching (treatment T18, was modified, by anticipating brine shrimp supply in 6 days (treatment T12. Alkaline proteases activity, growth and metamorphosis of larvae were evaluated in both protocols. Juveniles at T12 showed higher weight (0.04 ± 0.001 g and lower activity of total alkaline proteases (1.3 ± 0.2 mU mg-1 protein compared to T18 (0.02 ± 0.001 g; 2.8 ± 0.4 mU mg-1 protein, respectively. With anticipation of brine shrimp, the commencing and end of larval transformation was observed earlier (at 24 and 34 DAH, respectively in comparison to those with the supply of Artemia sp. at 18 DAH (27 and 41 DAH, respectively. Thus, the Artemia sp. anticipation was beneficial during the larviculture of the barber goby, considering that larvae reached metamorphosis earlier.

  1. Aspects of the biology of the Atlantic Midshipman, Porichthys porosissimus (Teleostei, Batrachoididae: an important by-catch species of shrimp trawling off southern Brazil

    Directory of Open Access Journals (Sweden)

    Marcelo Vianna

    2000-01-01

    Full Text Available Trawl fishing for pink shrimp (Farfantepenaeus brasiliensis and F. paulensis catches large quantities of by-catch fish, discarded due to their having no commercial vaue. As these species have rarely been studied, the impact of fisheries on these populations is not known. This contribution studies the biology of a species of no commercial value, the Atlantic midshipman Porichthys porosissimus. The last haul /Tom a commercial trawler, operating on the northern coast of São Paulo State and the southern coast of Rio de Janeiro State, was preserved (/Tom being discarded and identified at the species leveI. It was observed that this fishery affects the juvenile population which is intluenced by the seasonal variation of the water masses. Growth parameters were estimated: L∞ = 37.0 cm, K = 0.285 year-1. Instantaneous mortality coefficients were estimated: 2=2.14, M=0.63, F= 1.51, S= 11.8 and E=0.71. Considering the intensive activity of the shrimp trawl tleet operating in this area, the deleterious action of trawling is considered as of high impact. The stock management measures applied for pink shrimp are without effect regarding P. porosissimus. which has its spawning period before the closed season and its recruitment peak after it. The results show overfishing and the need to apply measures to reduce trawling action, such as adequate policies, introduction of selectivity devices and the creation of exclusion zones for trawl fishing.A pesca de arrasto para a captura do camarão-rosa (Fm:fantepenaeus brasi/iensis e F. paulensis captura grande quantidade de peixes considerados fauna acompanhante que são descartados por não possuírem valor comercial. Assim, pouco aparecem em trabalhos de biologia pesqueira com dados de desembarque, sendo a ação pesqueira sobre estas populações pouco conhecida. Neste estudo, um arrasto mensal de um barco de pesca foi desembarcado sem que nada do material capturado fosse descartado. Analisou-se Porichthys porosissimus do qual foram avaliados aspectos biológicos e pesqueiros. Estimou-se, para a espécie: L∞ = 37,0 cm, K = 0,285 ano.l, Rn=180 (x 10-3, 2=2,14, M=0,63, F=1,51, S=11,8 e E=0.71. Embora não intencional, a pesca age principalmente em jovens e ocorre durante o ano todo, sendo intluenciada pela sazonal idade das massas d'água. Considerando a frota operante na área, o efeito do arrasto é considerável, já que a taxa de aproveitamento é nula. As medidas de proteção de estoque aplicadas ao camarão-rosa não são efetivas para P. porosissimus, que apresenta o período de desova anterior à época do defeso e o pico de recrutamento pesqueiro posterior. Os resultados indicam sobrepesca da população estudada sendo necessário medidas de modo a diminuir a ação deletéria do arrasto, como a adequação da legislação, uso de dispositivos de seletividade e a criação de zonas de exclusão de arrasto.

  2. Karyotype differentiation in 19 species of river loach fishes (Nemacheilidae, Teleostei): extensive variability associated with rDNA and heterochromatin distribution and its phylogenetic and ecological interpretation

    Czech Academy of Sciences Publication Activity Database

    Sember, Alexandr; Bohlen, Jörg; Šlechtová, Vendula; Altmanová, M.; Symonová, Radka; Ráb, Petr

    2015-01-01

    Roč. 15, č. 251 (2015). ISSN 1471-2148 R&D Projects: GA ČR GA206/08/0637 Institutional support: RVO:67985904 Keywords : fish cytotaxonomy * karyotype variability vs. 2n uniformity * FISH Subject RIV: EB - Genetics ; Molecular Biology Impact factor: 3.368, year: 2014

  3. Distinguishing between Incomplete Lineage Sorting and Genomic Introgressions: Complete Fixation of Allospecific Mitochondrial DNA in a Sexually Reproducing Fish (Cobitis; Teleostei), despite Clonal Reproduction of Hybrids

    Czech Academy of Sciences Publication Activity Database

    Choleva, Lukáš; Musilová, Zuzana; Kohoutová-Šedivá, Alena; Pačes, Jan; Ráb, Petr; Janko, Karel

    2014-01-01

    Roč. 9, č. 6 (2014), e80641-e80641. E-ISSN 1932-6203 R&D Projects: GA ČR GAP506/10/1155; GA ČR GPP506/12/P857 Institutional support: RVO:67985904 Keywords : Cobitis * gene flow * coalescence * incomplete lineage sorting * asexual * gynogenesis Subject RIV: EG - Zoology Impact factor: 3.234, year: 2014 http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0080641

  4. Description of karyotype in Hypostomus regani (Ihering, 1905) (Teleostei, oricariidae) from the Piumhi river in Brazil with comments on karyotype variation found in Hypostomus

    OpenAIRE

    Ernani de Oliveira Mendes-Neto; Marcelo Ricardo Vicari; Roberto Artoni; Orlando Moreira-Filho

    2011-01-01

    The paper represents a comparative cytogenetic analysis of three populations of Hypostomus regani in Brazil. Two populations belong to the Upper Paraná River Basin and the third one, the karyotype of which is described for the first time, was probably introduced into the São Francisco River Basin through transposition from the Piumhi River. Karyotype features of populations of H. regani from the Piracicaba and Tietê River Basins are also discussed. The occurrence of H. reg...

  5. Chromosomal differentiation between populations of Oligosarcus hepsetus (Teleostei, Characidae from small tributaries at opposite margins of the Paraíba do Sul river (Brazil

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    Liano Centofante

    2006-11-01

    Full Text Available Cytogenetic analyses were carried out in two populations of Oligosarcus hepsetus from tributaries at opposite margins of the Paraíba do Sul river. The same diploid number was observed in both populations (2n=50, but they showed remarkable differences related to karyotype formula and distribution of rDNA sites as revealed by silver nitrate staining and in situ hybridization with 18S probes. The results suggested that the main channel of the Paraíba do Sul river acted as barrier to gene flow between populations.Análises citogenéticas foram realizadas em duas populações de Oligosarcus hepsetus provenientes de riachos de margens opostas do rio Paraíba do Sul. O número diplóide foi o mesmo para ambas as populações (2n=50, porém diferenças significativas foram observadas com relação à fórmula cariotípica e distribuição dos sítios de DNAr detectados pela impregnação por prata e pela hibridação "in situ" com sonda 18S. Estes resultados sugerem que a calha principal do rio Paraíba do Sul estaria atuando como uma barreira para o fluxo gênico entre essas populações.

  6. Karyotypic diversity in four species of the genus Gymnotus Linnaeus, 1758 (Teleostei, Gymnotiformes, Gymnotidae: physical mapping of ribosomal genes and telomeric sequences

    Directory of Open Access Journals (Sweden)

    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 karyotype differentiation and the interrelationships among different species of the genus Gymnotus.

  7. Karyotype, C-banding and AgNORs of two endemic leuciscine fish, Pseudophoxinus crassus (Ladiges, 1960) and P. hittitorum Freyhof & Özulug, 2010 ( Teleostei , Cyprinidae )

    OpenAIRE

    Sevgi Unal; Muhammet Gaffaroglu; Muradiye Karasu Ayata; Esref Yüksel

    2014-01-01

    Abstract The genus Pseudophoxinus Bleeker, 1860 is found in a wide range of habitats in central Anatolia, but it is not well known from a cytogenetic aspect. In this study the first karyotypic description of the spring minnows Pseudophoxinus crassus (Ladiges, 1960) and Pseudophoxinus hittitorum Freyhof & Özulug, 2010 by means of conventional methods (Giemsa staining, C-banding, silver nitrate impregnation (Ag-NORs)) was performed. Both species are endemic and have restricted distributions in ...

  8. A multi-approach analysis of the genetic diversity in populations of Astyanax aff. bimaculatus Linnaeus, 1758 (Teleostei: Characidae from Northeastern Brazil

    Directory of Open Access Journals (Sweden)

    Vanessa de Carvalho Cayres Pamponet

    2008-12-01

    Full Text Available Few reports are available about the ichthyofauna of typical semi-arid rivers, although the regional diversity has been constantly threatened by human activities, mainly related to impoundment and construction of dams. The goal of the present work was to evaluate using different methods, the population genetic structure of a characin fish, Astyanax aff. bimaculatus, widespread throughout hydrographic basins of Bahia, Northeastern Brazil. Morphological (meristic and morphometric data, cytogenetic (karyotype and Ag-NOR, and molecular (RAPD and SPAR analyses were carried out in specimens collected upstream and downstream of Pedra Dam, in the main channel of Contas River (Contas River Basin, and in the Mineiro stream, which belongs to the adjacent Recôncavo Sul basin. Few external differences were detected among populations, where the individuals collected upstream of Pedra Dam were slightly larger than the others. Cytogenetic data also showed a similar karyotypic pattern (2n=50; 6m+28sm+12st+4a; FN= 96 and NORs located on the short arms of up to two chromosome pairs, with numerical inter- and intra-populational variation. Nonetheless, RAPD and SPAR analyses differentiated reliably the three populations, revealing striking differences in the allele frequencies among the localities studied and a significant difference in population structure index (Fst=0.1868, PPoucos estudos ictiofaunísticos estão disponíveis em rios típicos do semi-árido, apesar da constante ameaça à diversidade local devido a influências antrópicas, com destaque para o represamento e construção de barragens. O presente trabalho teve como objetivo avaliar, por meio de diferentes metodologias, a estrutura genética de populações de uma espécie de caracídeo, Astyanax aff. bimaculatus, amplamente distribuída em bacias hidrográficas da Bahia, Nordeste do Brasil. Análises morfológicas (dados merísticos e morfométricos, citogenéticas (cariótipo e Ag-RONs e moleculares (RAPD e SPAR foram realizadas em espécimes coletados à montante e à jusante da Barragem da Pedra, na calha principal do médio rio de Contas (bacia do Rio de Contas e no ribeirão Mineiro, pertencente à bacia adjacente do Recôncavo Sul. Poucas diferenças externas foram detectadas entre as populações, sendo os indivíduos originários do reservatório, à montante da barragem, ligeiramente maiores. Os dados citogenéticos também mostraram padrões cariotípicos semelhantes (2n=50; 6m+28sm+12st+4a; FN= 96 e RONs situadas nos braços curtos de até dois pares cromossômicos, com variação numérica inter- e intra-populacional. Contudo, as análises por RAPD e SPAR diferenciaram as três populações de forma eficiente, revelando freqüências alélicas significativamente diferentes entre as localidades amostradas e índices significativos de estruturação populacional (Fst=0.1868, P<0.0001. As diferenças entre populações do mesmo rio foram tão significativas quanto entre bacias hidrográficas distintas, indicando que a represa constitui uma barreira eficiente ao fluxo gênico. Além disso, acredita-se que peculiaridades ambientais de cada localidade possam também influenciar os padrões genéticos encontrados. Por outro lado, a similaridade entre amostras das bacias do Rio de Contas e Recôncavo Sul pode estar relacionada a uma história evolutiva comum, já que ambas estão geograficamente próximas. Por fim, o presente estudo demonstra que a realização de estudos envolvendo diferentes marcadores é extremamente útil para a identificação de estruturas de populações em espécies amplamente distribuídas e para avaliação dos impactos das atividades humanas sobre as populações naturais de peixes.

  9. Screening and characterization of sex-specific DNA fragments in the freshwater fish matrinchã, Brycon amazonicus (Teleostei: Characiformes: Characidae).

    Science.gov (United States)

    da Silva, Eder Marques; Wong, Marina Sek Lien; Martins, Cesar; Wasko, Adriane Pinto

    2012-10-01

    The matrinchã Brycon amazonicus, a commercially important freshwater fish resource, has no heteromorphic sex chromosomes so far described. In the present study, we performed a screening of sex-associated DNA markers in this species, through the use of a random amplified polymorphic DNA (RAPD) assay and a genomic DNA restriction digestion analysis. DNA digestions evidenced no differences between sexes. Sixty-six random primers were used in pooled and individual DNA samples of males and females, and the analysis of the RAPD fingerprints revealed one female sex-associated band. Cloning and sequencing of this band led to the identification of two distinct DNA segments. While one of the isolated fragments showed a significant identity with a described protein gene (phosphatidylinositol glycan anchor biosynthesis, class W), the other fragment, composed of 535 bp, corresponds to a novel DNA marker. Further experiments were performed with this second DNA fragment in order to verify its sex-specificity. Data on dot blot hybridization, using total DNA of both sexes, confirmed its female-specificity in B. amazonicus. A primer set was designed based on its sequence data and used in PCR with DNA samples of this species, leading to diagnose the animals' sexes with a 100 % overall accuracy through a sequence characterized amplified region approach. No amplification results were found for two other species of the genus--B. orbignyanus and B. lundii. The obtained data can lead to the hypothesis that B. amazonicus may present heteromorphic sex chromosomes that should be in an early phase of differentiation. PMID:22527611

  10. A multi-approach analysis of the genetic diversity in populations of Astyanax aff. bimaculatus Linnaeus, 1758 (Teleostei: Characidae) from Northeastern Brazil

    OpenAIRE

    Vanessa de Carvalho Cayres Pamponet; Paulo Luiz Souza Carneiro; Paulo Roberto Antunes de Mello Affonso; Viviam Souto Miranda; Juvenal Cordeiro Silva Júnior; Claudine Gonçalves de Oliveira; Fernanda Amato Gaiotto

    2008-01-01

    Few reports are available about the ichthyofauna of typical semi-arid rivers, although the regional diversity has been constantly threatened by human activities, mainly related to impoundment and construction of dams. The goal of the present work was to evaluate using different methods, the population genetic structure of a characin fish, Astyanax aff. bimaculatus, widespread throughout hydrographic basins of Bahia, Northeastern Brazil. Morphological (meristic and morphometric data), cytogene...

  11. The gynogenetic reproduction of diploid and triploid hybrid spined loaches (Cobitis: Teleostei), and their ability to establish successful clonal lineages - on the evolution of polyploidy in asexual vertebrates

    Czech Academy of Sciences Publication Activity Database

    Janko, Karel; Bohlen, Jörg; Lamatsch, D.; Flajšhans, Martin; Epplen, J. T.; Ráb, Petr; Kotlík, Petr; Šlechtová, Věra

    2007-01-01

    Roč. 131, - (2007), s. 185-194. ISSN 0016-6707 R&D Projects: GA ČR GP206/05/P586 Grant ostatní: EU Marie Curie Research amd Training Network(EU) MCRTN-CT-2004-512492; German Research Foundation(DE) SFB 567 Institutional research plan: CEZ:AV0Z50450515 Keywords : asexual reproduction * evolution of polyploidy * hybridisation Subject RIV: EB - Genetics ; Molecular Biology Impact factor: 1.396, year: 2007

  12. Sobre la presencia de un Sciaenidae (Teleostei: Perciformes) en el “Belgranense” (= Fm. Pascua, Pleistoceno superior) de Centinela del Mar, Buenos Aires (Argentina)

    OpenAIRE

    Bogan, Sergio; Marcos M. Cenizo

    2008-01-01

    [EN] The objective of the present communication is to report the presence of an otolith (sagitta) referable to a whitemouth croaker, Micropogonias furnieri. This material proceeds from estuarine strata corresponding to the marine transgression “Belgranense” (Upper Pleistocene) of the locality of Centinela del Mar, province of Buenos Aires, Argentina. The otolith has a prominent protuberance at the external tip, character that nowadays is related to the southernmost population of the species t...

  13. Population Structure, Genetic Diversity, Effective Population Size, Demographic History and Regional Connectivity Patterns of the Endangered Dusky Grouper, Epinephelus marginatus (Teleostei: Serranidae, within Malta's Fisheries Management Zone.

    Directory of Open Access Journals (Sweden)

    Molly Buchholz-Sørensen

    Full Text Available The objective of this study is to describe the genetic population structure and demographic history of the endangered marine fish, Epinephelus marginatus, within Malta's Fisheries Management Zone for the purpose of localised conservation planning. Epinephelus marginatus is a long-lived, sedentary, reef-associated protogynous hermaphrodite with high commercial and recreational value that is at risk of extinction throughout its global distribution. Based on global trends, population substructuring and gaps in local knowledge this has led to an increased interest in evaluation of local stock. Assessment of Maltese demography was based on historical and contemporary catch landings data whilst genetic population structure and regional connectivity patterns were evaluated by examining 175 individuals collected within the central Mediterranean region between 2002 and 2009 using 14 nuclear microsatellite loci. Demographic stock assessment of Maltese E. marginatus' revealed a 99% decline in catch landings between 1947 and 2009 within the Fisheries Management Zone. A contemporary modest mean size was observed, 3 ± 3 kg, where approximately 17% of the population was juvenile, 68% female/sex-changing and 15% were male with a male-to-female sex ratio of 1:5. Genetic analysis describes the overall population of E. marginatus' within the Fisheries Management Zone as decreasing in size (ƟH = 2.2, which has gone through a significant size reduction in the past (M = 0.41 and consequently shows signs of moderate inbreeding (FIS = 0.10, p < 0.001 with an estimated effective population size of 130 individuals. Results of spatially explicit Bayesian genetic cluster analysis detected two geographically distinct subpopulations within Malta's Fisheries Management Zone and that they are connected to a larger network of E. marginatus' within the Sicily Channel. Results suggest conservation management should be designed to reflect E. marginatus' within Malta's Fisheries Management Zone as two management units.

  14. Estimation de l'âge individuel de Prochilodus nigricans (Teleostei, Prochilodae) dans le Béni (Bolivie) : protocole d'étude et application

    OpenAIRE

    Loubens, Gérard; Panfili, Jacques

    1992-01-01

    L'estimation de l'âge de #Prochilodus nigricans$ Agassiz, 1829 est réalisée à partir de 840 poissons pêchés de 1983 à 1987 dans les principaux milieux du réseau hydrographique de la rivière Mamoré (Béni, Bolivie). Diverses préparations et observations de pièces calcifiées (écailles, otolithes, rayon épineux dorsal et os operculaire), ainsi que les comparaisons de plusieurs lectures, ont permis de choisir l'écaille et ses marques de croissance pour estimer l'âge. Les pertes d'écailles, entraîn...

  15. Morphology, ultrastructure and phylogeny of Myxobolus curimatae n. sp. (Myxozoa: Myxosporea) a parasite of Prochilodus costatus (Teleostei: Prochilodontidae) from the São Francisco River, Brazil.

    Science.gov (United States)

    Zatti, Suellen A; Naldoni, Juliana; Silva, Márcia R M; Maia, Antônio A M; Adriano, Edson A

    2015-10-01

    Myxobolus curimatae n. sp. has been found infecting the gill filaments of Prochilodus costatus (Prochilodontidae) from the São Francisco River in the state of Minas Gerais, Brazil. The prevalence of the species was 18.7%. Mature spores were rounded from a frontal view, with elongated polar capsules of equal size, and had polar filaments with 9-10 turns. Ultrastructural analysis revealed that sporogenesis patterns followed those of other Myxobolus species. The plasmodium walls had numerous invaginations and protrusions, and few pinocytic channels. Numerous mitochondria, generative cells and young pansporoblasts were observed in the peripherical areas of the plasmodia, and mature spores were found in deeper layers. A layer of collagenic fibrils surrounded the plasmodia. The morphological data and molecular analysis of the 18S rDNA identified this parasite as a new species. The maximum likelihood phylogenetic tree showed M. curimatae n. sp., as a sister species of Thelohanellus marginatus, in a basal branch of the subclade composed by parasites with tropism to different organs and host families. PMID:26002517

  16. Phylogenetic analyses of the subgenus Mollienesia (Poecilia, Poeciliidae, Teleostei) reveal taxonomic inconsistencies, cryptic biodiversity, and spatio-temporal aspects of diversification in Middle America.

    Science.gov (United States)

    Palacios, Maura; Voelker, Gary; Arias Rodriguez, Lenin; Mateos, Mariana; Tobler, Michael

    2016-10-01

    The subgenus Mollienesia is a diverse group of freshwater fishes, including species that have served as important models across multiple biological disciplines. Nonetheless, the taxonomic history of this group has been conflictive and convoluted, in part because the evolutionary relationships have not been rigorously resolved. We conducted a comprehensive molecular phylogenetic analysis of the subgenus Mollienesia to identify taxonomic discrepancies and potentially identify undescribed species, estimate ancestral areas of origin and estimate dates of divergence, as well as explore biogeographical patterns. Our findings confirm the presence of three main clades composed of the P. latipinna, P. sphenops, and P. mexicana species complexes. Unlike previously hypothesized morphology-based analyses, species found on the Caribbean Islands are not part of Mollienesia, but are more closely related to species of the subgenus Limia. Our study also revealed several taxonomic inconsistencies and distinct lineages in the P. mexicana species complex that may represent undescribed species. The diversity in the subgenus Mollienesia is a result of dynamic geologic activity leading to vicariant events, dispersal across geologic blocks, and ecological speciation. PMID:27472959

  17. Three new species of Protogyrodactylus Johnston & Tiegs, 1922 (Monogenoidea: Dactylogyridae) from the gills of the longtail silverbiddy Gerres longirostris (Teleostei: Gerreidae) in the Red Sea.

    Science.gov (United States)

    Galli, Paolo; Kritsky, Delane C

    2008-03-01

    Twenty-one specimens of the longtailed silverbiddy Gerres longirostris (Gerreidae) were examined for dactylogyrid parasites from the Nabq Managed Resource Protected Area, Ras Mohammed National Park (Red Sea) near Sharm El-Sheikh, South Sinai, Egypt. The diagnosis of Protogyrodactylus Johnston & Tiegs, 1922 was amended, and three new species, P. federicae n. sp., P. zullinii n. sp. and P. alatus n. sp., were recovered and described; the prevalence of each species was 100%. P. federicae most closely resembled P. alienus Bychowsky & Nagibina, 1974, but differed from it by possessing two anteromedial projections on the ventral bar, a claw-like ventral anchor sclerite and spatulate dorsal bars. P. zullini was most similar to P. quadratus Johnston & Tiegs, 1922, from which it differed by having a distal hook on the superficial root of the dorsal anchor, an evenly curved ventral anchor shaft and point, and a flange on the bulbous base of the male copulatory organ. P. alatus was closest to P. youngi Bychowsky & Nagibina, 1974, from which it differed by having delicate anchors and two prominent anteromedial processes on the ventral bar. PMID:18210221

  18. Revision of Allobenedenia Yamaguti, 1963 (Monogenoidea: Capsalidae) with the description of A. zhangi n. sp. from Epinephelus fasciatus (Teleostei: Serranidae) in the South China Sea.

    Science.gov (United States)

    Tingbao, Yang; Kritsky, Delane C; Yuan, Sun

    2004-11-01

    Allobenedenia Yamaguti, 1963 is revised to include capsalid species with five radial septa in the haptor. Megalocotyloides Bychowsky & Nagibina, 1967 and Allosprostonia Lawler & Hargis, 1968 are considered junior synonyms of Allobenedenia. Eight described species comprise the genus: A. convoluta (Yamaguti, 1937) Yamaguti, 1963 (type-species), A. epinepheli (Bychowsky & Nagibina, 1967) n. comb., A. patagonica (Evdokimova, 1969) n. comb., A. pedunculata Raju & Rao, 1980, A. pseudomarginata (Bravo-Hollis, 1958) n. comb., A. sebastodi (Egorova, 1994) n. comb., A. yamagutii (Egorova, 1994) n. comb. and A. zhangi n. sp. A. ishikawae (Goto, 1894) Yamaguti, 1963 is considered a species inquirenda; Megalocotyloides hongkongensis Wu, Lu & Woo, 2002 is placed in synonymy with A. yamagutii; M. grandiloba (Paperna & Kohn, 1964) Egorova & Aleshkina, 1984 is provisionally returned to Megalocotyle as M. grandiloba Paperna & Kohn, 1964; and specimens identified as M. grandiloba from Serranus cabrilla (Serranidae) by Buhrnheim et al. (1973) are considered an undescribed species of Allobenedenia. A. zhangi n. sp. is described from the external surface of Epinephelus fasciatus (Serranidae) of Allobenedenia. A. zhangi n. sp. is described from the external surface of Epinephelus fasciatus (Serranidae) in the South China Sea and is characterised by having an elongtate proximally uncoiled male copulatory organ extending to near the level of the anterior margin of the ovary, a large prostatic reservoir apparently external to the male copulatory canal, and a submedial protuberance on the dorsal surface of the accessory sclerite of the haptor. PMID:15542951

  19. Monogenea of marine fishes from Hainan Island, China. VIII. Two new species of Euryhaliotrema Kritsky & Boeger, 2002 (Dactylogyridae) from Lutjanus argentimaculatus (Teleostei: Lutjanidae).

    Science.gov (United States)

    Jun, Pan; Jianying, Zhang

    2006-06-01

    This paper reports two new species of Euryhaliotrema Kritsky & Boeger, 2002 collected from the gills of Lutjanus argentimaculatus (Forsskål). E. xinyingense n. sp. is similar to Euryhaliotrema atlanticum Kritsky & Boeger, 2002 in the structure of copulatory apparatus, but differs from the latter in the shape of anchors and the structure of vagina. E. hainanense n. sp. also closely resembles E. atlanticum Kritsky & Boeger, 2002, but differs from the latter in the structure of haptor and the shape of accessory piece. PMID:16612651

  20. Morphometric and molecular characterisation of specimens of Lepidapedon Stafford, 1904 (Digenea: Lepidapedidae) from the deep-sea fish Mora moro (Risso) (Teleostei: Moridae) in the western Mediterranean

    Czech Academy of Sciences Publication Activity Database

    Dallarés, S.; Georgieva, Simona; Kostadinova, Aneta; Carrasson, M.; Gibson, D. I.; Pérez-del-Olmo, A.

    2013-01-01

    Roč. 85, č. 3 (2013), s. 243-253. ISSN 0165-5752 R&D Projects: GA ČR GAP505/10/1562; GA ČR GBP505/12/G112 Grant ostatní: GAJU(CZ) 04-135/2010/P Institutional support: RVO:60077344 Keywords : Northern Atlantic * Lepocrediidae Digenea * genus Subject RIV: EA - Cell Biology Impact factor: 1.035, year: 2013

  1. The Afro-Asian labeonine genus Garra Hamilton, 1822 (Teleostei, Cyprinidae) in the Pliocene of Central Armenia: Palaeoecological and palaeobiogeographical implications

    Science.gov (United States)

    Vasilyan, Davit; Carnevale, Giorgio

    2013-01-01

    Fossil skeletal remains of the Afro-Asian labeonine genus Garra are described on the basis of more than 300 specimens from the Pliocene diatomites of Jradzor, Central Armenia. Extant species of the genus Garra exhibit a wide distribution ranging from China, South Asia, and Borneo, through Middle East, the Arabian Peninsula, and Africa, where these fishes inhabit a variety of freshwater biotopes. The Pliocene fossils from the Jradzor site provide the first evidence of Garra in the fossil record. The inadequate preservation of the available material did not allow a detailed taxonomic attribution at the species level. Remains of Garra sp. were found associated to a moderately diverse assemblage, which includes also remains of additional freshwater fishes (Capoeta sp., Leuciscus cf. souffia, Leuciscus sp.), amphibians (Pelophylax cf. ridibundus), and large mammals (Rhinocerotidae indet.), as well as of monocotyledon plants. According to the diatom flora, the diatomites of Jradzor can be assigned to the Pliocene and were deposited in a freshwater lacustrine setting that was characterized by high productivity, eutrophic conditions, and standing macrophyte vegetation along the littoral zone. The presence of abundant resorptive pharyngeal teeth suggests that the Pliocene palaeolake of Jradzor was characterized by resident populations of Garra. Extant species of this genus are currently absent in the freshwaters of Armenia. The record of the genus Garra from Jradzor suggests that the Araks-Kura River drainage was connected, at least in part, with the Euphrates and Tigris River drainage during the Pliocene. The extinction of Garra (and other thermophilous taxa) from Araks and Kura River drainage was probably due to Plio-Pleistocene tectonic uplift of the Armenian Highland and consequent progressive climate cooling.

  2. Dynamics and cytochemistry of oogenesis in Leporinus striatus Kner (Teleostei, Characiformes, Anostomidae from the Rio Sapucaí, Minas Gerais State, Brazil

    Directory of Open Access Journals (Sweden)

    Helena A.S. Chini

    2001-12-01

    Full Text Available Oogenesis involves a sequense of transformations which are undergone by female germ cells. These cells change into oogonias and then into mature oocytes. Sexually mature females were collected monthly, during one year, from the Rio Sapucaí, tributary of the Rio Grande, which is part of the Furnas Reservoir system in the state of Minas Gerais. The observed material showed that oogonias were small spherical cells, had a big spherical nucleus, with a single nucleolus, and weakly stained cytoplasm with eosinophilic granules (FG stained, which indicate their protein content. The primary oocytes showed a big basophilic nucleus, with a large peripheral nucleolus, and several smaller nucleoli. They show a reduced cytoplasmic content. The previtellogenic oocytes presented voluminous cytoplasm and nucleus with several small peripheral nucleoli. The oocytes underwent vitellogenesis with the development of the zona radiata and the follicle cells. The zona radiata had two layers, the outer and the inner, which showed its protein content when stained with CM and FG techniques. TB pH 2.5 and pH 4.0 staining showed that oocytes undergoing vitellogenesis presented weakly stained cytoplasm and peripheral cytoplasmic vesicles. The follicle cells that were squamous became cuboidal. In mature oocytes, the yolk granules that filled the cytoplasm became green and blue when stained with FG and CM techniques, indicating their protein content. The perivitclline region showed rosy stained vesicles (TB pH 2.5 and pH 4.0 spread among the weakly stained peripheral vesicles, which seemed to be the cortical alveoli. The zona radiata cells, CM and FG stained, still showed two layers like the oocytes from the previous stage, but thicker.

  3. Induction of spawning in Capoeta aculeata, (Valenciennes in Cuv. & Val., 1844) (Teleostei, Cyprinidae), using carp pituitary extract

    OpenAIRE

    Reza Kamali-Far; Jamshid Amiri-Moghaddam; Fateme Maniei

    2009-01-01

    Capoeta aculeata is a benthopelagic fresh-water fish that lives in subtropical climates and has awidely distribution in Iranian river basins. Hatchery production of fish for stocking is an important means oftemporarily supplementing insufficient natural reproduction, thus help to maintain or restore eroded fishpopulation. This study was done in May and June 2007 on captured brood fish from Zayandeh-Rood River,Iran in order to reach a suitable technique of artificial reproduction of C. aculeat...

  4. Hepatocyte nuclear structure and subcellular distribution of copper in zebrafish Brachydanio rerio and roach Rutilus rutilus (Teleostei, Cyprinidae) exposed to copper sulphate

    International Nuclear Information System (INIS)

    Copper is a trace element essential to life, but also a heavy metal with toxic effect clearly demonstrated. Cu induced perturbations in fish liver are well documented but the variability of the reported results is large. In this study two cyprinids, zebrafish and roach, were exposed to copper. Reported histocytological changes are either adaptative or degenerative depending on fish species, concentration of metal, and duration of exposure. Hepatic subcellular distribution of copper was determined by X-ray microanalysis in control and Cu-exposed roach and zebrafish. Sublethal copper sulphate contamination induced the development of a particular nucleolar alteration forming a network or honeycomb like structure in liver. This perturbation is observable in almost all the hepatocytes of zebrafish and roach exposed to copper for a minimum of 4 days of exposure. It seemed to concern more precisely the pars fibrosa. X-ray microanalysis showed that the appearance of network nucleolus was in relation to a Cu accumulation. Cu deposit was well located in the network as pars granulosa and nucloplasm showed very lower metal concentrations. The origin and consequence of network structure in nucleolus was discussed

  5. Garra kalpangi, a new cyprinid fish species (Pisces: Teleostei) from upper Brahmaputra basin in Arunachal Pradesh, India

    OpenAIRE

    K. Nebeshwar; K. Bagra; Das, D.N.

    2012-01-01

    A new cyprinid species, Garra kalpangi is described from the Kalpangi River (Brahmaputra basin) in Arunachal Pradesh, India. The species is closely similar to G. gravelyi, G. rotundinasus and G. elongata in having a shared character i.e. a weakly developed proboscis. It is distinguishable from G. gravelyi for the absence of indistinct black spot at the bases of branched dorsal fin rays and lateral stripes on the side of the body. However, G. rotundinasus possesses lateral stripe along the ...

  6. Presencia de caracteres atípicos en dos ejemplares de rape Lophius budegassa Spinola, 1807 capturados en el mar Cantábrico

    OpenAIRE

    Landa, J.; Pereda-Pérez, P. (Pilar); Barrado-Fernández, J. (Joaquín)

    2001-01-01

    Two specimens of anglerfish Lophius budegassa Spinola, 1807 with atypical characteristics, caught in the Bay of Biscay by trawlers during 1996 and 1997, are described. One of them was totally albinistic, with unpigmented peritoneum, blindness, and 5 rays at its first dorsal fin. The first three characteristics seem to be associated, and it is the largest albinistic specimen of L. budegassa described to date. The other specimen had orange spots on its dorsal side and on the edges of the pector...

  7. Research of marine isolates in development of biosensors for environmental pollutants

    OpenAIRE

    Gokhale, Trupti; Wali, Almas; Parikh, Shailee; Sood, Neeru

    2012-01-01

    Bioluminescence is a phenomenon exhibited by various organisms like marine bacteria, glow worms, fireflies, anglerfish, jelly fish, etc. These organisms can produce and emit light. Bioluminescence is a natural process of energy release in the form of emitted light. The organisms produce chemicals, luciferin, which is a pigment and an enzyme luciferase. Luciferin reacts with oxygen to release energy in the form of light with the help of enzyme luciferase. The reaction requires energy in the fo...

  8. Characterization of proinsulin- and proglucagon-converting activities in isolated islet secretory granules

    OpenAIRE

    1981-01-01

    The conversion of proglucagon and proinsulin by secretory granules isolated from both prelabeled and unlabeled anglerfish islets was investigated. Either granules isolated from tissue labeled with [3H]tryptophan and [14C]isoleucine or [35S]cysteine, or lysed granules from unlabeled tissue to which exogenously labeled prohormones had been added were incubated under various conditions. Acetic acid extracts of these granule preparations were analyzed for prohormone and hormone content by gel fil...

  9. Dieta de espécies de Anostomidae (Teleostei, Characiformes na área de influência do reservatório de Manso, Mato Grosso, Brasil Diet of Anostomidae species (Teleostei, Characiformes in the influence area of Manso Reservoir, Mato Grosso, Brazil

    Directory of Open Access Journals (Sweden)

    Graziela Custodio Balassa

    2004-03-01

    Full Text Available The diet of four species of Anostomidae (Leporinus friderici Bloch, 1794, L. striatus Kner, 1858, L. elongatus Valenciennes, 1849 and Leporinus sp. were investigated in the Manso Reservoir, Mato Grosso State, Brazil. Fish were sampled in three sites: upriver, in the main body of the reservoir, and below the dam. Were analized 276 stomachs. The diet was evaluated using the frequency of ocorrence and volumetric methods. Leporinus friderici showed tendency to herbivory, mainly in the upriver site. In the reservoir and below the dam, it consumed large quantities of fish; Isoptera only in the reservoir. Leporinus striatus and L. elongatus have similar diets, consuming Chironomidae larvae (Diptera, whereas Leporinus sp. was more generalist, feeding similar proportions of vegetable, detritus and insect (Chironomidae and Ephemeroptera. The mouths of the species have different positions: terminal in L. friderici, subterminal in L. elongatus and intermediate in L. striatus and Leporinus sp. The diet overlap values were low, except for L. friderici and Leporinus sp. (0.7 in the upriver, and L. striatus and L. elongatus (0.6 below the dam.

  10. Biologia reprodutiva de Micropogonias furnieri (Desmarest, 1823 (Teleostei, Sciaenidae: 2. Relação gonadossomática, comprimento e peso dos ovários como indicadores do período de desova Reproductive bilogy of Micropogonias funieri (Desmaret 1823 (Teleostei, Scinidae: 2. Gonadosomatic index, legth and weight of ovaries as indicator of spawning season

    Directory of Open Access Journals (Sweden)

    Victoria J Isaac-Nahum

    1987-01-01

    Full Text Available Analisaram-se as variações da relaçao gonadossomática (RGS, do comprimento e do peso médios dos ovários por estádio de maturidade e durante um ano, procurando-se estabelecer indicadores quantitativos do grau de desenvolvimento gonadal e dos períodos de desova da população I de Micropogonias funieri. Constatou-se que, para fêmeas num mesmo estádio de maturidade, nao ocorre dependência entre valores individuais de RGS e peso total, sendo a RGS constante para cada estádio, o que permite sua utilização como indicador do grau de desenvolvimento gonadal. Ocorreram variações cíclicas paralelas nos valores dos três indicadores, cujos valores modais coincidem com os períodos de desova (outono, inverno e primavera-verão, o que nos permite utiliza-los como indicadores desses períodos.Gonadosomatio index (RGS , mean ovaries length and weight variations has been analysed in order to verify if they may be used as quantitative indicators of spawning period and gonadal development in Micropogonias funieri, population I (23º-29ºS. The analysis of the relationships between gonadosomatio index and total weight single valuesy for females in the same maturity stage, didn't show dependence, being a constant value for each stage, which makes it useful as an a indicator of gonadal development. The three indices showed cyclic Variations with modal values corresponding to the three spawning periods (autumn, winter and spring-summer.

  11. Condicionantes ambientais na distribuição e no periodo reprodutivo do Orthopristis ruber (Cuvier (Teleostei, Haemulidae na Baía de Sepetiba, Rio de Janeiro, Brasil Environmental constraints on distribution and reproductive period of Orthopristis ruber (Cuvier (Teleostei, Haemulidae in the Sepetiba Bay, Rio de Janeiro, Brasil

    Directory of Open Access Journals (Sweden)

    André L. B. dos Santos

    2007-12-01

    Full Text Available Orthopristis ruber (Cuvier, 1830 é uma espécie muito comum na costa brasileira, sendo encontrada em baias, onde figura entre os mais abundantes peixes nos arrastos de fundo. Este trabalho tem por objetivo avaliar a influência das condicionantes ambientais na distribuição espaço-temporal e no período reprodutivo de O. ruber na Baía de Sepetiba, uma área costeira semi-fechada no sul do Rio de Janeiro. Foi realizado um programa de arrasto de fundo, entre outubro de 1998 e setembro de 1999, em três zonas da baía, estabelecidas de acordo com sua proximidade do mar (interna, central e externa. Amostras mensais de peixes foram tomadas em triplicatas em cada ocasião de amostragem, bem como foram medidas as variáveis ambientais de temperatura, salinidade, transparência e profundidade. Abundância relativa foi avaliada com base nas CPUEs (Captura por Unidade de Esforço em termos de número e de biomassa, enquanto o período reprodutivo foi determinado com o índice gonadossomático. Um total de 866 indivíduos foi capturado, com o tamanho variando entre 31 e 293 mm de comprimento total e proporção sexual de 1:1. Um maior número de peixes foi registrado em janeiro/fevereiro e em maio, embora não tenha sido encontrada diferença na abundancia relativa entre as estações do ano. Espacialmente, os maiores números e biomassas foram registrados na zona externa. Correlação positiva significativa foi encontrada entre a abundancia relativa e a profundidade, salinidade e transparência, e negativa com a temperatura. O período reprodutivo, indicado pelos maiores valores de índices gonadosomático (IGS, provavelmente ocorre de junho a setembro, coincidindo com as menores temperaturas. Esta espécie parece ter distribuição limitada às zonas mais externa da baia, próxima à influência com o mar, com maiores influxos no verão, como provável efeito da das Águas Centrais do Atlântico Sul (ACAS que comprimem as Águas Costeiras (AC para a baía.Orthopristis ruber (Cuvier, 1830 is a very common species in the Brazilian coast, being found in large abundance in bays where they rank among the most numerical abundant species in bottom trawls. This work aims to assess environmental influences on spatial, temporal distribution and reproductive period of O. ruber in the Sepetiba Bay, a coastal semi-closed area in the Rio de Janeiro State. Monthly samplings were carried out using otter trawl from October 1998 to September 1999, in three Bay zones, defined according to the proximity of the sea (inner, middle and outer. Samples were taken as triplicate at each site as well as environmental measurements of water temperature, salinity, transparency and depth. Relative abundance was assessed by CPUE (capture per unit effort in both number and weight. The reproductive period was determined by the gonadossomatic index. A total of 866 individuals was caught, with size ranging from 31 to 293 mm Total Length and sex ratio 1:1. Higher fish numbers and biomass were recorded in January/February and May, although no significant difference was found among seasons. Spatially, the highest number and biomass were recorded in the outer zone. Positive significant correlation between relative abundance and depth, salinity and transparency and negative with temperature were found. The reproductive period, indicated by the highest gonadosomatic index (IGS occurred probably between June and September, coinciding with the lowest temperatures. This species seems to have distribution limited to outer bay zones, near to the sea influence, with the highest influxes in Summer, as a probable effect of the South Atlantic Central Waters (SACW that compress Coastal Waters (CW toward the bay.

  12. Oportunismo alimentar de Knodus moenkhausii (Teleostei, Characidae: uma espécie abundante em riachos do noroeste do Estado de São Paulo, Brasil Feeding opportunism of Knodus moenkhausii (Teleostei, Characidae: an abundant species in streams of the northwestern in the state of São Paulo, Brazil

    Directory of Open Access Journals (Sweden)

    Mônica Ceneviva-Bastos

    2007-03-01

    Full Text Available O objetivo deste estudo foi investigar a biologia alimentar de Knodus moenkhausii (Eigenmann & Kennedy, 1903 em riachos do Alto rio Paraná no Estado de São Paulo. Em oito riachos (R1-R8, K. moenkhausii se alimentou de 18 itens, dos quais algas, ninfas de efemerópteros e larvas de dípteros foram os itens autóctones mais freqüentes e dominantes; fragmentos de insetos terrestres, himenópteros e aranhas foram os itens alóctones mais freqüentes e dominantes. No riacho R2, K. moenkhausii apresentou dieta distinta dos demais riachos, principalmente em função da profundidade, tipo de substrato e da presença de vegetação ripária. No riacho R9, amostrado mensalmente durante um ano, foram identificados 15 itens, dos quais insetos terrestres predominaram ao longo do ano; larvas de dípteros e algas foram pouco expressivas nos períodos de dezembro-janeiro (período mais quente e chuvoso e junho-julho (período mais frio e seco. No riacho R9 foram realizadas observações subaquáticas durante mergulho livre, onde observamos a cata de itens na coluna d'água junto do substrato, da vegetação submersa e na superfície da água. A elevada variedade de itens consumidos - condicionada às variações do hábitat e sazonais - e a prática de diversas táticas nos permitem considerar K. moenkhausii uma espécie oportunista quanto ao uso dos recursos alimentares. Este oportunismo aparentemente se reflete na abundância da espécie, demonstrando boa capacidade em alocar parte significativa de sua energia à reprodução, mesmo em ambientes fisicamente impactados por ação antrópica.In the present investigation we studied the feeding biology of Knodus moenkhausii (Eigenmann & Kennedy, 1903 in streams of the Upper Paraná river system in the state of São Paulo. In eight streams (R1-R8, K. moenkhausii consumed 18 items, of which algae, ephemeropteran nymphs, and dipteran larvae were the most frequent and dominant autochthonous items, as were terrestrial insects, hymenopterans, and spiders regarding allochthonous items. In the R2 stream, K. moenkhausii showed distinct diet, mostly due to depth, substrate type, and presence of riparian vegetation. In the R9 stream (monthly sampled for one year, 15 items were consumed, of which terrestrial insects predominated all year round; dipteran larvae and algae were least relevant during December-January (hot and wet period and June-July (cold and dry period, respectively. During snorkeling observations in this stream, we recorded individuals performing drift feeding, picking at relatively small preys close to the substrate and submerged vegetation, and surface picking. The large diversity of consumed items - conditioned to habitat and seasonal variations - and the diversity of feeding tactics allow us to consider K. moenkhausii a rather opportunistic fish species. Such opportunism apparently reflects on the species abundance, showing its ability to allocate a significant part of its energy to reproduction, even in physically impacted habitats by human actions.

  13. Anatomia e histologia gastrintestinal da garoupa-verdadeira Epinephelus marginatus (Lowe, 1834 (Teleostei, Serranidae - doi: 10.4025/actascibiolsci.v32i4.4462 Dusky grouper Epinephelus marginatus (Lowe, 1834 (Teleostei, Serranidae gastrintestinal anatomy and histology - doi: 10.4025/actascibiolsci.v32i4.4462

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    José Roberto Machado Cunha da Silva

    2010-11-01

    Full Text Available A garoupa-verdadeira (Epinephelus marginatus é uma espécie de serranídeo com grande importância ecológica e boas perspectivas para o cultivo. A investigação da morfologia do trato digestório, associada à atividade alimentar, é fundamental para a compreensão da biologia dessa espécie e premissa básica para pesquisas sobre requerimentos nutricionais, desenvolvimento de rações e práticas adequadas de manejo alimentar. O presente trabalho descreve a anatomia e, por meio da microscopia de luz, as variações histológicas ao longo do tubo digestório de juvenis de Epinephelus marginatus, correlacionando a histologia de cada seguimento com as respectivas funções e o hábito alimentar. Verificou-se que essa espécie possui elevado número de tipos celulares ao longo do tubo digestório que estão intimamente relacionados com a resposta imunológica inata e adaptativa, permitindo o hábito alimentar detritívoro.The dusky grouper (Epinephelus marginatus is a serranida species with great ecological importance and good perspectives for rearing. The investigation of the digestive tract morphology associated to the feeding activity is essential for the understanding of the biology of this species and a basic premise for research on feed requirements, feed development and appropriate feeding methods. The present study describes the anatomy and histological variations along the digestive tract of Epinephelus marginatus juveniles associating the histology with function and feeding habit. It was verified that this species possesses a high number of different cellular types along the digestive tube intimately related with the innate and adaptative immunological responses.

  14. Condição reprodutiva da betara preta, Menticirrhus americanus (Teleostei, Sciaenidae, na pesca realizada no litoral norte de Santa Catarina, Brasil - DOI: 10.4025/actascibiolsci.v30i4.1230 Reproductive status of Menticirrhus americanus (Teleostei, Sciaenidae in fisheries performed on the Southern coast of Brazil - DOI: 10.4025/actascibiolsci.v30i4.1230

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    Elneison da Rosa Muniz

    2008-11-01

    Full Text Available No litoral brasileiro, a legislação costuma regular as práticas pesqueiras segundo o ciclo de vida das espécies-alvo, mas o fato deste não ser coincidente entre as espécies dominantes nas capturas dificulta o manejo em pescarias multiespecíficas. No litoral de Santa Catarina, o defeso aplica-se apenas à pesca de arrasto, e para tal considera o período reprodutivo do camarão sete-barbas, Xyphopenaeus kroyeri. O presente trabalho investiga a incidência da atividade pesqueira sobre indivíduos em reprodução da betara preta, Menticirrhus americanus, espécie comercialmente apreciada e frequente nas pescarias. As amostragens ocorreram em 2006 e 2007, em desembarques do município de Itapoá, norte do Estado (26°00’S; 48°36’W. Calcularam-se os valores de proporção sexual, frequência de estádios de maturação, índice gonadossomático e tamanho de primeira maturação, e relacionou-se a captura de indivíduos em reprodução com a época do ano e a arte de pesca utilizada. Concluiu-se que a atividade pesqueira incide sobre uma parcela populacional que compreende indivíduos em atividade reprodutiva durante, ao menos, duas estações do ano. Há diferenças entre as artes de pesca: a de arrasto não atinge indivíduos em reprodução; a de caceio atua majoritariamente sobre jovens e em maturação; e a de fundeio, principalmente sobre indivíduos em atividade reprodutiva, sobretudo na primavera e no verão.Fisheries rules usually take into account the life cycle of target species. But as these species differ, multi-specific fisheries prove difficult to be managed. In the southern coast of Brazil (26°00’S, 48°36’W, an annual closed fishing season is exclusive to trawling only, which target species such as the shrimp Xyphopenaeus kroyeri . In this region, the consequences of trawling and gillnets on the life cycles of fish remain unknown. The present work has surveyed the incidence of small-scale fisheries on the reproductive cycle of the Sciaenidae Menticirrhus americanus. Landings were sampled in 2006 and 2007, and sexual ratio, seasonal distribution of gonadal stages, gonadossomatic index and length at first maturity were estimated. Catches of reproductive individuals were analyzed according to the fishing season and fishing gears employed. Resultes showed that catches of Menticirrhus americanus include, at least during two seasons per year, individuals in breeding activity. Trawling does not catch maturing, mature or ripe specimens; gillnets of the caceio type act mainly on young and maturing individuals; and gillnets of the fundeio type act mainly on mature and ripe individuals, in spring and summer.

  15. Morfologia e hábitos alimentares de duas espécies de Engraulidae (Teleostei, Clupeiformes na Baía de Sepetiba, Rio de Janeiro Morphology and feeding habits of two engraulid fish (Teleostei, Clupeiformes in the Baía de Sepetiba, Rio de Janeiro

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    Sandra Sergipensel

    1999-01-01

    Full Text Available Foram estudados as hábitos alimentares dos peixes engraulídeos Anchoa januaria e Cetengraulis edentulus na Baía de Sepetiba, Rio de Janeiro, de julho de 1983 a julho de 1985. Os itens alimentares e as estruturas morfológicas relacionadas à alimentação indicaram que a área superficial dos rastros branquiais de A. januaria e C. edentulus é mais eficiente para a filtração dos alimentos, do que as distâncias entre os mesmos. Estas estruturas morfológicas possibilitam uma seletividade no tamanho dos itens alimentares, resultando em formas distintata de obtenção do alimento, entre as duas espécies. A. januaria seleciona o zooplâncton, por captura dos itens alimentares, enquanto C. edentuluss é um fitoplanctófago filtrador. Anchoa januaria tem hábitos alimentares diurnos e explgra diferentes estratos da coluna d'água durante os períodos frio e quente.Feeding habits of the engraulidid flsh - Anchoa januaria and Cetengraulis edentullus were studied in the Baía de Sepetiba, Rio de Janeiro, from July 1983 to July 1985. Dietary items and morphological structures "blted to feeding indicate that the surface structures of branchial rays of A. januaria and C. edentulus are more useful for food filtration than the distance between them. Those morphological structures provide a separation of the size of dietary items, thw resoltins in different forms of feeding behaviors between two species. A. januaria is a selective zooplanktivore, picking up food items, whereas C. edentulus is a filtering phytaplanktivore. Anchoa januaria is a diurnal feeder and exploits different layers in the water column during the warm and cold seasons.

  16. Morfologia e crescimento do músculo estriado esquelético no pirarucu Arapaima gigas Cuvier, 1817 (Teleostei, Arapaimidae - DOI: 10.4025/actascibiolsci.v30i2.3640 Morphology and skeletal muscle growth in pirarucu Arapaima gigas Cuvier, 1817 (Teleostei, Arapaimidae - DOI: 10.4025/actascibiolsci.v30i3.3640

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    Maeli Dal Pai Silva

    2008-05-01

    Full Text Available O objetivo deste trabalho foi avaliar as características morfológicas e de crescimento do músculo estriado esquelético no pirarucu (Arapaima gigas. Foram utilizados animais em duas fases de crescimento: alevinos, com 50 dias de idade, e juvenis, com um ano de idade. Após eutanásia dos animais, fragmentos musculares das regiões dorsal, lateral cranial e lateral caudal foram coletados e congelados em nitrogênio líquido. Cortes histológicos (10 µm foram submetidos às colorações HE e Tricrômico de Gomori, para a análise morfológica, e NADH-TR, para a análise do metabolismo oxidativo das fibras musculares. Foi calculado o menor diâmetro das fibras musculares brancas nas regiões dorsal e lateral cranial. A musculatura dorsal branca mostrou-se mais desenvolvida e, na musculatura lateral, observaram-se compartimentos distintos: superficial vermelho e profundo branco. Nos alevinos, o crescimento muscular ocorreu predominantemente por hiperplasia das fibras e, nos juvenis, predominou o crescimento muscular por hipertrofia.The aim of this work was to evaluate the morphological and growth characteristics of skeletal muscle tissue in pirarucu (Arapaima gigas using alevins (50 days old and juveniles (1 year old. Muscle samples were collected from dorsal, lateral cranial, and lateral caudal regions, and then frozen in liquid nitrogen. Histological frozen sections (10 µm were stained with HE and Gomori Trichrome for morphological analysis, and NADH-TR to evaluate muscle fiber oxidative metabolism. Morphometric analysis samples were obtained from dorsal and lateral cranial regions, and smallest diameter white fibers were measured. White dorsal muscle was thicker and two muscle fiber compartments were identified in the lateral cranial region: red (superficial and white (deep muscle. Hyperplasia muscle growth predominated in alevins and hypertrophy in juveniles.

  17. Revision of Aristocleidus (Monogenoidea: Dactylogyridae, rediscovery of Aristocleidus hastatus, and description of Aristocleidus lamothei n. sp. from the Peruvian Mojarra Diapterus peruvianus (Teleostei: Gerreidae in Mexico Revisión de Aristocleidus (Monogenoidea: Dactylogyridae, redescripción de Aristocleidus hastatus y descripción de Aristocleidus lamothei n. sp. de la mojarra peruana Diapterus peruvianus (Teleostei: Gerreidae en México

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    Delane C. Kritsky

    2008-08-01

    Full Text Available The generic diagnosis of Aristocleidus Mueller, 1936 is emended based on a collection of 2 species of the genus from the gills of the Peruvian mojarra, Diapterus peruvianus (Gerreidae, from a lagoon along the Pacific Coast of Mexico. The genus is characterized in part by species having a deeply incised base of the ventral anchor with the tip of the superficial root conspicuously directed toward that of the deep root. Aristocleidus hastatus Mueller, 1936 is redescribed and Aristocleidus lamothei n. sp. is described from D. peruvianus from the Tres Palos Lagoon, Guerrero State, Mexico. The finding of A. hastatus on D. peruvianus in Mexico represents new host and locality records for the species.Se completa la descripción de Aristocleidus Mueller, 1936 con base en 2 ejemplares recolectados de las branquias de la mojarra peruana, Diapterus peruvianus (Gerreidae, de una laguna situada en la costa del Pacífico de México. El género se caracteriza por tener la base del macrogancho ventral profundamente hundida, con la punta de la raíz superfcial dirigida marcadamente hacia la de la raíz profunda. Se redescribe Aristocleidus hastatus Mueller, 1936 y se describe Aristocleidus lamothei n. sp. de D. peruvianus de la laguna de Tres Palos, Guerrero, México. El hallazgo de A. hastatus en D. peruvianus representa un nuevo registro de hospedero y localidad.

  18. Revision of Aristocleidus (Monogenoidea: Dactylogyridae), rediscovery of Aristocleidus hastatus, and description of Aristocleidus lamothei n. sp. from the Peruvian Mojarra Diapterus peruvianus (Teleostei: Gerreidae) in Mexico Revisión de Aristocleidus (Monogenoidea: Dactylogyridae), redescripción de Aristocleidus hastatus y descripción de Aristocleidus lamothei n. sp. de la mojarra peruana Diapterus peruvianus (Teleostei: Gerreidae) en México

    OpenAIRE

    Kritsky, Delane C.; Mendoza-Franco, Edgar F.

    2008-01-01

    The generic diagnosis of Aristocleidus Mueller, 1936 is emended based on a collection of 2 species of the genus from the gills of the Peruvian mojarra, Diapterus peruvianus (Gerreidae), from a lagoon along the Pacific Coast of Mexico. The genus is characterized in part by species having a deeply incised base of the ventral anchor with the tip of the superficial root conspicuously directed toward that of the deep root. Aristocleidus hastatus Mueller, 1936 is redescribed and Aristocleidus lamot...

  19. Fish remains from Miocene beds of Višnja vas near Vojnik, Slovenia

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    Aleš Šoster

    2013-06-01

    Full Text Available This paper discusses fossil teeth of sharks (Elasmobranchii, Neoselachii and porgies (Teleostei, Sparidae fromthe Miocene glauconite sandstones of Vi{nja vas near Vojnik. The remains of fish teeth, mostly tooth crowns, belongto cartilaginous fishes of the genera Notorynchus, Carcharias, Carcharoides, Isurus and Cosmopolitodus and to abony fish genus Pagrus.

  20. Factors determining parasite community richness and species composition in black snook Centropomus nigrescens (Centropomidae) from coastal lagoons in Guerrero, Mexico

    Czech Academy of Sciences Publication Activity Database

    Violante-González, J.; Mendoza-Franco, Edgar F.; Rojas-Herrera, A.; Guerrero, S.G.

    2010-01-01

    Roč. 107, č. 1 (2010), 59-66. ISSN 0932-0113 Institutional research plan: CEZ:AV0Z60220518 Keywords : TRES-PALOS LAGOON * HELMINTH COMMUNITIES * PACIFIC COAST * BALTIC SEA * FISHES * SIMILARITY * COLONIZATION * TELEOSTEI * BRAZIL * GILLS Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 1.812, year: 2010

  1. Two Procamallanus (Spirocamallanus) species (Nematoda: Camallanidae) from freshwater fishes in the Lower Congo River

    Czech Academy of Sciences Publication Activity Database

    Moravec, František; Jirků, Miloslav

    2015-01-01

    Roč. 60, č. 2 (2015), s. 226-233. ISSN 1230-2821 R&D Projects: GA ČR GBP505/12/G112 Institutional support: RVO:60077344 Keywords : parasitic nematode * new species * redescription * Synodontis * Parachanna * Teleostei * Africa Subject RIV: EG - Zoology Impact factor: 0.905, year: 2014

  2. Age estimates for an adaptive lake fish radiation, its mitochondrial introgression, and an unexpected sister group: Sailfin silversides of the Malili Lakes system in Sulawesi

    OpenAIRE

    Stelbrink, Björn; Stöger, Isabella; Hadiaty, Renny K; Schliewen, Ulrich K.; Herder, Fabian

    2014-01-01

    Background The Malili Lakes system in central Sulawesi (Indonesia) is a hotspot of freshwater biodiversity in the Wallacea, characterized by endemic species flocks like the sailfin silversides (Teleostei: Atherinomorpha: Telmatherinidae) radiation. Phylogenetic reconstructions of these freshwater fishes have previously revealed two Lake Matano Telmatherina lineages (sharpfins and roundfins) forming an ancient monophyletic group, which is however masked by introgressive hybridization of sharpf...

  3. A new species of the Oligocene pomfret fish Paucaichthys (Perciformes; Bramidae) from Iran

    Czech Academy of Sciences Publication Activity Database

    Přikryl, Tomáš; Bannikov, A. F.

    2014-01-01

    Roč. 272, č. 3 (2014), s. 325-330. ISSN 0077-7749 R&D Projects: GA ČR GP13-19250P Institutional support: RVO:67985831 Keywords : Bramidae * Iran * Oligocene * Paucaichthys elamensis sp. nov. * Perciformes * Teleostei Subject RIV: DB - Geology ; Mineralogy Impact factor: 0.519, year: 2014

  4. Schistura puncticeps, a new species of loach from Myanmar (Cypriniformes: Nemacheilidae)

    Czech Academy of Sciences Publication Activity Database

    Bohlen, Jörg; Šlechtová, Vendula

    2013-01-01

    Roč. 24, č. 1 (2013), s. 85-92. ISSN 0936-9902 R&D Projects: GA ČR GA206/08/0637 Institutional research plan: CEZ:AV0Z50450515 Keywords : Teleostei Nemacheilidae * basin Subject RIV: EG - Zoology Impact factor: 2.275, year: 2013

  5. A diverse Eocene fish scale assemblage from Seymour Island, Antarctica

    Czech Academy of Sciences Publication Activity Database

    Přikryl, Tomáš; Vodrážka, R.

    2012-01-01

    Roč. 34, č. 4 (2012), s. 895-908. ISSN 1280-9659 Institutional research plan: CEZ:AV0Z30130516 Institutional support: RVO:67985831 Keywords : Teleostei * scales * lepidology * Eocene * La Meseta Formation Subject RIV: DB - Geology ; Mineralogy Impact factor: 0.927, year: 2012

  6. TUCUNARELLA N. GEN. AND OTHER DACTYLOGYRIDS (MONOGENOIDEA) FROM CICHLID FISH (PERCIFORMES) FROM PERUVIAN AMAZONIA

    Czech Academy of Sciences Publication Activity Database

    Mendoza-Franco, Edgar F.; Scholz, Tomáš; Rozkošná, Petra

    2010-01-01

    Roč. 96, č. 3 (2010), s. 491-498. ISSN 0022-3395 R&D Projects: GA MŠk LC522 Institutional research plan: CEZ:AV0Z60220518 Keywords : NEOTROPICAL MONOGENEA * ANCYROCEPHALINAE * PROPOSAL * GILLS * TREMATODES * TELEOSTEI Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 1.208, year: 2010

  7. Extraction of genomic DNA from solid tissues of teleostei fish/ Extração de DNA genômico em tecidos sólidos de peixes teleósteos

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    Eliane Gasparino

    2006-06-01

    Full Text Available The object of this work was to extract the genomic DNA of solid tissue from Nile tilapia (Oreochromis niloticus, pacu (Piaractus mesopotamicus, piau (Leporinus sp. and curimba (Prochilodus lineatus, using the methods Proteinase K (PK and Cetyltrimethylammiun Bromide (CTAB. The DNA extractedfrom samples of liver, kidney, tail fin, heart, muscle and gills were quantified in spectrophotometer to determine the concentration and purity through the ratio A260nm/A280nm. The data were statistically analyzed and there were no significant effect of interaction between species and tissues about the purityand concentration of the DNA obtained with CTAB, but for the PK there were interaction about the concentration. Using the CTAB method was verified that the mean quantity of DNA in the curimbakidney was significantly (pO objetivo desse trabalho foi extrair o DNA genômico de tecidos sólidos de tilápia do Nilo (Oreochromis niloticus, pacu (Piaractus mesopotamicus, piau (Leporinus sp. e curimba (Prochilodus lineatus, utilizando os métodos Proteinase K (PK e Brometo de Cetiltrimetilamônio (CTAB. O DNA extraído das amostras de fígado, rim, nadadeira caudal, coração, músculo e brânquias foi quantificado em espectrofotômetro para determinação da concentração e da pureza por meio da razão A260nm/A280nm. Os dados foram estatisticamente analisados e não se observou efeito significativo para a interação entre espécies e tecidos em relação à pureza e concentração do DNA obtido a partir do CTAB, porém para PK houve interação em relação à concentração. Utilizando o método CTAB verificou-se que a concentração média de DNA no rim de curimba foi significativamente (p < 0,05 inferior (106,98 ?g/mL à observada em pacu (1727,90 ?g/mL, porém não diferiram das encontradas em piau (497,20 ?g/mL e tilápia (234,50 ?g/ mL. Para o método PK, a concentração média de DNA utilizando o músculo de tilápia do Nilo apresentou o menor valor (117,35 ?g/mL em relação aos demais tecidos e espécies analisadas (p < 0,05. A razão A260nm/A280nm variou de 1,7 a 2,0 e 1,6 a 2,1 para os métodos PK e CTAB, respectivamente. Conclui-se que a pureza do DNA foi alcançada nos diferentes tecidos estudados, demonstrando que o método PK pode ser utilizado para essas quatro espécies de peixes.

  8. Revalidação de Astyanax rupununi Fowler, 1914 (Teleostei, Characidae e descrição de duas espécies novas para o gênero

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    Valdener Garutti

    2003-01-01

    Full Text Available A. rupununi Fowler, 1914, considerada sinônimo de A. bimaculatus (Linnaeus por Eigenmann (1921 é revalidada e duas espécies novas são descritas: A. clavitaeniatus, do alto rio Branco, Roraima, Brasil, e A. siapae, da bacia do Casiquiare-Orinoco, Estados Amazonas e Apure, Venezuela. Essas três espécies apresentam o mesmo padrão básico de coloração: mancha umeral negra horizontalmente ovalada, mancha negra no pedúnculo caudal estendida à extremidade dos raios caudais medianos, duas barras verticais marrons (a primeira cruzando a mancha umeral e a segunda situada 23 escamas atrás e característica faixa lateral negra em forma de clava. Os caracteres que distinguem as três espécies são discutidos e é apresentada uma chave de identificação para as três espécies.Astyanax rupununi Fowler, 1914, previously considered a junior synonym of A. bimaculatus (Linnaeus, 1758, is herein proposed as a valid species. The two species may be distinguished by the presence in A. rupununi of a single black club-shaped lateral stripe, the smaller body and caudal peduncle depths, and by the fewer teeth cuspids. Two new species, with the same basic color pattern of Fowler's species, are described: A. clavitaeniatus sp. n. from the upper Branco river, Roraima State, Amazonia, Brazil, and A. siapae sp. n. from the Casiquiare-Orinoco basin, Amazonas and Apure States, Venezuela. A key to the identification of Astyanax species sharing this color pattern is presented.

  9. Fifteen from one: a revision of the Galaxias olidus Günther, 1866 complex (Teleostei, Galaxiidae) in south-eastern Australia recognises three previously described taxa and describes 12 new species.

    Science.gov (United States)

    Raadik, Tarmo A

    2014-01-01

    The systematics of the Galaxias olidus hyper-species complex from freshwater habitats in south-eastern, mainland Australia is revised. Galaxias olidus Günther 1866 is redescribed, Galaxias fuscus Mack 1936 and Galaxias ornatus Castelnau 1873, previously synonymised with G. olidus (sensu lato), are reinstated as valid taxa and redescribed, and 12 taxa are described as new: Galaxias aequipinnis sp. nov., Galaxias arcanus sp. nov., Galaxias brevissimus sp. nov., Galaxias gunaikurnai sp. nov., Galaxias lanceolatus sp. nov., Galaxias longifundus sp. nov., Galaxias mcdowalli sp. nov., Galaxias mungadhan sp. nov., Galaxias oliros sp. nov., Galaxias supremus sp. nov., Galaxias tantangara sp. nov., and Galaxias terenasus sp. nov. These species are morphologically similar and, whilst there is extensive overlap in meristic counts and morphometric characters, each can be diagnosed by unique combinations of characters, including allozyme loci and colour pattern; morphological diagnosis is improved greatly if based on freshly formalin-fixed material. Galaxias schomburgkii Peters 1868, Galaxias bongbong Macleay 1881, Galaxias kayi Ramsay & Ogilby 1886 and Galaxias oconnori Ogilby 1912 are retained as junior synonyms of G. olidus (sensu stricto). The types for Galaxias findlayi Macleay 1882 are lost and no specimens matching its description were collected or examined from the Mt. Kosciuszko region; it is also currently retained as a junior synonym of Galaxias olidus s.s. The species G. terenasus sp. nov. and G. arcanus sp. nov. are the most morphologically specialised in the complex and G. olidus s.s remains the most morphologically variable species. It also remains the most widespread taxon, though its previously known distribution is reduced, particularly in the south-west of its range. Nine species are narrow-range endemics, known from one, or only a few, locations, and these restricted distributions most probably reflect the fragmentation and reduction of former ranges caused by the effects of alien salmonids. Eleven species are of conservation concern, most are considered critically endangered. PMID:25543673

  10. Phylogenetic position and osteology of Pethia setnai (Chhapgar and Sane, 1992), an endemic barb (Teleostei: Cyprinidae) of the Western Ghats, India, with notes on its distribution and threats

    OpenAIRE

    U. Katwate; Paingankar, M.S.; Jadhav, S; N. Dahanukar

    2013-01-01

    Pethia setnai is an endemic and threatened freshwater fish of the Western Ghats of India. It has a restricted distribution in the west flowing rivers in the states of Maharashtra, Goa and Karnataka. We clarify the phylogenetic position of Pethia setnai, provide osteological details of topotypic material, and morphometric data of specimens from Maharashtra, Goa and Karnataka. We also provide details on micro-level distribution, habitat and threats to the species in its native range.

  11. Descripción de una nueva especie de bagre marino fósil (Teleostei, Siluriformes, Ariidae del Mioceno de la provincia de Río Negro, Argentina

    Directory of Open Access Journals (Sweden)

    Sergio Bogan

    2011-01-01

    Full Text Available En este trabajo se describen dos cráneos de la familia Ariidae procedentes del miembro Saladar de la Formación Gran Bajo del Gualicho, ubicados en las Salinas del Gualicho, provincia de Río Negro, Argentina. La edad de los depósitos del Miembro Saladar se remonta al Mioceno Temprano alto/Mioceno Medio bajo. Los materiales son asignados a una nueva especie extinta del género viviente Genidens. Este nuevo taxón se distingue de todas las especies actuales por presentar un proceso supraoccipital muy corto, ancho y redondeado, extraescapular subcircular y mesetmoides amplios con una conspicua escotadura mesial, frontales prácticamente planos en vista lateral y margen lateral de los huesos esfenóticos rectilíneo. Genidens sp. nov., representa el registro más antiguo para el género y constituiría una especie de aspecto similar a las formas actuales del género. sp. nov., representa el registro más antiguo para el género y constituiría una especie de aspecto similar a las formas actuales del género.

  12. Gonadotropin-dependent oocyte maturational competence requires activation of the protein kinase A pathway and synthesis of RNA and protein in ovarian follicles of Nibe, Nibea mitsukurii (Teleostei, Sciaenidae)

    Science.gov (United States)

    Yoshizaki, G.; Shusa, M.; Takeuchi, T.; Patino, R.

    2002-01-01

    Luteinizing hormone- (LH)-dependent ovarian follicle maturation has been recently described in two stages for teleost fishes. The oocyte's ability to respond to the steroidal maturation-inducing hormone (MIH), also known as oocyte maturational competence (OMC), is acquired during the first stage; whereas the MIH-dependent resumption of meiosis occurs during the second stage. However, studies directly addressing OMC have been performed with a limited number of species and therefore the general relevance of the two-stage model and its mechanisms remain uncertain. In this study, we examined the hormonal regulation of OMC and its basic transduction mechanisms in ovarian follicles of the sciaenid teleost, Nibe (Nibea mitsukurii). Exposure to MIH [17,20??-dihydroxy-4-pregnen-3-one or 17,20??,21-trihydroxy-4-pregnen-3-one] stimulated germinal vesicle breakdown (index of meiotic resumption) in full-grown follicles primed with human chorionic gonadotropin (HCG, an LH-like gonadotropin) but not in those pre-cultured in plain incubation medium. The induction of OMC by HCG was mimicked by protein kinase A (PKA) activators (forskolin and dibutyryl cyclic AMP), and blocked by specific inhibitors of PKA (H89 and H8) as well as inhibitors of RNA (actinomycin D) and protein (cycloheximide) synthesis. Forskolin-induced OMC was also inhibited by actinomycin D and cycloheximide. A strong activator of protein kinase C, PMA, inhibited HCG-dependent OMC. In conclusion, OMC in Nibe ovarian follicles is gonadotropin-dependent and requires activation of the PKA pathway followed by gene transcription and translation events. These observations are consistent with the two-stage model of ovarian follicle maturation proposed for other teleosts, and suggest that Nibe can be used as new model species for mechanistic studies of ovarian follicle differentiation and maturation in fishes.

  13. Bipteria formosa (Kovaleva et Gaevskaya, 1979) comb. n. (Myxozoa: Myxosporea) in whiting Merlangius merlangus (Teleostei: Gadidae) from Denmark

    DEFF Research Database (Denmark)

    Karlbakk, Egil; Køie, Marianne

    2009-01-01

    spore of is described in detail and compared with other Bipteria spp. The phylogenetic position of B. formosa, based on partial 18S rDNA sequences, is closest to Leptotheca fugu Tun, spp. The phylogenetic position of , based on partial 18S rDNA sequences, is closest to Tun, Yokoyama, Ogawa et...

  14. Premières données sur les relations génétiques entre onze espèces ouest-africaines de Mormyridae (Teleostei, Osteichthyes)

    OpenAIRE

    Agnèse, Jean-François; Bigorne, Rémy

    1992-01-01

    Une étude du polymorphisme des protéines enzymatiques a été entreprise sur vingt deux échantillons représentant à cinq genres de #Mormyridae$. Seize locus ont pu être étudiés. Les espèces étudiées des #Petrocephalus$ et #Marcusenius$ sont génétiquement bien individualisées à l'inverse des espèces étudiées des genres #Mormyrops$, #Hippopotamyrus$ et #Pollimyrus$ qui apparaissent très proches. L'existence de trois espèces récemment décrites de #Petrocephalus$ est confirmée, et la position parti...

  15. Diversidade cariotípica de "Astyanax asuncionensis" (Teleostei, Characiformes na microbacia do rio Sepotuba (Alto Paraguai. DOI: 10.7902/ecb.v3i2.9

    Directory of Open Access Journals (Sweden)

    Patrícia Giongo

    2013-07-01

    Full Text Available Este trabalho teve por objetivo utilizar ferramentas da citogenética para estudar A. asunsionensis na microbacia do Sepotuba. Os espécimes foram coletados, nos córregos São José e Bocaiuval e no Rio Sepotuba, na região de Tangará da Serra – MT. Os peixes coletados foram submetidos às técnicas citogenéticas clássicas. A partir da coloração convencional foi possível observar a ocorrência de 5 citótipos. Citótipo A foi encontrado no Rio Sepotuba com número cromossômico 2n=50, número fundametal (NF=94 e morfologia cromossômica 14m+10sm+18st+8a. No córrego São José encontrou-se 3 citótipos, o citótipo B com 2n=50, 4m+20sm+14st+12a e NF=88, o citótipo C com 2n=50, 26m+14sm+22st+8a e NF=92, o citótipo D com 2n=48, 6m+10sm+16st+16a e NF= 80. O citótipo E do córrego Bocaiuval encontrou-se 2n=50, 6m+10sm+20st+14a e NF=86. A impregnação com nitrato de prata registrou-se marcações simples nas regiões teloméricas dos cromossomos submetacêntricos e a banda C evidenciou regiões heterocromáticas na região teloméricas, centroméricas e pericentroméricas. Os resultados evidenciam uma variação interpopulacional da macroestrutura cariotípica em Astyanax asuncionensis.  

  16. Skoulekia meningialis n. gen., n. sp. (Digenea: Aporocotylidae Odhner, 1912) a parasite surrounding the brain of the Mediterranean common two-banded seabream Diplodus vulgaris (Geoffroy Saint-Hilaire, 1817) (Teleostei: Sparidae): description, molecular phylogeny, habitat and pathology.

    Science.gov (United States)

    Alama-Bermejo, Gema; Montero, Francisco Esteban; Raga, Juan Antonio; Holzer, Astrid Sibylle

    2011-01-01

    This study describes a new aporocotylid genus and species, Skoulekia meningialis n. gen., n. sp. which was detected in the ectomeningeal veins surrounding the optic lobes of the brain of the common two-banded seabream Diplodus vulgaris (Geoffroy Saint-Hilaire, 1817) from the Gulf of Valencia (Mediterranean Sea). A detailed morphological description of S. meningialis is provided, including drawings, measurements and scanning electron microscopy images as well as a phylogenetic study of S. meningialis and closely related taxa using DNA sequence data obtained from whole ITS2 and partial 18S and 28S rDNA regions. Morphology as well as molecular phylogeny strongly support the erection of a new genus and demonstrate its close relationship with the genera Psettarium (Goto & Ozaki, 1930) and Pearsonellum Overstreet & Køie, 1989. Skoulekia is the second aporocotylid genus described in the Sparidae, a family including economical important fishes. In contrast to the majority of the aporocotylids, which inhabit the heart or the blood vessels of the gills, S. meningialis inhabits the ectomeningeal veins surrounding the optic lobes. Eggs were found trapped within the gill vessels. Normally, blood fluke pathology is almost exclusively related to the eggs. However, in the case of S. meningialis, main histopathological alterations were related to the adult blood flukes which were found to cause mild localised meningitis. PMID:20950706

  17. Ostéologie et relations phylogénétiques de Steurbautichthys ("Pholidophophorus") aequatorialis gen. nov. (Teleostei, "Pholidophoriformes") du Jurassique moyen de Kisangani, en République Démocratique du Congo

    OpenAIRE

    Taverne, L.

    2011-01-01

    The osteology of Steurbautichthys ("Pholidophorus") aequatorialis gen. nov. from the Middle Jurassic of Kisangani (Stanleyville Formation, Songa Limestones) in the Democratic Republic of Congo is studied in detail. This fish, about 25 cm long, is marked by a large head, a rather aquiline snout and a small oval median rostral, which does not reach to the tip of the snout. The broad nasals meet on the mid-line anteriorly, but are separated by the frontals posteriorly. The anterior extremity of ...

  18. Genetic variability in Oligosarcus paranensis (Teleostei: Characiformes from the São Francisco river, Ivaí river basin – Paraná State, Brazil - doi: 10.4025/actascibiolsci.v35i3.14179

    Directory of Open Access Journals (Sweden)

    Michele Rocha dos Santos

    2013-08-01

    Full Text Available The genetic variability of Oligosarcus paranensis was estimated from a population collected in São Francisco river, Prudentópolis county in Paraná State (Brazil using the electrophoresis in starch gel technique. Eleven enzymatic systems were analyzed: Aspartate aminotransaminase (AAT; E. C. 2.6.1, Alcohol dehydrogenase (ADH; E. C. 1.1.1.1, Esterase (EST; E. C. 3.1.1.1, Glucose-6-phosphate isomerase (GPI; E. C. 5.3.1.9, Glycerol-3-Phosphate dehydrogenase (G3PDH; E. C. 1.1.1, Isocitrate dehydrogenase (IDH; E. C. 1.1.1.42, L-lactate dehydrogenase (LDH; E. C. 1.1.1.27, Malate dehydrogenase (MDH; E. C. 1.1.1.37 , Malate dehydrogenase NADP (ME; E. C. 1.1.1.40, Phosphoglucomutase (PGM; E. C. 5.4.2.2 and Sorbitol dehydrogenase (SORB; E.C. 1.1.1.14. Twenty loci were identified through 15% corn starch gel electrophoresis of which nine (45% were polymorphic. The average expected heterozygosity was estimated as 0.1229 ± 0.1728, and the observed was 0.0586 ± 0.1069, indicating high genetic variability. The average value of FIS = 0.5145 indicates homozygote excess.  

  19. Rediscovery of Hypselobarbus pulchellus, an endemic and threatened barb (Teleostei: Cyprinidae) of the Western Ghats, with notes on H. dobsoni and H. jerdoni

    OpenAIRE

    J.D.M. Knight; Rai, A.; R.K.P. Dsouza

    2013-01-01

    Hypselobarbus pulchellus, is a poorly known species, with very few verifiable records since its description in 1870. Many authors have considered H. pulchellus to be a synonym of either H. dobsoni or H. jerdoni. This lack of information and clarity on its identity has led to H. pulchellus being categorized as a ‘Critically Endangered’ (possibly Extinct) species in the IUCN Red List of Threatened Species. Based on the collection of H. pulchellus from its type locality, we re-describe this litt...

  20. CEPF Western Ghats Special Series: Re-description of Hypselobarbus lithopidos (Teleostei: Cyprinidae), based on its rediscovery from the Western Ghats, India, with notes on H. thomassi

    OpenAIRE

    J.D.M. Knight; Rai, A.; R.K.P. Dsouza

    2013-01-01

    In recent times, though the genus Hypselobarbus has been studied substantially, the identities of individual species remain ambiguous. Hypselobarbus lithopidos has been assessed as Data Deficient in the IUCN Red List of Threatened Species with a speculation that it could possibly be extinct as there has not been any validated record of this species since 1941 from its known range. In this work we report a population of this species from its type locality and re-describe this little known sp...

  1. Small-scale clinal variation, genetic diversity and environmental heterogeneity in the marine gobies Pomatoschistus minutus and P. lozanoi (Gobiidae, Teleostei)

    OpenAIRE

    Gysels, E.S.; Leentjes, V.; Volckaert, F.A.M.J.

    2004-01-01

    Genetic variation was assayed at 14 allozyme loci in estuarine, coastal and offshore samples of Lozano's goby, Pomatoschistus lozanoi and the sand goby, P. minutus. Samples were taken from locations on the Belgian Continental Shelf and in the Schelde estuary with a range of environmental heterogeneity. We evaluate whether any differences in (1) the degree of genetic variation and (2) allele frequencies at the various loci exist within samples occurring in various habitats on the BCS and in th...

  2. Dactylogyrids (Platyhelminthes: Monogenoidea) parasitizing butterfly fishes (Teleostei: Chaetodontidae) from the coral reefs of Palau, Moorea, Wallis, New Caledonia, and Australia: species of Euryhaliotrematoides n. gen. and Aliatrema n. gen.

    Science.gov (United States)

    Plaisance, Laetitia; Kritsky, Delane C

    2004-04-01

    Seven species of Euryhaliotrematoides n. gen. and 1 species of Aliatrema n. gen. (Monogenoidea; Dactylogyridae) are described and reported from the gills of 15 species of butterfly fishes (Chaetodontidae) from the coral reefs of Moorea (French Polynesia), Wallis (Wallis and Futuna), Heron and Lizard (Australia), Palau (Micronesia), and New Caledonia: Aliatrema cribbi n. sp. from Chaetodon auriga, Chaetodon lunula, Chaetodon trifasciatus, Chaetodon ulietensis, Chaetodon vagabundus, Forcipiger flavisissimus, and Heniochus chrysostomus; Euryhaliotrematoides annulocirrus n. comb. from C. auriga, C. lunula, and C. vagabundus; Euryhaliotrematoides aspistis n. sp. from C. auriga, Chaetodon citrinellus, C. lunula, Chaetodon reticulatus, C. ulietensis, and C. vagabundus; Euryhaliotrematoides berenguelae n. sp. from C. citrinellus, Chaetodon ornatissimus, and F. flavisissimus; Euryhaliotrematoides grandis n. comb. from C. auriga, C. citrinellus, Chaetodon ephippium, Chaetodon kleinii, Chaetodon lineolatus, C. lunula, C. ornatissimus, C. trifasciatus, C. vagabundus, and H. chrysostomus; Euryhaliotrematoides microphallus n. comb. from C. auriga, C. citrinellus, C. ephippium, C. kleinii, C. lunula, C. ornatissimus, C. reticulatus, Chaetodon trifascialis, C. trifasciatus, C. vagabundus, F. flavisissimus, and H. chrysostomus; Euryhaliotrematoides pirulum n. sp. from C. auriga, C. citrinellus, C. lunula, C. trifasciatus, and C. vagabundus; and Euryhaliotrematoides triangulovagina n. comb. from C. auriga, C. citrinellus, C. kleinii, C. lunula, C. ornatissimus, C. vagabundus, F. flavisissimus, H. chrysostomus, and Hemitaurichthys polylepis. All reports of previously described species are new locality records. With exceptions of E. grandis and E. annulocirrus on C. auriga and C. lunula and E. triangulovagina and E. microphallus on C. auriga, all reports are new host records. Haliotrema hainanensis and H. affinis are considered junior subjective synonyms of E. triangulovagina and E. annulocirrus, respectively. Aliatrema n. gen. is characterized by marine dactylogyrids with tandem gonads (germarium pretesticular), haptoral hooks with upright acute thumbs, a coiled copulatory organ with counterclockwise rings and funnel-shaped base but lacking an accessory piece, and a dextral vaginal pore. Euryhaliotrematoides n. gen. is characterized by marine dactylogyrids having tandem gonads (germarium pretesticular), haptoral hooks with upright acute thumbs, a coiled copulatory organ with counterclockwise rings and funnel-shaped base, a vas deferens looping the left intestinal cecum, and a dextral vaginal pore. PMID:15165056

  3. Neotropical Monogenoidea. 54. Proposal of Aetheolabes n. g. (Dactylogyrinea: Diplectanidae), with the description of A. goeldiensis n. sp. from the gills of 'pescada' Plagioscion sp. (Teleostei: Sciaenidae) in Brazil.

    Science.gov (United States)

    Boeger, Walter A; Kritsky, Delane C

    2009-10-01

    Aetheolabes goeldiensis n. g., n. sp. (Diplectanidae) is described from the gills of 'pescada' Plagioscion sp. (Sciaenidae) collected from the Baía de Marajó, about 30 km north of Belém, Pará, Brazil. The monotypic Aetheolabes n. g. is characterised, in part, by its type-species having the haptor and haptoral sclerites modified as a clasp for attachment to the gill tissue of its host, the copulatory complex situated far posterior to the intestinal bifurcation near the mid-length of the trunk, the vaginal pore apparently within the genital atrium, the tegument lacking scales, anchors atypical for diplectanids, and by lacking peduncular spines and squamodiscs. A. goeldiensis n. sp. closely resembles Diplectanum umbrinum Tripathi, 1957 from India and China by the haptoral sclerites forming a clasp, but differs from it primarily by the orientation of the reproductive organs and absence of squamodiscs. PMID:19731097

  4. Monogenoids from the gills of spiny eels (Teleostei: Mastacembelidae) in India and Iraq, proposal of Mastacembelocleidus gen. n., and status of the Indian species of Actinocleidus, Urocleidus and Haplocleidus (Monogenoidea: Dactylogyridae).

    Science.gov (United States)

    Kritsky, Delane C; Pandey, K C; Agrawal, Nirupama; Abdullah, Shamall

    2004-12-01

    Mastacembelocleidus gen. n. (Monogenoidea: Dactylogyridae) is proposed to include two species collected and redescribed from spiny eels (Mastacembelidae) in India and Iraq: Mastacembelocleidus bam (Tripathi, 1959) comb. n. (syn. Ancyrocephalus bam Tripathi, 1959) from the gills of Macrognathus pancalus (new host record) and Macrognathus aculeatus (Synbranchiformes: Mastacembelidae) from Lucknow, India; and Mastacembelocleidus heteranchorus (Kulkami, 1969) comb. n. (syn. Urocleidus heteranchorus Kulkarni, 1969) from the gills of Mastacembelus armatus from Lucknow, India, and Mastacembelus mastacembelus (new host record) from the environs of Erbil, Iraq (new locality record). Urocleidus rhyncobdelli Jain, 1959, Haliotrema tandani Agrawal et Singh, 1982 and Urocleidus raipurensis Dubey, Gupta et Agarwal, 1992 are considered junior subjective synonyms of M. bam. PMID:15729940

  5. Dactylogyrids (Monogenoidea) parasitizing the gills of spinefoots (Teleostei: Siganidae): proposal of Glyphidohaptor n. gen., with two new species from the Great Barrier Reef, Australia, and G. plectocirra n. comb. from Ras Mohammed National Park, Egypt.

    Science.gov (United States)

    Kritsky, Delane C; Galli, Paolo; Yang, Tingbao

    2007-02-01

    Nine species of Siganus (Perciformes: Siganidae) were examined for dactylogyrids (Monogenoidea) from the Red Sea, Egypt; the Great Barrier Reef, Australia; and the South China Sea, China. Species of Tetrancistrum were found on siganids from all 3 localities; Pseudohaliotrema spp. were restricted to siganids from the Great Barrier Reef; and species representing Glyphidohaptor n. gen. were found on siganids from the Red Sea and Great Barrier Reef. Siganus argenteus from the Red Sea and Siganus vulpinus from the Great Barrier Reef were negative for dactylogyrid parasites. Glyphidohaptor n. gen. is proposed for 3 species (2 species new to science) and the new species are described: Glyphidohaptor phractophallus n. sp. from Siganus fuscescens from the Great Barrier Reef; Glyphidohaptor sigani n. sp. from Siganus doliatus (type host), Siganus punctatus, Siganus corallinus, and Siganus lineatus from the Great Barrier Reef; and Glyphidohaptor plectocirra (Paperna, 1972) n. comb. (= Pseudohaliotrema plectocirra Paperna, 1972) from Siganus luridus and Siganus rivulatus from the Red Sea. PMID:17436940

  6. Influence de la fréquence et de la période de nourrissage sur la croissance et l'efficacité alimentaire d'un silure africain, Heterobranchus longifilis (Teleostei, Clariidae)

    OpenAIRE

    Kerdchuen, N.; Legendre, Marc

    1991-01-01

    L'influence de la période (jour, nuit) et de la fréquence d'alimentation (1 à 4 repas fractionnés ou alimentation continue) a été étudiée sur la croissance et l'efficacité alimentaire chez un silure africain (#Heterobranchus longifilis$). L'expérience, d'une durée de 56 jours, a été réalisée sur des poissons de 74 g de poids moyen initial. Avec un même taux de rationnement (3% du poids moyen vif/jour), les poissons nourris la nuit ont une croissance significativement plus élevée que ceux nour...

  7. Estudos cariotípicos de peixes da família Sciaenidae (Teleostei Perciformes da região de Cananéia, SP, Brasil: 1. sobre o cariótipo de Micropogonias furnieri (Desmarest , 1823 Karyotypical study on fish of family Sciaenidade (Teleostei, Perciformes from the region of Cananéia, SP, Brazil: 1. on the karyotype of Micropogonias furnieri (Desmarest, 1823

    Directory of Open Access Journals (Sweden)

    Vicente Gomes

    1983-01-01

    Full Text Available Estudou-se o cariótipo de Micropogonias furnieri (Desmarest, 1823, peixe teleósteo da família Sciaenidae, coletado, na região estuarino-lagunar de Cananéia, SP, Brasil. Foram realizadas preparações de cromossomos mitóticos e meióticos e ensaios de bandamento C e G. O número diplóide encontrado para a espécie foi de 2n = 48 cromossomos tipo t (acrocêntricos, cujos tamanhos variaram entre 3,38 µm e 1,49 µm. O 1º par de homólogos apresenta uma constricção secundária na região proximal ao centrômero. 0 número haplóide encontrado foi de n = 24. 0 conteúdo diploide de DNA foi de 1,24 ± 0,01 picogramas/célula. Não se obteve padrão de bandas G, mas a aplicação da técnica facilitou a identificação de pares adjacentes e a visualização da constricçao secundária. Bandas C localizam-se, principalmente, na região pericentromérica.The chromosomes of Micropogonias furnieri was studied. The diploid number is 48 acrocentric chromosomes and the haploid number is 24. The diploid DNA content of blood cell nucleus was measured. C and G banding techniques were tried.

  8. Alterações histológicas em placas ósseas do peixe cascudo Rineloricaria strigilata (Hensel (Teleostei, Loricariidae e sua freqüência no lago Guaíba, Rio Grande do Sul, Brasil Description of histological abnormalities in the bony plates of the loricariid catfish Rineloricaria strigilata (Hensel (Teleostei, Loricariidae and analysis of its frequency in the lake Guaíba, Rio Grande do Sul, Brazil

    Directory of Open Access Journals (Sweden)

    Fábio Flores-Lopes

    2001-09-01

    Full Text Available Little information is available about natural populations of fishes exposed to polluted waters in Brazil. Contaminants may be lethal or predispose fishes to sickness, being the analysis of aquatic organisms a good indicator of environmental quality. The violinha, Rineloricaria strigilata (Hensel, 1868, is a common loricariid catfish in the Guaíba lake basin, Rio Grande do Sul, Brazil, and has been selected as a bioindicator for being resident, occurring in more than 50% of the samples, and by showing externally detectable neoplasies. These are characterized by its dark pigmentation, bony plates hypertrophy, and hypertrophy and irregular arrangement of the odontodes. Histology showed hypertrophied epitelial tissues, with an increased number of secretory cells, blood cells, and melanina pigments, giving the dark appearance to the neoplasm. Observed frequencies of neoplasm were higher in lake Guaíba than in comparativo samples. Inside lake Guaíba, a pattern of distribution of neoplasm was observed, with the absence of neoplasm in fishes at the collected site that receives water from rio Jacuí, and frequencies of 3.04 to 16.81% in the collection localities in front of Porto Alegre and downstream localities, that receive water from rio Jacuí, rio dos Sinos and rio Gravataí, that drain urban and industrial area of Porto Alegre and neighborhood cities.

  9. 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

  10. Biodiversité des digènes et autres helminthes intestinaux des Rougets : synthèse pour Mullus surmuletus (Linné, 1758) et M. barbatus (L., 1758) dans le bassin méditerranéen

    OpenAIRE

    Le Pommelet, Eve; Bartoli, Pierre; Silan, Patrick

    1997-01-01

    International audience Two species belonging to the genus Mullus (Teleostei) are present in the Mediterranean sea : Mullus surmuletus and M. barbatus. The intestinal helminth community of thes fishes is mainly composed of Trematodes ; its richness and its diversity are one of the highest in this geographic area. Among the 18 digenean species reported within goatfishes, nine have been found again within the populations studied by the authors in the northwestern Mediterranean sea. Three orig...

  11. Evidence for fine scale genetic structure and estuarine colonisation in a potential high gene flow marine goby (Pomatoschistus minutus)

    OpenAIRE

    Pampoulie, C.; Gysels, E.S.; Maes, G.E.; Hellemans, B.; Leentjes, V.; A. G. Jones; Volckaert, F.A.M.J.

    2004-01-01

    Marine fish seem to experience evolutionary processes that are expected to produce genetically homogeneous populations. We have assessed genetic diversity and differentiation in 15 samples of the sand goby Pomatoschistus minutus (Pallas, 1770) (Gobiidae, Teleostei) from four major habitats within the Southern Bight of the North Sea, using seven microsatellite and 13 allozyme loci. Despite its high dispersal potential, microsatellite loci revealed a moderate level of differentiation (overall F...

  12. Phylogenetic relationships of †Luisiella feruglioi (Bordas) and the recognition of a new clade of freshwater teleosts from the Jurassic of Gondwana

    OpenAIRE

    Sferco, Emilia; López-Arbarello, Adriana; Báez, Ana María

    2015-01-01

    Background Teleosts constitute more than 99 % of living actinopterygian fishes and fossil teleosts have been studied for about two centuries. However, a general consensus on the definition of Teleostei and the relationships among the major teleostean clades has not been achieved. Our current ideas on the origin and early diversification of teleosts are mainly based on well-known Mesozoic marine taxa, whereas the taxonomy and phylogenetic relationships of many Jurassic continental teleosts are...

  13. Sturgeon hatching enzyme and the mechanism of egg envelope digestion: Insight into changes in the mechanism of egg envelope digestion during the evolution of ray-finned fish.

    Science.gov (United States)

    Nagasawa, Tatsuki; Kawaguchi, Mari; Sano, Kaori; Yasumasu, Shigeki

    2015-12-01

    We investigated the evolution of the hatching enzyme gene using bester sturgeon (hybrid of Acipencer ruthenus and Huso huso), a basal member of ray-finned fishes. We purified the bester hatching enzyme from hatching liquid, yielding a single band on SDS-PAGE, then isolated its cDNA from embryos by PCR. The sturgeon hatching enzyme consists of an astacin family protease domain and a CUB domain. The CUB domains are present in frog and bird hatching enzymes, but not in teleostei, suggesting that the domain structure of sturgeon hatching enzyme is the tetrapod type. The purified hatching enzyme swelled the egg envelope, and selectively cleaved one of five egg envelope proteins, ZPAX. Xenopus hatching enzyme preferentially digests ZPAX, thus, the egg envelope digestion process is conserved between amphibians and basal ray-finned fish. Teleostei hatching enzymes cleave the repeat sequences at the N-terminal region of ZPB and ZPC, suggesting that the targets of the teleostei hatching enzymes differ from those of amphibians and sturgeons. Such repeat sequences were not found in the N-terminal region of ZPB and ZPC of amphibians and sturgeons. Our results suggest that the change in substrates of the hatching enzymes was accompanied by the mutation of the amino acid sequence of N-terminal regions of ZPB and ZPC. We conclude that the changes in the mechanism of egg envelope digestion, including the change in the domain structure of the hatching enzymes and the switch in substrate, occurred during the evolution of teleostei, likely triggered by the teleost-specific third whole genome duplication. J. Exp. Zool. (Mol. Dev. Evol.) 324B: 720-732, 2015. © 2015 Wiley Periodicals, Inc. PMID:26514945

  14. Aquaculture et ichtyoparasitologie: action in vitro du Nitroxinil© (Antihelminthique) sur Diplectanum aequans , ectoparasite branchial du bar Dicentrarchus labrax

    OpenAIRE

    Silan, Patrick; Birgi, Emile; Louis, Christophe; Clota,, Frédéric; Mathieu, André; Giral, Louis

    1996-01-01

    International audience The sea bass Dicentrarchus labrax is subject to intensive rearing. Several monogeneans, gill ectoparasites with a direct biological cycle, parasitized this Teleostei. Under certain conditions of host density, populations of these platyhelminths can increase and consequently induce important mortality. It's especially the case of Diplectanum aequans, a monopisthocotylea against which no treatment is known. In vitro effects of nitroxinil© (or nitroxynil©), an anthelmin...

  15. Loaches and the environment in two provinces in Northern Vietnam

    Czech Academy of Sciences Publication Activity Database

    Petrtýl, M.; Bohlen, Jörg; Kalous, L.; Bui, A.T.; Chaloupková, P.

    2011-01-01

    Roč. 60, č. 4 (2011), 368-374. ISSN 0139-7893 R&D Projects: GA ČR GA206/05/2556; GA ČR GA206/08/0637 Grant ostatní: MZe(CZ) 29/Mze/B/08-10 Institutional research plan: CEZ:AV0Z50450515 Keywords : biodiversity * conservation * Teleostei Subject RIV: EG - Zoology Impact factor: 0.554, year: 2011

  16. Diet and metazoan parasites of juvenile and subadult silver scabbard fish, Lepidopus caudatus, from the Great Meteor Seamount (North Atlantic)

    OpenAIRE

    Klimpel, S.; Rückert, S; Piatkowski, Uwe; Palm, H. W.; Hanel, Reinhold

    2006-01-01

    Silver scabbard fish Lepidopus caudatus (Euphrasen, 1788) (Trichiuridae) from the Great Meteor Seamount (GMS) in the central eastern Atlantic were studied for diet composition and metazoan parasites. A total of 36 specimens with lengths between 39.1 and 52.2 cm were sampled, which had taken 14 different prey items belonging to 4 major taxonomic groups (Chaetognatha, Crustacea, Mollusca and Teleostei). The most abundant prey organisms were Myctophidae and Euphausiacea, followed by Copepoda (Ca...

  17. Response paper: Morphometric article by Mejía et al. 2015 alluding genera Herichthys and Nosferatu displays serious inconsistencies

    OpenAIRE

    Mauricio de la Maza-Benignos; Ma. de Lourdes Lozano-Vilano; María Elena García-Ramírez

    2015-01-01

    ABSTRACT In the present response paper, the article entitled "Morphometric variation of the Herichthys bartoni (Bean, 1892) species group (Teleostei: Cichlidae): How many species comprise H. labridens (Pellegrin, 1903)?" by Mejía et al . 2015 is critically reviewed. The current review pinpoints some of the more conspicuous conceptual inconsistencies and fundamental errors found in the study by Mejía et al . (2015), It is contended that the authors fail to provide any new insights into the com...

  18. The marine myxosporean Sigmomyxa sphaerica (Thélohan, 1895) gen. n., comb. n. (syn. Myxidium sphaericum) from garfish (Belone belone (L.)) uses the polychaete Nereis pelagica L. as invertebrate host

    OpenAIRE

    Karlsbakk, Egil; Køie, Marianne

    2011-01-01

    Sigmomyxa sphaerica (Thélohan, 1892) gen. n. (Myxozoa, Myxosporea) with myxosporean stages in the gall bladder of Belone belone (L.) (Teleostei, Belonidae) uses the polychaete Nereis pelagica L. (Nereidae) from shallow water in the northern Øresund, Denmark, as invertebrate host. The nearly spherical tetractinomyxon-type actinospores of S. sphaerica differ from those of two species of Ellipsomyxa which also use Nereis spp. as invertebrate host. Pansporocysts of S. sphaerica were not seen. S. ...

  19. Dates and rates of major pelagic deep-sea fish radiations

    DEFF Research Database (Denmark)

    Poulsen, Jan Yde; Miya, Masaki; Kawaguchi, Akira;

    2013-01-01

    lack of defined physical barriers inhibiting gene flow, resulting in difficulties when establishing species richness and ecology, a particularly evident problem when considering volume of habitat available in the deep-sea. However, considering the “hostile” factors such as scarce prey and infrequent...... view of actinopterygian phylogeny. Taxon sampling was chosen with special emphasis on recent results, that showed phylogeny and age estimates from nuclear evidence, allowing us to compare the ages of stem- and crown group nodes of all major deep-sea pelagic fish radiations. Two extreme extinction rates...... were used to calculate the diversification rates of all major deep-sea fish radiations using the different phylogenetic hypotheses and associated estimates of divergence time. Two deep-sea radiations, the order Stomiiformes and the deep-sea Anglerfishes in the suborder Ceratoidei, were found to present...

  20. Mudanças morfológicas dos testículos de curimbatá Prochilodus scrofa (Steindachner) (teleostei, prochilodontidae), submetido à indução hormonal Morphological changes of the testes of the curimbatá, Prochilodus scrofa (Steindachner), under hormonal stimulation

    OpenAIRE

    Emico Tahira Kavamoto; Massuka Yamane Narahara; Elaine Fender de Andrade-Talmelli

    1998-01-01

    This Study Concerns the morphological changes of the testes of "curimbatá", Prochilodus scrofa (Steindachner, 1881) at the beginning of sperm production, before and after the hormonal injections. We examined 25 three year old males that were reared in tanks at the Experimental Fish and Frog Culturing Station of Pindamonhangaba of the Fisheries Institute of São Paulo. The testes were sampled at the start of sperm production, after the first hormone injection (5 IU/g for weight of hCG), and 14 ...

  1. Criopreservação do sêmen testicular do teleósteo piau-açu Leporimus macrocephalus Testicular sperm cryopreservation of the teleost 'piau-açu' Leporinus macrocephalus

    OpenAIRE

    Ribeiro, R. I. M. A.; H.P. Godinho

    2003-01-01

    Avaliaram-se metodologias de criopreservação para o sêmen do piau-açu Leporinus macrocephalus (Teleostei, Anostomidae). O volume de sêmen coletado diretamente dos testículos de seis peixes (446,7±165,1g de peso corporal) foi de 0,4±0,2 ml. Testou-se a toxicidade dos crioprotetores dimetilsulfóxido (DMSO), dimetilacetamida, propilenoglicol, etilenoglicol e metanol nas concentrações de 5%, 10% e 15%. DMSO, dimetilacetamida e propilenoglicol foram os menos tóxicos e, por isso, utilizados na crio...

  2. Feeding of guitarfish Rhinobatos percellens (Walbaum, 1972 (Elasmobranchii, Rhinobatidae, the target of artisanal fishery in Southern Brazil

    Directory of Open Access Journals (Sweden)

    Hugo Bornatowski

    2010-03-01

    Full Text Available Rhinobatos percellens is one of three species of Rhinobatidae found on Brazilian shores and is one of the most abundant species on the shallow continental shelf of Paraná and Santa Catarina States. Specimens caught by artisanal fishery between July/2001 and March/2003 by fishing communities located on the frontier between two southern Brazilian States (Paraná and Santa Catarina had their stomach contents analyzed. According to the Alimentary Index (IAi, Decapoda (69% and Teleostei (22% were the main items consumed. Polychaeta, a common prey consumed by several benthonic fishes, was poorly represented in the feeding of R. percellens. This fact may be related to the availability of prey in the environment, or to the size of the guitarfish analyzed (ontogeny. Seasonal variance of main preys (with higher IAi was observed: Dendrobranchiata and Pleocyemata displayed higher percentages in spring and autumn, Teleostei in the winter and Brachyura during the summer.Rhinobatos percellens é uma das três espécies de Rhinobatidae encontrada na costa brasileira e uma das espécies de elasmobrânquio mais abundante na plataforma continental dos estados do Paraná e Santa Catarina. Indivíduos capturados pela pesca artesanal entre Julho/2001 e Março/2003 nas comunidades pesqueiras localizadas entre o Paraná e Santa Catarina tiveram seus conteúdos estomacais analisados. O Índice de Importância Alimentar (IAi mostrou que as principais presas consumidas foram Decapoda (69% e Teleostei (22%. Polychaeta, principal presa ingerida por várias espécies de peixes bentônicos foi pouco expressiva na alimentação de R. percellens. Essa diferença pode estar relacionada com a disponibilidade de presas no ambiente ou com o tamanho das raias analisadas (ontogenia. De acordo com análises sazonais, observou-se que os camarões Dendrobranchiata e Pleocyemata foram as principais presas consumidas durante a primavera e outono, Teleostei durante o inverno e Brachyura

  3. Morphometric aspects of the digestive tract of Roeboides xenodon and Orthospinus franciscensis

    OpenAIRE

    José Fernando Marques Barcellos; Érika Branco; Daylla Pontes

    2014-01-01

    Roeboides xenodon (dentudo) and Orthospinus franciscensis (piaba-facão) are small Teleostei with omnivorous feeding habits. In order to study the morphology of the digestive tract, specimens of O. franciscensis (n = 15) and R. xenodon (n = 16) were collected in the São Francisco River, Três Marias - MG and fixed in 4% formalin. In both species, a short esophagus began in the head and after the transverse septum, remained in the peritoneal cavity up to the first section of the stomach. In R. x...

  4. Los peces del Jurásico Tardío (Titoniano) de la Cuenca Neuquina, estado actual del conocimiento e implicancias biogeográficas

    OpenAIRE

    Gouiric Cavalli, Soledad; Cione, Alberto Luis

    2013-01-01

    Durante el Jurásico ocurrieron dos de las radiaciones más importantes de vertebrados pisciformes: la de los Neoselachii y la de los Teleostei. De hecho, se constituyó en un momento de diversificación y origen de muchos de los grandes grupos actuales. Históricamente, la mayor parte de los estudios sobre ictiofaunas marinas jurásicas fueron llevados a cabo en el Hemisferio Norte. Es por ello que el conocimiento de la ictiofauna marina jurásica en el Hemisferio Sur no es tan vasto como en el Hem...

  5. Feeding habits of giant otters Pteronura brasiliensis (Carnivora: Mustelidae) in the Balbina hydroelectric reservoir, Central Brazilian Amazon

    OpenAIRE

    Márcia M. M. Cabral; Jansen Zuanon; Gália E. de Mattos; Fernando C. W. Rosas

    2010-01-01

    This study aimed to identify the diet of giant otters, Pteronura brasiliensis (Zimmermann, 1780) in the Balbina reservoir (01º55'S, 59º29'W), to compare it with literature data on the diet of giant otters from non-dammed areas, and to verify the effects of the seasonal changes in water levels on the feeding habits of Balbina otters. A total of 254 feces samples were collected and identified according to the lowest possible taxonomic level. Teleostei fish were present in 100% of the samples; t...

  6. Vigilancia tecnológica para el pez león especie invasora a la diversidad biológica cubana.

    OpenAIRE

    Ginori, M. de los A.; Carro, J.R.

    2010-01-01

    La encuesta realizada a los participantes del proyecto “Estudios preliminares de la presencia del pez león (Teleostei: Scorpaenidae: Pterois sp.) en aguas cubanas” estuvo dirigida al conocimiento de la información externa y el entorno institucional, las herramientas de monitoreo y los recursos de información temas en los cuales se basa la vigilancia tecnológica. Se logró un diseño el cual resultó ser funcional en las 4 etapas y las 15 subetapas propuestas para el Se...

  7. Atlas of marine bony fish otoliths (Sagittae of Southeastern - Southern Brazil Part I: Gadiformes (Macrouridae, Moridae, Bregmacerotidae, Phycidae and Merlucciidae; Part II: Perciformes (Carangidae, Sciaenidae, Scombridae and Serranidae

    Directory of Open Access Journals (Sweden)

    Carmen Lucia Del Bianco Rossi-Wongtschowski

    2014-01-01

    Full Text Available The drawings, detailed pictures, precise descriptions and measurements that characterize otoliths must be made available for studies in various areas, including taxonomy, phylogeny, ecology, fisheries, paleontology, diversity, predator-prey relationships and modeling. The Collection of Teleostei Fish Otoliths of Southeastern-Southern Brazil (COSS-Brasil of IOUSP contains 45,000 pairs of otoliths from 210 species. This publication is the first in a series that will constitute an atlas of Teleostei otoliths for southeastern-southern Brazil and presents the results of the morphologic and morphometric analyses of 11 Gadiformes and 36 Perciformes species by means of the most commonly used features, measurements and indices. Three otoliths of each species were illustrated and photographed whenever possible. The frequency of occurrence was calculated for each characteristic by total length classes (TL, and the ontogenetic differences were analyzed (multiple χ2 test; significance 0.05. Morphometric analyses were conducted for each characteristic per total length (TL class and for the whole sample, and the ontogenetic differences were analyzed.

  8. Gonadal maturation and histological observations of the grey triggerfish Balistes capriscus Gmelin, 1789 (Teleostei:Balistidae) in the Gulf of Gabès, Tunisia

    Institute of Scientific and Technical Information of China (English)

    Hichem Kacem; Lobna boudaya; Lassad Neifar

    2015-01-01

    Objective: To determine the spawning activity using gonadosomatic index (GSI) and gonad histology the Balistes capriscus (Teleostei: Balistidae) of the Gulf of Gabès (Southern Tunisia, Central Mediterranean Sea). Methods: The reproductive biology of the species, based on 756 (480 females and 276 males), collected from commercial catches at several fishing ports including Chebba, Kerkennah and Zarzis at respective GPS coordinates (34°14' N, 11°06' E), (34°45' N, 11°17' E), (33°41' N, 11°48' E) was studied over 28 months (January 2008-April 2010) using GSI and gonad histology. Sizes used in this study ranged from 11.30 to 45.60 cm in fork length. Results: Both GSI and gonad histology suggest that spawning activity occurred mainly between July and mid-September with a peak in July, coinciding with summer time. The first maturation occurred at 20.26 cm fork length for females and 21.30 cm fork length for males. The monthly values of hepatosomatic index and condition factor (K) indicated that the liver is the main organ responsible for the mobilization process of the energizing reserves during the sexual cycle. Conclusions: It is the first inventory of gonadal maturation and histological observations of the grey triggerfish Balistes capriscus Gmelin, 1789 (Teleostei: Balistidae) in the Gulf of Gabès, (Southern Tunisia, Central Mediterranean Sea).

  9. Diversity and community structure of pelagic fishes to 5000 m depth in the Sargasso Sea

    Science.gov (United States)

    Sutton, Tracey T.; Wiebe, Peter H.; Madin, Laurence; Bucklin, Ann

    2010-12-01

    The diversity, abundance and distribution of pelagic fishes from 0-5000 m in the Sargasso Sea, northwestern Atlantic Ocean, were investigated, with primary focus on fishes between 1000-5000 m. A large-volume, fine-mesh (335-μm), discrete-depth sampling system was used to sample the latter strata in 1000-m intervals. Species composition and total biomass of fishes collected in these strata were compared with samples taken 0-1000 m using a smaller midwater trawl. Samples were collected in association with the Census of Marine Zooplankton at-sea DNA-sequencing effort, allowing the determination of genetic barcodes of taxa for which species descriptions do not currently exist (e.g., many male ceratioid anglerfishes). A total of 3965 fish specimens were collected, representing minimally 127 species (84 genera), from 42 families. The bristlemouth, Cyclothone braueri, dominated the catches both above (47%) and below (41%) 1000 m. The Myctophidae and Stomiidae were the most species-rich taxa, while the deep-sea anglerfish suborder Ceratioidei was the most diverse bathypelagic taxon. Thirty species of fish were sequenced and data submitted to GenBank. New Ocean Biogeographic Information System location records for the Saragasso Sea were logged for 84 fish species. Hydrographic data revealed separation of the region into three physical regimes within the top 1000 m (northern, transition, and southern), while the sub-1000 m stratum was fairly homogeneous. Though species richness, abundance, and diversity were highest in the southern Sargasso, diversity indices of whole water column (0-5000 m) samples were not significantly different between regions. Below 1000 m, the 1000-2000 m stratum held the most diverse assemblage across the entire transect, but high diversity was exhibited below 3000 m at two of four stations. Ordination discriminated 13 pelagic fish assemblages, with these related to depth far more than region. Geometric abundance class analysis revealed profound

  10. Photobiology of the deep twilight zone and beyond

    Science.gov (United States)

    Waterman, Talbot H.

    1997-02-01

    Photobiology in the twilight zone of the deep sea depends on faint light of two, or possibly three, origins: sunlight, bioluminescence and some visible radiation near the bottom associated with hydrothermal vents. The deep twilight zone also contains two quite distinct ecosystems: the vast open ocean pelagic regime far from the shore and the bottom as well as the far less expansive benthic regime with quite different characteristic animals that live on, in or near the sea bo10 Most of the whole ocean's benthic regime with a mean depth over 3000m is well below the twilight zone, which eliminates sunlight as a light source there. Many of the most familiar deepsea animals with their spectacular arrays of dennal light organs and remarkable eyes are from the pelagic 19, 25 The less familiar benthic fishes and crustaceans sometimes have curious internal light organs powered by bacteria13 and occasional incredibly modified eyes.30 With the exception of those on the fishing rods of most female deepsea anglerfish, where the light is produced by symbiotic bacteria, all the numerous light organs of pelagic deepsea fishes are generally believed to manage their own chemiluminescence independent of luminous bacteria.17

  11. Fine structural analysis of a teleost exocrine pancreas cellular components - a freeze-fracture and transmission electron microscopic study.

    Science.gov (United States)

    Stipp, A C; Ferri, S; Sesso, A

    1980-01-01

    The normal exocrine pancreas of Pimelodus maculatus (Teleostei) has been studied by freeze-fracture and conventional transmission electron microscopy. 4 cellular types in the acini are observed: the acinar cells, the argentaffin cells, the intermediate cells and the centroacinar cells. The most proeminent cytoplasmic feature of the acinar cells is that the well developed rough endoplasmic reticulum, which appear predominantly under the vesicular form. The argentaffin cells are found lodged between the acinar cells and duct cells, in the connective tissue they are isolated principally that surrounds the ducts. The typical granules are the cytoplasmic component wich characterize the argentaffin cells. The indermediate cells are characterized by the presence of two distinct granule types: one resembling that found in the endocrine cells and the other resembling the granules of the acinar cells. The centroacinar cells is similar that found in other species. PMID:7396226

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

    Directory of Open Access Journals (Sweden)

    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.

  13. Does habitat complexity influence fish recruitment?

    Directory of Open Access Journals (Sweden)

    A. CHEMINÉE

    2014-06-01

    Full Text Available Human activities facilitate coastal habitat transformation and homogenization. The spread of marine invasive species is one example. This in turn may influence fish recruitment and the subsequent replenishment of adult assemblages. We tested habitat complexity effect on fish (Teleostei recruitment by experimentally manipulating meadows of the habitat-forming invasive macroalga Caulerpa taxifolia (Chlorophyta. Among the fourteen fish species recorded during the experiment, only two labrids (Coris julis and Symphodus ocellatus settled in abundance among these meadows. Patterns in the abundance of these juveniles suggested that reduced tri-dimensional meadow complexity may reduce habitat quality and result in altered habitat choices and / or differential mortality of juveniles, therefore reducing fish recruitment and likely the abundance of adults.

  14. Mechanosensation in an adipose fin.

    Science.gov (United States)

    Aiello, Brett R; Stewart, Thomas A; Hale, Melina E

    2016-03-16

    Adipose fins are found on approximately 20% of ray-finned fish species. The apparently rudimentary anatomy of adipose fins inspired a longstanding hypothesis that these fins are vestigial and lack function. However, adipose fins have evolved repeatedly within Teleostei, suggesting adaptive function. Recently, adipose fins were proposed to function as mechanosensors, detecting fluid flow anterior to the caudal fin. Here we test the hypothesis that adipose fins are mechanosensitive in the catfish Corydoras aeneus. Neural activity, recorded from nerves that innervate the fin, was shown to encode information on both movement and position of the fin membrane, including the magnitude of fin membrane displacement. Thus, the adipose fin of C. aeneus is mechanosensitive and has the capacity to function as a 'precaudal flow sensor'. These data force re-evaluation of adipose fin clipping, a common strategy for tagging fishes, and inform hypotheses of how function evolves in novel vertebrate appendages. PMID:26984621

  15. Büyük Menderes nehrinden yakalanan Chondrostoma meandrense (Elvira, 1987) ve Acanthobrama mirabilis (Ladiges, 1960) (Cyprinidae)'in karyotip analizi

    OpenAIRE

    Uysal, Uğur Emek

    2011-01-01

    Bu araştırmada, Büyük Menders Nehrine endemik olan gerçek kemikli balıklara (Teleostei) ait Chondrostoma meandrense (Elvira, 1987) ve Acanthobrama mirabilis (Ladiges, 1960) (Cyprinidae) türlerinin kromozom sayısı ve yapısı belirlenmiş ve karyotip analizi yapılmıştır. Balıklar, Büyük Menderes Nehri ve Büyük Menderes'in kolu olan Çine Çayından serpme ağlarla yakalanarak laboratuvara getirilmiştir. Balıklara her bir gram vücut ağırlığı için 0.005 gr kolkisin abdominal boşluktan enjekte edilmiş v...

  16. The marine myxosporean Sigmomyxa sphaerica (Thélohan, 1895) gen. n., comb. n. (syn. Myxidium sphaericum) from garfish (Belone belone (L.)) uses the polychaete Nereis pelagica L. as invertebrate host.

    Science.gov (United States)

    Karlsbakk, Egil; Køie, Marianne

    2012-01-01

    Sigmomyxa sphaerica (Thélohan, 1892) gen. n. (Myxozoa, Myxosporea) with myxosporean stages in the gall bladder of Belone belone (L.) (Teleostei, Belonidae) uses the polychaete Nereis pelagica L. (Nereidae) from shallow water in the northern Øresund, Denmark, as invertebrate host. The nearly spherical tetractinomyxon-type actinospores of S. sphaerica differ from those of two species of Ellipsomyxa which also use Nereis spp. as invertebrate host. Pansporocysts of S. sphaerica were not seen. S. sphaerica is redescribed on the basis of myxospore stages from B. belone and actinospores from N. pelagica, and the phylogenetic affinities examined on the basis of ribosomal small subunit gene sequences. S. sphaerica is closest related to Ellipsomyxa spp., and is not congeneric with morphologically similar Myxidium spp. from gadids. This is the fifth elucidated two-host life cycle of a marine myxozoan. PMID:21674297

  17. New occurrences of microvertebrate fossil accumulations in Bauru Group, Late Cretaceous of western São Paulo state, Brazil

    Science.gov (United States)

    Alveş, Y. M.; Bergqvist, L. P.; Brito, P. M.

    2016-08-01

    In this work, we present the results of several palaeontological expeditions to four Upper Cretaceous fossil microsites of the Adamantina and Presidente Prudente formations in western São Paulo State, Brazil. Despite the fragmentary condition of the fossils recovered, they represent an important record of vertebrate microremains. The material, recovered through screen washing, comprises teeth and scales of Lepisosteidae; two morphotypes of Halecostomi teeth with similarities to Characiformes and Amiiformes; a Teleostei tooth of molariform shape; fin spines of Siluriformes; teeth of possible Baurusuchidae, Notosuchia (probably Adamantinasuchus or Mariliasuchus), Neosuchia (probably Itasuchus or Goniopholis), and other Mesoeucrocodylia indet.; probable teeth of Abelisauroidea, other Theropoda indet., and a phalanx of Aves. The comparative microvertebrate fossil accumulation from western São Paulo State provides evidence that: 1) floodplain channels accumulate large concentrations of microremains; 2) coarse sandstone privileges enamel tissues like teeth and scales; 3) new vertebrate fossil records have been discovered in Florida Paulista, Alfredo Marcondes, and Alvares Machado outcrops.

  18. Coordinated feeding behavior of the Guiana dolphin, Sotalia guianensis (Cetacea: Delphinidae, in southeastern Brazil: a comparison between populations

    Directory of Open Access Journals (Sweden)

    Elaine C. da S. Oliveira

    2013-12-01

    Full Text Available The coordinated feeding tactics used by delphinids are influenced by differences in the distribution of prey species, season, and opportunities for social learning. In the present study, we compared the coordinated feeding behavior of two populations of the Guiana dolphin, Sotalia guianensis, in southeastern Brazil, and how these feeding tactics vary seasonality and in the presence of calves. We observed eight types of coordinated feeding tactics, which differed in frequency and in the mean number of individuals engaged in them, and between both areas. Feeding tactics used to herd and capture prey were the most frequent and engaged a greater number of individuals, suggesting that these tactics are better for capturing fish that gather in larger schools. Furthermore, the seasons influenced the occurrence of different prey items, which in turn modified the feeding tactics of the dolphins. In the Ilha Grande Bay we observed that bouts lasted longer and larger groups engaged in the feeding tactics, which may be associated with the seasonal spawning of larger schooling fish such as Sardinella brasiliensis (Steindachner, 1879 (Teleostei: Clupeidae. However, in the Sepetiba Bay, we observed longer feeding bouts and a smaller number of individuals engaged in the feeding tactics during autumn-winter. This may be associated with the fact that the most abundant prey species, Micropogonias furnieri (Desmarest, 1823 (Teleostei: Sciaenidae, gathers in small schools. Calves were present in 95% of all coordinated feeding tactics that occurred in the Ilha Grande Bay and in approximately 61% of feeding tactics in the Sepetiba Bay, suggesting that these areas are important for social learning. This study provides more information about feeding tactics and improves knowledge of the coordinated behavior of Sotalia guianensis (Van Benéden, 1864.

  19. Influence of season, size and sex on the dynamic of gill metazoan parasite infesting the Balistes capriscus (Teleostei:Balistidae) of the Gulf of Gabès (Tunisia)

    Institute of Scientific and Technical Information of China (English)

    Hichem Kacem; Lobna boudaya; Lassad Neifar

    2015-01-01

    Objective: To investigate the effects of season, size and sex on the dynamic of gill metazoan parasite infesting the Balistes capriscus (Gmelin, 1788) (Teleostei: Balistidae) (B. capriscus) of the Gulf of Gabès (Southern Tunisia, Central Mediterranean Sea). Methods: A parasitological survey of the grey triggerfish B. capriscus from the Gulf of Gabès (Southern Tunisia, Central Mediterranean Sea) was conducted monthly from June 2011 to June 2012. A total of 1080 fish were collected from commercial catches by pelagic trawl net at different fishing ports at Chebba (34°14' N, 11°06' E), Kerkennah (34°45' N, 11°17' E) and Zarzis (33°41' N, 11°48' E). The weight, size, sex, date and area of capture of each specimen were recorded. Then, B. capriscus was examined to search for ectoparasites. For each parasite species, parasitological indices were calculated. Results: The parasite species are indentified as two copepods: Naobranchia variabilis, Taneacanthus ballistae and a monogenean: Ancyrocephalus balisticus. The parasitological indices depend significantly on seasonality; the highest prevalence of Naobranchia variabilis, Taneacanthus ballistae and Ancyrocephalus balisticus (28.89%, 35.93% and 55.56%respectively) was recorded during summer season (June–August), while the lowest prevalence of each (6.3%, 4.44%, 8.15%) recorded during winter season (December–February). Furthermore the parasitological indices depend significantly on the host size but not on host sex. Conclusions: Our data suggest that the dynamic of gill metazoan parasite infesting B. capriscus is a result of a complex of biotic and abiotic factors. It is the first study on the effects of season, size and sex on the dynamic of gill metazoan parasite infesting B. capriscus (Teleostei: Balistidae) of the Gulf of Gabès (Southern Tunisia, Central Mediterranean Sea).

  20. The fish and fisheries of Jones Bank and the wider Celtic Sea

    Science.gov (United States)

    Martinez, I.; Ellis, J. R.; Scott, B.; Tidd, A.

    2013-10-01

    The Celtic Sea is a diverse fishing ground that supports important commercial fisheries for a range of demersal fish, large and small-bodied pelagic fish and a variety of cephalopods and other shellfish. A regional overview of the main commercial fish stocks of the Celtic Sea and of the fish that occur in the vicinity of Jones Bank are provided through analyses of landings data from English and Welsh vessels, and from scientific trawl surveys. Dedicated smaller scale sampling via trawl surveys combined with baited cameras on and around the Jones Bank were also analysed to investigate the importance of sandbank habitats with attention paid to the differences in the species occurring on the top of the bank in comparison to adjacent off-bank habitats. Official landing statistics for UK (English and Welsh) vessels indicated that the predominant commercial demersal species in ICES Divisions VIIg,h (in terms of quantities landed) were anglerfish, megrim, pollack and skates (Rajidae). There were, however, regional differences in the distribution of fish and fisheries, and the area surrounding Jones Bank (ICES Rectangles 28E1 and 28E2) supports fisheries for megrim, anglerfish, skates, hake, ling and turbot, with otter trawl, gillnet and beam trawl the main gears used. Recent survey data collected with GOV (Grande Ouverture Verticale) trawl from the Celtic Sea (ICES Divisions VIIe-h, 2007-2010) were used to highlight the broad scale distribution of the main fish assemblages in the Celtic Sea. Analyses of the fish and cephalopod catches from these surveys indicated that there were four broad assemblages in the area, including (i) a region around the Cornwall (which will also be partly influenced by the necessity to use rockhopper ground gear on these rough grounds), (ii) the shallower regions of the north-western Celtic Sea (including parts of the Bristol Channel), (iii) the deeper parts of the outer shelf and (iv) the central Celtic Sea. These data also provided