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Sample records for bocarra oligusarcus argenteus

  1. Xeractinol: a new flavanonol C-glucoside from Paepalanthus argenteus var. argenteus (Bongard) Hensold (Eriocaulaceae)

    International Nuclear Information System (INIS)

    New compound isolated from methanolic extract from the leaves of Paepalanthus argenteus var. argenteus (Bongard) Hensold was characterized as xeractinol, a new dihydroflavonol C-glucoside. The structure was elucidated on the basis of extensive spectroscopic analysis (1D and 2D NMR, MS, HREIMS, IR and UV). Ab initio electronic structure calculations support our proposal to the molecular structure. The dihydroflavonol herein isolated may serve as taxonomic marker of Paepalanthus subgenus Xeractis, because this flavonoid have not been reported in any other taxon of Eriocaulaceae. (author)

  2. On the type material of Mus argenteus Temminck, 1844

    NARCIS (Netherlands)

    Smeenk, C.; Kaneko, Y.; Tsuchiya, K.

    1982-01-01

    The taxonomic history of the Japanese Wood Mouse ("Himenezumi" in Japanese) is reviewed. Two scientific names have been widely used: Apodemus argenteus (Temminck, 1844) and Apodemus geisha (Thomas, 1905). To solve this controversy, the type material of Mus argenteus Temminck, 1844 in the Leiden muse

  3. A new species of Rhinonastes (Monogenoidea, Dactylogyridae), nasal parasite of Prochilodus argenteus (Actinopterygii, Characiformes) from Brazil.

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    Monteiro, Cassandra M; Brasil-Sato, Marilia C

    2014-09-01

    A new species of Rhinonastes, hitherto monotypic, is described and illustrated from the nasal cavity of 'curimat', Prochilodus argenteus from São Francisco River, Brazil. Rhinonastes curimatae n. sp. presents a male copulatory organ with more than five rings while the type species of the genus is characterized by male copulatory organ with less than two rings. This is the first record of a nasal parasite in P. argenteus. PMID:25119370

  4. Comparison of community-onset Staphylococcus argenteus and Staphylococcus aureus sepsis in Thailand: a prospective multicentre observational study

    OpenAIRE

    Chantratita, N.; Wikraiphat, C; Tandhavanant, S.; Wongsuvan, G; Ariyaprasert, P.; Suntornsut, P; Thaipadungpanit, J; Teerawattanasook, N.; Jutrakul, Y.; Srisurat, N; Chaimanee, P; Anukunananchai, J.; Phiphitaporn, S; Srisamang, P; Chetchotisakd, P

    2016-01-01

    Staphylococcus argenteus is a globally distributed cause of human infection, but diagnostic laboratories misidentify this as Staphylococcus aureus. We determined whether there is clinical utility in distinguishing between the two. A prospective cohort study of community-onset invasive staphylococcal sepsis was conducted in adults at four hospitals in northeast Thailand between 2010 and 2013. Of 311 patients analysed, 58 (19%) were infected with S. argenteus and 253 (81%) with S. aureus. Most ...

  5. Low occurrence of the new species Staphylococcus argenteus in a Staphylococcus aureus collection of human isolates from Belgium.

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    Argudín, M A; Dodémont, M; Vandendriessche, S; Rottiers, S; Tribes, C; Roisin, S; de Mendonça, R; Nonhoff, C; Deplano, A; Denis, O

    2016-06-01

    Staphylococcus argenteus is a novel Staphylococcus species closely related to Staphylococcus aureus that has been recently described. In this study, we investigated the proportion and the characteristics of S. argenteus recovered from humans in Belgium. S. aureus. human isolates collected in Belgium from 2006 to 2015 (n = 1,903) were retrospectively characterised via the presence of non-pigmented colonies on chocolate agar, spa typing and rpoB sequencing to determine if some of them were in fact S. argenteus. Out of 73 strains non-pigmented on chocolate plates, 3 isolates (0.16 %) showed rpoB sequences, in addition to spa and sequence types (ST2250/t5787, ST2250/t6675, ST3240/t6675), related to S. argenteus. Two of them were methicillin-resistant, harbouring a SCCmec type IV. The three S. argenteus isolates carried genes (sak, scn) of the immune evasion cluster. This first Belgian nationwide analysis showed a low occurrence of S. argenteus. Further studies should be conducted to identify the distribution range and the clinical impact of this new species. PMID:27044019

  6. B chromosomes in the species Prochilodus argenteus ( Characiformes , Prochilodontidae ): morphologicalidentity and dispersion

    OpenAIRE

    Manolo Penitente; Fausto Foresti; Fabio Porto-Foresti

    2015-01-01

    Abstract B chromosomes have attracted the attention of Neotropical fish cytogeneticists in recent years, both for their remarkable occurrence in this group and also because of the interest in studies of the genetic structure and role played in the genome of these organisms. The aim of this study was to report the first occurrence of supernumerary chromosomes in Prochilodus argenteus (Agassiz, 1829), this being the fifth carrier species among thirteen within the genus Prochilodus (Agassiz, 182...

  7. Description and comparison of two economically important fish species mitogenomes: Prochilodus argenteus and Prochilodus costatus (Characiformes, Prochilodontidae).

    Science.gov (United States)

    Chagas, Aline Torres de Azevedo; Carmo, Anderson Oliveira; Costa, Maísa Aparecida; Resende, Leonardo Cardoso; Brandão Dias, Pedro Ferreira Pinto; Martins, Ana Paula Vimieiro; Kalapothakis, Evanguedes

    2016-07-01

    Prochilodus spp. are important Brazilian freshwater migratory fishes with substantial economic and ecological importance. Prochilodus argenteus and Prochilodus costatus are morphologically similar and a molecular species delimitation is impaired due to high degree of sequence identity among the available genetic markers. Here, the complete mitochondrial genome of P. argenteus and P. costatus and their comparison to the mitogenome of P. lineatus are described. The three species displayed a similar mtDNA annotation. A phylogenetic analysis was performed with other Characiformes species. The genus Prochilodus was recovered as a monophyletic group, as well as the family Prochilodontidae, both with high bootstrap probability. PMID:26171874

  8. Reproductive biology of Oligosarcus argenteus (Gunther, 1864 adult males and description of the gonadal maturation stages

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    Sérgio Luis Pinto da Matt

    2009-02-01

    Full Text Available Oligosarcus argenteus belongs to the Acestrorhynchinae subfamily, being restricted to South America, and found in several Brazilian hydrographic basins, in lotic and lentic environments, where they are able to reproduce. With the purpose of studying the reproductive biology of the males from this species, many morphological parameters were analyzed during a 24 month period, as well as characterizing the different testicular maturation stages. A maturity scale, with three stages (I - Initial Maturing, II - Intermediate Maturing, III - Final Maturing was proposed for the adult males of Oligosarcus argenteus. The reproductive period was established by the bimonthly frequency of spermatogenesis and by the gonadal maturation stages.Oligosarcus argenteus é uma espécie pertencente à subfamília Acestrorhynchinae, restrita à América do Sul, sendo comumente encontrada nas várias bacias hidrográficas brasileiras, em ambientes lóticos e lênticos, onde se reproduzem. Com o objetivo de estudar a biologia reprodutiva de machos desta espécie, vários parâmetros morfológicos foram analisados durante um período de 24 meses, assim como foram caracterizados os diferentes estádios de maturação testicular. Estes foram descritos, considerando-se exemplares adultos, em: Estádio I - Maturação Inicial, Estádio II - Maturação Intermediária e Estádio III - Maturação Final. Pela freqüência bimestral das células germinativas e dos estádios de maturação gonadal, a época de reprodução foi determinada.

  9. SADDLEBACK SYNDROME IN WILD SILVER POMFRET, Pampus argenteus (EUPHRASEN, 1788) (FAMILY: STROMATIDAE) FROM THE ARABIAN GULF COASTS OF OMAN

    OpenAIRE

    Juma Al-Mamry; Jawad, L. A.

    2012-01-01

    The saddleback syndrome is recorded for the second time in a wild fish population of the Arabian Sea coasts of Oman. The deformed specimens of Pampus argenteus present a typical saddleback phenotype of missing dorsal fin pterygiophores. The possible causative agents of the saddleback syndrome in fishes are discussed.

  10. SADDLEBACK SYNDROME IN WILD SILVER POMFRET, Pampus argenteus (EUPHRASEN, 1788 (FAMILY: STROMATIDAE FROM THE ARABIAN GULF COASTS OF OMAN

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    Juma Al-Mamry

    2012-10-01

    Full Text Available The saddleback syndrome is recorded for the second time in a wild fish population of the Arabian Sea coasts of Oman. The deformed specimens of Pampus argenteus present a typical saddleback phenotype of missing dorsal fin pterygiophores. The possible causative agents of the saddleback syndrome in fishes are discussed.

  11. Development of the digestive system in larvae of the Neotropical fish Prochilodus argenteus (Characiformes, Prochilodontidae

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    Alcione Eneida Santos

    2016-01-01

    Full Text Available The development of the digestive system in larvae of the Neotropical fish P. argenteus was analyzed histologically. On the 3rd day after hatching, the digestive system comprised oropharyngeal cavity, esophagus and simple undifferentiated tube. Since secreting cells, positive to Alcian Blue (AB, were found in the esophagus, digestive activity in the initial phase had occurred. On the 18 and 28th days after hatching, the esophagus was positive for AB and Periodic Acid Schiff (PAS stain. The stomach was fully differentiated, with the cardiac, fundic and pyloric regions. Different regions of the epithelium were characterized by basic and acidic secreting cells (AB and PAS positive. On the 18 and 28th days after hatching, the intestine was long, coiled and divided into proximal, middle and distal segments with pyloric ceca. Secreting cells in different regions of the gut were either positive or negative for AB and PAS. Results showed that larvae of P. argenteus exhibited digestive activity on the third day after hatching, with fully differentiated stomach and intestines on the 18 and 28th days and their different regions featuring secreting cells.

  12. B chromosomes in the species Prochilodus argenteus (Characiformes, Prochilodontidae: morphologicalidentity and dispersion

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    Manolo Penitente

    2015-03-01

    Full Text Available B chromosomes have attracted the attention of Neotropical fish cytogeneticists in recent years, both for their remarkable occurrence in this group and also because of the interest in studies of the genetic structure and role played in the genome of these organisms. The aim of this study was to report the first occurrence of supernumerary chromosomes in Prochilodus argenteus (Agassiz, 1829, this being the fifth carrier species among thirteen within the genus Prochilodus (Agassiz, 1829. The extra elements identified in this species are small sized heterochromatic chromosomes characterized by a low mitotic instability index, being very similar to other supernumerary chromosomes described in the species of the genus Prochilodus. Morphology, structure and dispersion of the supernumerary genomic elements which occur in species of this genus are discussed aiming to better understand aspects involved the origin of supernumerary chromosomes and the differentiation process and relationships among species of this family.

  13. B chromosomes in the species Prochilodus argenteus (Characiformes, Prochilodontidae): morphologicalidentity and dispersion

    Science.gov (United States)

    Penitente, Manolo; Foresti, Fausto; Porto-Foresti, Fábio

    2015-01-01

    Abstract B chromosomes have attracted the attention of Neotropical fish cytogeneticists in recent years, both for their remarkable occurrence in this group and also because of the interest in studies of the genetic structure and role played in the genome of these organisms. The aim of this study was to report the first occurrence of supernumerary chromosomes in Prochilodus argenteus (Agassiz, 1829), this being the fifth carrier species among thirteen within the genus Prochilodus (Agassiz, 1829). The extra elements identified in this species are small sized heterochromatic chromosomes characterized by a low mitotic instability index, being very similar to other supernumerary chromosomes described in the species of the genus Prochilodus. Morphology, structure and dispersion of the supernumerary genomic elements which occur in species of this genus are discussed aiming to better understand aspects involved the origin of supernumerary chromosomes and the differentiation process and relationships among species of this family. PMID:25893076

  14. Selection of diet for culture of juvenile silver pomfret, Pampus argenteus

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    Peng, Shiming; Shi, Zhaohong; Yin, Fei; Sun, Peng; Wang, Jiangang

    2012-03-01

    Juvenile silver pomfret, Pampus argenteus, was grown in culture tanks for 9 weeks on four different diets, and their effects on fish growth, digestive enzyme activity, and body composition were assessed. The feeding regime was as follows: Diet 1: fish meat; Diet 2: fish meat+artificial feed; Diet 3: fish meat+artificial feed+Agamaki clam meat; Diet 4: fish meat+artificial feed+Agamaki clam+copepods. The greatest weight gain was associated with Diet 4, while the lowest weight gain was associated with Diet 1. No significant difference was observed in weight gain between fish receiving Diet 2 and Diet 3. Specific growth rate followed similar trends as weight gain. The feed conversion ratio (FCR) of fish fed Diet 1 was significantly higher than the other fish groups, but no significant differences were observed in FCRs of fish fed Diet 2, Diet 3 or Diet 4. There was also no significant difference in the hepatosomatic index (HSI) between the four diets. For fish that received Diets 2-4, containing artificial feed, higher protease activities were detected. A higher lipid content of the experimental diets also significantly increased lipase activities and body lipid content. No significant differences in amylase activity or body protein content were found between Diets 1-4. In conclusion, a variety of food components, including copepods and artificial feed, in the diet of silver pomfret significantly increased digestive enzyme activity and could improve growth performance.

  15. Functional dissimilarity of melanomacrophage centres in the liver and spleen from females of the teleost fish Prochilodus argenteus.

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    Ribeiro, H J; Procópio, M S; Gomes, J M M; Vieira, F O; Russo, R C; Balzuweit, K; Chiarini-Garcia, H; Castro, Antonio Carlos Santana; Rizzo, E; Corrêa, José Dias

    2011-12-01

    Melanomacrophage centres (MMCs) are formed by macrophage aggregates containing pigments such as hemosiderin, melanin and lipofuscin. MMCs are found in animals such as reptiles, amphibians and, mainly, fishes, in organs such as the kidney, spleen, thymus and liver. In teleost fish, several functions have been attributed to MMCs, including the capture and storage of cations, the phagocytosis of cellular debris and immunological reactions. As the use of MMCs has been suggested as a tool for the assessment of environmental impacts, our aim has been to describe the various metabolic processes performed by MMCs in diverse organs (liver and spleen) by using the teleost Prochilodus argenteus as an animal model. MMCs from the liver and spleen were assessed by histochemistry, transmission electron microscopy, scanning electron microscopy, X-ray microanalysis techniques and biochemical assay for N-acetylglucosaminidase activity. The data showed metabolic differences in MMCs between the liver and spleen of P. argenteus in their morphometric characteristics and biochemical and elemental composition. The implications of these findings are discussed, focusing on their role in organ metabolism. PMID:22160458

  16. Migration and spawning of radio-tagged zulega Prochilodus argenteus in a dammed Brazilian river

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    Godinho, Alexandre L.; Kynard, B.

    2006-01-01

    It is difficult for agencies to evaluate the impacts of the many planned dams on Sa??o Francisco River, Brazil, migratory fishes because fish migrations are poorly known. We conducted a study on zulega Prochilodus argenteus, an important commercial and recreational fish in the Sa??o Francisco River, to identify migrations and spawning areas and to determine linear home range. During two spawning seasons (2001-2003), we radio-tagged fish in three main-stem reaches downstream of Tre??s Marias Dam (TMD), located at river kilometer (rkm) 2,109. We tagged 10 fish at Tre??s Marias (TM), which is 5 km downstream of TMD; 12 fish at Pontal, which is 28 km downstream of TMD and which includes the mouth of the Abaete?? River, and 10 fish at Cilga, which is 45 km downstream of TMD. Late-stage (ripe) adults tagged in each area during the spawning season remained at or near the tagging site, except for four Cilga fish that went to Pontal and probably spawned. The Pontal area at the Abaete?? River mouth was the most important spawning site we found. Prespawning fish moved back and forth between main-stem staging areas upstream of the Abaete?? River mouth and Pontal for short visits. These multiple visits were probably needed as ripe fish waited for spawning cues from a flooding Abaete?? River. Some fish homed to prespaw ning staging areas, spawning areas, and nonspawning areas. The migratory style of zulega was dualistic, with resident and migratory fish. Total linear home range was also dualistic, with small (<26-km) and large (53-127-km) ranges. The locations of spawning areas and home ranges suggest that the Pontal group (which includes Cilga fish) is one population that occupies about 110 km. The Pontal population overlaps a short distance with a population located downstream of Cilga. Movements of late-stage TM adults suggest that the TM group is a separate population, possibly with connections to populations upstream of TMD. ?? Copyright by the American Fisheries Society

  17. Description of novel microsatellite loci in the Neotropical fish Prochilodus argenteus and cross-amplification in P. costatus and P. lineatus

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    Anna C.D.R. Barbosa

    2008-01-01

    Full Text Available Prochilodus is one of the most important fish resources of South America, in addition to the important role it plays in nutrient cycling of Neotropical rivers. In the present study, we describe the isolation and characterization of nine novel microsatellite loci in Prochilodus argenteus. The number of alleles per polymorphic locus varied from 5 (Par76 to 21 (Par85, revealing a total of 116 alleles. The values of observed and expected heterozygosities ranged from 0.629 (Par69 to 0.926 (Par85 and Par86 and from 0.643 (Par66 to 0.931 (Par80, respectively. Furthermore, the ability of these and other previously described microsatellite markers to amplify orthologous loci was tested in two related species, Prochilodus costatus and Prochilodus lineatus. These loci will be useful for studies of population genetic structure in this group of fishes, and in aiding future genetic mapping studies of P. argenteus.

  18. A new species of Anacanthoroides and redescription of Apedunculata discoidea (Monogenoidea) parasitizing Prochilodus argenteus (Actinopterygii) from the São Francisco River, Brazil.

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    Monteiro, Cassandra Moraes; Brasil-Sato, Marilia Carvalho

    2014-01-01

    Anacanthoroides sanctifrancisci n. sp. from the gills of 'curimatã-pacú', Prochilodus argenteus from the São Francisco River, Brazil, is described and illustrated. Anacanthoroides, monotypic, is represented by Anacanthoroides mizellei. The new species can be distinguished from A. mizellei by the presence of a pair of muscular pseudosuckers in the anterior region of the body, an accessory piece not articulated to the male copulatory organ and the number of rings in the male copulaty complex. Apedunculata discoidea is redescribed and recorded in the gills of P. argenteus. The generic diagnosis of Apedunculata is amended. Both genera are recorded for the first time in the São Francisco River basin. PMID:24872054

  19. Influence of water temperature on induced reproduction by hypophysation, sex steroids concentrations and final oocyte maturation of the "curimatã-pacu" Prochilodus argenteus (Pisces: Prochilodontidae).

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    Arantes, Fábio P; Santos, Hélio B; Rizzo, Elizete; Sato, Yoshimi; Bazzoli, Nilo

    2011-07-01

    Most fishes with commercial importance from the São Francisco basin are migratory and do not complete the reproductive cycle in lentic environments, such as hydroelectric plant reservoirs, hence natural stocks are declining and there is an urgent need to reduce the pressure of fishing on those wild populations. Therefore, studies on reproductive biology and its relationship with endocrine and environmental factors are key to improving the cultivation techniques of Brazilian fish species. This study examined the influence of water temperature on sex steroid concentrations (testosterone, 17β-estradiol and 17α-hydroxyprogesterone), spawning efficiency, fecundity, fertilisation rate, larval abnormality rates and involvement of the cytoskeleton during the final oocyte maturation of Prochilodus argenteus under experimental conditions. The results of our study showed that in captivity, sex steroid plasma concentrations and spawning performance of P. argenteus were clearly different for fish kept in water with different temperature regimes. In lower water temperature (23°C), it was observed that: 33% of females did not ovulate, fecundity was lower and vitellogenic oocytes after the spawning induction procedure exhibited a smaller diameter. Moreover, concentrations of 17β-estradiol and 17α-hydroxyprogesterone were lower and there was a delay in the final oocyte maturation and, consequently, ovulation and spawning. Our experiments showed direct influence of water temperature in the process of induced spawning of P. argenteus. Changes in water temperature also suggest the tubulin involvement in the nuclear dislocation process and the possible action of actin filaments in the release of polar bodies during final oocyte maturation of P. argenteus. PMID:21501616

  20. Ecological parameters of the endohelminths in relation to size and sex of Prochilodus argenteus (Actinopterygii: Prochilodontidae from the Upper São Francisco River, Minas Gerais, Brazil

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    Cassandra M. Monteiro

    2009-12-01

    Full Text Available This research aimed to investigate the ecological indexes of the helminths of the digestive system and coelom of Prochilodus argenteus Spix & Agassiz, 1829. A total of 150 specimens (53 males and 97 females taken from the upper reaches of the São Francisco River in the municipality of Três Marias (18º12'32"S, 45º15'41"W, State of Minas Gerais, Brazil, were examined. The specimens were collected in July, 2003 and January, 2004. Ninety-eight fish (65.3% were infected by at least one species of helminth. Five helminth species were found: one digenean, Saccocoelioides nanii Szidat, 1954; two Eucestoda, Valipora sp., and one undetermined metacestode; one nematode, Spinitectus asperus Travassos, Artigas & Pereira, 1928; and one acanthocephalan, Neoechinorhynchus prochilodorum Nickol & Thatcher, 1971. The sex of the host did not influence parasite indexes. The total length of the hosts influenced the abundance of S. nanii (r s = -0.21, p = 0.01 and the prevalence of the metacestode (r = -0.91, p = 0.01. Saccocoelioides nanii was the dominant species in the parasite fauna of P. argenteus. Saccocoelioides nanii, Valipora sp., S. asperus and N. prochilodorum are reported here for the first time in P. argenteus and their known distribution is expanded to the São Francisco River.

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

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    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

  2. Occurrence of Larvae and Juveniles of Eucinostomus argenteus, Eucinostomus gula, Menticirrhus americanus, Menticirrhus littoralis, Umbrina coroides and Micropogonias furnieri at Pontal do Sul beach, Paraná

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    Rodrigo Santiago Godefroid

    2001-12-01

    Full Text Available Despite its importance, most ichthyoplankton studies in the South-Southeastern coast of Brazil, have been accomplished on the continental shelf. Regarding the beach environment, recognized as a nursery, little is known about the ichthyoplankton. We analyzed 288 samples collected with a 18 by 2 m seine net, 1 mm mesh and a conical plankton net, with a mesh of 300 mum and a 60 cm mouth. Eucinostomus argenteus comprised 78 % of the larvae and juveniles caught in the samples. The occurrence of gerreids was strongly concentrated in the summer, while the Menticirrhus littoralis, Menticirrhus americanus and Umbrina coroides were present during all seasons. M.littoralis was most abundant during spring, while M. americanus and U. coroides dominated during winter. For all species, the largest captures occurred during low tide. Environmental preferences are indicated in the principal component analysis, with the larvae and juveniles of E. argenteus and E. gula positively correlated with smaller waves and smaller morphodynamism, whereas M. americanus, U. coroides and M. furnieri seem to prefer periods with lower temperatures and larger morphodynamism.Apesar da importância, a maioria dos estudos de ictioplâncton na costa sul-sudeste do Brasil, foram realizados sobre a plataforma continental. No que se refere ao ambiente praial, reconhecido como área de criação, pouco se sabe sobre o ictioplâncton. Foram analisadas 288 amostras coletadas com uma rede tipo picaré com 18 x 2 m e malha de 1mm, e rede de plancton cônica, com malha de 300 mim e boca de 60 cm. A espécie E. argenteus totalizou 78 % das larvas e juvenis capturados. A ocorrência dos gerreideos foi fortemente concentrada no verão, enquanto que Menticirrhus littoralis, Menticirrhus americanus e Umbrina coroides estiveram presentes em todas as estações do ano. M. littoralis foi mais abundante na primavera, enquanto que M. americanus e U. coroides dominaram no inverno. Em todas as esp

  3. Description of novel microsatellite loci in the Neotropical fish Prochilodus argenteus and cross-amplification in P. costatus and P. lineatus

    OpenAIRE

    Anna C.D.R. Barbosa; Felipe Galzerani; Thaís C. Corrêa; Pedro M. Galetti Jr.; Terumi Hatanaka

    2008-01-01

    Prochilodus is one of the most important fish resources of South America, in addition to the important role it plays in nutrient cycling of Neotropical rivers. In the present study, we describe the isolation and characterization of nine novel microsatellite loci in Prochilodus argenteus. The number of alleles per polymorphic locus varied from 5 (Par76) to 21 (Par85), revealing a total of 116 alleles. The values of observed and expected heterozygosities ranged from 0.629 (Par69) to 0.926 (Par8...

  4. Role of HSP70 in the regulation of the testicular apoptosis in a seasonal breeding teleost Prochilodus argenteus from the São Francisco River, Brazil.

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    Domingos, Fabricio F T; Thomé, Ralph G; Martinelli, Patrícia M; Sato, Yoshimi; Bazzoli, Nilo; Rizzo, Elizete

    2013-04-01

    This study investigated the relationship among heat shock protein 70 (HSP70), proliferating cell nuclear antigen (PCNA), and testicular apoptosis during a breeding cycle of Prochilodus argenteus, a neotropical migratory characiform fish of importance in commercial fishery from the São Francisco River basin. A total of 48 (12 fish/sampling) adult males were caught using casting and drifting nets in four samplings from June 2008 to March 2009. Immunohistochemistry, Western blotting, terminal transferase-mediated dUTP nick-end labeling (TUNEL), enzyme-linked immunosorbent assay (ELISA), and caspase-3 colorimetric assay were assessed in different phases of spermatogenesis. Labeling for HSP70 occurred in spermatogonia (SPG(A) 18.0±1.5 and SPGB 27.9±1.0 in 100 mm(2), respectively) and Sertoli cells in all sampling periods, with higher values in June (resting period) while spermatocytes were labeled in September (maturation period) and December (ripe period). For PCNA, immunoreaction was predominant in spermatogonia in June and September, while primary spermatocytes were labeled mainly in December (18.7±2.0). TUNEL-positive reaction occurred throughout the sampling periods, and labeling was detected in the nucleus of germ cells in all developmental phases, except spermatozoa. By ELISA, total HSP70 in testis increased significantly from June to December, and decreased in March (regression period), P<0.05. Caspase-3 activity decreased from June to December and increased in March. Taken together, our results suggest that HSP70 may protect the germ cells from caspase-3-dependent apoptosis during testicular activity and, reduction of HSP70 and increase of apoptosis contribute for testicular remodeling after the breeding season in wild populations of P. argenteus in the São Francisco River. PMID:23362090

  5. Genetic diversity and population structure of Prochilodus costatus and Prochilodus argenteus preceding dam construction in the Paraopeba River, São Francisco River Basin, Minas Gerais, Brazil

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    Jorge A. Dergam; Isabella F. Pena; Carolina C. R. Horta; Flávia F. Siqueira; Bárbara F. Magalhães; Fábio P. Arantes; Tatiana M. Barroca; Evanguedes Kalapothakis

    2012-01-01

    Curimatã-pioa (Prochilodus costatus) and curimatã-pacu (Prochilodus argenteus) are migratory fish species endemic to the São Francisco River Basin in Brazil. Both species play important roles in local fisheries and ecology in the Paraopeba River. A dam was recently constructed on this river and to help in the development and conservation programs, we characterized the genetic variation of both species before dam construction. Complex hypervariable repeats...

  6. Myxobolus franciscoi sp. nov. (Myxozoa: Myxosporea: Myxobolidae), a parasite of Prochilodus argenteus (Actinopterygii: Prochilodontidae) from the Upper São Francisco River, Brazil, with a revision of Myxobolus spp. from South America

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    Jorge C. Eiras; Cassandra M. Monteiro; Marilia C. Brasil-Sato

    2010-01-01

    Myxobolus franciscoi sp. nov. (Myxozoa: Myxosporea: Myxobolidae) is described from the "curimatá-pacú" fish, Prochilodus argenteus Spix & Agassiz, 1829 (Actinopterygii: Prochilodontidae) from the Upper São Francisco River, Brazil. This parasite forms whitish plasmodia (about 1 x 1 mm) that develop in the connective tissue of fins. The spores are more or less round in frontal view and ellipsoidal in lateral view, measuring 6.4 (6.0-6.9) µm in length, by 6.0 (5.8-6.4) µm in width and 3.2 µm in ...

  7. Sex-response differences of immunological and histopathological biomarkers in gill of Prochilodus argenteus from a polluted river in southeast Brazil.

    Science.gov (United States)

    Procópio, Marcela Santos; Ribeiro, Heder José; Pereira, Luciano Almeida; Oliveira Lopes, Gabriel Augusto; Castro, Antônio Carlos Santana; Rizzo, Elizete; Sato, Yoshimi; Russo, Remo Castro; Corrêa, José Dias

    2014-07-01

    The fish gill is in direct and standing contact with the immediate external environment and, therefore, is highly vulnerable to aquatic pollutants. In this study, Prochilodus argenteus were caught at two different points in São Francisco river. The first point is located near Três Marias dam, while the second is placed downstream the Abaeté river. Chemical approaches showed the presence of metals contamination in the first point. Thus, the main goal of this study was to investigate the possible toxic effects of these contaminants and the likely use of biomarkers on fish gills. Biometric data of length and weight of fish were obtained in order to calculate the condition factor as an organismal biomarker. The histological changes in gills and alterations in mucous and rodlet cells occurrence were detected microscopically and evaluated with quantitative analyses. Myeloperoxidase (MPO) and Eosinophil Peroxidase (EPO) were also assessed in fish gill. The analysis of the water and sediment samples revealed the presence of metals at the two points. As and Cd were detected at higher concentrations at point 1. The presence of lamellar cell hyperplasia, lamellar fusion, lamellar edema and inflammatory foci varied according to the point. Additionally, mucous and rodlet cells and MPO and EPO activities showed variability according to the environmental conditions. Furthermore, with exception of lamellar hyperplasia and eosinophil peroxidase activity, all others parameters showed sex-variation responses. At the first point, male fish showed a chronical inflammation in gills due to the lowest activity of MPO and EPO, as well as low occurrence of inflammatory foci and glycoprotein secretion by mucous cells, while female fish presented an opposite pattern of response to the same environmental conditions. Therefore, we suggest the use of such biomarkers in future monitoring of aquatic systems, taking into account the sex-variation responses. PMID:24795082

  8. 冷藏鲳鱼贮藏期间的细菌种群变化%Bacterial Species Changes in Pampus argenteus During Chilled Storage

    Institute of Scientific and Technical Information of China (English)

    蓝蔚青; 谢晶; 施建兵; 周会; 张琛杰

    2013-01-01

    分析了鲳鱼(Pampus argenteus)冷藏期间的感官、pH值、微生物指标及主要细菌种群变化.研究表明,初始样品pH值为7.217±0.015,菌落总数(CFU/g)的对数值为3.967±0.012;初始细菌种类较多,其中45.92%为革兰氏阴性菌,54.08%为革兰氏阳性菌,优势菌为腐生葡萄球菌(Staphylococcus saprophyticus 28.81%)、松鼠葡萄球菌(Staphylococcus sciuri 15.38%)、嗜冷杆菌(Psychrobacter spp.12.09%)、草莓假单胞菌(Pseudomonas fragi 9.02%)、荧光假单胞菌(Pseudomonas fluorescens 8.53%)与腐败希瓦氏菌(Shewanella putrefaciens 6.39%),同时检出一定比例的成团肠杆菌、微杆菌与嗜根库克菌.冷藏过程中,腐生葡萄球菌与松鼠葡萄球菌等生长受到抑制,细菌菌相组成逐渐单一,适应低温环境条件的革兰氏阴性菌比例逐渐增加,在贮藏的第3、5、7天至货架期终点(pH值为8.057±0.005,菌落总数(CFU/g)的对数值为9.137±0.032)时,阴性菌比例分别达到83.82%、95.86%、96.88%与93.57%.其中,假单胞菌与腐败希瓦氏菌增长显著,在贮藏末期比例为45.71%与33.57%,荧光假单胞菌(35.00%)明显多于草莓假单胞菌(10.71%).

  9. Morphological variation in populations of Tetragonopterus argenteus Cuvier, 1817 (Characiformes, Characidae from Madeira and Paraguay river basins Variação morfológica em populações de Tetragonopterus argenteus Cuvier, 1817 (Characiformes, Characidae das bacias dos rios Madeira e Paraguai

    Directory of Open Access Journals (Sweden)

    Willian Massaharu Ohara

    2007-10-01

    Full Text Available The saua Tetragonopterus argenteus is endemic to South America. It has a wide geographic distribution and occurs in different Brazilian basins, such as those of the Madeira and Paraguay rivers. In this work, it was noticed that populations from these basins have morphological variations between them, indicating a possible geographic isolation. Specimens were studied using twelve morphological characters that were submitted to the canonical variates and body proportion analysis. In the canonical variate analysis, the populations from the Madeira and Paraguay river basins were differentiated by caudal peduncle depth, eye diameter, pre-ventral distance, body height, snout length and head length. In the body proportion analysis, the population of Madeira river basin presented head length, orbital diameter, pre-dorsal distance, dorsal-fin length, pre-ventral distance, body height and caudal peduncle height, smaller than those of the population from Paraguay river basin. These results allowed the recognition of intra-specific variation amplitude, that could become an important instrument for management and conservation of this species. O sauá Tetragonopterus argenteus é endêmico da América do Sul, apresenta ampla distribuição geográfica e ocorre em várias bacias brasileiras, entre elas as dos rios Madeira e Paraguai. Neste trabalho foi observado que as populações dessas bacias apresentam variações morfológicas que, provavelmente, representam isolamento geográfico. Exemplares foram estudados através de 12 caracteres morfológicos e submetidos às análises de variáveis canônicas e de proporções corporais. Na análise das variáveis canônicas, as populações das bacias dos rios Madeira e Paraguai diferenciaram-se pelo diâmetro do olho, distância pré-ventral, altura do corpo, comprimento do focinho, altura do pedúnculo caudal e comprimento da cabeça. Na análise das proporções corporais, a população da bacia do rio Madeira

  10. Myxobolus franciscoi sp. nov. (Myxozoa: Myxosporea: Myxobolidae, a parasite of Prochilodus argenteus (Actinopterygii: Prochilodontidae from the Upper São Francisco River, Brazil, with a revision of Myxobolus spp. from South America

    Directory of Open Access Journals (Sweden)

    Jorge C. Eiras

    2010-02-01

    Full Text Available Myxobolus franciscoi sp. nov. (Myxozoa: Myxosporea: Myxobolidae is described from the "curimatá-pacú" fish, Prochilodus argenteus Spix & Agassiz, 1829 (Actinopterygii: Prochilodontidae from the Upper São Francisco River, Brazil. This parasite forms whitish plasmodia (about 1 x 1 mm that develop in the connective tissue of fins. The spores are more or less round in frontal view and ellipsoidal in lateral view, measuring 6.4 (6.0-6.9 µm in length, by 6.0 (5.8-6.4 µm in width and 3.2 µm in thickness. The polar capsules are very small, measuring about 2 µm in length by 1.5 µm in width and ending in a tapered anterior neck. The polar filament makes three turns in a plane at right angles with the longitudinal axis of the spore. Thorough comparisons with the remaining species of Myxobolus Bütschli, 1882 described from South American fish, as well as with almost all species of Myxobolus described so far, are provided. This paper also includes a revision of Myxobolus species from South American fish hosts.

  11. 不同时期鲳鱼冷藏期间优势腐败菌的多样性变化%Diversity of Dominant Spoilage Bacteria in Pomfret (Pampus argenteus) from Different Growing Seasons during Chilled Storage

    Institute of Scientific and Technical Information of China (English)

    蓝蔚青; 谢晶; 周会; 张琛杰

    2015-01-01

    目的:比较分析不同时期冷藏鲳鱼(Pampus argenteus)贮藏期间的感官品质、pH值、微生物指标与主要微生物菌群的变化规律.方法:冷藏(4±1)℃条件下,以感官评定、pH值与菌落总数为品质评价指标,采用聚合酶链式反应(polymerase chain reaction,PCR)扩增结合生理生化鉴定法分别对冬、春两个时期的鲳鱼进行优势腐败菌的变化规律研究.将经细菌培养与分离纯化得到单菌落按其形态特征进行分类,再通过生理生化鉴定与革兰氏染色,初步得到菌落种类,对单菌落进行DNA提取与PCR扩增并测序.结果:冬季样品获得12种菌株,春季样品获得9种菌株.贮藏末期时,冬季样品中优势腐败菌的种类与比例分别为嗜冷杆菌(Psychrobacter spp.)21.51%、草莓假单胞菌(Pseudomonas fragi)16.13%、荧光假单胞菌(Pseudomonas fluorescens)52.68%与热杀索丝菌(Brochothrix thermosphacta)9.68%;春季样品为草莓假单胞菌(Pseudomonas fragi)8.62%、荧光假单胞菌(Pseudomonas fluorescens)64.66%与腐败希瓦氏菌(Shewanella putrefaciens)26.72%.结论:冬、春时期中冷藏鲳鱼贮藏期间优势腐败菌的种类基本一致,以革兰氏阴性菌为主,但在细菌种类与比例上存在差异,冬季样品的微生物种类较春季丰富.贮藏期间,随着荧光假单胞菌所占比例的增加,使腐败希瓦氏菌的生长受到明显抑制.

  12. Distribution and Comparison of Digestive Enzyme Activity of Pampus argenteus in Different Digestive Organs%银鲳不同消化器官中消化酶活性的分布及其比较

    Institute of Scientific and Technical Information of China (English)

    周健恺; 徐善良; 邱成功; 方增冰; 陈苹

    2014-01-01

    为了解野生与养殖条件下银鲳不同消化器官中消化酶活性的分布,比较研究了野生银鲳成鱼和养殖银鲳幼鱼的消化酶(蛋白酶、淀粉酶、脂肪酶)活性.结果表明:(1)成鱼胃中蛋白酶活性最大,为0.47 U·mg-1,侧囊中蛋白酶活性最小,仅有0.05 U·mg-1;成鱼肝中淀粉酶活性最大,为0.08 U·mg-1,直肠最小,为0.01 U·mg-1;肝的脂肪酶活性最大,为10.63 U·mg-1,中肠最小,肝脂肪酶活性约为中肠的9倍.(2)幼鱼三种消化酶活性均为:胃>肝>侧囊,且银鲳幼鱼各消化酶活性总体上高于成鱼,幼鱼胃中蛋白酶活性、淀粉酶活性、脂肪酶活性分别约为成鱼胃的3倍、12倍和1.5倍.(3)银鲳成鱼和幼鱼的A/P值都小于1,且幼鱼各消化器官的A/P值都大于成鱼, A/P值结果表明银鲳为偏肉食性鱼类,野生的成鱼比养殖的幼鱼更适应肉食性.此外,研究还发现银鲳的脂肪酶活性明显高于许多常见海水性鱼类,推断其对脂肪的利用效率较高,可以考虑在银鲳饲料的配制时适当提高饲料中脂肪的比例.%In order to understand the nutritional needs of Pampus argenteus in wild and cultivated conditions, the activity of digestive enzymes (protease, amylase, lipase) of wild adult and cultivated young pomfret in different digestive organs are studied .The results show that: (1) The highest protease activity in stomach is found to be 0.47 U·mg-1, and the lowest in lateral sac is identified to be 0.05 U·mg-1; The highest amylase activity in liver is 0.08 U·mg-1, and the lowest in rectum is 0.01 U·mg-1;The highest Hepatic lipase activity is 10.63 U·mg-1 and is about 9 times as large as midgut. (2) Three digestive enzyme activities of juvenile are in the following ascending order: stomach > liver >lateral sac, and the activity of the digestive enzyme of young pomfret is noted to be generally higher than that of adults. The activities of protease, amylase, lipase of juveniles in stomach

  13. 野生银鲳消化道内潜在产酶益生菌产酶条件的初步研究%On enzyme-production conditions of potential probiotics in digestive tracts of wild Pampus argenteus

    Institute of Scientific and Technical Information of China (English)

    王建建; 施兆鸿; 高权新; 彭士明

    2015-01-01

    采用酶学分析法研究了单因子(温度、pH、发酵时间)变化对野生银鲳(Pampus argenteus)消化道内同时分泌蛋白酶、淀粉酶、纤维素酶和脂肪酶中两种以上的5株菌株产酶活力的影响,即通过测定酶活力的大小找到每株菌最适产酶条件范围。结果显示,在温度31~37℃、pH 7~8、发酵时间3 d的条件下,5株产酶菌的蛋白酶活力最大;在不同温度和pH条件下,5菌株分泌的淀粉酶活力各不相同,但都随发酵时间的延长而增大,3~5 d达最大值;4株分泌纤维素酶的菌株纤维素酶活力受环境影响总体变化不大,在温度31~37℃、酸性条件(pH 5)和发酵时间4 d的条件下为活力最大;2株分泌脂肪酶的菌株在28~31℃、中性(pH 7)、发酵时间1 d条件下其脂肪酶活力最大,最大可接近180 U·mL-1,但活力都随发酵时间而显著下降。结果表明,不同产酶菌所分泌的消化酶活力所需的最适条件有很大不同,了解和掌握银鲳肠道中菌群的产酶条件,对开发潜在产酶益生菌有着积极的作用。%In this study,the effects of single factor variation (temperature,pH and fermentation time)on activities of two or more enzymes,including protease,amylase,cellulose and lipase produced simultaneously by enzyme-producing bacteria in the digestive tract of wild silver pomfret (Pampus argenteus)were measured using the method of enzymatic analysis.The aim is to find the optimum range of fermentation conditions for each strain by measuring the enzyme activity by different media,different incubation temperatures,pH and fermentation time.Results showed that the activities of protease produced by five strains of enzyme-producing bacteria were the highest in the conditions of temperature 3 1 -37 ℃,pH 7 -8 and fermentation time 3 d. The activities of cellulose produced by four cellulose-producing bacteria were not affected significantly by

  14. 人工养殖银鲳子代胚胎发育及仔稚幼鱼形态观察%Observation of embryonic,larval and juvenile development in Pampus argenteus offspring

    Institute of Scientific and Technical Information of China (English)

    施兆鸿; 彭士明; 王建钢; 孙鹏; 尹飞

    2011-01-01

    采用人工培育的子代银鲳(Pampus argentus)为亲本,对银鲳的胚胎及胚后各发育阶段的形态特征进行观察测量,以期为今后苗种培育和繁殖生物学研究提供参考资料.银鲳成熟卵子为端黄卵,单个油球,卵径(1.417±0.063)mm,油球径(0.575±0.031)mm.在水温(20.0±0.5)℃、盐度24±1,pH8.0~8.5条件下,受精卵经36 h孵化出膜.初孵仔鱼在水温19.0~24.0℃、盐度 23±1,pH8.0~8.5、光照2 000~3 000 lx条件下,经60 d培育成幼鱼.银鲳早期发育分前期仔鱼、后期仔鱼、稚鱼和幼鱼,前期仔鱼以卵黄囊吸收消化为主要形态特征;后期仔鱼分化出侧囊、食道、胃、幽门育囊和肝脏等消化器官,外形特征是鱼体腹两侧星状黑色素及金黄色斑点明显,背鳍和臀鳍鳍条原基出现,13日龄仔鱼全长(5.586±0.479)mm,体高((1.068±0.087)mm;稚鱼期消化器官进一步完善,脊索末端向上曲屈,随后尾下骨出现并且尾下骨末端与体轴倾斜,至35日龄尾下骨与体轴垂直,45日龄体高明显增高,全长(25.560±3.870)mm,体高(11.157±1.266)mm.幼鱼期胸鳍前端呈尖形,尾鳍上下两侧生长加快形成深叉状,鳞片完全长成,60 d时全长为(引.000±3.300)mm,体高达(19.750±1.620)mm,此时体形与成鱼已无差别.此外,本研究还对仔稚幼鱼的划分、鲳属鱼类中主要品种胚胎与仔稚鱼发育的异同点以及育苗中容易出现死亡的关键时期进行了分析探讨.%The embryonic, larval and juvenile development of the offspring obtained from cultured silver pomfret (Pampus argenteus) was observed, which contributed to the study of larvae rearing and breeding biology of pomfret.The eggs of silver pomfret were telolecithal, and had only one oil globule.The diameter of egg and oil globule were (1.417 ± 0.063) mm and (0.575 ± 0.031) mm, respectively.The hatching time was about 36 h after fertilization when the first larva was hatched at (20.0 ± 0.5) ℃, salinity 24 ± 1

  15. Proper modified atmosphere packaging for delaying quality changes of pomfret (Pampus argenteus) during chilled storage and prolonging its shelf life%适宜气调包装延缓冷藏鲳鱼品质变化延长货架期

    Institute of Scientific and Technical Information of China (English)

    蓝蔚青; 谢晶; 高志立; 施建兵; 杨胜平; 朱瑞琪; 朱峰

    2014-01-01

    The aim of this work was to study the influence of modified atmosphere packaging (MAP) on the shelf-life of fresh pomfret (Pampus argenteus) during chilled storage and to find the proper atmosphere components of MAP for prolonging the shelf life of pomfret fillets. Fresh pomfret samples were obtained directly from the local fish market and transported to the laboratory with ice immediately. After being gutted, washed, filleted and trimmed in a water-ice mixture, samples were packaged under three different atmosphere components (MAP1, 20%/80% CO2/N2; MAP2, 50%/50%CO2/N2;MAP3, 80%/20%CO2/N2) and the control group was packaged with air (AIR), the initial gas/product ratio was 3:1 in all packages. Packaged pomfret fillets were stored at (4±1)℃and monitored at intervals of 2 days. Samples were assessed by sensory, microbiological (total viable count , TVC) and physico-chemical (total volatile basis nitrogen (TVB-N), K-value, tri-methylamine nitrogen (TMA-N), pH value) evaluation. After 4 days of storage, the groups of MAP and AIR were different significantly (P<0.05) on the values of sensory evaluation, TVC, TVB-N and TMA-N. Fillets packaged with AIR were the first to present signs of degradation reaching rejection threshold values for all evaluated parameters. The shelf life of AIR was only 4-5 days according to sensory assessment, for which the corresponding microbiological assessment was also showed an increased curve. Meanwhile, the increase of pH, TVB-N, K-value and TMA-N values were significantly (P<0.05) delayed in MAP groups when compared to AIR group. In MAP fillets, TVC was lower than 107 CFU/g for a longer period. The results of quality index were showed that the protective effect of MAP, and the MAP3 group (CO2/N2, 80%/20%) could extend the shelf-life of pomfret fillet samples by 6-8 days as compared to the control group. However, the trend of pH value raised up after a decline was not found in MAP groups. The results indicated that examination of p

  16. Medusa consumption and prey selection of silver pomfret Pampus argenteus juveniles

    Science.gov (United States)

    Liu, Chunsheng; Zhuang, Zhimeng; Chen, Siqing; Shi, Zhaohong; Yan, Jingping; Liu, Changlin

    2014-01-01

    The current study explored Aurelia aurita and Rhopilema esculent um consumption by silver pomfret juveniles, as well as their prey selection between the two jellyfish species. Silver pomfret juveniles weighing 1±0.1 g actively preyed on both the species. Their daily A. aurita consumption was 11.6 times their own body weights regardless of the size of A. aurita medusae. Their daily R. esculent um consumption was 13, 9.1, 5, and 4.1 times their own body weights when the R. esculentum medusae were 10, 20, 30, and 40 mm in bell diameter, respectively. The survival rates of the R. esculent um were higher than those of the A. aurita. When the R. esculent um medusae were more than 30 mm in bell diameter, their survival rate exceeded 92%. Silver pomfrets serve as a type of potential predators on A. aurita in coastal waters, and they have little influence on R. esculent um with a size exceeding 30 mm. Besides, A. aurita may be able to be used as fish prey in silver pomfret artificial breeding.

  17. Life on wood - the carnivorous deep-sea mussel Idas argenteus (Bathymodiolinae, Mytilidae, Bivalvia

    DEFF Research Database (Denmark)

    Ockelmann, Kurt W.; Dinesen, Grete E.

    2011-01-01

    Deep-sea mussels associated with sunken wood are less well known in terms of anatomy, biology and evolution than their bathymodioline allies from cold seeps and hydrothermal vents. During the Danish 'Ingolf Expedition' (1895-96) to the Northeast Atlantic, two pieces of pinewood were collected fro...

  18. A new gonad-infecting species of Philometra, P. barnesi sp. n. (Nematoda: Philometridae), from the marine fish Pomadasys argenteus (Haemulidae) off the northern coast of Australia

    Czech Academy of Sciences Publication Activity Database

    Moravec, František; Diggles, B.K.

    2015-01-01

    Roč. 114, č. 11 (2015), s. 4121-4126. ISSN 0932-0113 R&D Projects: GA ČR GBP505/12/G112 Institutional support: RVO:60077344 Keywords : Australia * Dracunculoidea * Marine fish * Nematode parasite Subject RIV: EG - Zoology Impact factor: 2.098, year: 2014

  19. Hematology, micronuclei and nuclear abnormalities in fishes from São Francisco river, Minas Gerais state, Brazil = Hematologia, micronúcleos e anomalias nucleares em peixes do rio São Francisco, Estado de Minas Gerais, Brasil

    OpenAIRE

    Robson Seriani; Maria José Tavares Ranzani-Paiva; Ângela Teresa Silva-Souza; Silvia Roseli Napoleão

    2011-01-01

    This study aimed to determine the variables leukocytary, erythrocytary, frequency of micronuclei and nuclear abnormalities in peripheral erythrocytes of Prochilodus argenteus, Pimelodus maculatus and Myleus micans from São Francisco river basin, Minas Gerais State, during the summer and winter. Thrombocytes, hematocrit and leukocyte of P.argenteus series, was influenced by climatic conditions. In P. maculatus, not were significant differences for all leukocytes and thrombocytes. In M. micans,...

  20. Hematology, micronuclei and nuclear abnormalities in fishes from São Francisco river, Minas Gerais state, Brazil - doi: 10.4025/actascibiolsci.v33i1.7117 Hematology, micronuclei and nuclear abnormalities in fishes from São Francisco river, Minas Gerais state, Brazil - doi: 10.4025/actascibiolsci.v33i1.7117

    OpenAIRE

    Silvia Roseli Napoleão; Maria José Tavares Ranzani-Paiva; Ângela Teresa Silva-Souza; Robson Seriani

    2011-01-01

    This study aimed to determine the variables leukocytary, erythrocytary, frequency of micronuclei and nuclear abnormalities in peripheral erythrocytes of Prochilodus argenteus, Pimelodus maculates and Myleus micans from São Francisco river basin, Minas Gerais State, during the summer and winter. Thrombocytes, hematocrit and leukocyte of P.argenteus series, was influenced by climatic conditions. In P. maculatus, not were significant differences for all leukocytes and thrombocytes. In M. micans,...

  1. Comparative Studies of Food Habits and Digestive Tracts in Two Apodemus Species

    OpenAIRE

    SHIOYA, Katsunori; Mori, Takayuki; Shiraishi, Satoshi

    1994-01-01

    Feeding experiments using three pairs of food items, analysis of the scaling of digestive organs and microscopic observation were examined in two woodland rodent species, Apodemus argenteus and A. speciosus. Comparing the values of selective indices between acorns and three species of insects, it was shown that A. argenteus has more intensive preference to insects than does A. speciosus. Both the mean ratio of the caecum length to stomach and intestine length (CL/TL) and the ratio of caecum l...

  2. Hematology, micronuclei and nuclear abnormalities in fishes from São Francisco river, Minas Gerais state, Brazil - doi: 10.4025/actascibiolsci.v33i1.7117 Hematology, micronuclei and nuclear abnormalities in fishes from São Francisco river, Minas Gerais state, Brazil - doi: 10.4025/actascibiolsci.v33i1.7117

    Directory of Open Access Journals (Sweden)

    Silvia Roseli Napoleão

    2011-02-01

    Full Text Available This study aimed to determine the variables leukocytary, erythrocytary, frequency of micronuclei and nuclear abnormalities in peripheral erythrocytes of Prochilodus argenteus, Pimelodus maculates and Myleus micans from São Francisco river basin, Minas Gerais State, during the summer and winter. Thrombocytes, hematocrit and leukocyte of P.argenteus series, was influenced by climatic conditions. In P. maculatus, not were significant differences for all leukocytes and thrombocytes. In M. micans, values are unprecedented in the literature, with MCV and absolute number of leukocytes found superior to other species of the family Characidae. The frequency of micronuclei and nuclear abnormalities in erythrocytes, the three species not showed seasonal differences between the sites. However, the highest values were found in summer. Furthermore, we observed a positive correlation between the increase in the percentage of micronuclei with nuclear abnormalities.This study aimed to determine the variables leukocytary, erythrocytary, frequency of micronuclei and nuclear abnormalities in peripheral erythrocytes of Prochilodus argenteus, Pimelodus maculates and Myleus micans from São Francisco river basin, Minas Gerais State, during the summer and winter. Thrombocytes, hematocrit and leukocyte of P.argenteus series, was influenced by climatic conditions. In P. maculatus, not were significant differences for all leukocytes and thrombocytes. In M. micans, values are unprecedented in the literature, with MCV and absolute number of leukocytes found superior to other species of the family Characidae. The frequency of micronuclei and nuclear abnormalities in erythrocytes, the three species not showed seasonal differences between the sites. However, the highest values were found in summer. Furthermore, we observed a positive correlation between the increase in the percentage of micronuclei with nuclear abnormalities.

  3. Karyotypic conservatism in five species of Prochilodus (Characiformes, Prochilodontidae) disclosed by cytogenetic markers

    OpenAIRE

    Tatiana Aparecida Voltolin; Manolo Penitente; Bruna Bueno Mendonça; José Augusto Senhorini; Fausto Foresti; Fábio Porto-Foresti

    2013-01-01

    The family Prochilodontidae is considered a group with well conserved chromosomes characterized by their number, morphology and banding patterns. Thence, our study aimed at accomplishing a cytogenetic analysis with conventional methods (Giemsa staining, silver staining of the nucleolus organizer regions-AgNOR, and C-banding) and fluorescence in situ hybridization (FISH) with 18S and 5S ribosomal DNA probes in five species of the Prochilodus genus (Prochilodus argenteus, Prochilodus brevis, Pr...

  4. Permanent genetic resources added to molecular ecology resources database 1 October 2012-30 November 2012.

    Science.gov (United States)

    Aksoy, Serap; Almeida-Val, Vera Maria F; Azevedo, V C R; Baucom, Regina; Bazaga, Pilar; Beheregaray, L B; Bennetzen, Jeffrey L; Brassaloti, Ricardo A; Burgess, Treena I; Caccone, Adagisa; Chang, Shu-Mei; Ciampi, A Y; Ciancaleoni, S; Clímaco, Gisele T; Clouet, Cécil; Coimbra, Maria R M; Coutinho, Luiz L; Dantas, Hozana L; De Vega, Clara; Echodu, Richard; Enyaru, John; Figueira, Antonio; Filho, Manoel A G; Foltz, Britnie; Fressigné, L; Gadomski, Mateusz; Gauthier, Nathalie; Herrera, Carlos M; Hyseni, Chaz; Jorge, Erika C; Kaczmarczyk, Dariusz; Knott, Emily; Kuester, Adam; Lima, Ana P S; Lima, Maíra A; Lima, Marcos P; Longo, Ana Luiza B; Lor, Grant; Maggioni, Rodrigo; Marques, Thiago S; Martins, Aline R; Matoso, Daniele A; Medrano, Mónica; Mendonça, M A C; Mettler, Raeann; Nascimento, Priscila Roberta M; Negri, V; Oliveira, Karine K C; Oliveira, L O; Ovcarenko, Irina; Paula-Silva, Maria N; Raggi, L; Sandoval-Castillo, J; Santos, Carlos Henrique Dos Anjos; Martin Schaefer, H; Segelbacher, Gernot; Seino, Miyuki M; Sistrom, Mark; Taole, Matsepo M; Teske, P R; Tsagkarakou, Anastasia; Verdade, Luciano M; Villela, Priscilla M S; Vinson, C C; Wingfield, Brenda D; Wingfield, Michael J

    2013-03-01

    This article documents the addition of 153 microsatellite marker loci to the Molecular Ecology Resources Database. Loci were developed for the following species: Brassica oleracea, Brycon amazonicus, Dimorphandra wilsonii, Eupallasella percnurus, Helleborus foetidus, Ipomoea purpurea, Phrynops geoffroanus, Prochilodus argenteus, Pyura sp., Sylvia atricapilla, Teratosphaeria suttonii, Trialeurodes vaporariorum and Trypanosoma brucei. These loci were cross-tested on the following species: Dimorphandra coccicinea, Dimorphandra cuprea, Dimorphandra gardneriana, Dimorphandra jorgei, Dimorphandra macrostachya, Dimorphandra mollis, Dimorphandra parviflora and Dimorphandra pennigera. PMID:23356940

  5. Spatial and temporal patterns and their influence on fish community at Itupararanga Reservoir, Brazil.

    Science.gov (United States)

    Smith, Welber Senteio; Petrere, Miguel

    2008-12-01

    The Itupararanga Reservoir is located at the Sorocaba River Basin, São Paulo State, Brazil. Five cities use the waters of this reservoir for human consumption. Despite this intensive use of the water resource, no study has been undertaken on the ichthyofauna of this reservoir. Collections were performed in nine sampling stations, where each three were located in the riverine, transitional and lacustrine zones. Fish specimens were collected using eight monofilament gillnets of 10 m length each, with varied mesh sizes, in the rainy and dry seasons, which corresponded to our spatial scale of analysis. Overall, 14 species of fish were identified, with the highest contribution from Characidae and Curimatidae. The most abundant species were: the "lambari", Astyanax fasciatus, the "saguiru", Cyphocharax modestus, the "lambari bocarra", Oligosarcus paranaensis, and the "mandi", Iheringichthys labrosus. Diversity tended to be higher during the dry season, although the difference was not statistically significant. Cluster analysis identified four season sampling groups differentiated by within-season distribution of species. Mantel's test showed that this distribution was little affected by environmental factors, suggesting that biotic factors were more important in determining the species distribution within the reservoir. PMID:19419097

  6. Hematology, micronuclei and nuclear abnormalities in fishes from São Francisco river, Minas Gerais state, Brazil = Hematologia, micronúcleos e anomalias nucleares em peixes do rio São Francisco, Estado de Minas Gerais, Brasil

    Directory of Open Access Journals (Sweden)

    Robson Seriani

    2011-01-01

    Full Text Available This study aimed to determine the variables leukocytary, erythrocytary, frequency of micronuclei and nuclear abnormalities in peripheral erythrocytes of Prochilodus argenteus, Pimelodus maculatus and Myleus micans from São Francisco river basin, Minas Gerais State, during the summer and winter. Thrombocytes, hematocrit and leukocyte of P.argenteus series, was influenced by climatic conditions. In P. maculatus, not were significant differences for all leukocytes and thrombocytes. In M. micans, values are unprecedented in the literature, with MCV and absolute number of leukocytes found superior to other species of the family Characidae. The frequency of micronuclei and nuclear abnormalities in erythrocytes, the three species not showed seasonal differences between the sites. However, the highest values were found in summer. Furthermore, we observed a positive correlation between the increase in the percentage of micronuclei with nuclear abnormalities.O presente estudo teve como objetivo, determinar as variáveis leucocitárias, eritrocíticas, freqüência de micronúcleos e anomaliasnucleares nos eritrócitos do sangue periférico de Prochilodus argenteus, Pimelodus maculatus e Myleus micans de um trecho da bacia do rio São Francisco, Minas Gerais, no verão e inverno. Trombóctios, hematócrito e a serie leucocítária de P.argenteus, foi influenciado pela sazonalidade. Em P. maculatus, não ocorreram diferenças significativas para todos os leucócitos e trombócitos. Em M. micans, os valores são inéditos na literatura, apresentando VCM e número absoluto de leucócitos superior ao encontrados para outras espécies dafamília Characidae. A freqüência de micronúcleos e de anomalias nucleares nos eritrócitos, nas três espécies não apresentou diferenças sazonais e entre os pontos amostrais. No entanto, os valores mais altos foram encontrados no verão. Além disso, foi possível observar correlação positiva entre o aumento da

  7. 東支那海海産魚類の肉中総水銀濃度

    OpenAIRE

    有馬, 純宏; 有馬, 郷司; アリマ, スミヒロ; アリマ, サトシ; ARIMA, Sumihiro; ARIMA, Satoshi

    1985-01-01

    In order to estimate mercury background level of fish in East China Sea, total mercury concentration of muscles of nineteen fish species is analysed. Highest value was 0.54 ppm in Sebastes inermis, and lowest one was 0.016 ppm in Pampus argenteus. Average of average mercury concentration of 19 species was 0.087 ppm. Among species Sebastes inermis has the highest average mercury concentration (0.32 ppm), and Psenopsis anomala has the lowest one (0.023 ppm). While seven carnivorous ...

  8. 東支那海海産魚類の肉中総水銀濃度

    OpenAIRE

    有馬, 純宏; 有馬, 郷司; アリマ, スミヒロ; アリマ, サトシ; ARIMA, Sumihiro; ARIMA, Satoshi

    1985-01-01

    In order to estimate mercury background level of fish in East China Sea, total mercuryconcentration of muscles of nineteen fish species is analysed. Highest value was 0.54 ppm inSebastes inermis, and lowest one was 0.016 ppm in Pampus argenteus. Average of average mercuryconcentration of 19 species was 0.087 ppm. Among species Sebastes inermis has the highestaverage mercury concentration (0.32 ppm), and Psenopsis anomala has the lowest one (0.023 ppm). While seven carnivorous species have hig...

  9. Karyotypic conservatism in five species of Prochilodus (Characiformes, Prochilodontidae) disclosed by cytogenetic markers.

    Science.gov (United States)

    Voltolin, Tatiana Aparecida; Penitente, Manolo; Mendonça, Bruna Bueno; Senhorini, José Augusto; Foresti, Fausto; Porto-Foresti, Fábio

    2013-09-01

    The family Prochilodontidae is considered a group with well conserved chromosomes characterized by their number, morphology and banding patterns. Thence, our study aimed at accomplishing a cytogenetic analysis with conventional methods (Giemsa staining, silver staining of the nucleolus organizer regions-AgNOR, and C-banding) and fluorescence in situ hybridization (FISH) with 18S and 5S ribosomal DNA probes in five species of the Prochilodus genus (Prochilodus argenteus, Prochilodus brevis, Prochilodus costatus, Prochilodus lineatus and Prochilodus nigricans) collected from different Brazilian hydrographic basins. The results revealed conservatism in chromosome number, morphology, AgNORs 18S and 5S rDNAs location and constitutive heterochromatin distribution patterns. The minor differences observed in this work, such as an Ag-NOR on a P. argenteus chromosome and a distinct C-banding pattern in P. lineatus, are not sufficient to question the conservatism described for this group. Future work using repetitive DNA sequences as probes for FISH will be interesting to further test the cytogenetic conservatism in Prochilodus. PMID:24130441

  10. 210Pb: bioaccumulation factor and internal radiation dose to the public due to consumption of seafood from Mumbai harbour bay

    International Nuclear Information System (INIS)

    Marine organisms such as fishes, molluscs and crustaceans are known to accumulate 210Pb. Distribution of 210Pb in coastal marine organisms mainly fishes and shell fishes is studied. Concentration of 210Pb obtained in muscle of common fishes (edible portion) varied from BDL to 9.71 ± 0.92 Bq kq-1 wet muscle. For fishes like Pampus argenteus (pomfret), Cynoglossus elongatus (sole), Rastrelliger kanagurta (mackerel), Harpoden nehereus (Bombay duck), Arius dussumieri (catfish), the concentration factors for 210Pb in edible portion of fish from sea water works out to 101 to 103. Radiation dose to the public has been evaluated on the basis of daily intake of 40 g of fish (15 kg y-1). Committed effective dose (CED) to 210Pb due to consumption of seafood is calculated, CED varied from 2.5 x 10-3 to 1.27 x 10-1 mSv y-1. (author)

  11. [Host plants of Aphis gossypii (Aphididae), vector of virus of Cucumis melo melon (Cucurbitaceae) in Costa Rica].

    Science.gov (United States)

    Sánchez, M V; Agüero, R; Rivera, C

    2001-03-01

    Plant species associated with commercial melon crops and surrounding areas were examined to identity the natural host plants of Aphis gossypii Glover. The study was conducted in two farms located in different melon production areas and plant life zones of Costa Rica. Plant species diversity, percent coverage and distribution over time were recorded during one year. Differences between locations were observed. A total of 86 plant species (49 families) and 72 plant species (40 families) were identified associated to the crop in farms A and B, respectively. In both farms a total of 24 species plants (16 families) were colonized by A. gossypii and 16 (10 families) are new reports of host plant species for this aphid. The new reports are: Justicia comata, Tetramerium nervosum, Alternanthera pubiflora, Cassia massoni, C. reticulata, Cleome viscosa, C. spinosa, Croton argenteus, Caperonia palustris, Chamaesyce gyssopilopia, Phyllantus amarus, Sida decumbens, Ludwigia erecta, Passiflora foetida, Guazuma ulmifolia and Corchorus orinocensis. PMID:11795159

  12. Taxonomy of Pimelodus brevis Marini, Nichols & La Monte, 1933 (Siluriformes: Pimelodidae, an uncertain species from the rio Paraná basin

    Directory of Open Access Journals (Sweden)

    Marcelo Salles Rocha

    2014-12-01

    Full Text Available Pimelodus brevisMarini, Nichols & La Monte, 1933 was described from the río de la Plata, Departamento San Fernando, Argentina, based only on the holotype, which is missing since 1960s. This species has been cited in the literature and is considered valid despite of no voucher specimen has been found in museum. A taxonomic analysis comprising material from the rio Paraná basin provided additional specimens that made it possible to demonstrate the identity of P. brevis. Based on the original description and illustration of the holotype, we performed an allometric analysis and then we were able to compare the data with the similar sympatric congeners. Those comparisons allowed us to conclude that P. brevisis a junior synonym of P. argenteusPerugia, 1891, described from the río Paraná, Colonia Resistencia, Argentina. Comments on the status of congeners and taxonomic recommendations are provided.

  13. A review of the status and development of Kuwait's fisheries.

    Science.gov (United States)

    Al-Husaini, M; Bishop, J M; Al-Foudari, H M; Al-Baz, A F

    2015-11-30

    The status of Kuwait's fisheries landings and relative abundance for major species was reviewed using research data from Kuwait Institute for Scientific Research and landing data from the Kuwait's Central Statistical Bureau. Landing data showed significant decreases for major commercial species such as zobaidy (Pampus argenteus), suboor (Tenualosa ilisha), hamoor (Epinephelus coioides), newaiby (Otolithes ruber) and hamra (Lutjanus malabaricus) while abundance data for the shrimp Penaeus semisulcatus showed significant reduction in the recent years mainly because of overfishing. The catch-rate data showed continuous decline for major species such as zobaidy, newaiby and hamoor, which indicate that stock abundances of these species are low. The reduction in stock abundance in context with changes in habitat quality, particularly the effects of reduced discharge of the Shatt Al-Arab, is discussed. PMID:26233306

  14. Two Taenia species found in Japan, with new distribution record of Taenia polyacantha Leuckart, 1856 (Cestoda: Taeniidae).

    Science.gov (United States)

    Ihama, Y; Sato, H; Makino, Y; Kamiya, H

    2000-02-01

    In an epidemiological survey for Echinococcus multilocularis in rodents and insectivores from the northernmost part of the central mainland of Japan (Honshu), two taeniid species, Taenia crassiceps and Taenia polyacantha, were found in Microtus montebelli and Apodemus argenteus, respectively. The latter is the first record of distribution in Japan, and the former is the second after its first recovery from the central part of Japan. Although we have found neither larval nor strobilar stage of E. multilocularis there, discovery of these taeniid species, having overlapping global distribution with E. multilocularis in red foxes Vulpes vulpes as well as multiple occurrences of hydatid patients having no history of visits to the endemic areas shows the possibility that the life-cycle of E. multilocularis might be maintained at least in the northernmost part of Honshu. PMID:10725694

  15. Ictiofauna and fishing in the surroundines of Penedo, Alagoas

    Directory of Open Access Journals (Sweden)

    Emerson Carlos Soares

    2011-02-01

    Full Text Available Twenty-eight months of data collection revealed the profile of fishing production in the region of lower São Francisco. Catches consist of up to approximately 22 species, of which five are the most common: Prochilodus argenteus, Leporinus spp., Anchoviella vaillantii, Centropomus spp. and Eugerres brasilianus. The fishing fleet that is active in the region is made up of non-motorized canoes, motorized canoes and boats, and the vast majority employ the most common types of fishing nets and other fishing gear. The CPUE (Catch per Unit Effort ranged from 2.5kg/fisherman/day to 4.5kg/fisherman/day during the months analyzed.

  16. 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

  17. Trophic organisation and predator-prey interactions among commercially exploited demersal finfishes in the coastal waters of the southeastern Arabian Sea

    Science.gov (United States)

    Abdurahiman, K. P.; Nayak, T. H.; Zacharia, P. U.; Mohamed, K. S.

    2010-05-01

    Trophic interactions in commercially exploited demersal finfishes in the southeastern Arabian Sea of India were studied to understand trophic organization with emphasis on ontogenic diet shifts within the marine food web. In total, the contents of 4716 stomachs were examined from which 78 prey items were identified. Crustaceans and fishes were the major prey groups to most of the fishes. Based on cluster analysis of predator feeding similarities and ontogenic diet shift within each predator, four major trophic guilds and many sub-guilds were identified. The first guild 'detritus feeders' included all size groups of Cynoglossus macrostomus, Pampus argenteus, Leiognathus bindus and Priacanthus hamrur. Guild two, named 'Shrimp feeders', was the largest guild identified and included all size groups of Rhynchobatus djiddensis and Nemipterus mesoprion, medium and large Nemipterus japonicus, P. hamrur and Grammoplites suppositus, small and medium Otolithes cuvieri and small Lactarius lactarius. Guild three, named 'crab and squilla feeders', consisted of few predators. The fourth trophic guild, 'piscivores', was mainly made up of larger size groups of all predators and all size groups of Pseudorhombus arsius and Carcharhinus limbatus. The mean diet breadth and mean trophic level showed strong correlation with ontogenic diet shift. The mean trophic level varied from 2.2 ± 0.1 in large L. bindus to 4.6 ± 0.2 in large Epinephelus diacanthus and the diet breadth from 1.4 ± 0.3 in medium P. argenteus to 8.3 ± 0.2 in medium N. japonicus. Overall, the present study showed that predators in the ecosystem have a strong feeding preference for the sergestid shrimp Acetes indicus, penaeid shrimps, epibenthic crabs and detritus.

  18. Comparative morphology of the oocyte surface and early development in four characiformes from the São Francisco River, Brazil.

    Science.gov (United States)

    Honorato-Sampaio, Kinulpe; Prado, Paula Suzanna; Sato, Yoshimi; Bazzoli, Nilo; Rizzo, Elizete

    2015-10-01

    Early development from the egg fertilization to complete resorption of the yolk-sac is a critical period in the life cycle of teleost fish. Knowledge of this process provides essential parameters for aquaculture and identification of spawning sites in the wild. In the present study, a comparative morphological analysis of the oocyte surface as well as early development was performed in four commercially valuable species from the São Francisco River: Brycon orthotaenia, Leporinus obtusidens, Prochilodus argenteus, and Salminus franciscanus. Stripped oocytes, embryo, and yolk-sac larvae were analyzed by scanning electron microscopy (SEM) and histology. A set of 10 lectins was used for investigation of lectin-binding pattern in oocytes. In the four species, the outer layer of the zona radiata reacted to most lectins, indicating complex polysaccharides at the oocyte surface while no reactivity was detected in the inner zona radiata and yolk globules. Typical structural arrangements were recognized at the micropylar region by SEM. The four species showed nonadhesive eggs, short embryonic period (18-20 h at 24 ± 1°C), and poorly developed larvae at hatching. At 24 h posthatching (hph), larvae of the four species had neuromasts on the body surface. Rudimentary cement glands for larval attachment were identified on the cephalic region at 24 and 48 hph in B. orthotaenia and S. franciscanus, and following they were in regression. The time for whole yolk resorption varied among species from 48 to 120 hph, occurring earlier in S. franciscanus, followed by B. orthotaenia, P. argenteus, and L. obtusidens. The formation of the digestive tract and the mouth opening indicated initiation of exogenous feeding 24 h before complete resorption of the yolk. Together, our data indicate similarities in the early development among species that may be related to the life cycle strategies and phylogeny. PMID:26194086

  19. Influência da biomassa inicial sobre o crescimento e a produtividade de peixes em sistema de policultivo Effects of initial biomass on fish growth and fishery productivity in polyculture systems

    Directory of Open Access Journals (Sweden)

    Zélia Maria Pimentel Nunes

    2006-12-01

    Full Text Available Analisou-se o crescimento dos peixes, a composição das espécies e a produtividade de quatro policultivos (P75, P78, P87 e P207, visando melhorar o manejo e a produtividade pesqueira dos pequenos açudes (0,1-5,0ha do Semi-Árido brasileiro. Simulou-se as condições desses açudes em viveiros com 120 e 5.000 m² de área, sem renovação de água, utilizando moderada quantidade de adubo e fertilizante. A biomassa inicial variou de 75 a 207kg ha-1, sendo formada por: tilápia do Nilo (Oreochromis niloticus, curimatã pacu (Prochilodus argenteus, carpa comum (Cyprinus carpio, tambaqui (Colossoma macropomum e tucunaré (Cichla ocellaris. Os peixes apresentaram baixo crescimento (The analysed species composition, fish growth, and productivity of four polycultures (P75, P78, P87, and P207 with the objective to improve the small reservoir (0.1-5 ha fishery management and productivity in the Brazilian semiarid region were conducted a experiment. To mimic reservoir conditions, we used 120 and 5,000m² ponds and evaporation and infiltration water loss was replaced. In addition, manure and fertilizers were used only moderately. The initial biomass of Nile tilapia Oreochromis niloticus, 'tambaqui' Colossoma macropomum, 'curimatã pacu' Prochilodus argenteus, common carp Cyprinus carpio, and 'tucunaré' Cichla ocellaris ranged from 75 to 207kg ha-1. The fish showed low growth rates (<0.01g g-1 d-1 after 75 days of culture (P78 and P87. Tambaqui, tilapia, and curimatã growth decreased after 53 days (P75. In moderate biomass, tambaqui grew less than carp and curimatã did (P207. Tilapia productivity reached 720kg ha-1yr-1 (P78 and fell to 220kg ha-1yr-1 because of the reproductive process (P75 and P207. The carp productivity of 1,600kg.ha-1yr-1 was higher than those of the other fish (P87. The 75kg.ha-1 biomass level (60:30:4:3:3% of tilapia, tambaqui, carp, curimatã, and tucunaré, respectively optimized fish growth and productivity. The use of

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

    Directory of Open Access Journals (Sweden)

    Stephen S. Curran

    2008-08-01

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

  1. Study on biogenic amines in various dry salted fish consumed in China

    Science.gov (United States)

    Wu, Yanyan; Chen, Yufeng; Li, Laihao; Yang, Xianqing; Yang, Shaoling; Lin, Wanling; Zhao, Yongqiang; Deng, Jianchao

    2016-05-01

    This study was carried out to investigate the biogenic amines (BAs), physicochemical property and microorganisms in dry salted fish, a traditional aquatic food consumed in China. Forty three samples of dry salted fish were gathered from retail and wholesale markets and manufacturers, which had been produced in various regions in China. Cadaverine (CAD) and putrescine (PUT) were quantitatively the most common biogenic amines. About 14% of the samples exceeded the histamine content standards established by the FDA and/or EU. The highest histamine content was found in Silver pomfret (Pampus argenteus) (347.79 mg kg-1). Five of forty three samples exceeded the acceptable content of TYR (100 mg kg-1), and 23.26% of dried-salted fish contained high contents of biogenic amines (above 600 mg kg-1). In addition, species, regions, pickling processes and drying methods made the physicochemical property, microorganisms and biogenic amines in dry salted fish to be different to some extents. The total plate count (TPC) was much higher than that of total halophilic bacteria in all samples. The biogenic amines, physicochemical property and microbiological counts exhibited large variations among samples. Furthermore, no significant correlation between biogenic amines and physicochemical property and TPC was observed. This study indicated that dry salted fish may still present healthy risk for BAs, depending on the processing methods, storage conditions among others.

  2. Study on biogenic amines in various dry salted fish consumed in China

    Science.gov (United States)

    Wu, Yanyan; Chen, Yufeng; Li, Laihao; Yang, Xianqing; Yang, Shaoling; Lin, Wanling; Zhao, Yongqiang; Deng, Jianchao

    2016-08-01

    This study was carried out to investigate the biogenic amines (BAs), physicochemical property and microorganisms in dry salted fish, a traditional aquatic food consumed in China. Forty three samples of dry salted fish were gathered from retail and wholesale markets and manufacturers, which had been produced in various regions in China. Cadaverine (CAD) and putrescine (PUT) were quantitatively the most common biogenic amines. About 14% of the samples exceeded the histamine content standards established by the FDA and/or EU. The highest histamine content was found in Silver pomfret ( Pampus argenteus) (347.79 mg kg-1). Five of forty three samples exceeded the acceptable content of TYR (100 mg kg-1), and 23.26% of dried-salted fish contained high contents of biogenic amines (above 600 mg kg-1). In addition, species, regions, pickling processes and drying methods made the physicochemical property, microorganisms and biogenic amines in dry salted fish to be different to some extents. The total plate count (TPC) was much higher than that of total halophilic bacteria in all samples. The biogenic amines, physicochemical property and microbiological counts exhibited large variations among samples. Furthermore, no significant correlation between biogenic amines and physicochemical property and TPC was observed. This study indicated that dry salted fish may still present healthy risk for BAs, depending on the processing methods, storage conditions among others.

  3. Effects of a nuclear power plant thermal discharge on habitat complexity and fish community structure in Ilha Grande Bay, Brazil.

    Science.gov (United States)

    Teixeira, Tatiana Pires; Neves, Leonardo Mitrano; Araújo, Francisco Gerson

    2009-10-01

    Fish communities and habitat structures were evaluated by underwater visual censuses a rocky location impacted by thermal discharge (I) and at two control locations, one in a Sargassum bed (C1) and the other in a rocky shore with higher structural complexity (C2). Habitat indicators and fish communities exhibited significant differences between the impacted and control locations, with the impacted one showing a significant decrease in fish species richness and diversity, as well as a decrease in benthic cover. At the I location, only 13 fish species were described, and the average water temperature was 32+/-0.4 degrees C, compared with 44 species at C1 (25.9+/-0.3 degrees C) and 33 species at C2 (24.6+/-0.2 degrees C). Significant differences in fish communities among locations were found by ANOSIM with Eucinostomus argenteus, Mugil sp. and Haemulon steindachneri typical of location I, while Abudefduf saxatilis, Stegastes fuscus and Malacoctenus delalandi were typical of the control locations. Our study shows that thermal pollution alters benthic cover and influences fish assemblages by altering composition and decreasing richness. PMID:19573906

  4. Zinc and copper bioaccumulation in fish from Laizhou Bay, the Bohai Sea

    Science.gov (United States)

    Liu, Jinhu; Cao, Liang; Huang, Wei; Zhang, Chuantao; Dou, Shuozeng

    2014-05-01

    Zinc (Zn) and copper (Cu) concentrations were determined in the tissues (muscle, stomach, liver, gills, skin, and gonads) of five commercial fish species (mullet Liza haematocheilus, flathead Platycephalus indicus, mackerel Scomberomorus niphonius, silver pomfret Pampus argenteus, and sea bass Lateolabrax japonicus) from Laizhou Bay in the Bohai Sea. Metal bioaccumulation was highest in the metabolically active tissues of the gonads and liver. Bioconcentration factors for Zn were higher in all tissues (gonads 44.35, stomach 7.73, gills 7.72, liver 5.61, skin 4.88, and muscle 1.63) than the corresponding values for Cu (gonads 3.50, stomach 3.00, gills 1.60, liver 5.43, skin 1.50, and muscle 0.93). Mackerel tissues accumulated metal to higher concentrations than did other fish species, but bioaccumulation levels were not significantly correlated with the trophic levels of the fish. Zn and Cu concentrations in the tissues were generally negatively correlated with fish length, except for a few tissues of sea bass. Risk assessment based on national and international permissible limits and provisional tolerances for weekly intake of Zn and Cu revealed that the concentrations of these two metals in muscle were relatively low and would not pose hazards to human health.

  5. Species-and tissue-specific mercury bioaccumulation in five fish species from Laizhou Bay in the Bohai Sea of China

    Institute of Scientific and Technical Information of China (English)

    LIU Jinhu; CAO Liang; HUANG Wei; DOU Shuozeng

    2013-01-01

    Mercury (Hg) concentrations in the tissues (muscle,stomach,liver,gills,skin,and gonads)of five fish species (mullet Liza haematocheilus,flathead fish Platycephalus indicus,sea bass Lateolabrax japonicus,mackerel Scomberomorus niphonius and silver pomfret Pampus argenteus) collected from Laizhou Bay in the Bohai Sea of China were investigated.The results indicate that Hg bioaccumulation in the five fish was tissue-specific,with the highest levels in the muscle and liver,followed by the stomach and gonads.The lowest levels were found in the gills and skin.Fish at higher trophic levels (flathead fish and sea bass) exhibited higher Hg concentrations than consumers at lower trophic levels.Mercury bioaccumulation tended to be positively correlated with fish length in mullet,silver pomfret,mackerel,and flathead fish,but was negatively correlated with fish length in sea bass.The Hg concentrations in the muscles of all fish species in Laizhou Bay were within the permissible limits of food safety set by national and international criteria.However,the suggesting maximum consumption of sea bass is 263 g per week for human health.

  6. Apoptosis, cell proliferation and vitellogenesis during the folliculogenesis and follicular growth in teleost fish.

    Science.gov (United States)

    Thomé, R G; Domingos, F F T; Santos, H B; Martinelli, P M; Sato, Y; Rizzo, E; Bazzoli, N

    2012-02-01

    Aiming to better understand folliculogenesis, this study evaluated cell death and proliferation of ovarian cells, besides cathepsin-D expression in Prochilodus argenteus captured in two sites of the São Francisco River downstream from the Três Marias Dam, Brazil. In the site immediately following the Dam (S1), low levels of dissolved oxygen were registered in the rainy period. The water temperature was higher in the São Francisco River immediately after the confluence with the Abaeté River (S2), regardless of the period. In S1, the ovaries showed smaller oocytes, high caspase-3 enzymatic activity and apoptosis, lower cells in proliferation and GSI, as well as a lesser quantity of cathepsin-D when compared to females captured from S2. Regarding relative frequency of ovarian structures, in the dry period, only oogonia and perinucleolar oocytes were found in fish ovaries from both sites. On the other hand, in the rainy period, the relative frequency of oogonia and perinucleolar oocytes decreased and the vitellogenic oocytes increased in S2. Postovulatory follicles were observed only in S2, whereas atretic follicles occurred at a higher frequency in S1. Our results showed that apoptosis, cell proliferation and cathepsina-D evaluation can be used as biomarkers of environmental impact. PMID:22153985

  7. Common descent of B chromosomes in two species of the fish genus Prochilodus (Characiformes, Prochilodontidae).

    Science.gov (United States)

    Voltolin, T A; Pansonato Alves, J C; Senhorini, J A; Foresti, F; Camacho, J P M; Porto-Foresti, F

    2013-01-01

    To ascertain the origin of B chromosomes in 2 fish species of the genus Prochilodus, i.e. P. lineatus and P. nigricans, we microdissected them and generated B-specific DNA probes. These probes were used to perform chromosome painting in both species and in 3 further ones belonging to the same genus (P. argenteus, P. brevis and P. costatus). Both probes hybridized with the B chromosomes in P. lineatus and P. nigricans, but with none of the chromosomes in the 5 species. This indicates that the B chromosomes have low similarity with DNAs located in the A chromosomes and suggests the possibility that the B chromosomes in the 2 species have a common origin. The most parsimonious explanation would imply intergeneric hybridization in an ancestor of P. lineatus and P. nigricans yielding the B chromosome as a byproduct, which remained in these 2 species after their phylogenetic origin, but was perhaps lost in other Prochilodus species. This hypothesis predicts that B chromosomes are old genomic elements in this genus, and this could be tested once a species from a relative genus would be found showing homology of its A chromosomes with the B-probes employed here, through a comparison of B chromosome DNA sequences with those in the A chromosomes of this other species. PMID:24028973

  8. 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

  9. 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

  10. Forage fauna in the diet of bigeye tuna (Thunnus obesus in the western tropical Atlantic Ocean

    Directory of Open Access Journals (Sweden)

    Teodoro Vaske Júnior

    2012-03-01

    Full Text Available A total of 291 stomachs of bigeye tuna caught in the Western tropical Atlantic Ocean ranging between 60 and 195 cm fork length, were analyzed between October 2004 and November 2005. The vertical distribution of prey was studied in relation to their feeding strategies. A total of 83 prey items were identified of which 46 were fishes, represented mainly by brephoepipelagic, and meso-bathypelagic fishes; 20 cephalopods, 13 pelagic crustaceans, one tunicate, one heteropod and one pteropod. The Caribbean pomfret Brama caribbea was the most important food item, followed by other mesopelagic fishes such as Alepisaurus ferox, Omosudis lowei, Gempylus serpens, Brama brama and Diretmus argenteus. The squid Ornithoteuthis antillarum was the main preyed-on cephalopod, and the crustaceans Caridea and Brachyuran megalopae were also important food items. The feeding may occur continuously, all the time, or at least during the greater part of the day or night, as part of the feeding strategy to prey upon a vertically scattered small prey distributed in the water column. The relative equality in the proportions of surface, mid-water and deep-water prey organisms reflects the behavior of constant vertical displacement in the search for prey. Although the bigeye tuna prefers subthermocline layers, most of its prey items perform diel migrations and can be preyed on both near the surface and in deeper waters.Um total de 291 estômagos de albacoras-bandolins capturadas no oceano Atlântico tropical oeste variando entre 60 e 195 cm de comprimento furcal, foram analisados entre outubro de 2004 e dezembro de 2005. A distribuição vertical das presas foi estudada em relação às estratégias alimentares. Um total de 83 itens alimentares foi identificado dos quais 46 foram peixes representados principalmente por peixes brefoepipelágicos e mesopelágicos, 20 cefalópodes, 13 crustáceos pelágicos, um tunicado, um heterópode e um pterópode. A palombeta

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

    Directory of Open Access Journals (Sweden)

    Hugo S. de Souza-Filho

    2007-12-01

    Full Text Available Uma espécie nova, correntemente identificada como P. maculatus La Cepède, 1803, é descrita. Ela difere das demais espécies do gênero, exceto de P. maculatus e P. mysteriosus Azpelicueta, 1998, pelo padrão de colorido com máculas escuras sobre os flancos. A nova espécie é morfometricamente similar a P. argenteus Perugia, 1891 e P. mysteriosus, mas difere destas, respectivamente, pelo padrão de colorido maculado e pelo menor comprimento do barbilhão maxilar. Difere de P. maculatus por apresentar o processo supra-occipital mais robusto, com a base quase tão larga quanto o comprimento (versus mais comprido do que largo; narinas anteriores a 25% da margem anterior do focinho, na distância entre o início do focinho até as narinas posteriores (versus 33% dessa distância; serrilhas do acúleo peitoral mais desenvolvidas e presentes em mais da metade da margem anterior do acúleo (versus serrilhas leves e presentes em menos da metade desta margem; pele que recobre a cabeça muito fina, tornando conspícuas as estrias da superfície dos ossos; 22-27 (moda=24 rastros no primeiro arco branquial [versus 19-24 (moda=21]. Também foi discriminado de P. maculatus na análise morfométrica multivariada das variáveis canônicas livres do tamanho, por apresentar maiores valores da distância interorbital, largura da boca e comprimento do barbilhão maxilar e menor comprimento da base da nadadeira adiposa.A new species, formerly identified as P. maculatus La Cepède, 1803, is described. It differs from its congeners, except P. maculatus and P. mysteriosus Azpelicueta, 1998 by the color pattern with dark brown blotches in the flanks. The new species is morphometricaly similar to P. argenteus Perugia, 1891 and P. mysteriosus, differing, respectively, by the blotched color pattern and by the smaller maxillary barbel. The described new species differs from P. maculatus for presenting the supraoccipital process more robust, with base as broad as long

  12. Screening for viral hemorrhagic septicemia virus in marine fish along the Norwegian coastal line.

    Directory of Open Access Journals (Sweden)

    Nina Sandlund

    Full Text Available Viral hemorrhagic septicemia virus (VHSV infects a wide range of marine fish species. To study the occurrence of VHSV in wild marine fish populations in Norwegian coastal waters and fjord systems a total of 1927 fish from 39 different species were sampled through 5 research cruises conducted in 2009 to 2011. In total, VHSV was detected by rRT-PCR in twelve samples originating from Atlantic herring (Clupea harengus, haddock (Melanogrammus aeglefinus, whiting (Merlangius merlangus and silvery pout (Gadiculus argenteus. All fish tested positive in gills while four herring and one silvery pout also tested positive in internal organs. Successful virus isolation in cell culture was only obtained from one pooled Atlantic herring sample which shows that today's PCR methodology have a much higher sensitivity than cell culture for detection of VHSV. Sequencing revealed that the positive samples belonged to VHSV genotype Ib and phylogenetic analysis shows that the isolate from Atlantic herring and silvery pout are closely related. All positive fish were sampled in the same area in the northern county of Finnmark. This is the first detection of VHSV in Atlantic herring this far north, and to our knowledge the first detection of VHSV in silvery pout. However, low prevalence of VHSV genotype Ib in Atlantic herring and other wild marine fish are well known in other parts of Europe. Earlier there have been a few reports of disease outbreaks in farmed rainbow trout with VHSV of genotype Ib, and our results show that there is a possibility of transfer of VHSV from wild to farmed fish along the Norwegian coast line. The impact of VHSV on wild fish is not well documented.

  13. Molecular characterization of benthic foraminifera communities from the Northeastern Gulf of Mexico shelf and slope following the Deepwater Horizon event

    Science.gov (United States)

    Moss, Joseph A.; McCurry, Chelsea; Schwing, Patrick; Jeffrey, Wade H.; Romero, Isabel C.; Hollander, David J.; Snyder, Richard A.

    2016-09-01

    Benthic foraminifera are globally distributed protozoa in the world's oceans, which have been used as ecological indicators in both current and palaeo oceanography. The ecological properties and distribution of these organisms in various regions of the Gulf of Mexico (GOM) have been evaluated using microscopy; however molecular approaches for these purposes have been limited, especially in deeper regions. The BP Deepwater Horizon oil well failure in the northern Gulf of Mexico highlighted the need to better understand the distribution and abundance of these organisms relative to environmental factors and ecosystem perturbations such as the oil spill. Sediment samples were collected using a Shipek grab along transects on the northwest Florida GOM shelf (18-270 m depth). Clone libraries were developed from PCR amplified 18S rDNA genes for sequence analysis. Analysis of random clones from libraries were used as a proxy for community structure (presence and relative abundance) to document the spatial and temporal dynamics of benthic foraminifera on the Northwest Florida Shelf in the NE GOM shelf. Additional continental slope samples (200-1600 m depth) were obtained by a multicorer and treated in similar fashion. Mean species diversity in this study (H=2.49-3.36), agreed with pre-DWH event estimates, however the dominant agglutinated species in the deep-water samples did not match previous studies. Additionally, the dominant calcareous taxa from this study such as Allogromida sp. and Psammophaga sp., were inconsistent with previous reports. The dominant taxa in both coastal and deep-water sites include Glabratellina sp., Trochammina hadai, and Trochammina sp., and Textularia sagittula and Bathysiphon argenteus as well as members of genera Astrammina, Bolivina, Cibicides and Cibicidoides.

  14. Homology of the fifth epibranchial and accessory elements of the ceratobranchials among gnathostomes: insights from the development of ostariophysans.

    Science.gov (United States)

    Carvalho, Murilo; Bockmann, Flávio Alicino; de Carvalho, Marcelo Rodrigues

    2013-01-01

    Epibranchials are among the main dorsal elements of the gill basket in jawed vertebrates (Gnathostomata). Among extant fishes, chondrichthyans most resemble the putative ancestral condition as all branchial arches possess every serially homologous piece. In osteichthyans, a primitive rod-like epibranchial 5, articulated to ceratobranchial 5, is absent. Instead, epibranchial 5 of many actinopterygians is here identified as an accessory element attached to ceratobranchial 4. Differences in shape and attachment of epibranchial 5 in chondrichthyans and actinopterygians raised suspicions about their homology, prompting us to conduct a detailed study of the morphology and development of the branchial basket of three ostariophysans (Prochilodus argenteus, Characiformes; Lophiosilurus alexandri and Pseudoplatystoma corruscans, Siluriformes). Results were interpreted within a phylogenetic context of major gnathostome lineages. Developmental series strongly suggest that the so-called epibranchial 5 of actinopterygians does not belong to the epal series because it shares the same chondroblastic layer with ceratobranchial 4 and its ontogenetic emergence is considerably late. This neomorphic structure is called accessory element of ceratobranchial 4. Its distribution among gnathostomes indicates it is a teleost synapomorphy, occurring homoplastically in Polypteriformes, whereas the loss of the true epibranchial 5 is an osteichthyan synapomorphy. The origin of the accessory element of ceratobranchial 4 appears to have occurred twice in osteichthyans, but it may have a single origin; in this case, the accessory element of ceratobranchial 4 would represent a remnant of a series of elements distally attached to ceratobranchials 1-4, a condition totally or partially retained in basal actinopterygians. Situations wherein a structure is lost while a similar neomorphic element is present may lead to erroneous homology assessments; these can be avoided by detailed morphological and

  15. Assessment of spermatogenesis and plasma sex steroids in a seasonal breeding teleost: a comparative study in an area of influence of a tributary, downstream from a hydroelectric power dam, Brazil.

    Science.gov (United States)

    Domingos, Fabricio F T; Thomé, Ralph G; Arantes, Fabio P; Castro, Antonio Carlos S; Sato, Yoshimi; Bazzoli, Nilo; Rizzo, Elizete

    2012-12-01

    River damming and building of hydroelectric power plants interrupt the reproductive migration routes and change the major physicochemical parameters of water quality, with drastic consequences for populations of migratory fishes. The goal of this study was to evaluate proliferation and cell death during spermatogenesis and serum profiles of sex steroids in Prochilodus argenteus, from the São Francisco River, downstream from the Três Marias Dam. A total of 257 adult males were caught quarterly during a reproductive cycle in two sites: the first 34 km of the river after the dam (site 1) and the second 34-54 km after the dam (site 2), after the confluence with a tributary, the Abaeté River. Seasonal changes in the testicular activity associated with morphometric analyses of germ cells as well as proliferation and testicular apoptosis support a more active spermatogenesis in fish from site 2, where higher levels of sex steroids and gonadosomatic index (GSI) were also found. In site 1, fish presented low serum levels of testosterone, 17β-estradiol and 17α-hydroxyprogesterone and a low GSI during gonadal maturation. Spermatogonial proliferation (PCNA) and apoptosis (TUNEL) were more elevated in fish from site 1, but spermatocytes were mainly labelled in fish from site 2. Overall, these data demonstrate changes in testicular activity and plasma sex steroids in a neotropical teleost fish living downstream from a hydroelectric dam, supplying new data on fish reproduction in regulated rivers. Moreover, morphometric analyses associated with sex steroids profiles provide reliable tools to assess fish spermatogenesis under environmental stress conditions. PMID:22688450

  16. Estimation of absorbed radiation dose rates in wild rodents inhabiting a site severely contaminated by the Fukushima Dai-ichi nuclear power plant accident

    International Nuclear Information System (INIS)

    The dose rates of radiation absorbed by wild rodents inhabiting a site severely contaminated by the Fukushima Dai-ichi Nuclear Power Plant accident were estimated. The large Japanese field mouse (Apodemus speciosus), also called the wood mouse, was the major rodent species captured in the sampling area, although other species of rodents, such as small field mice (Apodemus argenteus) and Japanese grass voles (Microtus montebelli), were also collected. The external exposure of rodents calculated from the activity concentrations of radiocesium (134Cs and 137Cs) in litter and soil samples using the ERICA (Environmental Risk from Ionizing Contaminants: Assessment and Management) tool under the assumption that radionuclides existed as the infinite plane isotropic source was almost the same as those measured directly with glass dosimeters embedded in rodent abdomens. Our findings suggest that the ERICA tool is useful for estimating external dose rates to small animals inhabiting forest floors; however, the estimated dose rates showed large standard deviations. This could be an indication of the inhomogeneous distribution of radionuclides in the sampled litter and soil. There was a 50-fold difference between minimum and maximum whole-body activity concentrations measured in rodents at the time of capture. The radionuclides retained in rodents after capture decreased exponentially over time. Regression equations indicated that the biological half-life of radiocesium after capture was 3.31 d. At the time of capture, the lowest activity concentration was measured in the lung and was approximately half of the highest concentration measured in the mixture of muscle and bone. The average internal absorbed dose rate was markedly smaller than the average external dose rate (<10% of the total absorbed dose rate). The average total absorbed dose rate to wild rodents inhabiting the sampling area was estimated to be approximately 52 μGy h−1 (1.2 mGy d−1), even 3 years after

  17. Redescription of Parspina argentinensis (Szidat, 1954) (Digenea: Cryptogonimidae) from freshwater fishes (Pimelodidae) in the basins of the Paraná and La Plata Rivers, Argentina, with comments on P. bagre Pearse, 1920.

    Science.gov (United States)

    Ostrowski de Núñez, Margarita C; Arredondo, Nathalia J; Doma, Irene L; Gil de Pertierra, Alicia A

    2011-01-01

    The type-specimens of Parspina argentinensis (Szidat, 1954) from Pimelodus maculatus Lacépède, and new material from Iheringichthys labrosus (Lütken), Parapimelodus valenciennis (Lütken), Pimelodella gracilis (Valenciennes), Pimelodus albicans (Valenciennes), P. argenteus Perugia and P. maculatus caught in the basins of the La Plata and Paraná Rivers, Argentina, were studied to elucidate its taxonomic status. The type-specimens of Parspina bagre Pearse, 1920 from Pimelodella metae Eigenmann in Lake Valencia, Venezuela, were also studied and new observations on its morphology recorded. The amendation of the generic diagnosis of Parspina Pearse, 1920 is proposed based on the study of both species, which revealed, among other features, the absence of a thin walled-membrane enclosing the male terminal genitalia. Parspina argentinensis is characterised by the following features: absence of a gonotyl; presence of a bipartite seminal vesicle, pars prostatica and ejaculatory duct; caeca of nearly equal length; uterus extending from the level of the ventral sucker to end of body; testes symmetrical to slightly oblique; ovary transversely elongate, compact and variable in shape; and the utilisation of a wide range of freshwater fishes as hosts. The tegumental surface of this species is covered with pectinate spines arranged quincuncially. Spines decrease in size and density from forebody to hindbody. There are two types of sensory papillae, ciliated and dome-shaped. Ciliated papillae are distributed on the surface of the oral region and on the dorsal and ventral surfaces of the body, whereas dome-shaped papillae are found on the surface of the ventral rim of the oral sucker associated with a ciliated papilla. Gland-duct openings are interspersed with the spines of the oral crown. In addition, the infection indices of P. argentinensis vary widely, not only among different hosts but also between the Paraná and La Plata River basins. Higher prevalences of P. argentinensis

  18. Molecular characterization and specific detection of Anaplasma species (AP-sd) in sika deer and its first detection in wild brown bears and rodents in Hokkaido, Japan.

    Science.gov (United States)

    Moustafa, Mohamed Abdallah Mohamed; Lee, Kyunglee; Taylor, Kyle; Nakao, Ryo; Sashika, Mariko; Shimozuru, Michito; Tsubota, Toshio

    2015-12-01

    A previously undescribed Anaplasma species (herein referred to as AP-sd) has been detected in sika deer, cattle and ticks in Japan. Despite being highly similar to some strains of A. phagocytophilum, AP-sd has never been detected in humans. Its ambiguous epidemiology and the lack of tools for its specific detection make it difficult to understand and interpret the prevalence of this Anaplasma species. We developed a method for specific detection, and examined AP-sd prevalence in Hokkaido wildlife. Our study included 250 sika deer (Cervus nippon yesoensis), 13 brown bears (Ursus arctos yesoensis) and 252 rodents including 138 (Apodemus speciosus), 45 (Apodemus argenteus), 42 (Myodes rufocanus) and 27 (Myodes rutilus) were collected from Hokkaido island, northern Japan, collected during 2010 to 2015. A 770 bp and 382 bp segment of the 16S rRNA and gltA genes, respectively, were amplified by nested PCR. Results were confirmed by cloning and sequencing of the positive PCR products. A reverse line blot hybridization (RLB) based on the 16S rRNA gene was then developed for the specific detection of AP-sd. The prevalence of AP-sd by nested PCR in sika deer was 51% (128/250). We detected this Anaplasma sp. for the first time in wild brown bears and rodents with a prevalence of 15% (2/13) and 2.4% (6/252), respectively. The sequencing results of the 16S rRNA and gltA gene amplicons were divergent from the selected A. phagocytophilum sequences in GenBank. Using a newly designed AP-sd specific probe for RLB has enabled us to specifically detect this Anaplasma species. Besides sika deer and cattle, wild brown bears and rodents were identified as potential reservoir hosts for AP-sd. This study provided a high throughput molecular method that specifically detects AP-sd, and which can be used to investigate its ecology and its potential as a threat to humans in Japan. PMID:26431688

  19. Stomach contents of cetaceans in the Alboran Sea and Gulf of Cadiz.

    Directory of Open Access Journals (Sweden)

    M. Garcia-Polo

    2014-06-01

    Full Text Available This work describes the diet, through the analysis of stomach contents, of different species of cetaceans in Andalusian waters. Stomachs of 53 specimens, 36 striped dolphins (Stenella coeruleoalba, 13 common dolphins (Delphinus delphis and 4 Risso's dolphins (Grampus griseus stranded in the provinces of Cadiz, Huelva, Malaga and Almeria (South Iberian Peninsula were examined. Strandings were attended by members of the official stranding network of Andalusia. Fourteen of the specimens had no food remains in the stomachs: 9 striped dolphins, 2 common dolphins and 1 Risso´s dolphin. Prey remains consisted mostly of hard structures e.g. fish otoliths, bones and eye lenses, cephalopod jaws and eye lenses and crustaceans exoskeletons. These remains were identified using published guides (e.g. Clarke, 1986; Härkonen, 1986; Xavier & Cherel, 2009 and reference material available at the Centro Oceanográfico in Vigo of the Spanish Institute of Oceanography (IEO. Diet was characterised for each cetacean species using three standard indices, calculated for each category of prey and for group totals: the frequency of occurrence in the stomachs, the number of individuals and the reconstructed prey weight. These indices were also expressed as percentages to allow comparison between cetacean species and groups (e.g. dolphin sex and area of stranding. The results indicate that striped dolphins feed predominantly on small mesopelagic fish, mainly species of the Myctophidae family, although pearlsides (Maurolicus muelleri were also present. Significant numbers of gobies (Gobiidae were also found in the stomachs. Other prey identified were hake (Merluccius merluccius, silvery pout (Gadiculus argenteus, bogue (Boops boops and scads (Trachurus spp.. Because of the degree of erosion of some otoliths they could not be identified to species level. Cephalopods were also found in the stomachs of striped dolphins with specimens of the families Brachioteuthidae

  20. Estimation of absorbed radiation dose rates in wild rodents inhabiting a site severely contaminated by the Fukushima Dai-ichi nuclear power plant accident.

    Science.gov (United States)

    Kubota, Yoshihisa; Takahashi, Hiroyuki; Watanabe, Yoshito; Fuma, Shoichi; Kawaguchi, Isao; Aoki, Masanari; Kubota, Masahide; Furuhata, Yoshiaki; Shigemura, Yusaku; Yamada, Fumio; Ishikawa, Takahiro; Obara, Satoshi; Yoshida, Satoshi

    2015-04-01

    The dose rates of radiation absorbed by wild rodents inhabiting a site severely contaminated by the Fukushima Dai-ichi Nuclear Power Plant accident were estimated. The large Japanese field mouse (Apodemus speciosus), also called the wood mouse, was the major rodent species captured in the sampling area, although other species of rodents, such as small field mice (Apodemus argenteus) and Japanese grass voles (Microtus montebelli), were also collected. The external exposure of rodents calculated from the activity concentrations of radiocesium ((134)Cs and (137)Cs) in litter and soil samples using the ERICA (Environmental Risk from Ionizing Contaminants: Assessment and Management) tool under the assumption that radionuclides existed as the infinite plane isotropic source was almost the same as those measured directly with glass dosimeters embedded in rodent abdomens. Our findings suggest that the ERICA tool is useful for estimating external dose rates to small animals inhabiting forest floors; however, the estimated dose rates showed large standard deviations. This could be an indication of the inhomogeneous distribution of radionuclides in the sampled litter and soil. There was a 50-fold difference between minimum and maximum whole-body activity concentrations measured in rodents at the time of capture. The radionuclides retained in rodents after capture decreased exponentially over time. Regression equations indicated that the biological half-life of radiocesium after capture was 3.31 d. At the time of capture, the lowest activity concentration was measured in the lung and was approximately half of the highest concentration measured in the mixture of muscle and bone. The average internal absorbed dose rate was markedly smaller than the average external dose rate (wild rodents inhabiting the sampling area was estimated to be approximately 52 μGy h(-1) (1.2 mGy d(-1)), even 3 years after the accident. This dose rate exceeds 0.1-1 mGy d(-1) derived consideration

  1. Natural isotope of polonium in the edible tissue of Malaysian seafood

    International Nuclear Information System (INIS)

    Natural isotope of polonium (210Po) in edible seafood tissue samples from east and west coast Peninsular of Malaysia was measured using the Alpha Spectrometry after spontaneous deposition on silver disc. Concentrations level of 210Po in the edible tissue of squid (Loligo spp) brought from Pasar Siti Khadijah an Pengkalan Kubor Kelantan, Pasar Chabang Tiga and Pasar Besar Dungun Terengganu, and Pasar Endau and Pasar Mersing Johor were ranging from 11.9 ± 1.2 Bq/kg to 71.1 ± 3.7 Bq/kg with mean value of 30.34 ± 1.29 Bq/kg. While the ranged activity of 210Po in the organism samples collected near coal power station was 4.4 ± 0.12 to 6.4 ± 0.95 Bq/kg in fish, 45.7 ± 0.86 to 54.4 ± 1.58 Bq/kg in crustacean and 104.3 ± 3.44 to 293.8 ± 10.04 Bq/ kg in molluscs. But the level of 210Po in fish species of Alute mate, Pampus argenteus, Cynoglossus macrolepidotu and Sillago sihama caught in the water of Kuala Selangor in the ranged of 0.47 Bq/kg to 68.10 Bq/kg. The study also conducting on soft part of Anadara granosa purchased at Kuala Selangor, west coast of Malaysia in August 2001, April 2002 and September 2002. It is shown that 210Po is non-uniformly distributed within cockles of various sizes (i.e., 2.5, 3.0, 3.5 and 4.0 cm of shell length) and the concentration of 210Po in the soft parts of cockle was significantly different (p<0.05) due to sampling date. The highest value was observed in the smallest cockle with a shell length of 2.5 cm (411.6±26.16 Bq/g dry wt.). It is clear that there is an allometric relationship between 210Po activity concentration and individual cockle weight. This may reflect on the differences of metabolic rate and growth age of cockles and will discuss in detail during conference. (author)

  2. Especies leñosas nativas claves para la restauración ecológica del Embalse de Chisacá, Colombia, con base en rasgos importantes de su historia de vida

    Directory of Open Access Journals (Sweden)

    Rodríguez Ramírez Natalia

    2006-12-01

    Full Text Available Se determinaron cinco especies nativas leñosas, como claves para la restauración de plantaciones de Pinus patula
    y Corredor ripario potrerizado del embalse de Chisacá (localidad de Usme, Bogotá, Colombia 3.000-3.250
    msnm; 4°08’59’’ N; 74°17’62’’ W, con base en Rasgos de de Historia de Vida (RHV y otras características de
    especies presentes en estas áreas. Teniendo en cuenta el objetivo del estudio y las características de las áreas
    degradadas se seleccionaron y analizaron 23 rasgos a cada una de las especies evaluadas en los distintos ambientes. En la zona de pinos se estudiaron 23 especies, 21 en el corredor ripario potrerizado y 20 en el Matorral Bajo. Se estableció un sistema de calificación para las posibles respuestas de cada uno de los rasgos según su incidencia en la restauración ecológica de las áreas a restaurar. Posteriormente, se calificaron los resultados de los rasgos de cada una de las especies y se calculó una calificación final de éstas. Se recomiendan como especies claves para la restauración las cinco especies que obtuvieron mayor calificación final. Teniendo en cuenta lo anterior se recomiendan como especies claves para la restauración de la zona de pinos las especies Hesperomeles goudotiana (72,41%, Vallea stipularis (67,82%, Symplocos s theiformis (67,82%, Holodiscus argenteus (65,52%, y Myrcianthes leucoxyla (65,52% y para el corredor ripario potrerizado las especies Hesperomeles goudotiana (75,86%, Brugmansia sanguinea (74,71%, Myrcianthes leucoxyla (68,97%, Berberis goudotii (65,48% y Vallea stipularis (64,37%. La selección de especies claves para la restauración con base en RHV parece ser una metodología adecuada, siempre y cuando la selección de rasgos se haga cuidadosamente, teniendo en cuenta
    los objetivos del estudio y que las especies consideradas se estudien en cada ambiente donde se desarrollen. En
    efecto, se observó que los rasgos responden de

  3. Obtención de secuencias microsatelitales especie especificas para Plagioscion magdalenae (Pisces:Sciaenidae

    Directory of Open Access Journals (Sweden)

    Bayona-Vásquez Natalia Juliana

    2007-12-01

    Full Text Available Plagioscion magdalenae pertenece a los sciaenidae, ésta familia es ampliamente reconocida por ser un recurso
    pesquero importante a nivel mundial, principalmente de especies marinas o estuarinas. P. magdalenae es una
    especie de importancia económica, dada su frecuencia de captura y comestibilidad de su carne, que se encuentra
    en la parte baja de la cuenca del río Magdalena y en la cuenca del río San Jorge, Colombia, en donde cada vez su comercialización cobra fuerza debido al desplazamiento y disminución en los volúmenes de captura de otras especies como el bagre rayado y bocachico. Lo cual ha llevado a la comúnmente llamada pacora a catalogarse en estado de vulnerabilidad en las cuencas colombianas. Lo anterior, hace necesario la generación de información que sirva de sustento a programas de conservación y uso sostenible de la especie. Una primera aproximación a las poblaciones de P. magdalenae puede ser hecha a través de marcadores moleculares microsatelitales, útiles en trabajos de genética de poblaciones, conservación y manejo de recursos biológicos. Sin embargo, la principal dificultad de los microsatélites es que deben ser aislados de novo para aquellas especies que van a ser evaluadas por primera vez, lo que lleva a la necesidad de obtener primers para la especie. En este trabajo, inicialmente se obtuvo un ADN de buena calidad útil para amplificaciones a partir de muestras de músculo colectadas en cuatro puntos de la cuenca del río San Jorge; posteriormente, se aislaron primers microsatelitales especie-específicos para P. magdalenae mediante amplificación cruzada con primers de otras especies de peces lejanas, entre las cuales se encuentra: Pseudoplatystoma corruscans, Pimelodella chagressi, Prochilodus argenteus y Prochilodus costatus. Para lo anterior, fue necesario modificar y estandarizar protocolos de amplificación mediante cambios en temperatura de alineamiento y concentración de reactivos; y

  4. 夏、秋季长江口鱼类群落结构%Fish community structure of the Yangtze River Estuary in summer and autumn

    Institute of Scientific and Technical Information of China (English)

    沈新强; 史赟荣; 晁敏; 黄厚见; 唐峰华

    2011-01-01

    For studying the fish community characteristics influenced by the habitat variation in Yangtze River Estuary, which could be used to determine how to manage its fish resources usefully, fishes from Yangtze River Estuary were collected during summer( the second half month of May to August 2010 )and autumn( September 2010 )every week (every half a month in the first half of August). During the study periods,39 species belonging to 6 fish ecological guilds and 20 families, 12 orders were identified, most of them were marine migrant fishes( 17 species )and estuarine resident species (14 species), and Engraulidae had the highest numbers of fishes (6 species ), then followed by Gobiidae and Sciaenidae (4 species ).Cochran and Friedman test was used to indicate that species composition or numbers of each guild in each month between May and September had no significant difference, respectively. Marine migrant taxa were both the most important guild of abundance or catch in each month, and average abundance or catch per net showed no statistical variations between May and August, but it was higher in September than that from May to August( except average abundance in July). Significant difference occurred in abundance or catch rank in each guild. Percentages of juveniles of 6 importantly commercial species (Big head croaker Collichthys lucidus, Japanese grenadier anchovy Coilia nasus, Osbeck' s grenadier anchovy Coilia mystus, silver pomfret Pampus argenteus,dark pomfret Pampus cinereus,and Bombay duck Harpodon nehereus) were examined to exhibit the variability in rank-distributions, C. lucidus and C. nasus declined, by contrast, C. rnystus increased,P. argenteus occured from May to August, while P. cinereus was observed during August to September. C. nasus spawn in fresh water, but C. rnystus breed in the Estuary, which would reflect the temporal or spatial segregation of species of fishes belonging the same genus and were considered the ecological lysimilar, impling that

  5. ANALYSIS ON THE SPECIES DIVERSITY OF FISHERY ANIMALS IN DAIQUYANG%岱衢洋渔业动物多样性分析

    Institute of Scientific and Technical Information of China (English)

    张洪亮; 梁君; 贺舟挺; 王伟定; 周永东

    2012-01-01

    The Daiquyang locates between the Daishan and Qushan Islands in the Zhoushan Archipelago. Due to its optimal location and suitable environmental characteristics, it is the spawning and feeding ground of Larimichthys cro-cea of the Daiqu Race, and also of other fishery animals (fish species such as Larimichthys polyactis, Trichiurus ja-ponicus, Pampus argenteus and Engraulis japonicus, crustacean species such as Portunus trituberculatus, Charyhdis japonica, Exopalaemon carinicauda, Acetes chinensis and Oratosquilla oratoria, cephalopods such as Sepiella main-droni, Octopus variabilis, Octopus ocellatus and Loligo duvaucelii, and other animal species such as Nassarius variciferus, Sliqua minima, Cantharus cecillei and Moerella irideseens). For a long time, although the Daiquyang plays an important role in marine fisheries in the East China Sea, there have been no studies focused on the species diversity of its fishery animals. In recent years, both the environment and fishery resources in the Daiquyang have been facing new threats arisen from rapid development of harbor industries and a mass of shore reclamation in the Zhoushan Archipelago District, Zhejiang. Therefore it is necessary to study the species diversity of fishery animals in this area. We analyzed fishery animal diversity and the status of fishery resources based on four surveys conducted by bottom trawl, setting gillnet and crab pot from April to November 2007 in the Daiquyang. Three analytical methods including sweep-area method, biodiversity analysis and analysis of variance were used. The results showed that: 1) a total of 98 fishery animals were sampled, including fishes (58 species), crustaceans (32 species), cephalopods (3 species) and other species (6 species), belonging to 53 families of 20 orders, 7 classes and 4 phylums. 2) In our trawl collections, a total of 68 fishery animals were obtained, including fishes (38 species), crustaceans (23 species), cephalopods (2 species) and other species (5

  6. Functional groups of fish assemblages and their major species in the Bohai Sea%渤海鱼类群落功能群及其主要种类

    Institute of Scientific and Technical Information of China (English)

    张波; 李忠义; 金显仕

    2012-01-01

    根据2009年8月和10月对渤海渔业资源的底拖网调查,采用胃含物分析、聚类分析和功能群划分的方法研究了渤海鱼类群落的功能群组成及其主要种类.结果表明,渤海夏、秋季鱼类群落包括7个功能群,分别为浮游动物食性功能群、杂食性功能群、底栖动物食性功能群、虾食性功能群、虾/鱼食性功能群、鱼食性功能群和广食性功能群;其中主要功能群为浮游动物食性功能群、杂食性功能群和虾/鱼食性功能群;主要种类有小黄鱼、蓝点马鲛、斑(鱼祭)、赤鼻棱鳀、银鲳和黄鲫.圆筛藻、中华哲水蚤、太平洋磷虾、长额刺糠虾、中国毛虾、甲壳类幼体、日本鼓虾、六丝矛尾(鱼段)虎鱼、小黄鱼、双壳类和腹足类是当前渤海夏、秋季鱼类群落的主要饵料种类.%The Bohai Sea is a semi-enclosed shallow sea and is an important spawning,nursery and feeding ground for many migratory species from the Yellow Sea. Currently, overfishing and environment degradation may have changed the community structure in the Bohai Sea. The decline in the biomass, species composition, and size spectrum indicates a degradation of the Bohai Sea ecosystem. At the same time, the mean trophic level at high trophic level declined faster than global trend. So, it is very necessary to re-understand the feeding relationship in the Bohai Sea. Based on the data collected from bottom trawl surveys conducted in August and October of 2009 in the Bohai Sea,23 kinds of fish species, not including silver pomfret Pampus argenteus, and 7263 stomach samples were analyed. According to stomach analysis, the cluster analysis, of which 60% of similarity level was used as criterion, was used to study the functional groups and their major species of fish assemblages in the Bohai Sea. The results suggested that seven functional groups were divided among fish assemblages in the Bohai Sea,that is zooplantivores

  7. Population genetic structure of Pneumatophorus japonicus in the Taiwan Strait%台湾海峡鲐鱼种群遗传结构

    Institute of Scientific and Technical Information of China (English)

    张丽艳; 苏永全; 王航俊; 王军

    2011-01-01

    combination ranged from 60. 00% to 94.29%. The proportion of polymorphic loci, the Nei genetic diversity and Shannon genetic diversity index had no significant difference ( P>0. 05 ) between the two populations with 57. 75% , 0. 1779 and 0. 2725 in eastern Fujian waters, and 64.59% , 0.2123 and 0.3228 in southern Fujian waters, respectively. The G,,value, Shannon genetic diversity index and AMOVA analysis showed that the genetic variation mainly existed among individuals within population. Nn showed the frequent gene flow between the two populations. Dominant gene frequency revealed that both populations had a similar genetic structure. This study reveals that the genetic diversity of the two initially proposed populations is at the same level. We propose that the stocks of P. Japonicus in the Taiwan Strait belong to the same population. Further studies using co-dominant markers are needed for a better understanding of the population genetics of P. Japonicus.The genetic diversity of P. Japonicus in the Taiwan Strait is considerably higher than some commercially important marine fishes in coastal waters of China, such as the Hong Kong grouper Epinephelus akaara, Yellow drum Nibea albiflora, Barfin flounder Verasper moseri and Silver pomfret Pampus argenteus. Wide distribution and short reproductive cycle may contribute to high genetic diversity of P. Japonicus. Annual migrations and larval drift in the ocean currents can explain the genetic homogeneity in the studied areas. Currently, the fishery of P. Japonicus in southern Fujian waters remains stable; however, it shows a decline in eastern Fujian waters. Therefore, timely and effective management can ensure the sustainable use of P. Japonicus wild stocks in China.%以往研究表明,台湾海峡的鲐鱼分属2个地理种群,即东海种群和闽南——粤东地方种群.为研究这2个种群的遗传结构,对鲐鱼闽东(30尾)和闽南(30尾)种群进行了AFLP分析,8对选择性引物在2个种群60

  8. Community structure of fish resources in spring and autumn in the Yellow Sea off Shandong%黄海山东海域春、秋季鱼类群落结构

    Institute of Scientific and Technical Information of China (English)

    吕振波; 李凡; 王波; 徐炳庆; 魏振华; 张焕君; 张培超

    2011-01-01

    Fishery science and management are progressively switching their attention from single species to ecosystems,and increasing the need for research of fish community.Based on the data collected by trawl surveys in May and October of 2006 in the Yellow Sea off Shandong, fish community patterns such as species compositions and spatial pattern were analyzed.In the investigated area,35°00’ -38°00’N,120°30’- 124°00’E,45 sample stations were set up.The survey data were standardized by sweep area and capture coefficient.The capture coefficient was set to 0.55 for pelagic fish and 0.35 for near demersal fish and 0.25 for demersal fish.The index of relative importance ( IRI ) was calculated to determine the importance of the species.Species were defined as dominant species when IRI value is more than 1 000.Important species were defined for those IRI value being grealer than 100 but no more than 1000.The multivariate statistical analyses include cluster analysis, NMDS,SIMPER and BIOENV to analyze the pattern of community compositions.The species,whose cumulative biomass less than 0.01% or frequency less than 5% ,were excluded from multivariate statistical analyses.The abundance biomass comparison( ABC)curves and W-statistic,generated by PRIMER,were used to analyze the communities'disturbed states.The results showed that a total number of 61 species belonging to 57 genera,37 families and 13 orders were collected,50 in springs and 50 in autumns.The dominant species were Pacific sandeel (Ammodytes personatus) ,Japanese anchovy ( Engraulis japonicas ) and fang' s blenny ( Enedrias fangi ) in spring, and were Japanese anchovy and Japanese sardinella ( Sardinella zunasi)in autumn.The important species were Pacific cod ( Gadus macrocephalus ) in spring, and were yellow croaker ( Larimichthys polyactis ), silver pomfret ( Pampus argenteus) ,Pacific sandeel and rednose anchovy ( Thrissa kammalensis)in autumn.The fish communities were predominant by little