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Sample records for seriola lalandi valenciennes

  1. Random and systematic sampling error when hooking fish to monitor skin fluke (Benedenia seriolae) and gill fluke (Zeuxapta seriolae) burden in Australian farmed yellowtail kingfish (Seriola lalandi).

    Science.gov (United States)

    Fensham, J R; Bubner, E; D'Antignana, T; Landos, M; Caraguel, C G B

    2018-05-01

    The Australian farmed yellowtail kingfish (Seriola lalandi, YTK) industry monitor skin fluke (Benedenia seriolae) and gill fluke (Zeuxapta seriolae) burden by pooling the fluke count of 10 hooked YTK. The random and systematic error of this sampling strategy was evaluated to assess potential impact on treatment decisions. Fluke abundance (fluke count per fish) in a study cage (estimated 30,502 fish) was assessed five times using the current sampling protocol and its repeatability was estimated the repeatability coefficient (CR) and the coefficient of variation (CV). Individual body weight, fork length, fluke abundance, prevalence, intensity (fluke count per infested fish) and density (fluke count per Kg of fish) were compared between 100 hooked and 100 seined YTK (assumed representative of the entire population) to estimate potential selection bias. Depending on the fluke species and age category, CR (expected difference in parasite count between 2 sampling iterations) ranged from 0.78 to 114 flukes per fish. Capturing YTK by hooking increased the selection of fish of a weight and length in the lowest 5th percentile of the cage (RR = 5.75, 95% CI: 2.06-16.03, P-value = 0.0001). These lower end YTK had on average an extra 31 juveniles and 6 adults Z. seriolae per Kg of fish and an extra 3 juvenile and 0.4 adult B. seriolae per Kg of fish, compared to the rest of the cage population (P-value sampling towards the smallest and most heavily infested fish in the population, resulting in poor repeatability (more variability amongst sampled fish) and an overestimation of parasite burden in the population. In this particular commercial situation these finding supported that health management program, where the finding of an underestimation of parasite burden could provide a production impact on the study population. In instances where fish populations and parasite burdens are more homogenous, sampling error may be less severe. Sampling error when capturing fish

  2. The Microbiome of Seriola lalandi of Wild and Aquaculture Origin Reveals Differences in Composition and Potential Function

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    Carolina Ramírez

    2017-09-01

    Full Text Available Seriola lalandi is an economically important species that is globally distributed in temperate and subtropical marine waters. Aquaculture production of this species has had problems associated with intensive fish farming, such as disease outbreaks or nutritional deficiencies causing high mortalities. Intestinal microbiota has been involved in many processes that benefit the host, such as disease control, stimulation of the immune response, and the promotion of nutrient metabolism, among others. However, little is known about the potential functionality of the microbiota and the differences in the composition between wild and aquacultured fish. Here, we assayed the V4-region of the 16S rRNA gene using high-throughput sequencing. Our results showed that there are significant differences between S. lalandi of wild and aquaculture origin (ANOSIM and PERMANOVA, P < 0.05. At the genus level, a total of 13 genera were differentially represented between the two groups, all of which have been described as beneficial microorganisms that have an antagonistic effect against pathogenic bacteria, improve immunological parameters and growth performance, and contribute to nutrition. Additionally, the changes in the presumptive functions of the intestinal microbiota of yellowtail were examined by predicting the metagenomes using PICRUSt. The most abundant functional categories were those corresponding to the metabolism of cofactors and vitamins, amino acid metabolism and carbohydrate metabolism, revealing differences in the contribution of the microbiota depending on the origin of the animals. To our knowledge, this is the first study to characterize and compare the intestinal microbiota of S. lalandi of wild and aquaculture origin using high-throughput sequencing.

  3. The Microbiome of Seriola lalandi of Wild and Aquaculture Origin Reveals Differences in Composition and Potential Function.

    Science.gov (United States)

    Ramírez, Carolina; Romero, Jaime

    2017-01-01

    Seriola lalandi is an economically important species that is globally distributed in temperate and subtropical marine waters. Aquaculture production of this species has had problems associated with intensive fish farming, such as disease outbreaks or nutritional deficiencies causing high mortalities. Intestinal microbiota has been involved in many processes that benefit the host, such as disease control, stimulation of the immune response, and the promotion of nutrient metabolism, among others. However, little is known about the potential functionality of the microbiota and the differences in the composition between wild and aquacultured fish. Here, we assayed the V4-region of the 16S rRNA gene using high-throughput sequencing. Our results showed that there are significant differences between S. lalandi of wild and aquaculture origin (ANOSIM and PERMANOVA, P < 0.05). At the genus level, a total of 13 genera were differentially represented between the two groups, all of which have been described as beneficial microorganisms that have an antagonistic effect against pathogenic bacteria, improve immunological parameters and growth performance, and contribute to nutrition. Additionally, the changes in the presumptive functions of the intestinal microbiota of yellowtail were examined by predicting the metagenomes using PICRUSt. The most abundant functional categories were those corresponding to the metabolism of cofactors and vitamins, amino acid metabolism and carbohydrate metabolism, revealing differences in the contribution of the microbiota depending on the origin of the animals. To our knowledge, this is the first study to characterize and compare the intestinal microbiota of S. lalandi of wild and aquaculture origin using high-throughput sequencing.

  4. Origin of yellow kingfish, Seriola lalandi, from Lord Howe Island, Australia, inferred from otolith chemistry

    International Nuclear Information System (INIS)

    Patterson, H.M.; Swearer, S.E.

    2008-01-01

    Yellowtail kingfish, Seriola lalandi (Family Carangidae), sustain important commercial and recreational fisheries in New South Wales (NSW), Australia. However, little is known about their population structure, particularly whether the kingfish around Lord Howe Island (LHI) comprise a distinct stock, separate from that of the NSW stock. We examined the otolith chemistry from juvenile kingfish collected from LHI, several NSW sites and Elizabeth and Middleton reefs (EMR) and compared those elemental signatures to the juvenile portion of adult otoliths collected from LHI to determine where the adults may have originated. Our results indicate a robust separation in otolith signatures from different locations (error rate of classification ranged from 3.5% to 9.9%), and suggest that a significant proportion of the adult kingfish sampled (28%) may have originated in the waters around LHI or nearby EMR. Further research may indicate that the management of kingfish in NSW waters could benefit from a more spatially explicit strategy. (author). 32 refs., 3 figs., 2 tabs.

  5. First High-Density Linkage Map and Single Nucleotide Polymorphisms Significantly Associated With Traits of Economic Importance in Yellowtail Kingfish Seriola lalandi

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    Nguyen H. Nguyen

    2018-04-01

    Full Text Available The genetic resources available for the commercially important fish species Yellowtail kingfish (YTK (Seriola lalandi are relative sparse. To overcome this, we aimed (1 to develop a linkage map for this species, and (2 to identify markers/variants associated with economically important traits in kingfish (with an emphasis on body weight. Genetic and genomic analyses were conducted using 13,898 single nucleotide polymorphisms (SNPs generated from a new high-throughput genotyping by sequencing platform, Diversity Arrays Technology (DArTseqTM in a pedigreed population comprising 752 animals. The linkage analysis enabled to map about 4,000 markers to 24 linkage groups (LGs, with an average density of 3.4 SNPs per cM. The linkage map was integrated into a genome-wide association study (GWAS and identified six variants/SNPs associated with body weight (P < 5e-8 when a multi-locus mixed model was used. Two out of the six significant markers were mapped to LGs 17 and 23, and collectively they explained 5.8% of the total genetic variance. It is concluded that the newly developed linkage map and the significantly associated markers with body weight provide fundamental information to characterize genetic architecture of growth-related traits in this population of YTK S. lalandi.

  6. First High-Density Linkage Map and Single Nucleotide Polymorphisms Significantly Associated With Traits of Economic Importance in Yellowtail Kingfish Seriola lalandi.

    Science.gov (United States)

    Nguyen, Nguyen H; Rastas, Pasi M A; Premachandra, H K A; Knibb, Wayne

    2018-01-01

    The genetic resources available for the commercially important fish species Yellowtail kingfish (YTK) ( Seriola lalandi) are relative sparse. To overcome this, we aimed (1) to develop a linkage map for this species, and (2) to identify markers/variants associated with economically important traits in kingfish (with an emphasis on body weight). Genetic and genomic analyses were conducted using 13,898 single nucleotide polymorphisms (SNPs) generated from a new high-throughput genotyping by sequencing platform, Diversity Arrays Technology (DArTseq TM ) in a pedigreed population comprising 752 animals. The linkage analysis enabled to map about 4,000 markers to 24 linkage groups (LGs), with an average density of 3.4 SNPs per cM. The linkage map was integrated into a genome-wide association study (GWAS) and identified six variants/SNPs associated with body weight ( P 5e -8 ) when a multi-locus mixed model was used. Two out of the six significant markers were mapped to LGs 17 and 23, and collectively they explained 5.8% of the total genetic variance. It is concluded that the newly developed linkage map and the significantly associated markers with body weight provide fundamental information to characterize genetic architecture of growth-related traits in this population of YTK S. lalandi .

  7. Metal concentrations and toxicity in South African snoek (Thyrsites atun) and yellowtail (Seriola lalandi).

    Science.gov (United States)

    Bosch, Adina C; O'Neill, Bernadette; Kerwath, Sven E; Sigge, Gunnar O; Hoffman, Louwrens C

    2017-09-15

    The concentrations of 16 metals were assessed in snoek(Thyrsites atun; n=20) and yellowtail (Seriola lalandi; n=37) sampled from the West and South-East coasts of South Africa. Variability was observed at both small (Al, Cr, Hg, Pb, Mn and Cu) and large (As and Cu) spatial scales while inter-specific examination revealed diverse metal concentrations in snoek (Higher levels: Cr, Mn, Co, Hg and Pb) and yellowtail (higher levels: Fe and Cu). Zn, As and Hg were positively correlated with yellowtail size with no such correlations in snoek. Mean concentrations of As (0.61mg·kg -1 ; 0.98mg·kg -1 ), Cd (0.008mg·kg -1 ; 0.004mg·kg -1 ), Hg (0.27mg·kg -1 ; 0.16mg·kg -1 ) and Pb (0.009mg·kg -1 ; 0.005mg·kg -1 ) for snoek and yellowtail respectively were within regulatory guidelines. However, 10% (n=2) of snoek exceeded Hg maximum allowable limit, suggesting caution and further investigation. Overall, two meals (150g) per week of snoek or larger yellowtail (12-15kg) can be safe for human (adult) consumption. Copyright © 2017 Elsevier Ltd. All rights reserved.

  8. Metabolism of Seriola lalandi during Starvation as Revealed by Fatty Acid Analysis and Compound-Specific Analysis of Stable Isotopes within Amino Acids.

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    Fernando Barreto-Curiel

    Full Text Available Fish starvation is defined as food deprivation for a long period of time, such that physiological processes become confined to basal metabolism. Starvation provides insights in physiological processes without interference from unknown factors in digestion and nutrient absorption occurring in fed state. Juveniles of amberjack Seriola lalandi were isotopically equilibrated to a formulated diet for 60 days. One treatment consisted of fish that continued to be fed and fish in the other treatment were not fed for 35 days. The isotopic signatures prior to the beginning of and after the starvation period, for fish in the starvation and control treatments, were analysed for lipid content, fatty acid composition and isotopic analysis of bulk (EA-IRMS and of amino acids (compound specific isotope analysis, CSIA. There were three replicates for the starvation group. Fatty acid content in muscle and liver tissue before and after starvation was determined to calculate percent change. Results showed that crude lipid was the most used source of energy in most cases; the PUFAs and LC-PUFAs were highly conserved. According to the protein signature in bulk (δ15N and per amino acid (δ13C and δ15N, in muscle tissue, protein synthesis did not appear to occur substantially during starvation, whereas in liver, increases in δ13C and δ15N indicate that protein turnover occurred, probably for metabolic routing to energy-yielding processes. As a result, isotopic values of δ15N in muscle tissue do not change, whereas CSIA net change occurred in the liver tissue. During the study period of 35 days, muscle protein was largely conserved, being neither replenished from amino acid pools in the plasma and liver nor catabolized.

  9. Analysis of the complete genome sequence of Nocardia seriolae UTF1, the causative agent of fish nocardiosis: The first reference genome sequence of the fish pathogenic Nocardia species.

    Science.gov (United States)

    Yasuike, Motoshige; Nishiki, Issei; Iwasaki, Yuki; Nakamura, Yoji; Fujiwara, Atushi; Shimahara, Yoshiko; Kamaishi, Takashi; Yoshida, Terutoyo; Nagai, Satoshi; Kobayashi, Takanori; Katoh, Masaya

    2017-01-01

    Nocardiosis caused by Nocardia seriolae is one of the major threats in the aquaculture of Seriola species (yellowtail; S. quinqueradiata, amberjack; S. dumerili and kingfish; S. lalandi) in Japan. Here, we report the complete nucleotide genome sequence of N. seriolae UTF1, isolated from a cultured yellowtail. The genome is a circular chromosome of 8,121,733 bp with a G+C content of 68.1% that encodes 7,697 predicted proteins. In the N. seriolae UTF1 predicted genes, we found orthologs of virulence factors of pathogenic mycobacteria and human clinical Nocardia isolates involved in host cell invasion, modulation of phagocyte function and survival inside the macrophages. The virulence factor candidates provide an essential basis for understanding their pathogenic mechanisms at the molecular level by the fish nocardiosis research community in future studies. We also found many potential antibiotic resistance genes on the N. seriolae UTF1 chromosome. Comparative analysis with the four existing complete genomes, N. farcinica IFM 10152, N. brasiliensis HUJEG-1 and N. cyriacigeorgica GUH-2 and N. nova SH22a, revealed that 2,745 orthologous genes were present in all five Nocardia genomes (core genes) and 1,982 genes were unique to N. seriolae UTF1. In particular, the N. seriolae UTF1 genome contains a greater number of mobile elements and genes of unknown function that comprise the differences in structure and gene content from the other Nocardia genomes. In addition, a lot of the N. seriolae UTF1-specific genes were assigned to the ABC transport system. Because of limited resources in ocean environments, these N. seriolae UTF1 specific ABC transporters might facilitate adaptation strategies essential for marine environment survival. Thus, the availability of the complete N. seriolae UTF1 genome sequence will provide a valuable resource for comparative genomic studies of N. seriolae isolates, as well as provide new insights into the ecological and functional diversity of

  10. Seasonal population dynamics of Zeuxapta seriolae (Monogenea: Heteraxinidae) parasitising Seriola dumerili (Carangidae) in the Western Mediterranean

    Czech Academy of Sciences Publication Activity Database

    Repulles-Albelda, A.; Kostadinova, Aneta; Raga, J. A.; Montero, F. E.

    2013-01-01

    Roč. 193, 1-3 (2013), s. 163-171 ISSN 0304-4017 R&D Projects: GA ČR GBP505/12/G112 Institutional support: RVO:60077344 Keywords : Zeuxapta seriolae * Seriola dumerili * Monogenea * Population dynamics * Western Mediterranean Subject RIV: EH - Ecology, Behaviour Impact factor: 2.545, year: 2013

  11. Assessing effectiveness of electrical stunning and chillingin ice water of farmed yellowtail kingfish, common sole and pike-perch

    NARCIS (Netherlands)

    Llonch, P.; Lambooij, E.; Reimert, H.G.M.; Vis, van de J.W.

    2012-01-01

    Animals should be rendered unconscious before slaughter in order to avoid suffering or pain. The objective of this study was to evaluate an electrical stunning after dewatering to induce instantaneous unconsciousness and insensibility in yellowtail kingfish (Seriola lalandi), common sole (Solea

  12. Molecular systematics and biogeography of the circumglobally distributed genus Seriola (Pisces: Carangidae).

    Science.gov (United States)

    Swart, Belinda L; von der Heyden, Sophie; Bester-van der Merwe, Aletta; Roodt-Wilding, Rouvay

    2015-12-01

    The genus Seriola includes several important commercially exploited species and has a disjunct distribution globally; yet phylogenetic relationships within this genus have not been thoroughly investigated. This study reports the first comprehensive molecular phylogeny for this genus based on mitochondrial (Cytb) and nuclear gene (RAG1 and Rhod) DNA sequence data for all extant Seriola species (nine species, n=27). All species were found to be monophyletic based on Maximum parsimony, Maximum likelihood and Bayesian inference. The closure of the Tethys Sea (12-20 MYA) coincides with the divergence of a clade containing ((S. fasciata and S. peruana), S. carpenteri) from the rest of the Seriola species, while the formation of the Isthmus of Panama (±3 MYA) played an important role in the divergence of S. fasciata and S. peruana. Furthermore, factors such as climate and water temperature fluctuations during the Pliocene played important roles during the divergence of the remaining Seriola species. Copyright © 2015 Elsevier Inc. All rights reserved.

  13. Attachment-inducing capacities of fish skin epithelial extracts on oncomiracidia of Benedenia seriolae (Monogenea: Capsalidae).

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    Yoshinaga, Tomoyoshi; Nagakura, Tatsuhiro; Ogawa, Kazuo; Fukuda, Yutaka; Wakabayashi, Hisatsugu

    2002-03-01

    Attachment-inducing capacities of skin epithelial extracts of yellowtail, Japanese flounder and red sea bream on oncomiracidia of the monogenean Benedenia seriolae were examined. Clear differences were not detected in the capacity among the fish species, although B. seriolae infects only yellowtail and its congeners in Seriola. This suggests that either the capacity is not host specific or host-specific attachment-inducing capacity cannot be detected by the assay method. Further, the attachment-inducing capacities were suppressed by wheat-germ lectin and concanavalin A in skin epithelial extracts of Japanese flounder and yellowtail, respectively. This suggests that some sugar-related chemical substances existing in fish epithelia induce the attachment of B. seriolae oncomiracidia.

  14. A new species of Leporinus Agassiz, 1829 from the upper Rio Paraná basin (Characiformes, Anostomidae with redescription of L. elongatus Valenciennes, 1850 and L. obtusidens (Valenciennes, 1837

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    Heraldo A. Britski

    2012-01-01

    Full Text Available Leporinus obtusidens Valenciennes, 1837 and L. elongatus Valenciennes, 1850 are redescribed based on the type specimens, including those of their junior synonyms, and recently collected specimens. Leporinus obtusidens is considered to be widespread, occuring in the river drainages of La Plata, São Francisco, and Parnaíba. Leporinus aguapeiensis Campos, 1945, described from the upper Rio Paraná, and L. silvestrii Boulenger, 1902, described from the Rio Paraguay, are considered junior synonyms of L. obtusidens. Leporinus elongatus is endemic to the Rio Jequitinhonha and Rio Pardo, two eastern Brazilian river basins, and the locality cited for the lectotype, Rio São Fransico, likely to be erroneous. Leporinus crassilabris Borodin, 1929, and L. crassilabris breviceps Borodin, 1929, both described from the Rio Jequitinhonha, are considered junior synynoms of L. elongatus. A new species of Leporinus, endemic to the upper Rio Paraná, very similar and sometimes mistaken with L. obtusidens, is formally described. In addition, comments on Leporinus pachyurus Valenciennes, 1850 and on L. bimaculatus Castelnau, 1855 are provided, and a lectotype for L. bimaculatus is selected.

  15. Efecto del alimento vivo enriquecido en el desarrollo larvarío de huayaipe ( seriola mazatlana )

    OpenAIRE

    Darquea, Jodie; Blacio, Enrique; Townsend, Soraya

    2002-01-01

    Efecto del alimento vivo enriquecido en el desarrollo larvario de Huayaipe ( Seriola mazatlana ) Con una infraestructura ya existente,podemos reconocer ampliamente que tanto la camaronicultura como la industria pesquera debe buscar nuevas alternativas de diversificación, para la utilizacion de los recursos al máximo.

  16. Aspects of the trophic ecology of Liza falcipinnis (Valenciennes 1836)

    African Journals Online (AJOL)

    Aspects of the trophic ecology of Liza falcipinnis (Valenciennes) were studied in the Cross River Estuary (CRE) east of the Niger Delta (Nigeria). The trophic spectrum showed that L. falcipinnis fed on a wide variety of food resources. From the index of relative importance (IRI), L. falcipinnis fed primarily on diatoms, FPOM, ...

  17. Tres brotes de ictiosarcotoxicosis por ingestión de Sphyraena barracuda (Walbaum y Seriola zonata (Mitchill en el Caribe de Colombia

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    Ricardo Alvarez

    1999-03-01

    Full Text Available Se comentan los tres brotes de ictiosarcotoxicosis (ciguatera conocidos en las costas colombianas sobre el Mar Caribe, causados por la ingestión de la carne de los peces Sphyraena barracuda (Walbaum y Seriola dumerili (Mitchiil.

  18. Longfin yellowtail (SEriola rivoliana) larval rearing: skeletal development and effects of increasing dietary DHA levels at weaning phase

    OpenAIRE

    Mesa-Rodríguez, Antonio

    2017-01-01

    Programa de doctorado: Acuicultura: producción controlada de animales acuáticos [EN] Seriola rivoliana is considered as relevant species for aquaculture diversification and the information available is limited. The main objective of the present Thesis was to improve longfin yellowtail (S. rivoliana) larval production. In this sense, three specific objectives were established, in order to evaluate the most appropriate larval rearing technique, the obtention of bone development information a...

  19. "Così è morto Nerone". Un aneddoto storiografico in un manoscritto di Valenciennes

    OpenAIRE

    Bottiglieri, Corinna

    1998-01-01

    Questa indagine prende spunto dal reperimento, in due manoscritti di Valenciennes, provenienti dalla biblioteca del monastero di Saint-Amand, di una versione aneddotica della morte dell'imperatore Nerone, nella tradizione medievale primo persecutore dei Cristiani e precursore dell'Anticristo. Il racconto, intitolato "De obitu Neronis" o aperto semplicemente dall'incipit: "Nero Claudius ita obiit", si ritrova come glossa in commenti alla "Consolatio philosophiae" di Boezio. L'inedito rap...

  20. The occurrence of the Flying Fish, Hirundichthys speculiger (Valenciennes, 1847), in the North Sea (Pisces, Atheriniformes, Exocoetidae)

    NARCIS (Netherlands)

    Boer, P.; Nijssen, H.

    1972-01-01

    The occurrence of a specimen of the Flying Fish Hirundichthys speculiger (Valenciennes, 1847) in the North Sea is recorded. This is the first record of a member of the family Exocoetidae in the coastal waters of the Netherlands. The specimen is illustrated, and its occurrence in the North Sea is

  1. Three new species of the characid genus Cynopotamus Valenciennes, 1849, with remarks on the remaining species (Pisces, Characiformes)

    NARCIS (Netherlands)

    Menezes, Naercio A.

    1987-01-01

    Three new species of Cynopotamus Valenciennes, 1849 are described, C. gouldingi n. sp., C. juruenae n. sp. and C. tocantinensis n. sp. New diagnoses and synonymies are provided for most species of this genus as a consequence of the results from a study of recently collected specimens. A revised key

  2. Benzo[a]pyrene and Benzo[k]fluoranthene in Some Processed Fish and Fish Products

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    Olatunde S. Olatunji

    2015-01-01

    Full Text Available In this study, the concentration levels of the probable carcinogenic PAH fractions, benzo[a]pyrene (BaP and benzo[k]fluoranthrene (BkF in fillets of some processed fish species were investigated. Fish species comprising Merluccius poli (hake, Tyrsites atun (snoek, Seriola lalandi (yellow-tail and Brama brama (angel fish were bought in fish shops at Gordon’s Bay, Western Cape, South Africa. The fish were gutted, filleted and prepared for edibility by frying, grilling and boiling. Polycyclic aromatic hydrocarbons were extracted from each homogenized fish sample, cleaned-up using solid phase extraction (SPE, and analysed for the PAH fractions, BaP and BkF using a Gas Chromatograph coupled with a Flame Ionization Detector (GC-FID. The sum of the two PAHs (∑2PAH i.e., BaP and BkF ranged between 0.56 and 1.46 µg/kg, in all boiled, grilled and fried fish species. The fried fish extracts showed significantly higher (p < 0.05 abundance of ∑2PAH, than grilled and boiled fish. Dietary safety and PAHs toxicity was also discussed.

  3. Reproductive broodstock performance and egg quality of wild-caught and first-generation domesticated Seriola rivoliana reared under same culture conditions

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    Marcos F Quiñones-Arreola

    2015-11-01

    Full Text Available Almaco jack, Seriola rivoliana as well as some related species is of great interest in marine fish aquaculture. However, there are few studies about their reproduction in captivity. In this research work, reproductive performance and egg quality in two groups of adult Seriola rivoliana, caught in the wild and domesticated-F1 analyzed and compared, reared under optimal maturation conditions in a commercial private Laboratory. A total of 28 wild adult (>5 kg were caught at La Paz Bay, Baja California Sur, Mexico, and 30 adult domesticated-F1 broodstock (>5 kg, were obtained from an original stock of 1,000 juveniles (3.5 g body weight produced at Kona Blue (Hawaii, USA sea farm. Fishes were transported to the Rancheros del Mar commercial private hatchery, where they were grown to adult size. Both groups were evaluated during eight months (May to December 2012 and compared in terms of reproduction performance (total number of spawning events, monthly spawning frequency, total number of eggs, total number of eggs per mL, and fertilization rate, egg biochemical composition (total proteins, total lipids, total carbohydrates, and triacylglycerides and egg diameter. Results indicated that wild caught broostock showed a better reproductive performance in terms of fertilization rate, total number of spawning, monthly spawning frequency and total number of eggs produced. However, biochemical composition and egg diameter did not show statistical differences (P < 0.05 between two groups. The reproductive performance of broodstock and quality of eggs analyzed in this study are important traits to improve the aquaculture management of this species.

  4. Forced sustained swimming exercise at optimal speed enhances growth of juvenile yellowtail kingfish (Seriola lalandi

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    Arjan P. Palstra

    2015-01-01

    Full Text Available Swimming exercise at optimal speed may optimize growth performance of yellowtail kingfish in a recirculating aquaculture system. Therefore, optimal swimming speeds (Uopt in m s-1 or body lengths s-1, BL s-1 were assessed and then applied to determine the effects of long-term forced and sustained swimming at Uopt on growth performance of juvenile yellowtail kingfish. Uopt was quantified in Blazka-type swim-tunnels for 145 mm, 206 mm and 311 mm juveniles resulting in values of: 1 0.70 m s-1 or 4.83 BL s-1, 2 0.82 m s-1 or 3.25 BL s-1 and 3 0.85 m s-1 or 2.73 BL s-1. Combined with literature data from larger fish, a relation of Uopt (BL s-1 = 234.07(BL-0.779 (R2= 0.9909 was established for this species. Yellowtail kingfish, either forced to perform sustained swimming exercise at an optimal speed of 2.46 BL s-1 (‘swimmers’ or allowed to perform spontaneous activity at low water flow (‘resters’ in a newly designed 3,600 L oval flume (with flow created by an impeller driven by an electric motor, were then compared. At the start of the experiment, ten fish were sampled representing the initial condition. After 18 days, swimmers (n= 23 showed a 92% greater increase in BL and 46% greater increase in BW as compared to resters (n= 23. As both groups were fed equal rations, feed conversion ratio (FCR for swimmers was 1.21 vs. 1.74 for resters. Doppler ultrasound imaging showed a statistically significant higher blood flow (31% in the ventral aorta of swimmers vs. resters (44 ± 3 mL min-1 vs. 34 ± 3 mL min-1, respectively, under anesthesia. Thus growth performance can be rapidly improved by optimal swimming, without larger feed investments.

  5. Forced sustained swimming exercise at optimal speed enhances growth of juvenile yellowtail kingfish (Seriola lalandi)

    NARCIS (Netherlands)

    Palstra, A.P.; Mes, D.; Kusters, K.; Roques, J.A.C.; Flik, G.; Kloet, K.; Blonk, R.J.W.

    2015-01-01

    Swimming exercise at optimal speed may optimize growth performance of yellowtail kingfish in a recirculating aquaculture system. Therefore, optimal swimming speeds (U-opt in m s(-1) or body lengths s(-1), BL s(-1)) were assessed and then applied to determine the effects of long-term forced and

  6. Forced sustained swimming exercise at optimal speed enhances growth of juvenile yellowtail kingfish (Seriola lalandi).

    Science.gov (United States)

    Palstra, Arjan P; Mes, Daan; Kusters, Kasper; Roques, Jonathan A C; Flik, Gert; Kloet, Kees; Blonk, Robbert J W

    2014-01-01

    Swimming exercise at optimal speed may optimize growth performance of yellowtail kingfish in a recirculating aquaculture system. Therefore, optimal swimming speeds (U opt in m s(-1) or body lengths s(-1), BL s(-1)) were assessed and then applied to determine the effects of long-term forced and sustained swimming at U opt on growth performance of juvenile yellowtail kingfish. U opt was quantified in Blazka-type swim-tunnels for 145, 206, and 311 mm juveniles resulting in values of: (1) 0.70 m s(-1) or 4.83 BL s(-1), (2) 0.82 m s(-1) or 3.25 BL s(-1), and (3) 0.85 m s(-1) or 2.73 BL s(-1). Combined with literature data from larger fish, a relation of U opt (BL s(-1)) = 234.07(BL)(-0.779) (R (2) = 0.9909) was established for this species. Yellowtail kingfish, either forced to perform sustained swimming exercise at an optimal speed of 2.46 BL s(-1) ("swimmers") or allowed to perform spontaneous activity at low water flow ("resters") in a newly designed 3600 L oval flume (with flow created by an impeller driven by an electric motor), were then compared. At the start of the experiment, ten fish were sampled representing the initial condition. After 18 days, swimmers (n = 23) showed a 92% greater increase in BL and 46% greater increase in BW as compared to resters (n = 23). As both groups were fed equal rations, feed conversion ratio (FCR) for swimmers was 1.21 vs. 1.74 for resters. Doppler ultrasound imaging showed a statistically significant higher blood flow (31%) in the ventral aorta of swimmers vs. resters (44 ± 3 vs. 34 ± 3 mL min(-1), respectively, under anesthesia). Thus, growth performance can be rapidly improved by optimal swimming, without larger feed investments.

  7. Distribución de Sicydium Valenciennes 1837 (Pisces: Gobiidae) en México y Centro América

    OpenAIRE

    Lyons, John

    2005-01-01

    Gobies of the genus Sicydium Valenciennes are widespread in Mexico and Central America, but have a different distribution pattern on the Atlantic and Pacific slopes of the region. On the Pacific slope, where mountain ranges are found near the coast and the coastal plain is narrow, Sicydium is continuously distributed in rivers from Mazatlán, Sinaloa, Mexico, to central Panama. On the Atlantic slope, Sicydium is known from to three disjunct areas where coastal mountain ranges are present, cent...

  8. Identification of nurseries areas of juvenile Prochilodus lineatus (Valenciennes, 1836) (Characiformes: Prochilodontidae) by scale and otolith morphometry and microchemistry

    OpenAIRE

    Avigliano, Esteban; Fortunato, Roberta Callicó; Biolé, Fernanda; Domanico, Alejandro; Simone, Silvia De; Neiff, Juan J.; Volpedo, Alejandra V.

    2016-01-01

    ABSTRACT The streaked prochilod Prochilodus lineatus (Valenciennes) is a commercially freshwater species from South America, distributed in the Plata basin. In the present work the morphometry (circularity, rectangularity, form factor, OL/OW and ellipticity indices) and chemistry (Sr:Ca, Ba:Ca, Zn:Ca) of lapilli otolith, and geometric morphometry of scales of streaked prochilod juveniles, in two sites in the Plata basin (Uruguay River and Estrella Wetland), were compared to determine if they ...

  9. Anampses viridis Valenciennes 1840 (Pisces: Labridae)--a case of taxonomic con- fusion and mistaken extinction.

    Science.gov (United States)

    Russell, Barry C; Craig, Matthew T

    2013-01-01

    Anampses viridis Valenciennes 1840 is known from only three specimens collected from Mauritius, and despite intensive sampling, the species has not been seen or reported since it was originally described. This apparent failure to 'rediscover' A. viridis at Mauritius has led to speculation that it is extinct, and the species has been widely cited as an example of a marine fish extinction. Far from being extinct, Anampses viridis has been taxonomically confused and actually is the adult male (terminal phase) colour form and a junior synonym of A. caeruleopunctatus Rüppell 1829, a species that is common and widespread throughout the Indo-West Pacific region.

  10. The ultrastructure of the mullet Mugil curema Valenciennes (Teleostei, Mugilidae spermatozoa

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    Daura Regina Eiras-Stofella

    1993-01-01

    Full Text Available The structure of the spermatozoon of Mugil curema Valenciennes, 1836 was studied using scanning and transmission electron microscopy. The spermatic head is rounded and formed by the nucleus containing granular chromatin, firmly packed resulting in a mass extremely electron dense. The acrossome is absent. The midpiece is characterized by the presence of two centrioles, a plasmatic canal, very few vesicles, and several mitochondria (9-10 with aproximately 0.50µm in diameter. The head and the midpiece are aproximately 1.56µm in diameter. The flagellum conforms to the 9 + 0 flagellar pattern near the transition region in its midpiece and is 9 + 2 from there on up to the distal region of the axoneme. The electron density in the A tubules 1, 2, 5 and 6 shows the asymetry of this spermatozoa. Its spermatic cell differs ultrastructuraly from those of other Mugilidae species mainly because it has the highest number of mitochondria.

  11. Estádios evolutivos de tripanossomas de Hipostomus punctatus Valenciennes (Osteichthyes, Loricariidae em infecção natural de Batracobdella gemmata Blanchard (Hirudinea, Glossiphoniidae Evolutive stages of tripanosomes of Hipostomus punctatus Valenciennes (Osteichthyes, Loricariidae in natural infection of Batracobdella gemmata Blanchard (Hirudinea, Glossiphoniidae

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    Marta D'Agosto

    1993-01-01

    Full Text Available Seventeen leeches obtained from armoured catfish (Hypostomus punclatus Valenciennes, 1840 infected with Trypanosoma spp. were examined. It was observed the presence of tripomastigotes, epimastigotes and amastigotes forms as well as dividing forms in the proboscis and in the stomach, different from the ones found in the vertebrate host as regards the morfometric features and developing forms. The examination of the contents of rectum did not show tripanosomes. These facts seem to demonstrate that Batracobdella gemmata (Blanchard, 1900 is an invertebrate host of trypanosomes and the transmission is done by means of inoculation.

  12. The influence of finfish aquaculture on benthic fish and crustacean assemblages in Fitzgerald Bay, South Australia

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    Jason E. Tanner

    2015-09-01

    Full Text Available The influence of sea-cage aquaculture on wildfish assemblages has received little attention outside of Europe. Sea-cage aquaculture of finfish is a major focus in South Australia, and while the main species farmed is southern bluefin tuna (Thunnus maccoyii, there is also an important yellowtail kingfish (Seriola lalandi industry. Yellowtail kingfish aquaculture did not appear to have any local or regional effects on demersal assemblages (primarily fish, but also some crustaceans surveyed by baited remote underwater video (BRUV in Fitzgerald Bay. We did, however, detect small scale spatial variations in assemblages within the bay. The type of bait used strongly influenced the assemblage recorded, with significantly greater numbers of fish attracted to deployments where sardines were used as the bait to compared to those with no bait. The pelleted feed used by the aquaculture industry was just as attractive as sardines at one site, and intermediate between sardines and no bait at the other. There was significant temporal variability in assemblages at both farm sites and one control site, while the second control site was temporally stable (over the 9 weeks of the study. Overall, the results suggested that aquaculture was having little if any impact on the abundance and assemblage structure of the demersal macrofauna in Fitzgerald Bay.

  13. Comportamento reprodutivo do acará bandeira, Pterophyllum scalare Cuvier & Valenciennes (Osteichthyes, Cichlidae Reproductive behaviour of Pterophyllum scalare Cuvier & Valenciennes (Osteichthyes, Cichlidae

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    Maria do Socorro R.F Cacho

    1999-01-01

    Full Text Available Acará bandeira, Pterophyllum scalare Cuvier & Valenciennes, 1831 is a Neotropical cichlid fish, which has not been studied under a scientific approach. The objective of this work was to identify and describe the reproductive behaviour involved in the various phases of its reproductive cycle, such as territorial disputes and its establishment, substrate selection for spawning, courtship and mating, selection of mate and parental care. Twenty males and ten females of the study species were observed in the laboratory, over a period of six consecutive months. Behaviour descriptions resulting from these observations were analysed and the results show that the reproductive males are very agressive in the initial phase of reproduction. Agressiveness is a constant variable in encounters between territorial fishes, and possession of territory is of fundamental importance for reproduction of this species. Males with established territories were those which very successful in atracting the females during courtship. The selection of the females were influenced by the possession of territory, the type of substrate available for spawning and the body size. The fish preferred aquatic plants with broad leaves as an adequate substrate for spawning. It was observed that there was a short-term biparental care, before the eggs hatched, during which period the males played an important role in protecting them. After the eggs hatched, the male continued to protect the hatchling in his mouth, but played a lesser role, possibly to seek other females for mating so as to increase his reproductive output. Selection of a good mate by the female and the high degree of parental care were the factors which influence the reproductive success of the study species.

  14. Paraoxonase activity in sera from Piaractus mesopotamicus Holmberg (Characidae and Hypostomus punctatus Valenciennes (Siluridae

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    Vera Lucia F. Cunha Bastos

    1998-01-01

    Full Text Available A paraoxonase activity present in serum of two Brazilian fish species was consistently assayed at pH 8.5 using 7.5 mM paraoxon final concentration. The paraoxonase activity was more activated by 0.5 M NaCl in serum of Piaractus mesopotanricus Holmberg, 1887 (pacu than in serum of Hypostomus punctatus Valenciennes, 1840 (cascudo. Apparent values of K M were 3.3 x 10-3 M for cascudo and pacu paraoxonase activity in the presence of 0.5 M NaCl. Apparent maximum velocity values calculated in the presence of 0.5 M NaCl were 6.1 and 6.5 nmole/min/mL of serum for cascudo and pacu, respectively. Vmax/K M ratio values of determinations in the presence and absence of 0.5 M NaCl showed that NaCl had a more evident effect on increasing the affinity of serum paraoxonase for paraoxon in pacu serum. Young specimens of pacu showed a marked decreased paraoxonase serum activity when kept in tanks treated with 0.25 ppm methyl-parathion.

  15. Clonal structure in Ichthyobacterium seriolicida, the causative agent of bacterial haemolytic jaundice in yellowtail, Seriola quinqueradiata, inferred from molecular epidemiological analysis.

    Science.gov (United States)

    Matsuyama, T; Fukuda, Y; Sakai, T; Tanimoto, N; Nakanishi, M; Nakamura, Y; Takano, T; Nakayasu, C

    2017-08-01

    Bacterial haemolytic jaundice caused by Ichthyobacterium seriolicida has been responsible for mortality in farmed yellowtail, Seriola quinqueradiata, in western Japan since the 1980s. In this study, polymorphic analysis of I. seriolicida was performed using three molecular methods: amplified fragment length polymorphism (AFLP) analysis, multilocus sequence typing (MLST) and multiple-locus variable-number tandem repeat analysis (MLVA). Twenty-eight isolates were analysed using AFLP, while 31 isolates were examined by MLST and MLVA. No polymorphisms were identified by AFLP analysis using EcoRI and MseI, or by MLST of internal fragments of eight housekeeping genes. However, MLVA revealed variation in repeat numbers of three elements, allowing separation of the isolates into 16 sequence types. The unweighted pair group method using arithmetic averages cluster analysis of the MLVA data identified four major clusters, and all isolates belonged to clonal complexes. It is likely that I. seriolicida populations share a common ancestor, which may be a recently introduced strain. © 2016 John Wiley & Sons Ltd.

  16. Persistence of external signs in Pacific herring Clupea pallasii Valenciennes with ichthyophoniasis

    Science.gov (United States)

    Hart, Lucas M.; Conway, Carla M.; Elliott, Diane G.; Hershberger, Paul K.

    2016-01-01

    The progression of external signs of Ichthyophonus infection in Pacific herring Clupea pallasii Valenciennes was highly variable and asynchronous after intraperitoneal injection with pure parasite preparations; however, external signs generally persisted through the end of the study (429 days post-exposure). Observed signs included papules, erosions and ulcers. The prevalence of external signs plateaued 35 days post-exposure and persisted in 73–79% of exposed individuals through the end of the first experiment (147 days post-exposure). Among a second group of infected herring, external signs completely resolved in only 10% of the fish after 429 days. The onset of mortality preceded the appearance of external signs. Histological examination of infected skin and skeletal muscle tissues indicated an apparent affinity of the parasite for host red muscle. Host responses consisted primarily of granulomatous inflammation, fibrosis and necrosis in the skeletal muscle and other tissues. The persistence and asynchrony of external signs and host response indicated that they were neither a precursor to host mortality nor did they provide reliable metrics for hindcasting on the date of exposure. However, the long-term persistence of clinical signs in Pacific herring may be useful in ascertaining the population-level impacts of ichthyophoniasis in regularly observed populations.

  17. Sanguinicola platyrhynchi n. sp. (Digenea: Sanguinicolidae parasite of visceral cavity of Hemisorubim platyrhynchos (Valenciennes, 1840 (Pisces: Pimelodidae from the floodplain of the upper Paraná River, Brazil

    Directory of Open Access Journals (Sweden)

    GUIDELLI G. M.

    2002-01-01

    Full Text Available A new species is of the genus Sanguinicola Plehn, 1905 described, Sanguinicola platyrhynchi n. sp., digenetic parasite of visceral cavity of Hemisorubim platyrhynchos (Valenciennes, 1840 from the floodplain of the upper Paraná River, Brazil. The species has been thus included because of the presence of separate dorsal genital pores, while differing from other species of the same genus mainly in digestive apparatus features, genital pore position, and infection site. Emendation of generic diagnosis is included.

  18. The feeding ecology of Aphanius fasciatus (Valenciennes, 1821 in the lagoonal system of Messolongi (western Greece

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    Ioannis Leonardos

    2008-06-01

    Full Text Available The Mediterranean toothcarp Aphanius fasciatus (Valenciennes, 1821 is a small-sized omnivorous estuarine fish. Its diet is dominated by juveniles of shrimps (Palaemon adspersus, Isopods, Branchiopoda, Bivalvia, eggs of invertebrates, mosquitoes (adults and larvae and diatoms. An ontogenetic diet shift with an increase in mean prey size with fish length was observed. Smaller fish feed on planktonic prey (e.g. copepods, ostracods, nauplii of Artemia, while larger fish prefer larger and more benthic preys (e.g. ampipods, Bivalvia. The diet of A. fasciatus shows a high degree of seasonal variation, with a reduction in the feeding activity during the periods of adverse environmental conditions (winter and autumn. It is a well-adapted estuarine fish, its feeding mode and preferences depending on the preys that are available. Its feeding strategy is characterised by specialisation in different resource types (aquatic invertebrates and mosquitoes and a high between-phenotype contribution (BPC to niche width, with specialised individuals showing little or no overlap in resource use.

  19. Weight-length Relationships, Gonadosomatic Indeces, Sex Ratios and Relative Weight of the Omani-Indian Oil sardine, Sardinella longiceps (Valenciennes1847) from Al-Seeb Area; Sultanate of Oman

    OpenAIRE

    Al-Jufaili Saud

    2011-01-01

    This study presents the weight-length relationship and spawning period of the Omani Indian Oil sardine Sardinella longiceps (Valenciennes 1847) which inhabits the near shore zone along the Omani coast. A total of 1744 specimens were collected between January 1997 to February 1998 from Al-Seeb; a suburban area situated by the sea in Muscat, Oman. Samples were obtained on a monthly basis from beach seine and gillnet catches. The female to male sex ratio was obtained to be 0.6. The monthly varia...

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

    Science.gov (United States)

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

    2013-12-01

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

  1. Estudo anatômico comparativo da região cefálica pré-branquial de Sphyrna lewini (Griffith & Smith) e Rhizoprionodon lalandii (Valenciennes) (Elasmobranchii, Carcharhiniformes) relacionados com a presença do cefalofólio em Sphyrna Rafinesque Anatomical study on the pre branchial region of Sphyrna lewini (Griffith & Smith) and Rhizoprionodon lalandii (Valenciennes) (Elasmobranchii, Carcharhiniformes) related with the cephalofoil in Sphyrna Rafinesque

    OpenAIRE

    Maisa da Cruz Lima; Ulisses Leite Gomes; Wallace de Souza-Lima; Cristina Paragó

    1997-01-01

    A comparative study on the pre-branchial cranial anatomy of the scalloped hammerhead sharks [Sphyrna lewini (Griffith & Smith, 1834)] and the Brazilian sharpnose shark [Rhizoprionodon lalandii (Valenciennes, 1839)] was carried out to check the modification in the musculature, inervation and optic stalk related to the appearance of the cephalofoil in Sphyrna Rafinesque, 1810. A total of seven adults and one juvenile of R. lalandii and eight juveniles of S. lewini were examined. In S. lewini th...

  2. Prevalence and histopathology of Neoechinorhynchus curemai Noronha, 1973 (Acanthocephala: Neoechinorhynchidae in Prochilodus lineatus Valenciennes, 1836 from Volta Grande Reservoir, MG, Brazil

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    M. L. MARTINS

    Full Text Available The present work studied the prevalence and histopathology of Neoechinorhynchus curemai Noronha, 1973 (Acanthocephala: Neoechinorhynchidae from curimbatá, Prochilodus lineatus Valenciennes, 1836. Eighteen fishes with averages of 46.7 + 1.1 cm length and 1,674.8 + 75.6 g weight were collected with net, bimonthly from December 1995 thru December 1996 in the hydroelectric power station of Volta Grande Reservoir (Cemig, Minas Gerais, Brazil. From analysed fishes, 15 were infected with acanthocephalans in the intestine (prevalence 83.3%. The greatest mean intensity occurred in August 1996 with 66.5 (16 to 208 parasites. Histopathological analysis showed complete desquamation of the intestinal epithelium with severe hyperplasia and hypertrofia of the goblet cells. Severe inflammatory reaction at the submucosa, displacement of their sheaf, associated with oedema and mononuclear and eosinophilic infiltration were observed.

  3. Effects of Pro-Tex on zebrafish (Danio rerio) larvae, adult common carp (Cyprinus carpio) and adult yellowtail kingfish (Seriola lalandi)

    NARCIS (Netherlands)

    Boerrigter, J.G.J.; Vis, van de J.W.; Bos, van den R.; Abbink, W.; Spanings, T.; Zethof, J.; Louzao Martinez, L.; Andel, van W.F.M.; Lopez-Luna, J.; Flik, G.

    2014-01-01

    Aquaculture practices bring several stressful events to fish. Stressors not only activate the hypothalamus–pituitary–interrenal-axis, but also evoke cellular stress responses. Up-regulation of heat shock proteins (HSPs) is among the best studied mechanisms of the cellular stress response. An extract

  4. Identification, Molecular Cloning of IL-1β and Its Expression Profile during Nocardia seriolae Infection in Largemouth Bass, Micropterus salmoides

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    Ping-Yueh Ho

    2016-10-01

    Full Text Available In the present study, IL-1β cDNA was identified and analyzed from largemouth bass (Micropterus salmoides. Full length IL-1β mRNA was obtained using Rapid Amplification of cDNA Ends (RACE, which contains 78 bp 3′-UTR, a 455 bp 5′-UTR, and an open reading frame (ORF of 702 bp coding for 233 amino acid residues. The molecular weight and theoretical isoelectric point of largemouth bass IL-1β protein was predicted to be 26.7 kDa and 6.08 respectively. A largemouth bass IL-1β phylogenetic analysis showed a close relation to the IL-1βs of striped trumpeter (Latris lineata, Chinese perch (Siniperca chuatsi, and Japanese sea bass (Lateolabrax japonicus. Peptidoglycan upregulated IL-1β in the spleen and head kidney, while lipopolysaccharide upregulated detectable levels of IL-1β in the spleen only. Largemouth bass, challenged with Nocardia seriolae (1.0 × 106 cfu/mL, showed a significant increase in IL-1β at 3 and 5 days post infection (dpi in the spleen, while in the head kidney significant expression was found at 2 and 3 dpi, peaking at 3 dpi. Furthermore, tumor necrosis factor α (TNF-α showed significantly higher expression in the spleen at 3 and 5 dpi, and in the head kidney at 1 and 3 dpi, with expression decreasing at 5 dpi in both tissues.

  5. Applying acoustic telemetry to understand contaminant exposure and bioaccumulation patterns in mobile fishes.

    Science.gov (United States)

    Taylor, Matthew D; van der Meulen, Dylan E; Brodie, Stephanie; Cadiou, Gwenaël; Knott, Nathan A

    2018-06-01

    Contamination in urbanised estuaries presents a risk to human health, and to the viability of populations of exploited species. Assessing animal movements in relation to contaminated areas may help to explain patterns in bioaccumulation, and assist in the effective management of health risks associated with consumption of exploited species. Using polychlorinated dibenzodioxin and polychlorinated dibenzofuran (PCDD/Fs) contamination in Sydney Harbour estuary as a case study, we present a study that links movement patterns resolved using acoustic telemetry to the accumulation of contaminants in mobile fish on a multi-species basis. Fifty-four individuals across six exploited species (Sea Mullet Mugil cephalus; Luderick Girella tricuspidata; Yellowfin Bream Acanthopagrus australis; Silver Trevally Pseudocaranx georgianus; Mulloway Argyrosomus japonicus; Yellowtail Kingfish Seriola lalandi) were tagged with acoustic transmitters, and their movements tracked for up to 3years. There was substantial inter-specific variation in fish distribution along the estuary. The proportion of distribution that overlapped with contaminated areas explained 84-98% of the inter-specific variation in lipid-standardised biota PCDD/F concentration. There was some seasonal variation in distribution along the estuary, but movement patterns indicated that Sea Mullet, Yellowfin Bream, Silver Trevally, and Mulloway were likely to be exposed to contaminated areas during the period of gonadal maturation. Acoustic telemetry allows examination of spatial and temporal patterns in exposure to contamination. When used alongside biota sampling and testing, this offers a powerful approach to assess exposure, bioaccumulation, and potential risks faced by different species, as well as human health risks associated with their consumption. Crown Copyright © 2017. Published by Elsevier B.V. All rights reserved.

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

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    Nelson Colihueque

    2017-09-01

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

  7. Circadian changes in thyroid hormones of piau, Leporinus obtusidens Valenciennes, 1847 (Osteichthyes, Anostomidae after feeding = Variações circadianas dos hormônios tireoidianos de piau, Leporinus obtusidens Valenciennes, 1847 (Osteichthyes, Anostomidae após alimentação

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    Walter Dias Junior

    2009-10-01

    Full Text Available To evaluate circadian changes in thyroid hormones of piau, Leporinusobtusidens Valenciennes, 1847, (Osteichthyes, Anostomidae after feeding were determined the plasma levels of thyroid hormones (TH of 128 fishes, same age, immature, both sexes, distributed into four classes of weight. They were kept in 16 aquaria (100 L, with artificial aeration and 2 L min.-1 water flow, from March to August, 1996, in Aquaculture Station of the Universidade Federal de Lavras (UFLA. Daily, feed was supplied at 5% body weight. For blood samples, the fishes were anesthetized with benzocaine 10%, and plasmatic levels of TH were determined at 1, 4, 7, 10, 13, 16 and 22h after food supply during 4 consecutive days in June and in August, period of lowest temperature. The classes of weight 63, 75, 82and 91 g were considered homogeneous, showing that plasmatic concentrations of T3 and T4 were body weight independent for this fish species. The daily cycle of plasma TH were correlated with feed intake, reaching the highest levels 7 h after feeding supply (T3 = 1.75 ± 0.07 ng mL-1 and T4 = 14.9 ± 1.59 ng mL-1. It was also possible to verify that the daily intake is directly correlated with water temperature which is affected by day-light cycle.Para avaliar as variações circadianas dos hormônios tireoidianos do piau, Leporinus obtusidens Valenciennes, 1847, (Osteichthyes, Anostomidae após alimentação, foram determinados os níveis plasmáticos dos hormônios tireoidianos (HT T3 e T4 de 128 peixes, de mesma idade, imaturos, ambos os sexos, distribuídos em quatro classes de peso e mantidos em 16 aquários (100 L, com aeração artificial e fluxo constante de água de 2 L min.-1, de março a agosto de 1996, na Estação de Aquicultura da Universidade Federal de Lavras (UFLA. Diariamente, a ração foi fornecida a 5% do peso corporal. Nas pesagens e amostragens de sangue, os animais foram anestesiados com benzocaína a 10% e os níveis plasmáticos dos HT foram

  8. Correlated Effects of Ocean Acidification and Warming on Behavioral and Metabolic Traits of a Large Pelagic Fish

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    Taryn D. Laubenstein

    2018-05-01

    Full Text Available Ocean acidification and warming are co-occurring stressors, yet their effects on early life stages of large pelagic fishes are not well known. Here, we determined the effects of elevated CO2 and temperature at levels projected for the end of the century on activity levels, boldness, and metabolic traits (i.e., oxygen uptake rates in larval kingfish (Seriola lalandi, a large pelagic fish with a circumglobal distribution. We also examined correlations between these behavioral and physiological traits measured under different treatments. Kingfish were reared from the egg stage to 25 days post-hatch in a full factorial design of ambient and elevated CO2 (~500 µatm and ~1000 µatm and temperature (21 °C and 25 °C. Activity levels were higher in fish from the elevated temperature treatment compared with fish reared under ambient temperature. However, elevated CO2 did not affect activity, and boldness was not affected by either elevated CO2 or temperature. Both elevated CO2 and temperature resulted in increased resting oxygen uptake rates compared to fish reared under ambient conditions, but neither affected maximum oxygen uptake rates nor aerobic scope. Resting oxygen uptake rates and boldness were negatively correlated under ambient temperature, but positively correlated under elevated temperature. Maximum oxygen uptake rates and boldness were also negatively correlated under ambient temperature. These findings suggest that elevated temperature has a greater impact on behavioral and physiological traits of larval kingfish than elevated CO2. However, elevated CO2 exposure did increase resting oxygen uptake rates and interact with temperature in complex ways. Our results provide novel behavioral and physiological data on the responses of the larval stage of a large pelagic fish to ocean acidification and warming conditions, demonstrate correlations between these traits, and suggest that these correlations could influence the direction and pace of

  9. Neoechinorhynchus (Neoechinorhynchus) chimalapasensis n. sp. (Acanthocephala: Neoechinorhynchidae) from the freshwater fish Awaous banana (Valenciennes) (Gobiidae) in Mexico.

    Science.gov (United States)

    Salgado-Maldonado, Guillermo; Caspeta-Mandujano, Juan Manuel; Martínez-Ramírez, Emilio

    2010-03-01

    Neoechinorhynchus (Neoechinorhynchus) chimalapasensis n. sp. (Eoacanthocephala: Neoechinorhynchidae) is described from the intestine of Awaous banana (Valenciennes) (Pisces: Gobiidae) collected in the Río Negro, a tributary in the upper Río Coatzacoalcos basin, Santa María Chimalapa, Oaxaca State, Mexico. It is the third species of Neoechinorhynchus Stiles & Hassall, 1905 described from Mexican freshwater fishes, although 36 other species are known from freshwater fishes in the Americas. Like four other species of Neoechinorhynchus from freshwater fishes in North America and Mexico, N. (N.) limi Muzzall & Buckner, 1982, (N.) rutili (Müller, 1780) Stiles & Hassall, 1905, N. (N.) salmonis Ching, 1984 and N. (N.) roseus Salgado-Maldonado, 1978, males and females of the new species are less than 20 mm in length, lack conspicuous sexual dimorphism in size, have a small proboscis of about 0.1 mm in length with the largest hooks being the anteriormost, about 30-90 microm in length and of equal size, and have subequal lemnisci, larger than the proboscis receptacle but still relatively short and, in males, generally restricted to a position considerably anterior to the testes. The new species is closest to N. (N.) roseus, but it is distinguished from it by having: (1) a slightly larger cylindrical proboscis with almost parallel sides versus a globular proboscis with a rounded tip which is shorter and somewhat wider in N. (N.) roseus; (2) smaller but robust anterior proboscis hooks that do not reach the equatorial level or extend beyond the hooks of the middle circle as in N. (N.) roseus; and (3) the female gonopore situated ventrally subterminal, as opposed to being a significant distance anteriorly to the posterior extremity in N. (N.) roseus.

  10. Notes on Gobioid fishes : 6. On the synonymy of some species from the Indo-Australian Archipelago

    NARCIS (Netherlands)

    Koumans, F.P.

    1935-01-01

    Bathygobius fuscus (Rüpp.) Gobius fuscus Rüppell, Atl. Reise N. Afr. Fische 1828, p. 137. Gobius punctillatus Rüppell, l.c., p. 138. Gobius soporator Cuvier & Valenciennes, Hist. Nat. Poissons XII. 1837, p. 56. Gobius albopunctatus Cuvier & Valenciennes, l.c., p. 57. Gobius nebulopunctatus Cuvier &

  11. Identity and distribution of southern African sciaenid fish species of ...

    African Journals Online (AJOL)

    Two Umbrina species, U. canariensis Valenciennes 1843 and U. robinsoni Gilchrist and Thompson 1908, are recognised from southern Africa. The latter species was hitherto believed to be a synonym of Umbrina ronchus Valenciennes 1843 (type locality Canary Islands). U. canariensis is distributed along the South Africa ...

  12. Estudo anatômico comparativo da região cefálica pré-branquial de Sphyrna lewini (Griffith & Smith e Rhizoprionodon lalandii (Valenciennes (Elasmobranchii, Carcharhiniformes relacionados com a presença do cefalofólio em Sphyrna Rafinesque Anatomical study on the pre branchial region of Sphyrna lewini (Griffith & Smith and Rhizoprionodon lalandii (Valenciennes (Elasmobranchii, Carcharhiniformes related with the cephalofoil in Sphyrna Rafinesque

    Directory of Open Access Journals (Sweden)

    Maisa da Cruz Lima

    1997-01-01

    Full Text Available A comparative study on the pre-branchial cranial anatomy of the scalloped hammerhead sharks [Sphyrna lewini (Griffith & Smith, 1834] and the Brazilian sharpnose shark [Rhizoprionodon lalandii (Valenciennes, 1839] was carried out to check the modification in the musculature, inervation and optic stalk related to the appearance of the cephalofoil in Sphyrna Rafinesque, 1810. A total of seven adults and one juvenile of R. lalandii and eight juveniles of S. lewini were examined. In S. lewini the levator palaliquadrati and the levator labii superioris were the most modified cephalic muscles, as they became dorsalventrally attached and laterally developed. Among the oculomotor muscles, the recti followed the lateral expansion of the head constituting the rectal stalk associated with the nerves II, III, IV and VI and the optic stalk. It was observed that the oculomolorius branch "a" does not inervate the adductor mandibulae as it was mentioned in a previous paper. The myological structures and the inervation pattern presented diagnostic characters. Despite the shared characters between Carcharhinidae and the Sphyrnidae, the cephalofoil represents an autapomorphy which includes all the hammerhead sharks in the family Sphyrnidae.

  13. Species Profiles. Life Histories and Environmental Requirements of Coastal Fishes and Invertebrates (South Florida). WHITE MULLET.

    Science.gov (United States)

    1985-05-01

    of the head Class ............ .Osteichthyes length. Order .... .......... Perciformes - Family .... ........... Mugilidae REASON FOR INCLUSION IN...SERIES Geographic range: Atlantic and East- The white mullet, the second most ern Pacific; in the Western Atlantic common species of the family Mugilidae ...del ciclo de Rep. 55(34):1-15. vida de MugiI curema Valenciennes in Cuviere- Valenciennes, 1836 Moore, R. H. 1973. Energetic re- ilisces: Mugilidae

  14. Anatomia funcional e morfometria dos intestinos e dos cecos pilóricos do teleostei (pisces de água doce Brycon orbignyanus (Valenciennes, 1849

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    Seixas Filho José Teixeira de

    2000-01-01

    Full Text Available O objetivo do presente trabalho foi estudar a anatomia funcional e a morfometria comparativas nos intestinos médio e posterior e nos cecos pilóricos da piracanjuba (Brycon orbignyanus Valenciennes, 1849 (Characiformes, Characidae, Bryconinae. Foram conduzidos estudos anatomofuncionais e morfométricos nos intestinos médio e posterior e nos cecos pilóricos dessa espécie com hábito alimentar onívoro. Constatou-se, por meio destes estudos, que o padrão de enrolamento das alças intestinais em arranjo em N apresentou, na segunda classe de tamanho, freqüentes variações no intestino médio, mas foi compatível com os de outras espécies de hábitos alimentares similares. Os estudos da morfometria mostraram que o comprimento total do intestino e das alças intestinais e seus calibres, provavelmente, exercem função específica na absorção dos nutrientes. As relações entre o arranjo das pregas da mucosa e a velocidade de transporte do alimento no intestino médio sugerem que os padrões transversal e oblíquo retardam o avanço do alimento em sentido aboral, possibilitando maior período digestivo e melhor aproveitamento dos nutrientes, contribuindo para a preparação do bolo fecal. O comprimento e o calibre dos cecos pilóricos aumentam com o desenvolvimento do peixe, e o seu padrão de mucosa possui características anatômicas semelhantes às do intestino.

  15. Variabilidad Oceanográfica en el Ecuador y su utilización para la planificación de la maricultura oceánica de las especies Pargo, Lutjanus guttatus, y Huayaipe, Seriola rivoliana

    Directory of Open Access Journals (Sweden)

    Jhonny Chavarría

    2016-04-01

    Full Text Available Existe una relación directa entre el comportamiento de las especies marinas y las condiciones oceanográficas en las que se desarrollan, lo cual hace indispensable un análisis de tales condiciones para la planificación y análisis de factibilidad técnica y ambiental de proyectos de maricultura. El mar ecuatoriano por encontrarse a ambos lados de la línea ecuatorial, y en el lado oriental del Océano Pacífico, presenta particularidades que deben ser consideradas y que pueden, en una fase inicial, ser abordadas desde la descripción de las masas de agua y la macro circulación de la zona como los ejes principales que caracterizan sus aguas. Aun cuando las aguas ecuatorianas son consideradas como propicias para el cultivo de especies tropicales como Pargo, Lutjanus guttatus, y Huayaipe, Seriola rivoliana, en estructuras confinadas mar afuera, la planificación de una maricultura oceánica sostenible debe considerar la variabilidad climática local que, a diferencia de otros países del Pacífico Sudeste, se manifiesta principalmente en la dirección latitudinal, con influencia prolongada de aguas subtropicales en el sector sur. Este trabajo muestra a través del análisis de la variabilidad oceanográfica ecuatoriana, distintos escenarios, en escalas espaciales y temporales, que pudieran representar mejores condiciones para el desarrollo de la maricultura oceánica, o en el otro extremo posibles escenarios de riesgo.

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

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    Renato Ribeiro Nogueira Ferraz

    2014-09-01

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

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

    OpenAIRE

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

    1998-01-01

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

  18. Variabilidad de las comunidades de parásitos metazoos del róbalo Eleginops maclovinus (Cuvier & Valenciennes, 1830 (Pisces: Eleginopidae en Chile Variability of metazoan parasite communities in the rock cod Eleginops maclovinus (Cuvier & Valenciennes, 1830 (Pisces: Eleginopidae off Chile

    Directory of Open Access Journals (Sweden)

    MARIO GEORGE-NASCIMENTO

    2009-06-01

    Full Text Available La comparación de las variaciones en el tiempo cronológico y en el espacio es uno de los aspectos menos estudiados en la ecología de las comunidades de parásitos. Por eso, en este estudio se compara la abundancia total, riqueza y composición de las infracomunidades de parásitos del róbalo Eleginops maclovinus (Cuvier & Valenciennes, 1830 (Pisces: Eleginopidae, entre muestras tomadas en Chile centro-sur en tres localidades geográficas (Talcahuano, Puerto Montt y Punta Arenas, y en dos momentos del tiempo en cada una de ellas. En el conjunto de las 126 infracomunidades examinadas se encontraron 18 taxa de parásitos. La abundancia total y la composición de las infracomunidades se modificaban con la ontogenia del hospedador. Sin embargo, se encontró que la variación entre años en una localidad es de similar magnitud a la que hay entre lugares geográficos, luego de corregir por el efecto de la ontogenia del hospedador. Estos resultados resaltan la necesidad de implementar diseños de muestreo más rigurosos al momento de usar a los parásitos como marcadores biológicos de las poblaciones de hospedadores. Se propone que futuros estudios en las fuentes de variación de las comunidades de parásitos mejoren la descripción de estas variaciones con diseños de muestreo con medidas replicadas en el tiempo y el espacio.Comparison of variations in both chronological time and space is one of the least studied subjects in the ecology of parasite communities. Thus, we compared the abundance, richness and composition of parasite infracommunities in the rock cod Eleginops maclovinus (Cuvier & Valenncienes, 1830 (Pisces: Eleginopidae, between three widely separated localities along south-central Chile (Talcahuano, Puerto Montt and Punta Arenas, which were sampled in two different years each. Eighteen parasite taxa were taxonomically determined in the 126 hosts examined. Total abundance and infracommunity composition changed along host ontogeny

  19. Alterações histopatológicas em fígado de dourado Salminus maxillosus Valenciennes, 1840 (Osteichthyes, Characidae causadas por Neocucullanus neocucullanus Travassos, Artigas & Pereira 1828 (Nematoda “Dourado”, Salminus maxillosus Valenciennes, 1840 (Osteichthyes, Characidae liver histopatologic alterations caused by Neocucullanus neocucullanus Travassos, Artigas & Pereira 1828 (Nematoda

    Directory of Open Access Journals (Sweden)

    Antenor Aguiar Santos

    2002-05-01

    Full Text Available Foram capturados 293 exemplares de Salminus maxillosus Valenciennes, 1840, (Osteichthyes, Characidae no rio Mogi-Guaçu, Cachoeira de Emas, de agosto de 1996 a dezembro de 1997. Amostras de fígado de 45 exemplares que apresentaram parasitos, Neocucullanus neocullanus Travassos, Artigas e Pereira, 1928 (prevalência de 15,35%, foram fixadas em Bouin e processadas para inclusão em parafina. Cortes de 5 µm foram corados por HE, Tricrômico de Mallory e submetidos ao PAS contracorados com Hematoxilina. Macroscopicamente nos fígados que se apresentavam parasitados, havia infecção nas regiões centrais e periféricas, algumas vezes com perfuração do estroma do órgão, permitindo visão do cisto externamente. Microscopicamente e circunscrito à região da instalação do parasito, encontrou-se desorganização intensa do tecido, com células típicas de processo inflamatório ativo e de uma discreta deposição de fibrina ao redor do foco inflamatório. Justaposto ao parasito há a cápsula delgada constituída por fibroblastos e fibras colágenas. A presença de leucócitos e o encapsulamento do parasito demonstram um processo inflamatório agudo.From August 1996 to December 1997, 293 specimens of Salminus maxillosus were captured in the Mogi-Guaçu river, at Cachoeira de Emas, municipality of Pirassununga, state of São Paulo, Brazil. The livers of 45 fishes were parasitized by Neocucullanus neocucullanus Travassos, Artigas and Pereira, 1928 (15.35% prevalence. Liver samples were fixed in Bouin and processed for paraffin inclusion. 5µm-sections were stained with ME, Mallory trichromic and submitted to Hematoxilin-contrasted PAS. Macroscopically, the parasitized livers had central and peripheral infection, sometimes perforating the stroma, allowing the cyst to be seen externally. Microscopically, and only surrounding the parasite, intense tissue disorganization, with typical active inflammatory process cells, and discrete fibrin deposition

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

    Directory of Open Access Journals (Sweden)

    Huyse Tine

    2011-06-01

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

  1. Gene banking of the neotropical fish Leporinus obtusidens (Valenciennes, 1836): a protocol to freeze its sperm in the field.

    Science.gov (United States)

    Taitson, P F; Chami, E; Godinho, H P

    2008-05-01

    A practical sperm cryopreservation protocol using a dry-shipper and a diluent of simple composition is described for the neotropical fish Leporinus obtusidens (Valenciennes, 1836). The cooling rate of the dry-shipper and its period of useful time, established under laboratory conditions, were respectively 25.7-30.8 degrees C/min (between 0 and -60 degrees C) and 9 days after charging. Sperm donors were selected on the basis of their hyperemic genital papilla and the ability to ooze milt under gentle manual pressure, during the reproductive months of November to January. Milt volume (1.3+/-0.3 mL; n=9 fish), fresh sperm motility rate (93.3+/-2.5%; n=6 fish), and sperm concentration (10.9+/-3.0 x 10(9)spermatozoa/mL of milt) were obtained. The sperm cryopreservation experiments were conducted with the following cryoprotectants (all at 10%, before mixing with milt): dimethyl sulphoxide (DMSO; n=10 fish), methanol (n=6 fish), propanediol (n=6 fish) and ethylene glycol (n=5 fish). Glucose (5%) and hen's egg yolk (10%) made up the diluents containing DMSO, ethylene glycol or propanediol. Milk powder (10%) replaced hen's egg yolk in the diluent containing methanol. Distilled water (up to 100%) completed the diluent solutions. Milt freezing (in 0.5-mL straws) was performed in the dry-shipper after 1:5 (milt:diluent) dilution. Thawed sperm cryopreserved in DMSO-containing diluent and activated by 119 mM NaHCO(3) gave the highest motility rate (62+/-14%). The fertilizing capacity of L. obtusidens sperm was tested using the combination of DMSO-containing diluent as the cryoprotectant and 119 mM NaHCO(3) as the activating solution. Oocytes were obtained from artificial spawning and fertilized with different proportions of spermatozoa. The greatest rate of fertilization (74%) occurred when the ratio of about 112,000 motile spermatozoa:oocyte was used. Thus, a protocol to freeze L. obtusidens sperm can be elaborated as follows. Milt (fish(-1)) was readily available only in

  2. Redescription of the Indo-Pacific scorpionfish Scorpaenodes guamensis (Quoy & Gaimard 1824) (Scorpaenidae), a senior synonym of seven nominal species.

    Science.gov (United States)

    Motomura, Hiroyuki; Causse, Romain; Struthers, Carl D

    2016-01-21

    The Indo-Pacific scorpionfish, Scorpaenodes guamensis (Quoy & Gaimard 1824), is redescribed on the basis of 137 specimens, including types, from a wide geographic range in the Indo-Pacific. Seven nominal species, Scorpaena rubropunctata Cuvier in Cuvier & Valenciennes 1829, Sebastes minutus Cuvier in Cuvier & Valenciennes 1829, Scorpaena chilioprista Rüppell 1838, Scorpaena polylepis Bleeker 1851, Centropogon echinatus Macleay 1881, Scorpaena erinacea Garman 1903, and Scorpaenopsis quiescens Seale 1906, are regarded here as junior synonyms of S. guamensis. The type status of these nominal species is discussed, and lectotypes of Scorpaena guamensis, Scorpaena rubropunctata, Sebastes minutus, and Scorpaena polylepis are herein designated. Validity of Scorpaenopsis scaber (Ramsay & Ogilby 1886) is also discussed.

  3. Draft Genome Sequences of the Fish Pathogen Vibrio harveyi Strains VH2 and VH5

    DEFF Research Database (Denmark)

    Castillo, Daniel; D'Alvise, Paul; Middelboe, Mathias

    2015-01-01

    Vibrio harveyi is an important marine pathogen that is responsible for vibriosis outbreaks in cultured fish and invertebrates worldwide. Here, we announce the draft genome sequences of V. harveyi strains VH2 and VH5, isolated from farmed juvenile Seriola dumerili during outbreaks of vibriosis...... in Crete, Greece....

  4. Variations in stomach contents and biochemical composition of tissues in some marine fishes

    Digital Repository Service at National Institute of Oceanography (India)

    Jacob, P.G.; Rajagopal, M.D.

    Relationship between calorific values and protein, fat and carbohydrate of the stomach contents (food) and body tissues of marine fishes, Sardinella longiceps, Valenciennes, Rastrelliger kanagurta (Cuvier), Otolithus ruber (Schneider) and Lactarius...

  5. 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

  6. Presencia de juveniles de tiburón aletinegro Carcharhinus limbatus (Carcharhiniformes: Carcharhinidae en la zona norte de la ecoregión Tayrona, Caribe colombiano Presence of young blacktip sharks Carcharhinus limbatus (Carcharhiniformes: Carcharhinidae in the north area of the Tayrona ecoregion, Colombian Caribbean

    Directory of Open Access Journals (Sweden)

    Juan Gaitán-Espitia

    2008-01-01

    Full Text Available Se registra la presencia de dos juveniles de Carcharhinus limbatus (Valenciennes, 1839 capturados por pescadores artesanales en el sector de la desembocadura del río Don Diego (11°18'N-73°43'W al norte de la zona de influencia del Parque Nacional Natural Tayrona en el Caribe colombiano. Este constituye el primer registro de la especie para el área local y se describen los ejemplares examinados.The presence of two young Carcharhinus limbatus (Valenciennes, 1839 is documented. The individuals were collected by artisanal fishers in the area around the Don Diego River mouth (11°18'N-73°43'W at the north of the Tayrona National Natural Park influence zone in the Colombian Caribbean. This is the first record of this species in the area. The specimens examined are described herein.

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

    NARCIS (Netherlands)

    Isbrücker, I.J.H.; Nijssen, H.

    1976-01-01

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

  8. Quatro especies nuevas de nematodos del sur del Perú y redescripción de Hedruris Orestiae Moniez, 1889 Four new species of nematodes from southern Peru, with a redescription of Hedruris orestiae Moniez, 1889

    Directory of Open Access Journals (Sweden)

    Nicanor Ibâñez H.

    1976-01-01

    Full Text Available En el estudio helmintológico de anfibios del género Telmatobius Wiegmann, 1834, y del pez Orestias luteus Valenciennes, 1839, de las zonas de Arequipa, Puno y del Lago Titicaca, se han encontrado nematodes de los géneros Hedruris Nitzsch, 1821 y Falcaustra Lane, 1915. Se redescribe Hedruris orestiae Moniez, 1889 y se describen cuatro especies nuevas: Hedruris moniezi sp. n., Falcaustra condorcanquii sp. n., Falcaustra pumacahuai sp. n. y Falcaustra tiahuanaquensis sp. n.The collection of large numbers of nematodes from amphibians (Telmatobius sp. and fish Orestias luteus Valenciennes, 1839 Arequipa, Puno, and Titicaca Lake in South Peru has made possible the revision of one species and the description of our new species: Hedruris orestiae Moniez, 1889 is re-described; Hedruris moniezi sp. n., Falcaustra condorcanquii sp. n., Falcaustra pumacahuai sp. and Falcaustra tiahuanaquensis sp. n. are described.

  9. Skoulekia erythrini n. sp (Digenea: Aporocotylidae): a parasite of Pagellus erythrinus (L.) (Perciformes: Sparidae) from the western Mediterranean with an amendment of the generic diagnosis

    Czech Academy of Sciences Publication Activity Database

    Palacios-Abella, J. F.; Georgieva, Simona; Mele, S.; Raga, J. A.; Isbert, W.; Kostadinova, Aneta; Montero, F. E.

    2017-01-01

    Roč. 94, č. 6 (2017), s. 669-688 ISSN 0165-5752 R&D Projects: GA ČR(CZ) GBP505/12/G112 Institutional support: RVO:60077344 Keywords : southern bluefin tuna * blood flukes digenea * trematoda aporocotylidae * life-cycle * maximum-likelihood * sequence alignment * seriola-dumerili * cardicola * paradeontacylix Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine OBOR OECD: Veterinary science Impact factor: 1.181, year: 2016

  10. [Secure cupboards, an advantage for the medicine use pathway].

    Science.gov (United States)

    Leclercq, Amandine; Foqué, Carole

    2016-05-01

    At Valenciennes general hospital, for some patients, the medicine use pathway is made secure through the use of computer systems which ensure named-patient daily dispensing. Secure cupboards are a complement to this main pathway. Copyright © 2016. Publié par Elsevier Masson SAS.

  11. Flexible job shop scheduling problem in manufacturing

    OpenAIRE

    Curralo, Ana; Pereira, Ana I.; Barbosa, José; Leitão, Paulo

    2013-01-01

    This paper addresses a real assembly cell: the AIP-PRIMECA cell at the Université de Valenciennes et du Hainaut-Cambrésis, in France. This system can be viewed as a Flexible Job Shop, leading to the formulation of a Flexible Job Shop Scheduling Problem (FJSSP).

  12. Trap Fishery and Reproductive Biology of the Whitespotted ...

    African Journals Online (AJOL)

    reproductive biology of the rabbit fish Siganus sutor (Valenciennes 1835). Trap catch ... way to facilitate sustainable exploitation of the rabbitfishes and other reef fishes in the DMRs. ... abundance of target species manifested by decreases in sizes and catch per unit effort (CPUE) within ... MATERIALS AND METHODS.

  13. The Length-Weight Relationship, Condition Factor and ...

    African Journals Online (AJOL)

    The length–weight relationship (LWR), condition factor (K), sex ratio, gonadosomatic index (GI) and hepatosomatic index (HI) of 412 specimens of Pseudotolithus senegalensis (Valenciennes, 1833) from Tombo a coastal fishing community in the western rural district of Sierra Leone were studied for twelve months. Samples ...

  14. Length-Weight Relationship and Condition Factor (K constant) of ...

    African Journals Online (AJOL)

    Abstract—Length-weight relationships and condition factors of Sparidae along the. Kenyan coast are unknown. This study investigated the length-weight relationship and condition factor of Dentex maroccanus Valenciennes, 1830, a sparid, found in. Malindi, Kenya, from June to August 2008. The length-weight coefficients ...

  15. Food and Feeding Habits of Catfish (Synodontis nigrita Cuvier And ...

    African Journals Online (AJOL)

    acer

    ABSTRACT:The food and feeding habits of Synodontis nigrita (Cuvier and Valenciennes) from. River Rima were ... (2005) studied the food habits of. Synodontis ... Phytoplankton families, Chlorophyceae and ... with r values of almost 1 in all the regression equations. ... often influences gut length (Smith, 1980). Perhaps the ...

  16. The effects of varying sampling intervals on the growth and survival ...

    African Journals Online (AJOL)

    Four different sampling intervals were investigated during a six-week outdoor nursery management of Heterobranchus longifilis (Valenciennes, 1840) fry in outdoor concrete tanks in order to determine the most suitable sampling regime for maximum productivity in terms of optimum growth and survival of hatchlings and ...

  17. Cucullanid nematodes (Nematoda: Cucullanidae) from deep-sea marine fishes off New Caledonia, including Dichelyne etelidis n. sp.

    Science.gov (United States)

    Moravec, František; Justine, Jean-Lou

    2011-02-01

    Three nematode species of the family Cucullanidae, intestinal parasites of marine perciform fishes, are reported from off New Caledonia: Cucullanus bourdini Petter & Le Bel, 1992 from the crimson jobfish Pristipomoides filamentosus (Valenciennes) and the goldflag jobfish Pristipomoides auricilla (Jordan, Evermann & Tanaka) (new host record) (both Lutjanidae); Dichelyne etelidis n. sp. from the deep-water red snapper Etelis carbunculus Cuvier (type-host) and the deep-water longtail red snapper Etelis coruscans Valenciennes (both Lutjanidae); and Dichelyne sp. (only one female) from the trumpet emperor Lethrinus miniatus (Forster) (Lethrinidae). Detailed light and electron microscopical studies revealed in C. bourdini some taxonomically important, previously unreported features, such as the location of the excretory pore, nature of the vulva and the size of fully-developed eggs. The new species, D. etelidis, is characterised mainly by the length of the spicules (462-748 μm), a single intestinal caecum, the location of the deirids and excretory pore, the arrangement of the genital papillae and the host group.

  18. Napoléon Coste: componist en gitarist in het muziekleven van het 19e-eeuwse Parijs

    NARCIS (Netherlands)

    Vliet, A.C. van

    2015-01-01

    Born in 1805 as the son of an officer in the Napoleonic army, Coste went to Delfzijl, Holland with his father as a child of 8. In 1813 the French withdrew from this fortress, passing the Zuiderzee and the Rhine. Later, he would dedicate his Souvenirs to these places. He grew up in Valenciennes,

  19. Napoléon Coste : componist en gitarist in het muziekleven van het 19e-eeuwse Parijs

    NARCIS (Netherlands)

    Vliet, A.C. van

    2015-01-01

    Born in 1805 as the son of an officer in the Napoleonic army, Coste went to Delfzijl, Holland with his father as a child of 8. In 1813 the French withdrew from this fortress, passing the Zuiderzee and the Rhine. Later, he would dedicate his Souvenirs to these places. He grew up in Valenciennes,

  20. Gyrodactylus aff. mugili Zhukov, 1970 (Monogenoidea: Gyrodactylidae) from the gills of mullets (Mugiliformes: Mugilidae) collected from the inland waters of southern Iraq, with an evalutation of previous records of Gyrodactylus spp. on mullets in Iraq.

    Science.gov (United States)

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

    2013-11-01

    Gyrodactylus aff. mugili Zhukov, 1970 (Monogenoidea: Gyrodactylidae) is recorded and described from the gill lamellae of 11 of 35 greenback mullet, Chelon subviridis (Valenciennes) (minimum prevalence 31%), from the brackish waters of the Shatt Al-Arab Estuary in southern Iraq. The gyrodactylid was also found on the gill lamellae of one of eight Speigler's mullet, Valamugil speigleri (Bleeker), from the brackish waters of the Shatt Al-Basrah Canal (minimum prevalence 13%). Fifteen Klunzinger's mullet, Liza klunzingeri (Day), and 13 keeled mullet, Liza carinata (Valenciennes), collected and examined from southern Iraqi waters, were apparently uninfected. The gyrodactylids from the greenback mullet and Speigler's mullet were considered to have affinity to G. mugili Zhukov, 1970, and along with G. mugili may represent members of a species complex occurring on mullets in the Indo-Pacific Region. A single damaged gyrodactylid from the external surfaces of the abu mullet, Liza abu (Heckel), was insufficient for species identification. Previously identified species of Gyrodactylus recorded on L. abu in Iraq by various authors were considered possible misidentifications or accidental infections.

  1. Author Details

    African Journals Online (AJOL)

    Chikou, A. Vol 84 (2014) - Articles Effet de densité initiale de mise en charge sur la survie et la croissance des larves d'Heterobranchus longifilis (Valenciennes, 1840) élevées en bassins fertilisés. Abstract PDF · Vol 94 (2015) - Articles Development and bioefficacy study of plant-based proteins diets for juvenile African ...

  2. The sagittal otolith morphology of four selected mugilid species from Iranian waters of the Persian Gulf (Teleostei: Mugilidae)

    OpenAIRE

    Vahideh Salehi; Majid Askari Hesni; Azad Teimori; Mohammad Reza Lashkari

    2016-01-01

    The members of mugilid species are usually difficult to recognize because of the well-known similarity observed in their external morphology. Nevertheless, their identification is very important for local fisheries management and conservation action. Therefore, in the present study we applied otolith morphology to evaluate its significance in identification of four selected mugilid species; Chelon subviridis (Valenciennes, 1836), Liza klunzingeri (Day, 1888), Ellochelon vaigiensis (Quoy & Gai...

  3. Rhadinorhynchus oligospinosus n. sp. (Acanthocephala, Rhadinorhynchidae) from mackerels in the Pacific Ocean off Peru and related rhadinorhynchids in the Pacific, with notes on metal analysis.

    Science.gov (United States)

    Amin, Omar M; Heckmann, Richard A

    2017-01-01

    Specimens of a new species of Rhadinorhynchus Lühe, 1911 are described from the chub mackerel Scomber japonicus (Scombridae) and the Chilean Jack mackerel Trachurus murphyi (Carangidae) (possibly a subspecies of Trachurus symmetricus) from the Pacific Ocean off the Peruvian coast at the Port of Chicama, La Libertad. Specimens of Rhadinorhynchus oligospinosus n. sp. are somewhat small having 11-14 rows of alternating proboscis hooks with 20-22 hooks each with posteriormost hooks in a continuous ring. Ventral hooks are robust with prominent roots but dorsal hooks are slender and shorter with discoid roots. Trunk spines are in two zones separated by a non-spiny region. Anterior trunk spines are in 2-3 complete circles but posterior spines are only ventral and lateral, and do not extend posterior to the level of the posterior end of the proboscis receptacle in both sexes. The new species is closest to Rhadinorhynchus seriolae (Yamaguti, 1963) Golvan, 1969 found in Japanese and Australian waters, but not as close to 19 other species found in the same Pacific waters off Australia, Japan, and Vietnam. In R. seriolae, posterior trunk spines extend well past the receptacle in females, among other diagnostic differences. Proboscis hooks of the new species were analyzed for chemical elements using X-ray in conjunction with EDAX (energy-dispersive analysis for X-ray) software; sulfur had a higher concentration at the edge than the middle of cut hooks. © O.M. Amin et al., published by EDP Sciences, 2017.

  4. Ciguatera fish poisoning on the West Africa Coast: An emerging risk in the Canary Islands (Spain).

    Science.gov (United States)

    Boada, Luis D; Zumbado, Manuel; Luzardo, Octavio P; Almeida-González, Maira; Plakas, Steven M; Granade, Hudson R; Abraham, Ann; Jester, Edward L E; Dickey, Robert W

    2010-12-01

    Ciguatera fish poisoning (CFP) is endemic in certain tropical and subtropical regions of the world. CFP had not been described on the West Africa Coast until a 2004 outbreak in the Canary Islands. In 2008-2009, two additional outbreaks of ciguatera occurred. Individuals afflicted had consumed lesser amberjack (Seriola rivoliana) captured from nearby waters. Caribbean ciguatoxin-1 (C-CTX-1) was confirmed in fish samples by LC-MS/MS. Ciguatoxic fish in this region may pose a new health risk for the seafood consumer. Copyright © 2010 Elsevier Ltd. All rights reserved.

  5. Obtenção de proteases a partir do trato digestivo de peixes neotropicais para aplicação na produção de peptídeos de colágeno

    OpenAIRE

    OLIVEIRA, Vagne de Melo

    2015-01-01

    Este trabalho objetivou obter proteases com propriedades colagenolíticas a partir dos resíduos de três espécies de peixes neotropicais (arabaiana Seriola dumerili; pescada-branca Cynoscion leiarchus; e tucunaré Cichla ocellaris), através de extração por sistema de duas fases aquosas (SDFA), visando aplicá-lo para produção de peptídeos de colágeno. Inicialmente, serino proteases foram extraídas e caracterizadas físico-quimicamente quanto à temperatura e pH ótimos, bem como estabilidade à varia...

  6. Taxonomic Study of Suborder Calcaxonia (Alcyonacea: Octocorallia: Anthozoa) from King Sejong Station, Antarctic

    OpenAIRE

    Jun-Im Song; Sung-Jin Hwang; Haewon Moon; In-Young An

    2012-01-01

    Some gorgonians in the families, Primnoidae and Isididae within the suborder Calcaxonia were collected from subtidal zones between depths of 10 and 45 m in the coastal regions of King Sejong Station (62??13′S, 058?? 47′W), Korea Polar Research Institute of Korea Ocean Research and Development Institute (KORDI) by SCUBA diving from 2009 to 2011. Three species in the Primnoidae, Arntzia gracilis (Molander, 1929), Thouarella (Thouarella) antarctica (Valenciennes, 1846) and Onogorgia nodosa (Mola...

  7. Mathematical model of human osteon and its validation by nanomechanical testing of bone lamella

    Czech Academy of Sciences Publication Activity Database

    Korsa, R.; Lukeš, J.; Šepitka, J.; Kytýř, Daniel; Mareš, T.

    2014-01-01

    Roč. 17, SUPP. 1 (2014), s. 24-25 ISSN 1025-5842. [Congress of the Societe-de-Biomecanique /39./. Valenciennes, 27.08.2014-29.08.2014] R&D Projects: GA ČR(CZ) GAP105/10/2305 Institutional support: RVO:68378297 Keywords : osteon * lamella * micromechanics * elastic constants * nanoindentation Subject RIV: JJ - Other Materials Impact factor: 1.770, year: 2014 http://www.tandfonline.com/doi/abs/10.1080/10255842.2014.931078#.VBq66E0cRaQ

  8. Reproductive biology and pollination of Aechmea distichantha Lem. (Bromeliaceae Biologia reprodutiva e polinização em Aechmea distichantha Lem. (Bromeliaceae

    Directory of Open Access Journals (Sweden)

    Gilson João Scrok

    2011-09-01

    Full Text Available Reproductive biology, including phenology, flower biology, pollination, and the reproductive system in the bromeliad Aechmea distichantha were studied in an Araucaria forest in the state of Paraná. Phenology and reproduction in terricolous plants were followed in October 2006 and May - October of 2007. Flowering peaked from June to September and fruiting was from June to October. Flower anthesis lasted one day. Flowers were pollinated the most by the hummingbird Stephanoxis lalandi and the most common butterfly visitor was Lychnuchoides ozias ozias. Nectar concentration declined during anthesis, while nectar volume was constant. Aechmea distichantha is self-compatible with 30-45% fruit formation in self-pollination tests. Sunlight influences reproduction: when controlling for bromeliad and inflorescence size, plants in sunlight produced more seeds per fruit than plants in the shade. Reproduction was also associated with inflorescence size when controlling for bromeliad size. That is, larger inflorescences in similar sized plants produced more flowers and more seeds per fruit.A biologia reprodutiva, incluindo fenologia, biologia floral, polinização e sistemas reprodutivos foram estudados em Floresta com Araucária no Paraná. A fenologia e reprodução de plantas terrícolas foram acompanhadas em outubro 2006 e de maio a outubro de 2007. O pico de floração ocorreu de junho a setembro e a frutificação de junho a outubro. A antese durou um dia. As flores foram polinizadas principalmente por Stephanoxis lalandi e a borboleta mais freqüente foi Lychnuchoides ozias ozias. A concetração de nectar declinou durante a antese, enquanto que o volume de néctar permaneceu constante. Aechmea distichantha é auto-compatível com 30-45% de frutificação nos testes de autopolinização. A luz solar influenciou a reprodução: quando controlados o tamanho das bromélias e das inflorescências, plantas no sol produziram mais sementes por frutos que

  9. Estudo dos vestígios de peixes dos sítios arqueológicos da área de influência da Usina Hidrelétrica Machadinho, Rio Grande do Sul, Brasil A study of fish traces taken from the archaeological sites of the areas surrounding the Machadinho Hydroelectric power station, Rio Grande do Sul, Brazil

    Directory of Open Access Journals (Sweden)

    Cláudio Ricken

    2009-09-01

    Full Text Available The analysis of the material obtained in the rescue of archaeological sites in the area surrounding the Hydroelectric Plant of Machadinho, Rio Grande do Sul, revealed that a considerable amount of bones and fish scales incorporated in the alimentary remains. Using an osteological collection as reference, we identified remains of Salminus brasiliensis (Cuvier, 1816 (Characidae, Brycon orbignyanus (Valenciennes, 1849 (Characidae, Pogonopoma obscurum Quevedo & Reis, 2002 (Loricariidae, Hemiancistrus fuliginosus Cardoso & Malabarba, 1999, Prochilodus lineatus (Valenciennes, 1836 (Prochilodontidae, Schizodon sp. (Anostomidae, Leporinus sp. (Anostomidae, Hoplias sp. (Erythrinidae, Hypostomus sp. (Loricariidae and Crenicichla sp. (Cichlidae. Based on specimens from fish collections, regressions were obtained comparing the size of the pre-maxillary bone in Crenicichla spp. and the length of the pectoral fin spine of Hemiancistrus fuliginosus, Pogonopoma obscurum and Hypostomus spp, with the standard length and weight of corresponding specimens. The estimated size and weight of the specimens obtained from fish remains in the archaeological sites varied between 79.7-153.9 mm and 13.5-33.9 g for Hemiancistrus fuliginosus, 158.2-151.0 mm and 179.5-194.3 g for Pogonopoma obscurum, 117.1-166.2 mm and 86.6-93.1 g for Crenicichla spp., and 62.2-397.2 mm and 34-20.3 g for Hypostomus spp. Therefore using these estimates of standard lengths and weights it was possible to formulate a hypotheses on the fishing technology used by the inhabitants of these sites.

  10. [Fatty acid composition of edible marine fish in Zhoushan, Zhejiang province].

    Science.gov (United States)

    Gao, Yi-xiong; Yue, Bing; Yu, Xin-wei; He, Jia-lu; Shang, Xiao-hong; Li, Xiao-wei; Wu, Yong-ning

    2013-06-01

    To analyze the main fatty acids in edible marine fish from Zhoushan, Zhejiang province. From September to October 2011, a total of 186 edible marine fish (31 species,6 individual fishes/species) were collected in local markets. Total lipids of edible part were extracted by Folch's method and fatty acids were separated and quantified by gas chromatographic after the homogenization of edible part. The differences of composition of n-6 polyunsaturated fatty acid (n-6 PUFA), n-3 polyunsaturated fatty acid (n-3 PUFA),saturated fatty acid (SFA) and monounsaturated fatty acid (MUFA) among fishes were analyzed. Among the 31 fishes, total lipids were highest in Auxis thazard ((13.2 ± 1.2)g/100 g edible part) and lowest in Thamnaconus modestus ((0.6 ± 0.1)g/100 g edible part). Total n-6 PUFA were highest in Mugil cephalus ((875.7 ± 506.4)mg/100 g edible part) and lowest in Seriola quinqueradiata((2.1 ± 1.9)mg/100 g edible part). Total n-3 PUFA were highest in Auxis thazard ((2623.8 ± 426.1)mg/100 g edible part) and lowest in Scoliodon sorrakowah ((82.0 ± 13.9)mg/100 g edible part). SFA were highest in Trachinotus ovatus((3014.9 ± 379.0)mg/100 g edible part) and lowest in Seriola quinqueradiata ((89.7 ± 5.8)mg/100 g edible part). MUFA were highest in Coilia nasus ((3335.7 ± 383.5)mg/100 g edible part) and lowest in Thamnaconus modestus ((32.1 ± 16.9)mg/100 g edible part). There were significant differences of composition of total lipids and of fatty acids among 31 edible marine fish species from Zhoushan.

  11. La pesquería de tiburones oceánicos-costeros en los litorales de Colima, Jalisco y Michoacán

    Directory of Open Access Journals (Sweden)

    Angélica Cruz

    2011-06-01

    Full Text Available La pesquería de tiburón es una de las más importantes en el Pacífico mexicano, en la actualidad no se cuentan con los datos de la composición específica de las capturas de las diferentes flotas. En el presente trabajo se describen aspectos biológicos-pesqueros de las especies de tiburón, capturadas por la flota palangrera de mediana altura del puerto de Manzanillo, en un periodo anual de abril 2006-abril 2007, los muestreos se realizaron mensualmente a bordo de estas embarcaciones. La composición de las capturas estuvo representada por nueve especies (n=1 962, de las cuales Carcharhinus falciformis (Bibron, 1839 (88.12% sostiene esta pesquería y en segundo lugar Prionace glauca (Linnaeus, 1758 (8.21%. Las especies poco frecuentes fueron Sphyrna zygaena (Linnaeus, 1758 con (1.78%, Alopias pelagicus (Nakamura, 1935 (0.82%, Carcharhinus longimanus (Poey, 1861 (0.45%, Alopias superciliosus (Lowe, 1839 (0.35%, Carcharhinus leucas (Valenciennes, 1839 (0.1%, Carcharhinus limbatus (Valenciennes, 1839 (0.1% é Isurus oxyrinchus (Rafinesque, 1810 (0.05%. La fecundidad estimada para C. falciformis fue de 3-7 crías/hembra con tallas de 30-45cm LT; 40.57+2.03cm LT y P. glauca con 5-52 crías/hembra, con tallas de 5-18.6cm LT; 11.61±0.21cm LT. Por lo tanto se asume que C. falciformis presenta un ciclo concurrente y P. glauca probablemente un ciclo bianual consecutivo.

  12. Les oiseaux chanteurs. Sciences, pratiques sociales et représentations en Europe du Moyen Âge à nos jours

    Directory of Open Access Journals (Sweden)

    Corinne Beck et Martine Clouzot

    2011-08-01

    Full Text Available « Les oiseaux chanteurs » est un projet pluridisciplinaire, transversal et international, initié et porté par l’UMR 5594 ARTeHIS de l’université de Bourgogne et l’UMR Calhiste de l’université de Valenciennes. Ce projet consiste à élargir une thématique déjà étudiée par les ornithologues, les éthologues, les littéraires et les musicologues, à d’autres disciplines a priori éloignées, dont les problématiques centrales touchent essentiellement aux domaines des sciences du vivant, de l’environneme...

  13. Desarrollo de la sagitta en juveniles y adultos de Odontesthes argentinensis (Valenciennes, 1835 y O. bonariensis (Valenciennes, 1835 de la provincia de Buenos Aires, Argentina (Teleostei: Atheriniformes Development of the sagitta in young and adults of Odontesthes argentinensis (Valenciennes, 1835 and Odontesthes bonariensis (Valenciennes, 1835 from Buenos Aires province, Argentina (Teleostei: Atheriniformes

    Directory of Open Access Journals (Sweden)

    ANDREA D TOMBARI

    2005-12-01

    Full Text Available Se describió el desarrollo del otolito Sagitta de juveniles y adultos de Odontesthes argentinensis procedentes de Punta Rasa (36°22' S y Miramar (38°16' S y de Odontesthes bonariensis de la Laguna de Chascomús (35° 36' S. Se estudió, la morfología de las sagittae de ambas especies, analizando cuatro grupos morfológicos para O. argentinensis (I: 75-120 mm, II: 130-220 mm, III: 230-270 y IV: 280-320 mm y tres grupos morfológicos para O. bonariensis (I: 80-120 mm, II: 130-220 y III: 230-320 mm. Las características morfológicas comunes a la sagitta, de ambas especies, en los grupos estudiados son: presencia de sulcus, depresión areal dorsal en la cara medial, cara lateral con estrías y la presencia de un punto culminante en el borde dorsal. En la sagitta de O. argentinensis, la depresión areal dorsal se inicia ligada a la cauda, característica que permitió distinguir claramente entre otolitos de juveniles de ambas especies. A partir del estado adulto, la depresión areal dorsal se halla separada de la cauda en las dos especies y el análisis estadístico evidenció un crecimiento discontinuo. Se hallaron diferencias morfológicas entre pares de sagitta de un mismo individuo en cuanto a la forma del ostium, presencia de cisura, rostro y punto culminante, aunque no se halló significancia morfométricaThe development of the otolith sagitta was described in young and adults of two silverside species. Odontesthes argentinensis was collected from Punta Rasa (36°22' S and Miramar (38°16' S and, Odontesthes bonariensis collected from Laguna de Chascomús (35°36' S. Sagitta morphology was studied in both species, analyzing four morphological groups of O. argentinensis (I: 75-120 mm, II: 130-220 mm, III: 230-270 mm and IV: 280-320 mm and three morphological groups of O. bonariensis (I: 80-120 mm, II: 130-220 mm and III: 230-320 mm. The morphological features of the sagitta shared by both species are: sulcus present, dorsal areal depression on the medial face, lateral face with striations and the presence of the culminant point on the dorsal margin. The dorsal areal depression of O. argentinensis begins in contact with the cauda. This feature easily identifies the sagittae of young in both species. The dorsal areal depression is separated from the cauda in adults of both species, and the statistical analysis showed a discontinuous growth. Morphological differences were found between pairs of sagittae of the same specimen relating to the shape of the ostium, presence of an anterior excisure, rostrum and the culminant point, but no significant morphometric difference was found

  14. Repetitive sequences: the hidden diversity of heterochromatin in prochilodontid fish

    Directory of Open Access Journals (Sweden)

    Maria L. Terencio

    2015-08-01

    Full Text Available The structure and organization of repetitive elements in fish genomes are still relatively poorly understood, although most of these elements are believed to be located in heterochromatic regions. Repetitive elements are considered essential in evolutionary processes as hotspots for mutations and chromosomal rearrangements, among other functions – thus providing new genomic alternatives and regulatory sites for gene expression. The present study sought to characterize repetitive DNA sequences in the genomes of Semaprochilodus insignis (Jardine & Schomburgk, 1841 and Semaprochilodus taeniurus (Valenciennes, 1817 and identify regions of conserved syntenic blocks in this genome fraction of three species of Prochilodontidae (S. insignis, S. taeniurus, and Prochilodus lineatus (Valenciennes, 1836 by cross-FISH using Cot-1 DNA (renaturation kinetics probes. We found that the repetitive fractions of the genomes of S. insignis and S. taeniurus have significant amounts of conserved syntenic blocks in hybridization sites, but with low degrees of similarity between them and the genome of P. lineatus, especially in relation to B chromosomes. The cloning and sequencing of the repetitive genomic elements of S. insignis and S. taeniurus using Cot-1 DNA identified 48 fragments that displayed high similarity with repetitive sequences deposited in public DNA databases and classified as microsatellites, transposons, and retrotransposons. The repetitive fractions of the S. insignis and S. taeniurus genomes exhibited high degrees of conserved syntenic blocks in terms of both the structures and locations of hybridization sites, but a low degree of similarity with the syntenic blocks of the P. lineatus genome. Future comparative analyses of other prochilodontidae species will be needed to advance our understanding of the organization and evolution of the genomes in this group of fish.

  15. Update on Fish Disease Situation in Italy

    DEFF Research Database (Denmark)

    Vendramin, Niccolò; Toffan, A.

    2012-01-01

    In this presentation we provide a general overview of the aquatic animal health issues related to the aquaculture sector and wild environment in Italy in 2011. Considering saltwater species European sea bass (Dicentrarchus labrax) and Gilthead sea bream (Sparus aurata) are still the most widely...... (Thunnus thynnus) and amberjack (Seriola dumerilii) for which some breeding/reproduction plans have been attempted by some hatcheries. The farming of sea bass and sea bream is affected by the presence of several important diseases. Firstly considering Bacterial diseases, Marine Flexibacteriosis, caused...... main pathological scenarios are present. Farms with low water temperature (mainly located in the mountains) can be more affected and damaged by viral diseases (i.e. viral haemorrhagic septicaemia VHS) which is one of the most important problem. Rainbow trout fry syndrome (RTFS) is responsible...

  16. Neoparaseuratum travasssosi, n. g., n. sp. (Nematoda: Quimperiidae, a new parasite from thorny catfish Pterododas granulosus in Brazil

    Directory of Open Access Journals (Sweden)

    F. Moravec

    1992-01-01

    Full Text Available A new nematode genus and species. Neoparaseuratum travassosi n. g., n. sp., is described from the intestine of the freshwater thorny catfish, Pterodoras granulosus (Valenciennes, from the Paraná River, Brazil. This seuratoid nematode species represents a new genus of the family Quimperiidae, being characterized mainly by the presence of numerous narrow longitudinal bands of inflated cuticle extending along the cephalic region of the body, small deirids, postoesophageal position of the excretory pore, relatively short (0.159-0.303 mm, equal spicules and a gubernaculum, the absence of caudal alae and preanal sucker in the male, and by some other features.

  17. Feeding of Pellona flavipinnis (Clupeiformes, Pristigasteridaein a Central Amazonian floodplain Dieta de Pellona flavipinnis (Clupeiformes, Pristigasteridae em planície alagada da Amazônia Central

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    Sandra S. Moreira-Hara

    2009-06-01

    Full Text Available The feeding habits of Pellona flavipinnis (Valenciennes, 1836 at Catalão, a floodplain area on the Brazilian Central Amazon was studied. Data was obtained during three hydrological cycles, between September 1999 and September 2003. Diet composition, daily and seasonal variation in the feeding activity and the relationship between predator's size and its prey were analyzed. Almost 80% of the food consumed has autochthonous origin and diet was composed basically by insects and fish. Juvenile fish predominated in the stomach contents of all size classes but there was no significant relationship between predator's size and its prey. Pellona flavipinnis may be considered a carnivorous species which feeds mainly on juvenile (young-of-the-year specimens of other fish. More intense feeding activity occurred at night and in the high water period.Os hábitos alimentares de Pellona flavipinnis (Valenciennes, 1836 de uma área de várzea na Amazônia Central, Catalão, foram estudados. Foram utilizados dados referentes a três ciclos hidrológicos, entre setembro de 1999 e setembro de 2003. Foram analisados a dieta, a atividade alimentar diária e sazonal e a relação entre o comprimento da presa e o do predador. Cerca de 80% dos alimentos consumidos eram de origem autóctone e a dieta composta basicamente de insetos e peixes. Peixes juvenis predominaram nos conteúdos estomacais de exemplares de todas as classes de tamanho, mas não houve relação significativa entre o tamanho do predador e o das presas consumidas. Pellona flavipinnis pode ser considerada uma espécie carnívora que se alimenta principalmente de indivíduos juvenis de outras espécies de peixes. A atividade alimentar foi maior durante a noite e no período da cheia.

  18. A note on the occurrence of praniza larvae of Gnathiidae (Crustacea, Isopoda on fishes from Northeast of Pará, Brazil

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    Daniel G. Diniz

    2008-12-01

    Full Text Available The infection of the estuarine teleost fishes Mugil gaimardianus Desmarest, 1831 (Mugilidae, Arius phrygiatus Valenciennes, 1839 (Ariidae, Conodon nobilis Linnaeus, 1759 (Haemulidae, Cetengraulis edentulus Cuvier, 1829 (Engraulidae, and Anableps anableps Linnaeus, 1758 (Anablepidae by praniza larvae of Gnathiidae (Crustacea, Isopoda was studied in specimens fished off the Atlantic Ocean in Northeast of Pará State, near Bragança, Brazil. The highest infection prevalence value was found in Anableps anableps (42.3% and the lowest in Conodon nobilis (9.1%. The mean intensity varied from 1 parasitein Conodon nobilis to 19.5 in Arius phrygiatus. A description of the larvae is provided. The morphology of the mouthparts is related to the blood sucking activity, and is compared with the characteristics of other gnathiidae species.Foi estudada a parasitose dos peixes estuarinos Mugil gaimardianus Desmarest, 1831 (Mugilidae, Arius phrygiatus Valenciennes, 1839 (Ariidae, Conodon nobilis Linnaeus, 1759 (Haemulidae, Cetengraulis edentulus Cuvier, 1829 (Engraulidae, e Anableps anableps Linnaeus, 1758 (Anablepidae por larvas praniza de Gnathiidae (Crustacea, Isopoda em exemplares pescados no Oceano Atlântico, no Nordeste do Pará, próximo a Bragança, Brasil. O valor mais elevado da prevalência da infecção foi observado em A. anableps (42,3% e o menor em C. nobilis (9,1%. A intensidade média da parasitose variou entre 1 parasita em C. nobilis até 19,5 em A. phrygiatus. Efetua-se a descrição da larva, verificando-se que a morfologia da armadura bucal está relacionada com a atividade sugadora de sangue, e faz-se a comparação com as características de outras espécies.

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

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    Márcia Cristina Costa de Azevedo

    1998-12-01

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

  20. Taxonomic Study of Suborder Calcaxonia (Alcyonacea: Octocorallia: Anthozoa from King Sejong Station, Antarctic

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    Jun-Im Song

    2012-04-01

    Full Text Available Some gorgonians in the families, Primnoidae and Isididae within the suborder Calcaxonia were collected from subtidal zones between depths of 10 and 45 m in the coastal regions of King Sejong Station (62??13′S, 058?? 47′W, Korea Polar Research Institute of Korea Ocean Research and Development Institute (KORDI by SCUBA diving from 2009 to 2011. Three species in the Primnoidae, Arntzia gracilis (Molander, 1929, Thouarella (Thouarella antarctica (Valenciennes, 1846 and Onogorgia nodosa (Molander, 1929, and also one species in the family Isididae, Tenuisis microspiculata (Molander, 1929 are newly recorded to octocorallian fauna in Marian Cove and Potter Cove of King George Island. These four species have been described in detail.

  1. Threatened fishes of the world: Clarias dussumieri dussumieri (Valenciennes, 1840) (Clariidae)

    Digital Repository Service at National Institute of Oceanography (India)

    Padmakumar, K.G.; Bindu, L.; Basheer, V.S.; Gopalakrishnan, A.

    in ponds, streams and shallow derelict wetlands. They have biological and physiological adaptations to low oxygen conditions. They are predatory and feed on small fishes, insects and detritus. Reproduction: In nature, the fish has a single spawning season...AssessmentandManagementPlanfor freshwater fishes of India. Zoo Outreach Organization and NationalBureauofFishGeneticResources, Lucknow,156 pp Gopalakrishnan A, Ponniah AG (2000) Cultivable, ornamental, sport and food fishes endemic to Peninsular India with special reference to the Western...

  2. Diets of Halfbeak Hemiramphus lutkei (Valenciennes, 1847 from Karachi Coast, Pakistan

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    Sadaf Tabassum

    2014-02-01

    Full Text Available Objective: To investigate the diets of the Lutke’s halfbeak, Hemiramphus lutkei (H. lutkei to determine the food and feeding habits. Methods: Samples of H. lutkei were collected from the landing sites of Karachi Coast, Pakistan. Total length was measured to the nearest 0.01 cm using digital slide calipers, and total body weight was measured using an electronic balance with 0.01 g accuracy. The dietary composition was determined from gut content examination and analysis was done using frequency of occurrence and numerical methods. To assess the changes in diet with size, H. lutkei were divided into two size groups, Group 1: 14-20 cm (n=250 and Group 2: 21-25 cm (n=160. Results: The total length and body weight of the sampled specimens ranged from 14 to 25 cm and 10 to 23.5 g, respectively. Out of the studied specimens, 45.12% fish stomachs were found to be empty. Dietary composition revealed daphnia, small fish, isopods, unidentified animal materials, ostracods and unidentified plant materials in the gut contents of Lutke’s halfbeak. Therefore, H. lutkei is omnivore fish feeding on algae, zooplankton, small fishes and different food items of both plant and animal origin. According to the Schoener overlap index (C, there was no significant difference in feeding of the two length groups of H. lutkei (C=0.833. On the other hand, the Shannon-Wiener index showed that the prey diversity of the Lutke's halfbeak in Group 1 was lower (H/ =1.545 than that of Group 2 (H/ =1.653. Conclusions: This study reports the first description of diets for H. lutkei, which would be useful for the sustainable management of this fishery in the coast of Pakistan and also neighboring countries.

  3. Ichtyofauna associated with drifting floating objects in the Balearic Islands (Western Mediterranean

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    Francisco Riera

    1999-12-01

    Full Text Available Species composition, size range and some behavioral notes about drifting flotsam associated fish of the Balearic Islands are presented, and more detailed observations on Seriola dumerili, Naucrates ductor, Coryphaena hippurus and Scomberesox saurus are also given. 25 fish species belonging to 18 families were identified, 12 of these species and the individuals of the family Mugilidae were recorded for the first time associated with floating objects in the western Mediterranean. Most of the specimens collected were juveniles, which suggests the importance of floating objects as a nursery, and thus in the recruitment and redistribution of fishes. Analisis of two drift floating material samples show that objects of anthropogenic origin were most abundant (83.5% and 63.5% and suggests that at present, human refuse may have taken over the role of the floating remains of marine plants for fishes in the western Mediterranean pelagic environment.

  4. Diversidade da ictiofauna de poças de maré da praia do Cabo Branco, João Pessoa, Paraíba, Brasil Diversity of the tidal pool ichthyofauna of Cabo Branco beach, João Pessoa, Paraíba, Brazil

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    Ricardo S Rosa

    1997-01-01

    Full Text Available A survey of the tidal pool fish community was carried out between february/1987 and january/1988, at Cabo Branco Beach, João Pessoa, Paraíba, Brazil. Specimens were collected monthly at low tide, using rotenone. A total of 3143 specimens was obtained. The most speciose families were Ophichthidae (14% of the total number of species, Mugilidae (11% and Muraenidae (9%, and the most representative ones in number of individuais were Gobiidae (48%, Pomacentridae (13% and Labrisomidae (10%. The main resident species were Bathygobius soporator (Valenciennes, 1837 and Abudefduf saxalilis (Linnaeus, 1758. The presence of a large number of juveniles in the pools indicated the importance of the studied sites as nursery áreas for several fish species.

  5. Nerocila sp. (Isopoda: Cymothoidae parasitizing Mugil liza (Teleostei: Mugilidae in São Francisco do Sul, Santa Catarina, Brazil

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    Juliano Santos Gueretz

    2018-03-01

    Full Text Available Isopods from the family Cymothoidae are fish ectoparasites displaying low host specificity found commonly attached to the gills, mouth, opercular cavity, nostrils and body surface of several host species. Damage can vary according to the degree of parasitism and the infestation site and may provoke respiratory discomfort in hosts. The aim of this study was to report the occurrence of a Nerocila sp. Leach, 1818 isopod parasitizing Mugil liza Valenciennes, 1836 captured in the Babitonga Bay, Santa Catarina State, Brazil. The female parasite specimen was recovered from the pectoral fin of M. liza and was 24 mm in length and 11 mm in width, and the mean egg size was 1.18 ± 0.08 x 1.03 ± 0.06 mm.

  6. UNE NOUVELLE ESPÈCE DE TOMETES (TELEOSTEI : CHARACIDAE : SERRASALMINAE DU BOUCLIER GUYANAIS, TOMETES LEBAILI N. SP.

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    JÉGU M.

    2002-01-01

    Full Text Available Tometes lebaili n. sp. diffère de Tometes trilobatus Valenciennes, 1850, par la position de la bouche, oblique et dirigée vers le haut. T. lebaili présente 7 à 8 dents à la série labiale du dentaire contre 5 chez T. trilobatus. T. trilobatus, citée des rapides de l’Araguari (Amapá, Brésil à l’Oyapock (Guyane française, est remplacée plus à l’ouest par T. lebaili n. sp., décrite de la Mana (Guyane fr. au Commewine (Surinam et peut-être présente dans le Sinnamary. La taille maximale observée pour T. lebaili est de 512 mm LS.

  7. Plasticity in feeding selectivity and trophic structure of kelp forest associated fishes from northern Chile Plasticidad en la selección de alimento y estructura trófica de los peces asociados a bosques de macroalgas pardas del norte de Chile

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    ALEJANDRO PÉREZ-MATUS

    2012-03-01

    Full Text Available One of the primary ways in which species interact with their environment is through foraging; thereby directly consuming some fraction of their surrounding habitat. The habitat itself, in turn, may dictate the types of foraging opportunities that are available to the inhabitants. To investigate the relationship between habitat availability and diet composition of habitat-associated fishes, we estimated the relative abundance of the potential sessile and mobile prey items and the diet of the fish species assemblage associated to kelp forest. Specifically, diet and feeding selectivity of the kelp-forest associated fish assemblage were determined by calculating Manly's alpha selectivity index. We determined the diet of kelp forest associated fishes and their foraging behavior by comparing prey availability with those items present in the stomachs of fishes captured by gill net and spear gun. We calculated the degree of dietary overlap among fishes from four locations along the northern coast of Chile. Results indicate that utilization of prey by predators is predominantly affected by potential prey availability. With the exception of the two carnivorous species such as Pinguipes chilensis (Valenciennes, 1883 and Paralabrax humeralis (Cuvier & Valenciennes, 1828, whose diet did not change among sites, all other kelp-associated fishes changed their dietary habitats to consistent with the availability of local resources. Benthic resources changed among the different study sites, which led to differing diets even in the same species from different locations. Eleven of the 12 kelp forest fishes also showed some selectively for benthic prey. We conclude that the ability of fishes to be plastic in their feeding preference and, therefore, partition the benthic resources may set adaptations to co-exist in a dynamic environment such as kelp forest.Una de las principales formas en que las especies interactúan con su medio ambiente es a través de la

  8. Brasilochondria riograndensis gen. nov., sp. nov. (Copepoda, Chondracanthidae a parasite of flounders of Rio Grande do Sul State, Brazil

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    Vernon E. Thatcher

    2004-09-01

    Full Text Available Brasilochondria riograndensis gen. nov., sp. nov. (Copepoda, Chondracanthidae a parasite of the flounder, Paralichthys orbignyanus (Valenciennes, 1839, is described. The new genus has a spherical head a post-mandibular "neck" and two pairs of modified biramous legs. In these respects, it resembles Argentinochondria patagonensis Etchegoin, Timi & Sardella, 2003. In the Argentine genus, however, the bulbous head has a medial constriction and the posterior of the female lacks the lateral extensions that are present in the new genus. Pseudolernentoma brasiliensis Luque & Alves, 2003, also resembles the new genus but it lacks the lateral extensions of the trunk and the latter is cylindrical rather than flat. The second leg of the new genus is small and the endopod is shorter than the exopod. The other two genera have large second legs with subequal rami.Brasilochondria riograndensis gen. nov., sp. nov. (Copepoda, Chondracanthidae, um parasito do linguado, Paralichthys orbignyanus (Valenciennes, 1839, é descrito. O novo gênero tem uma cabeça esférica, um "pescoço" pós-mandíbular e dois pares de pernas que são birremes e modificados na fêmea. Nestes aspectos, ela parece com Argentinochondria patagonensis Etchegoin, Timi & Sardella, 2003. Nesta, no entanto, a cabeça é esférica com uma constrição medial e na parte posterior do tronco faltam as extensões póstero-laterais que o novo gênero possui. Pseudolernentoma brasiliensis Luque & Alves, 2003, é também parecido com o novo gênero, mas carece das extensões póstero-laterais e o mesmo tronco é cilíndrico em vez de achatado. A segunda perna no novo gênero é pequena e o endopodito é mais curto que o exopodito. Nos outros dois gêneros, as segundas pernas são grandes e os ramos são sub-iguais.

  9. A new Huffmanela species, H. schouteni sp. n. (Nematoda: Trichosomoididae) from flying fishes in Curaçao.

    Science.gov (United States)

    Moravec, F; Campbell, B G

    1991-01-01

    A new nematode species, Huffmanela schouteni sp. n., has been established on the basis of its egg morphology and biological characters (adult nematodes are unknown). The dark-shelled eggs of this histozoic parasite occur in masses in the abdominal cavity, serose covers of internal organs and in the liver of the flying fishes Hirundichthys affinis Günther (type host) and Cypselurus cyanopterus Cuvier et Valenciennes in Curaçao. The eggs of H. schouteni sp. n. differ from those in other congeneric species mainly in the absence of small spines on the surface of the transparent envelope enclosing the egg proper, measurements (size of eggs 0.069-0.075 x 0.027-0.030 mm) and their localization in the host. A key to Huffmanela species based on egg morphology has been provided.

  10. Sex differences on the feeding of the gobiid fish Bathygobius soporator in tide pools of Maiandeua Island, Pará, Brazil

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    Bruno E. Soares

    2016-01-01

    Full Text Available Abstract Bathygobius soporator (Valenciennes, 1837 is one of the most common fishes in tide pools in the estuary of Pará state, and has an omnivorous feeding habit. This study examined the diet of the species in Maiandeua Island, and aimed to: (i describe the diet of B. soporator through indexes based on the occurrence and weight of consumed items; and (ii evaluate if there is variation in diet composition between males and females. Frequency of Occurrence, frequency of weight and Alimentary Index were calculated for each item, and differences in the diet composition of males and females were observed through multivariate analyses (ANOSIM, NMDS and SIMPER. Bathygobius soporator presented carnivorous feeding habit, eating mainly crustaceans, and differences among males and females were observed, males consuming smaller amounts of crustaceans and including algae in their diet.

  11. New Mediterranean Biodiversity Records (March 2016

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    P. K. KARACHLE

    2016-03-01

    Full Text Available In this Collective Article on “New Mediterranean Biodiversity Records”, we present additional records of species found in the Mediterranean Sea. These records refer to eight different countries throughout the northern part of the basin, and include 28 species, belonging to five phyla. The findings per country include the following species: Spain: Callinectes sapidus and Chelidonura fulvipunctata; Monaco: Aplysia dactylomela; Italy: Charybdis (Charybdis feriata, Carcharodon carcharias, Seriola fasciata, and Siganus rivulatus; Malta: Pomacanthus asfur; Croatia: Lagocephalus sceleratus and Pomadasys incisus; Montenegro: Lagocephalus sceleratus; Greece: Amathia (Zoobotryon verticillata, Atys cf. macandrewii, Cerithium scabridum, Chama pacifica, Dendostrea cf. folium, Ergalatax junionae, Septifer cumingii, Syphonota geographica, Syrnola fasciata, Oxyurichthys petersi, Scarus ghobban, Scorpaena maderensis, Solea aegyptiaca and Upeneus pori; Turkey: Lobotes surinamensis, Ruvettus pretiosus and Ophiocten abyssicolum. In the current article, the presence of Taractes rubescens (Jordan & Evermann, 1887 is recorded for the first time in the Mediterranean from Italy. The great contribution of citizen scientists in monitoring biodiversity records is reflected herein, as 10% of the authors are citizen scientists, and contributed 37.5% of the new findings.

  12. Metabolic effects of exercise in the golden fish Salminus maxillosus "dourado" (Valenciennes, 1849

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    G. Moraes

    Full Text Available Strenuous exercise in fish is usually a consequence of migration, reproduction, and spawning. Varying among fishes, this kind of stress is associated with blood glucose and lactate increase, in relation to which two major groups are distinguishable: the "lactate releasers" and "non-lactate releasers". Unlike strenuous exercise, sustained swimming imposes a variety of effort that results in distinct kinetic types of blood lactate and glucose. Compared to Platichthys stellatus and Oncorhynchus mikyiss, blood lactate of Salminus maxillosus (dourado was lower after exercise, whereas recovery time was greater. Great demands were made of white muscle, and dourado is not a lactate releaser. Two different metabolic tendencies were observed in sustained and intense swimming. Gluconeogenesis was observed during recovery, as well as the alanine cycle which recomposes the lactate tissue pattern. Full recovery after intensive exertion required more than 24 hours.

  13. ANALYSIS OF GROWTH OF LALAWAK Barbonymus balleroides (VALENCIENNES, 1842 IN THREE CULTURE METHODS

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    Deni Radona

    2017-09-01

    Full Text Available In fish culture, optimal growth could be influenced by various culture methods. Aim of the study was to evaluate the productivity of Barbonymus balleroides, lalawak in floating net cages, concrete ponds, and earthen ponds. Cultivation was designed with the circulation water system. Experiment was conducted using completely randomized design with three treatments and three replications for each treatment. The experimental fish, sized of 4.20 ± 0.64 cm SL and weight of 2.14 ± 0.99 g, were obtained from induced breeding. The stocking density used was 20 individuals/m3. Fish were fed 3% of total weight two times every day using commercial pellet with 35% protein content for 90 day. The result showed that lalawak reared in earthen pond was no significant difference on length, weight, and biomass compared with that one in concrete pond (P>0.05, but significantly different (P0.05 among the three different culture systems for survival rate and FCR. Lalawak reared on earthen pond system supported with optimal water quality could increase productivity value.

  14. Acclimation of juvenile Mugil liza Valenciennes, 1836 (Mugiliformes: Mugilidae to different environmental salinities

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    Viviana Lisboa

    Full Text Available Survival and physiological parameters associated with metabolism and osmoregulation were evaluated in juveniles of the Lebranche mullet Mugil liza acclimated to different water salinities (5, 10, 20, 30, and 40‰ for 15 days. Room temperature (25ºC and photoperiod (12L:12D were fixed. Fish were fed twice-a-day with commercial diet (28% crude protein until satiation. After acclimation, whole body oxygen consumption was measured and fish were euthanized and sampled for blood, gills, and liver. Whole body oxygen consumption and plasma osmolality did not change in the range of salinities tested. The isosmotic point was estimated as 412.7 mOsmol kg-1 (13.5‰. Gill Na+,K+-ATPase activity tended to be lower at 20 and 30‰, while liver glycogen content was significantly higher at 20‰ than at 5 and 40‰. These results indicate that juvenile M. liza is able to acclimate for a short-period of time (15 days to a wide range of salinities (5-40‰. This condition is achieved through adjustments in gill Na+,K+-ATPase activity and carbohydrate metabolism to regulate plasma osmolality and aerobic/energy metabolism. Therefore, our findings support the idea of catching juveniles M. liza in sea water and rear them in estuarine and marine waters.

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

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    KAREN FLORES

    2009-03-01

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

  16. Composição em tamanho dos peixes (Actinopterygii, Teleostei de ribeirões da bacia do rio Tibagi, Paraná, Brasil

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    Shibatta Oscar A.

    2003-01-01

    Full Text Available The standard length of 7610 specimens of 43 species from eight streams of rio Tibagi basin was obtained in order to analyze the means of fish sizes. The higher mean size was observed in Gymnotus carapo Linnaeus, 1758 (165,5 mm and the smaller, in Phalloceros caudimaculatus (Hensel, 1868 (16,25 mm. Some fish like Acestrorhynchus lacustris (Reinhardt, 1874, Leporinus obtusidens (Valenciennes, 1836, Gymnotus carapo Linneus, 1758 and Synbranchus marmoratus Bloch, 1795 can reach big or medium size when adults but were collected only young, evidencing they use some streams in beginning of life. The mean size of total species was 49,81mm, what shows the small size composition of fishes in the streams. The Kolmogov-Smirnov test comparing the mean size of all streams showed significant similar size both in upstream and downstream regions, independent to the different environmental conditions.

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

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    Torres Patricio

    1998-01-01

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

  18. Development of a serology-based assay for efficacy evaluation of a lactococcicosis vaccine in Seriola fish.

    Science.gov (United States)

    Nakajima, Nao; Kawanishi, Michiko; Imamura, Saiki; Hirano, Fumiya; Uchiyama, Mariko; Yamamoto, Kinya; Nagai, Hidetaka; Futami, Kunihiko; Katagiri, Takayuki; Maita, Masashi; Kijima, Mayumi

    2014-05-01

    Lactococcicosis is an infection caused by the bacterium Lactococcus garvieae and creates serious economic damage to cultured marine and fresh water fish industries. The use of the assay currently applied to evaluate the potency of the lactococcicosis vaccine is contingent upon meeting specific parameters after statistical analysis of the percent survival of the vaccinated yellowtail or greater amberjack fish after challenge with a virulent strain of L. garvieae. We found that measuring the serological response with a quantitative agglutinating antibody against the L. garvieae antigen (phenotype KG+) was an effective method of monitoring the potency of lactococcicosis vaccines. Vaccinated fish had significantly higher antibody titers than control fish when the L. garvieae Lg2-S strain was used as an antigen. Furthermore, the titer of the KG + agglutinating antibody was correlated with vaccine potency, and the cut-off titer was determined by comparing the data with those from the challenge test. An advantage of the proposed serology-based potency assay is that it will contribute to reduced numbers of animal deaths during vaccine potency evaluations. Copyright © 2014 Elsevier Ltd. All rights reserved.

  19. El estatus taxonómico de Doydixodon laevifrons (Tschudi, 1846 (Osteichthyes: Kyphosidae

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    Germán Pequeño

    2013-03-01

    Full Text Available Doydixodon laevifrons es un pez comúnmente conocido como baúnco, y en los últimos tiempos también ha sido citado como Girella laevifrons en recientes publicaciones sin explicaciones que avalen tal cambio genérico. El objetivo del presente trabajo es revisar las características morfológicas diagnósticas de los géneros Doydixodon Valenciennes, 1846 y Girella Gray, 1835, y su presencia o ausencia en ejemplares de Doydixodon laevifrons procedentes de Chile central. Concluimos que Doydixodon laevifrons es un sinónimo menor (=junior de Girella laevifrons y se distribuye por la franja litoral, desde la costa sur de Perú, hasta aproximadamente El Tabo (33º27’S, 71º41’W en Chile. Es la especie de distribución más austral en su género. Se sugiere revisar la taxonomía del género Girella Gray, 1835, en el Pacífico sur oriental.

  20. International Workshop on Service Orientation in Holonic and Multi-Agent Manufacturing

    CERN Document Server

    Trentesaux, Damien; Thomas, André; McFarlane, Duncan

    2016-01-01

    This volume gathers the peer reviewed papers which were presented at the 5th edition of the International Workshop “Service Orientation in Holonic and Multi-agent Man-ufacturing – SOHOMA’15” organized in November 5-6, 2015 by the Institute for Manufacturing (IfM) of the University of Cambridge, UK in collaboration with the CIMR Research Centre in Computer Integrated Manufacturing and Robotics of the University Politehnica of Bucharest, Romania, the LAMIH Laboratory of Industrial and Human Automation Control, Mechanical Engineering and Computer Science of the University of Valenciennes and Hainaut-Cambrésis, France and the CRAN Re-search Centre for Automatic Control, Nancy of the University of Lorraine, France. The book is structured in seven parts, each one grouping a number of chapters de-scribing research in actual domains of the digital transformation in manufacturing and trends in future manufacturing control: (1) Applications of Intelligent Products; (2) Advances in Control of Physical Internet ...

  1. Myxobolus saladensis sp. nov., a new species of gill parasite of Mugil liza (Osteichthyes, Mugilidae from Samborombón Bay, Buenos Aires, Argentina

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    Paula Marcotegui

    2017-10-01

    Full Text Available ABSTRACT Myxosporean Myxobolus saladensis sp. nov. in the gills of Mugil liza Valenciennes, 1836 from Samborombón Bay was described by light and electron microscopy studies. Spores were pyriform and binucleated, measuring 10.63±0.36 µm (n=20 long, 9.24±0.50 µm (n=20 wide and 4.13±0.36 µm (n=20 thick, included in polysporic cyst-like plasmodia. Elongated pyriform polar capsules were of equal size (3.84±0.27 µm long and 2.30±0.12 µm wide. The sporoplasm contained some sporoplasmosomes. Each PC contained a polar filament with 4-5 coils obliquely arranged in relation to the polar capsules axis. The PC wall was composed of two layers of different electron densities. Based on the morphological and ultrastructure differences of the spore to those of previously described species of Myxobolus, we describe a new species, Myxobolus saladensis sp. nov.

  2. The Mugil curema species complex (Pisces, Mugilidae): a new karyotype for the Pacific white mullet mitochondrial lineage.

    Science.gov (United States)

    Nirchio, Mauro; Oliveira, Claudio; Siccha-Ramirez, Zoila R; de Sene, Viviani F; Sola, Luciana; Milana, Valentina; Rossi, Anna Rita

    2017-01-01

    Recent molecular phylogenetic analyses have shown that the Mugil curema Valenciennes, 1836 species complex includes M. incilis Hancock, 1830, M. thoburni (Jordan & Starks, 1896) and at least four " M. curema " mitochondrial lineages, considered as cryptic species. The cytogenetic data on some representatives of the species complex have shown a high cytogenetic diversity. This research reports the results of cytogenetic and molecular analyses of white mullet collected in Ecuador. The analyzed specimens were molecularly assigned to the Mugil sp. O, the putative cryptic species present in the Pacific Ocean and showed a 2n = 46 karyotype, which is composed of 2 metacentric and 44 subtelocentric/acrocentric chromosomes. This karyotype is different from the one described for M. incilis (2n = 48) and from those of the two western Atlantic lineages Mugil curema (2n = 28), and Mugil margaritae (2n = 24). Data suggest the need for a morphological analysis to assign a species name to this Pacific lineage.

  3. The Mugil curema species complex (Pisces, Mugilidae: a new karyotype for the Pacific white mullet mitochondrial lineage

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    Mauro Nirchio

    2017-04-01

    Full Text Available Recent molecular phylogenetic analyses have shown that the Mugil curema Valenciennes, 1836 species complex includes M. incilis Hancock, 1830, M. thoburni (Jordan & Starks, 1896 and at least four “M. curema” mitochondrial lineages, considered as cryptic species. The cytogenetic data on some representatives of the species complex have shown a high cytogenetic diversity. This research reports the results of cytogenetic and molecular analyses of white mullet collected in Ecuador. The analyzed specimens were molecularly assigned to the Mugil sp. O, the putative cryptic species present in the Pacific Ocean and showed a 2n = 46 karyotype, which is composed of 2 metacentric and 44 subtelocentric/acrocentric chromosomes. This karyotype is different from the one described for M. incilis (2n = 48 and from those of the two western Atlantic lineages Mugil curema (2n = 28, and Mugil margaritae (2n = 24. Data suggest the need for a morphological analysis to assign a species name to this Pacific lineage.

  4. The sagittal otolith morphology of four selected mugilid species from Iranian waters of the Persian Gulf (Teleostei: Mugilidae

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    Vahideh Salehi

    2016-09-01

    Full Text Available The members of mugilid species are usually difficult to recognize because of the well-known similarity observed in their external morphology. Nevertheless, their identification is very important for local fisheries management and conservation action. Therefore, in the present study we applied otolith morphology to evaluate its significance in identification of four selected mugilid species; Chelon subviridis (Valenciennes, 1836, Liza klunzingeri (Day, 1888, Ellochelon vaigiensis (Quoy & Gaimard, 1825 and Mugil cephalus Linnaeus, 1758 occurring in the Iranian waters of the Persian Gulf in southern Iran. The results indicated several otolith features to be important for identification of the selected mugilid species as follow; the position and sulcus centrality, the curvature of the cauda, and the type of anterior and posterior regions. Based on the total approach evidences, we conclude that otolith morphology in mugilid fishes can be evidently used for the species identification and probably estimation of their phylogeny. The findings are in agreement with the previous studies which documented taxonomic importance of otolith morphology.

  5. Service orientation in holonic and multi-agent manufacturing

    CERN Document Server

    Thomas, André; Trentesaux, Damien

    2015-01-01

    This volume gathers the peer reviewed papers presented at the 4th edition of the International Workshop “Service Orientation in Holonic and Multi-agent Manufacturing – SOHOMA’14” organized and hosted on November 5-6, 2014 by the University of Lorraine, France in collaboration with the CIMR Research Centre of the University Politehnica of Bucharest and the TEMPO Laboratory of the University of Valenciennes and Hainaut-Cambrésis.   The book is structured in six parts, each one covering a specific research line which represents a trend in future manufacturing: (1) Holonic and Agent-based Industrial Automation Systems; (2) Service-oriented Management and Control of Manufacturing Systems; (3) Distributed Modelling for Safety and Security in Industrial Systems; (4) Complexity, Big Data and Virtualization in Computing-oriented Manufacturing; (5) Adaptive, Bio-inspired and Self-organizing Multi-Agent Systems for Manufacturing, and (6) Physical Internet Simulation, Modelling and Control.   There is a clear ...

  6. Studies on the eggs and larvae, of Sardinella aurita (Cuv. & Val.) in the fishing grounds of Southern Fujian and the Taiwan Bank

    Science.gov (United States)

    Jiang, Sufei; Lin, Liyu

    1986-03-01

    In this paper, the morphological characters of eggs and larvae of Sardinella aurita (Cuvier & Valenciennes), its spawning ground, spawning seasons and spawning conditions have been studied. Sardinella aurita likes to breed in the upwelling area and selects the Waixie fishing ground as its main spawning ground. The months from February to September are its spawning seasons, reaching its peak in April. In the main spawning ground, the temperature of the surface layer was found to be 24.4 25.2°C, the salinity 33.87 34.07%. and the depth of water between 34 60m. The distribution of the larvae is closely related to the distribution of plankton, the path of migration of adult fish, and the current direction of the water system. In order to protect fishery resources, it is necessary to prohibit catching the spawning fish in the Waixie fishing ground in April, and the catching of immatures from March to June.

  7. Radioactive contamination of the significant fish species in fish-ponds and in natural waters with particular respect to the accumulation of Sr-90 Pt. 2

    International Nuclear Information System (INIS)

    Kantor, D.; Szentjobi, O.

    1977-01-01

    The radioactive contamination of omnivorous fish species (Cyprinus carpio, Hypophtalmictys nobilis Richardson), of herbivorous fish species (Hypophtalmictys molitrix Valenciennes) and carnivorous fish species (Silurus glanis L., Esox Lucius L.) has been investigated. Orientative data have been obtained by analyzing samples originating from various sites. Though differences appeared between the analyzed samples, no incorporations of outstanding nature have been observed. In accordance with experiences described in literature, the isotope Sr-90 is accumulated in an increased degree in the skeleton of fish living in ponds. This is valid in all cases when the vital processes are regulated artificially by fishery methods. A particularly important factor is that the individual fish living in ponds are 2-3 or at most 4 years of age i.e. from the aspect of their ontogenesis their organism is in a strongly build-up phase. Sr-90 proved to be accumulated in a relatively greater amount in the organisms of herbivorous fish. (P.J.)

  8. Morphological and genetic features of cisco (coregonidae: coregonus sp. from lake Sobachye (Putorana plateau

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    Elena A. Borovikova

    2016-09-01

    Full Text Available Background. Recently was revealed that cisco from Lake Sobachye (Putorana Plateau is more similar to Coregonus albula Linnaeuas than C. sardinella Valenciennes according to number of vertebrae [13]. The aim of this work was to investigate molecular genetic features of this population.  Materials and methods. For morphological analysis were used 60 specimens of cisco from Lake Sobachye. For nine specimens molecular genetic analysis was performed. The sequences of two fragments of the mitochondrial DNA (ND1 and COI were defined.  Results. The cisco of the Lake Sobachye significantly differed from riverine cisco of this region by meristic features (namely from cisco of the River Pyasina. Sequencing results showed the minimal divergence of the ND1 and COI sequences of the cisco from Lake Sobachye and vendace.  Conclusion. Morphological analysis and analysis of the mitochondrial DNA polymorphism of cisco from Lake Sobachye revealed close relationship of this population to C. albula.

  9. Microsatellite markers to determine population genetic structure in the golden anchovy, Coilia dussumieri.

    Science.gov (United States)

    Kathirvelpandian, A; Gopalakrishnan, A; Lakra, W S; Krishna, Gopal; Sharma, Rupam; Musammilu, K K; Basheer, V S; Jena, J K

    2014-06-01

    Coilia dussumieri (Valenciennes, 1848) commonly called as golden anchovy, constitutes a considerable fishery in the northern part of both the west and east coasts of India. Despite its clear-cut geographic isolation, the species is treated as a unit stock for fishery management purposes. We evaluated 32 microsatellite primer pairs from three closely related species (resource species) belonging to the family Engraulidae through cross-species amplification in C. dussumieri. Successful cross-priming was obtained with 10 loci, which were sequenced for confirmation of repeats. Loci were tested for delineating the genetic stock structure of four populations of C. dussumieri from both the coasts of India. The number of alleles per locus ranged from 8 to 18, with a mean of 12.3. Results of pairwise F ST indicated genetic stock structuring between the east and west coast populations of India and also validated the utilization of identified microsatellite markers in population genetic structure analysis.

  10. Seasonal implications on toxicity biomarkers of Loricariichthys anus (Valenciennes, 1835) from a subtropical reservoir.

    Science.gov (United States)

    do Amaral, Aline Monique Blank; de Lima Costa Gomes, Jeane; Weimer, Gustavo Henrique; Marins, Aline Teixeira; Loro, Vania Lucia; Zanella, Renato

    2018-01-01

    Cropping systems based on intensive land use and continuous application of agricultural chemicals inflict a threat to aquatic organisms since these substances will inevitably be carried in to water bodies where they can accumulate, particularly in lentic sites. Pesticides exposure in aquatic animals can cause changes that can be quantified through biomarkers. Thus, this study aimed to investigate the effects of season on oxidative stress and neurotoxicity biomarkers in Loricariichthys anus from a subtropical reservoir surrounded by agricultural areas in southern Brazil. Ten armored catfish were collected from six sites in February and August 2016. Pesticides present in the water, sediment and muscle were identified and quantified. No pesticides were detected either in sediment nor in muscle. During the winter, the water contained atrazine, imidacloprid, simazine, azoxystrobin, and propoxur; however, in summer, only atrazine was present in the water. In the winter, there was an increase in the hepatic GST activity and in GPx that kept lipid peroxidation (TBARS) constant and, in the summer, there was an increase in metallothioneins levels. In the gills, variables related to summer were possibly responsible for the elevation of GST, GPx and TBARS; during the winter, there was greater carbonylation of proteins. In the winter, the increased AChE activity in brain and muscle tissue was related to carbonylation of proteins in brain. Although the amount of pesticides detected in the water was low, chronic exposure in addition to environmental variations can cause direct and indirect effects on L. anus population. Copyright © 2017 Elsevier Ltd. All rights reserved.

  11. New approaches for growth improvement in pejerrey Odontesthes bonariensis (Valenciennes, 1835 culture (Atherinomorpha: Atherinopsidae

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    Patricio J. Solimano

    Full Text Available The pejerrey is the most important recreational species in shallow temperate lakes and reservoirs of Argentina and the attempts to develop its culture have started a century ago. A common constraint of pejerrey aquaculture is its poor growth under traditional intensive rearing techniques. The aim of this study was to evaluate the possibility to achieve and maintain high growth rates of pejerrey throughout the rearing process by semi-intensive culture method . Four floating cages were installed in La Salada de Monasterio Lake and each one was stocked with 300 juveniles (10.22 ±0.38cm; 6.52 ±0.82g. From January through March all fish were exposed to natural zooplankton as food source, whereas from April to September two cages were supplied daily with artificial food. The fish exposed to artificial supplementary diets exhibited significantly higher growth (17.5 ±0.98cm; 41.05 ±8.55g than those in the control cages (15.02 ±0cm ; 23.5 ±0.84g, and exceeded the known values in pejerrey culture. The results suggest that the species potential growth is not fully achieved by common intensive methods and it can be improved by semi-intensive techniques. Accordingly a better understanding of the species nutritional requirements is needed to improve growth rates and enhance pejerrey culture.

  12. Genetic evidence of population structuring in the neotropical freshwater fish Brycon hilarii (Valenciennes, 1850

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    A Sanches

    Full Text Available Brycon hilarii is a migratory fish widely distributed throughout the Paraguay River Basin. It is appreciated in sport fishing and for its superior meat quality. It is also the main species for tourist attraction in the Bonito region (State of Mato Grosso do Sul, Brazil. Considering the lack of information on the genetic structure of the fish of this species, the aim of the present study was to detect the genetic variability of Brycon hilarii through RAPD markers. A total of eighty specimens collected in different seasons at four sites of the Miranda River sub-basin (Paraguay River Basin, Brazil were used for analysis. The results of genetic similarity, Shannon diversity, and AMOVA revealed differences between the sampling sites. Through AMOVA, differences between populations were more evident among the animals collected during the non-reproductive season, corresponding to a time of less movement of these fish. A population structuring model in which B. hilarii appears organized into genetically differentiated reproductive units that coexist and co-migrate through the studied system was suggested, contrasting the currently accepted idea that freshwater migratory fish form large panmictic populations in a determined hydrographic system. Despite the lack of a complete picture regarding the distribution of B. hilarii in the studied region, this initial idea on its population genetic structure could be an important contribution to providing aid for management and conservation programs of these fish.

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

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    Iracema David Gomes

    2004-03-01

    Full Text Available Marine catfish are abundant in the Sepetiba Bay, a 305 km 2 area in Southeast Brazilian coast (Lat. 22º 54’-23º 04’S; Long. 43 o 44’-44 o 10’W, but the knowledge on their biology is still scanty. The reproductive biology of Sciadeichthys luniscutis (Valenciennes 1840 and Genidens genidens (Valenciennes 1839 was studied through monthly sampling, from October 1998 to September 1999. Fishes were caught with a standardized otter trawl, in the interior of Sepetiba Bay, and near to the confluence with a major freshwater contributor. Six gonadal stages were described, based on macroscopic observations of gonad form, size, weight, color and oocyte diameter, and microscopic observations of differences in size and staining in the nucleus and cytoplasm structures, as viewed through a light microscope. Changes in the gonadosomatic index (GSI and in stages of gonadal development showed what S. luniscutis spawned in Spring, while G. genidens spawned in Summer. Total spawning was shown for both species as indicated by high concentration of post-ovulatory follicles in spent stages. Fecundity was low (14-38 vitellogenic oocytes for S. luniscutis and 6-24 for G. genidens, when compared with other teleosts. Low fecundity and separation in spawning period suggest that both species are k-strategist, able to avoid interspecific competition in early stages of life cycle to optimize the use of the available nicheEl pez-gato de mar es abundante el la Bahía Sepetiba, un área de 305 km² en la costa del sureste brasileño, pero el conocimiento de su biología es aun escaso. La biología reproductiva de Sciadeichthys luniscutis y Genidens genidens fue estudiada a través de muestreos mensuales, desde octubre de 1998 a setiembre de 1999. Los peces fueron capturados con una red barredera estandarizada, en el interior de la Bahía Sepetiba, y cerca de la confluencia con un río tributario principal. Seis estadíos gonadales fueron descritos, basados en

  14. Preference, tolerance and resistance responses of Poecilia sphenops Valenciennes, 1846 (Pisces: Poeciliidae to thermal fluctuations Respuesta de preferencia, tolerancia y resistencia de Poecilia sphenops Valenciennes, 1846 (Pisces: Poeciliidae a fluctuaciones térmicas

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    Mónica Hernández-Rodríguez

    2010-01-01

    Full Text Available Poecilia sphenops was acclimated to two thermal fluctuations, each following a symmetrical and asymmetrical cycle. The critical maximum temperatures of the fish were significantly different (P Poecilia sphenops fue aclimatada a dos fluctuaciones térmicas cada una con un ciclo simétrico y asimétrico. La temperatura crítica maxima de los peces fue significativamente diferente (P < 0.001 entre las fluctuaciones y se observó a 40°C en el ciclo 20-29°C; para el ciclo 25-35°C fue mayor a 42°C. Los peces aclimatados a la fluctuación 20-29°C fueron más resistentes al frío con una temperatura crítica mínima de 10°C, en contraste a los 11.7°C del régimen 26-35°C. En ambos ciclos la temperatura letal incipiente superior tuvo un intervalo de 38.8 a 39.5°C y la temperatura letal incipiente inferior fue de 10.8 a 11.8°C. La temperatura preferida de las hembras fue de 30 a 31°C, con excepción del ciclo simétrico 26-35°C. La temperatura preferida de los machos aclimatados al ciclo simétrico fue de 23.8 a 24.2°C y de 27.4 a 29.4°C en el ciclo asimétrico. Las temperaturas de evitación de los machos y las hembras aclimatados a la fluctuación 20-29°C tienen un intervalo de 14 a 16°C comparado con el intervalo de 8.4 all .4°C del tratamiento 26-35°C. Los resultados indican que P. sphenops está perfectamente adaptado a las marcadas estaciones de lluvia y sequía de su habitat.

  15. Determination of toxins involved in ciguatera fish poisoning in the Pacific by LC/MS.

    Science.gov (United States)

    Yogi, Kentaro; Sakugawa, Satsuki; Oshiro, Naomasa; Ikehara, Tsuyoshi; Sugiyama, Kiminori; Yasumoto, Takeshi

    2014-01-01

    Ciguatera fish poisoning is the most extensive and difficult to control of the seafood poisonings. To facilitate monitoring of fish toxicity, toxin profiles were investigated by an LC/MS/MS method using 14 reference toxins on eight representative species of fish collected in four different areas of the Pacific. Snappers and groupers from Okinawa contained ciguatoxin-1B (CTX1B) and two deoxy congeners at variable but species-specific ratios, while red snapper, Lutjanus bohar, from Minamitorishima, and amberjack, Seriola dumerili, from Hawaii, contained both CTX1B-type and CTX3C-type toxins. Spotted knifejaw, Oplegnathus punctatus, from Okinawan waters, contained mainly CTX4A and CTX4B, but the same species caught at Miyazaki was contaminated primarily with the CTX3C-type toxins. Otherwise, the toxin profiles were consistently species-specific in fish collected from various locations around Okinawa over 20 years. The LC/MS/MS and mouse bioassay results agreed well, indicating the LC/MS/MS method is a promising alternative to the mouse bioassay. Pure CTX1B and CTX3C were prepared for use in future LC/MS/MS analysis.

  16. Detection of ciguatoxin in fish tissue using sandwich ELISA and neuroblastoma cell bioassay.

    Science.gov (United States)

    Empey Campora, Cara; Dierking, Jan; Tamaru, Clyde S; Hokama, Yoshitsugi; Vincent, Douglas

    2008-01-01

    The applicability of a new enzyme-linked immunoassay (ELISA) for detecting ciguatoxin (CTX) in fish tissue was evaluated by testing three fish species commonly implicated in ciguatera fish poisoning in Hawaii. A total of 164 individual almaco jack (Seriola rivoliana) and greater amberjack (S. dumerili) and a total of 175 individuals of the blue-spotted grouper (Cephalopholis argus) were caught at various locations in the Hawaiian Islands. Muscle tissue from each individual was assessed for the presence of CTX using two methods: a semi-quantitative ELISA that was recently developed for detecting picogram levels of CTX in fish extract and a neuroblastoma (NB) cell assay commonly used to screen for marine toxins in fish. Results of the tests were highly correlated, with the ELISA indicating the presence of CTX in 9.4% of all fish samples, and the NB assay indicating toxicity in 6.8% of the fish samples. We conclude that the ELISA produces reliable and accurate results that are consistent with those provided by the accepted NB assay and that the ELISA has potential for future applications in screening fish populations for CTX.

  17. Comparative gonadogenesis and hormonal induction of spawning of cultured and wild mediterranean amberjack (Seriola dumerili, Risso 1810

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    V. Kozul

    2001-09-01

    Full Text Available The histological characteristics of wild and cultured Mediterranean amberjack gonads were studied during the first four years of their life cycle. No differences were found in the gonad development of both wild and captive males and females during the first and second year. In the third year, wild females showed more advanced oocyte development than captive females. In the fourth year, vitellogenic oocytes were noted for captive females. Fertilised eggs were obtained after a HCG hormone treatment of four- to nine-year old wild specimens. A smaller quantity of mature and fertilised eggs was also obtained through the spawning of hormone-treated four-year old captive broodstock specimens. Eggs in the stage of gastrulation died within eight hours following fertilisation.

  18. Patterns of oocyte development in natural habitat and captive Salminus hilarii Valenciennes, 1850 (Teleostei: Characidae).

    Science.gov (United States)

    Honji, R M; Narcizo, A M; Borella, M I; Romagosa, E; Moreira, R G

    2009-03-01

    Fecundity and oocyte development in Salminus hilarii female brood stock were analyzed with the aim of investigating the impact of migration impediment on oogenesis. Histological analyses of the ovaries were performed in adult females caught in two different environments--the Tietê River (natural) and captivity--and the gonadossomatic index, oocyte diameter and fecundity determined. Five germ cell development stages (oogonium, perinucleolar, cortical alveoli, vitellogenic, ripe) and two other structures (postovulatory follicles and atretic oocytes) were observed in females caught in the river. Captive animals lacked the ripe oocytes and postovulatory follicles and had a relatively higher number of atretic oocytes. Females in captivity are known to produce larger oocytes, and they release fewer eggs in each spawn (absolute fecundity) when compared with animals that are able to migrate. Our results suggest that the Tietê River is undergoing alterations which are being reflected in the reproductive performance of S. hilarii, mainly due to the presence of atretic oocytes in females caught in the river. The lack of postovulatory follicles and ripe oocytes in captive animals reveals that migratory impediment negatively impacts final oocyte maturation. However, the stage of maturation reached is adequate for ovulation induction with hormone manipulation.

  19. A review of the genus Antorchis Linton, 1911 (Trematoda: Faustulidae) from Indo-Pacific fishes with the description of a new species.

    Science.gov (United States)

    Cribb, Thomas H; Bray, Rodney A; Hall, Kathryn A; Cutmore, Scott C

    2015-09-01

    Species of the faustulid genus Antorchis Linton, 1911 of the tropical Indo-West Pacific are reviewed. We recognise five species in the region, including a novel form. Antorchis nasonis n. sp. is described from Naso annulatus (Quoy & Gaimard) and N. tonganus (Valenciennes) on the southern Great Barrier Reef (GBR). We interpret specimens reported from Naso hexacanthus (Bleeker) from Japan as the same species. This species appears to be the only faustulid known from acanthurid fishes and differs from all other species in the genus in having the prominent dorsal genital invagination close to the posterior end of the body. In addition, new host and locality records are reported for two described species of Antorchis, A. pomacanthi (Hafeezullah & Siddiqi, 1970) and A. tsushimaensis (Machida, 1971). The wide distribution of A. pomacanthi was further demonstrated by the generation of identical ITS2 rDNA sequences for specimens from Ningaloo Reef off Western Australia, off Lizard and Heron Islands (GBR) and off New Caledonia, localities separated by up to 5,300 km. The host-specificity of the genus is considered.

  20. Biologie de la reproduction du Cyprinidae, Barbus callensis dans le lac de barrage Hamiz (Algérie

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    Ould Rouis, S.

    2012-01-01

    Full Text Available Reproductive Biology of the Cyprinidae, Barbus callensis in an Algerian Dam. The freshwater fish, Barbus callensis (Valenciennes, 1842 was studied from 2005 to 2007 for the first time in Hamiz dam. This species endemic of North African continent is widely spread in the rivers of Algeria. This reservoir is situated in Boumerdes 35 km southeast of Algiers. During these three years, the monthly sampling was carried out by trammel nets, fishing near the dike during one night. At the same time, the fry was captured with a transparent plastic bottle baited with breadcrumbs put down near the lakeshore. The monthly follow-up of the gonadosomatic ratio (RGS reveals that the spawning period occurred between April and May. The evolution of the condition factor (K shows low seasonal variations. However, a lower value appears in spring when the temperature increases and the breeding begins. The sex ratio is higher for the adult females (1:2.8, more than 26 cm. The first sexual maturity size (L50 is lower for males (19.6 cm than for females (27.7 cm.

  1. Morphological and genetic analyses of the first record of the Niger Hind, Cephalopholis nigri (Perciformes: Serranidae, in the Mediterranean Sea and of the African Hind, Cephalopholis taeniops, in Malta

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    Noel Vella

    2016-11-01

    Full Text Available Abstract Background Non-native marine species, including tropical eastern Atlantic fish species are on the increase in Malta, with shipping activities being the main vector for the movement of these alien species from the Atlantic into the Mediterranean Sea. This calls for cooperation and collaboration between various sea-users and researchers to ensure continuous monitoring of coastal biodiversity. Methods Research methods involving local fishermen cooperation in monitoring efforts to identify and track populations of alien species in the Central Mediterranean has led to new records for the genus Cephalopholis (Perciformes: Serranidae in Malta. Morphological characteristics, meristic counts and mitochondrial DNA sequences from specimens of both species sampled from Maltese waters were analysed to confirm their species identify accurately, essential for tracking their respective population expansions in the Mediterranean. Results and conclusion Results from this study have led to confirmation of the first record of the Niger Hind, Cephalopholis nigri (Günther, 1859, in the Mediterranean Sea and of the establishment of the African Hind, Cephalopholis taeniops (Valenciennes, 1828 in Maltese waters.

  2. Total mercury of selected fish species from Laguna de Bay

    International Nuclear Information System (INIS)

    Relon, Milagros Lontoc

    1996-01-01

    Dalag Ophicephalus striatus Block, kanduli Arius thalassinus Ruppell, bia Amblygobius phalaena Cuvier et Valenciennes and tilapia Tilapia nilotica Linnnaeus collected from Laguna de Bay between Taguig and Binangonan area in August 1989 to July 1990 were analyzed for total mercury by atomic absorption spectrometry. The highest metal concentration in soft muscle tissue was observed in Dalag followed by kanduli, less in bia and least in tilapia with mean values of 0.021, 0.020, 0.013, and 0.008 ug/g, respectively. Analysis using two-way ANOVA showed a significant difference in the mean total mercury in ug/g in the difference fish samples, among the different months and the interaction between these two variables. Mean total mercury of the four fish samples were significantly higher in April than in October. The results show that the levels of total mercury in the fish samples are below the World Health Organization maximum tolerable consumption of mercury in food of 300 ug or 0.03 mg of total mercury per week. (author)

  3. Inability to demonstrate fish-to-fish transmission of Ichthyophonus from laboratory infected Pacific herring Clupea pallasii to naïve conspecifics.

    Science.gov (United States)

    Gregg, J L; Grady, C A; Friedman, C S; Hershberger, P K

    2012-06-13

    The parasite Ichthyophonus is enzootic in many marine fish populations of the northern Atlantic and Pacific Oceans. Forage fishes are a likely source of infection for higher trophic level predators; however, the processes that maintain Ichthyophonus in forage fish populations (primarily clupeids) are not well understood. Lack of an identified intermediate host has led to the convenient hypothesis that the parasite can be maintained within populations of schooling fishes by waterborne fish-to-fish transmission. To test this hypothesis we established Ichthyophonus infections in Age-1 and young-of-the-year (YOY) Pacific herring Clupea pallasii (Valenciennes) via intraperitoneal (IP) injection and cohabitated these donors with naïve conspecifics (sentinels) in the laboratory. IP injections established infection in 75 to 84% of donor herring, and this exposure led to clinical disease and mortality in the YOY cohort. However, after cohabitation for 113 d no infections were detected in naïve sentinels. These data do not preclude the possibility of fish-to-fish transmission, but they do suggest that other transmission processes are necessary to maintain Ichthyophonus in wild Pacific herring populations.

  4. Studies on metazoan parasites of two marine fish species of interest for aquaculture: Seriola dumerili and Sparus aurata

    OpenAIRE

    Repullés Albelda, Aigües

    2013-01-01

    0.1. Introducción general La acuicultura ha experimentado un importante aumento durante los últimos 50 años, resultado del incremento global de población y la creciente demanda de proteínas de alta calidad. En los últimos 40 años, la proporción de reservas pesqueras moderadamente explotadas ha descendido progresivamente hasta estabilizarse en el 15% y en la actualidad, la mayoría de los stocks pesqueros están sobreexplotados y (FAO, 2010). Más de la mitad de los productos acuáticos provien...

  5. DNA barcode identification of commercial fish sold in Mexican markets.

    Science.gov (United States)

    Sarmiento-Camacho, Stephanie; Valdez-Moreno, Martha

    2018-04-24

    The substitution of high-value fish species for those of lower value is common practice. Although numerous studies have addressed this issue, few have been conducted in Mexico. In this study, we sought to identify fresh fillets of fish, sharks, and rays using DNA barcodes. We analyzed material from "La Viga" in Mexico City, and other markets located on the Gulf and Caribbean coasts of Mexico. From 134 samples, we obtained sequences from 129, identified to 9 orders, 28 families, 38 genera, and 44 species. The most common species were Seriola dumerili, Pangasianodon hypophthalmus, Carcharhinus falciformis, Carcharhinus brevipinna, and Hypanus americanus. Pangasianodon hypophthalmus was most commonly used as a substitute for higher-value species. The substitution rate was 18% of the total. A review of the conservation status of the specimens identified against the IUNC list enabled us to establish that some species marketed in Mexico are threatened: Makaira nigricans, Lachnolaimus maximus, Hyporthodus flavolimbatus, and Isurus oxyrinchus are classified as vulnerable; Lopholatilus chamaeleonticeps and Sphyrna lewini are endangered; and the status of Hyporthodus nigritus is critical. These results will demonstrate to the Mexican authorities that DNA barcoding is a reliable tool for species identification, even when morphological identification is difficult or impossible.

  6. Antibody profiling using a recombinant protein-based multiplex ELISA array accelerates recombinant vaccine development: Case study on red sea bream iridovirus as a reverse vaccinology model.

    Science.gov (United States)

    Matsuyama, Tomomasa; Sano, Natsumi; Takano, Tomokazu; Sakai, Takamitsu; Yasuike, Motoshige; Fujiwara, Atushi; Kawato, Yasuhiko; Kurita, Jun; Yoshida, Kazunori; Shimada, Yukinori; Nakayasu, Chihaya

    2018-05-03

    Predicting antigens that would be protective is crucial for the development of recombinant vaccine using genome based vaccine development, also known as reverse vaccinology. High-throughput antigen screening is effective for identifying vaccine target genes, particularly for pathogens for which minimal antigenicity data exist. Using red sea bream iridovirus (RSIV) as a research model, we developed enzyme-linked immune sorbent assay (ELISA) based RSIV-derived 72 recombinant antigen array to profile antiviral antibody responses in convalescent Japanese amberjack (Seriola quinqueradiata). Two and three genes for which the products were unrecognized and recognized, respectively, by antibodies in convalescent serum were selected for recombinant vaccine preparation, and the protective effect was examined in infection tests using Japanese amberjack and greater amberjack (S. dumerili). No protection was provided by vaccines prepared from gene products unrecognized by convalescent serum antibodies. By contrast, two vaccines prepared from gene products recognized by serum antibodies induced protective immunity in both fish species. These results indicate that ELISA array screening is effective for identifying antigens that induce protective immune responses. As this method does not require culturing of pathogens, it is also suitable for identifying protective antigens to un-culturable etiologic agents. Copyright © 2018 Elsevier Ltd. All rights reserved.

  7. Feeding ecology of Hypostomus punctatus Valenciennes, 1840 (Osteichthyes, Loricariidae in a costal stream from Southeast Brazil

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    R. Mazzoni

    Full Text Available In the present study we aimed to compare the feeding ecology of Hypostomus punctatus from a coastal stream from Southeast Brazil with data previously published for the same study site before environmental changes. Feeding preferences were assessed through a sample of 138 specimens (67 from the dry and 71 from the rainy season using the Index of Alimentary Importance (IAi. We registered five different food items (detritus, plant fragments, Diatoms, Chloroficeae and Cianobacteries composing the species diet. Detritus was the most abundant one both during the rainy and dry seasons (IAirainny = 90.34 and IAidry = 96.30. No significant differences were registered for the volume of food items consumed during the rainy and dry seasons. The Frequency of Occurrence analysis showed that four (detritus, plant fragments, Diatoms and Chloroficeae among the five all other consumed ones, were always frequent. Comparing our own results with those available for the study site, we suggest that the feeding habit of H. punctatus has changed according to environmental changes and that the species diet is strongly dependent upon environmental conditions.

  8. Fish bycatch of the laulao catfish Brachyplatystoma vaillantii (Valenciennes, 1840 trawl fishery in the Amazon Estuary

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    Erica Antunes Jimenez

    2013-06-01

    Full Text Available This study aimed to analyse the composition and seasonal variation in the fish bycatch of the Brachyplatystoma vaillantii trawl fishery in the Amazon Estuary in 2009 by monitoring the trips of 48 vessels. The bycatch represented 29% of the catches, totalling 22,228 specimens and 52 taxa, distributed in 22 families (the principal families were Ariidae, Pimelodidae, and Sciaenidae. Brachyplatystoma rousseauxii, Plagioscion squamosissimus, and Sciades herzbergii together contributed 69% of the bycatch and were considered consistent bycatch species. Although a higher proportion of bycatch was captured during the rainy season, the seasonal difference was not significant. A multidimensional scaling (MDS ordination analysis and an analysis of similarity (ANOSIM indicated that the species composition of the bycatch was similar across the seasons. However, larger numbers of B. rousseauxii and P. squamosissimus were captured during the rainy season, whereas S. herzbergii predominated during the dry season. The marine migrants and estuarine species guilds showed the greatest richness, whereas freshwater migrants were the most numerous. Among the feeding guilds, the zoobenthivores were the most diverse, whereas the piscivores were the most abundant. The results indicate that fishing pressure primarily affects small- (20-30 cm and medium-sized (30-50 cm individuals, although the catch of P. squamosissimus was composed primarily of adults. However, the catches of both B. rousseauxii and B. vaillantii were composed primarily of juveniles.

  9. THE ECONOMICS OF INDUCED BREEDING OF Heterobranchus longifilis (VALENCIENNES, 1840 USING HORMONAL INDUCTION AND MANUAL STRIPPING

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    Anderson Nwalozie NWACHUKWU

    2014-04-01

    Full Text Available The economics of two induced breeding methods-hormonal induction and manual stripping were evaluated. In a 1:1 male: female ratio. Three (3 trials were made in each method using spawners weighing 1.5kg each. In the hormonal trial, 0.5ml ovaprim was injected into each spawner and both placed in a breeding tank containing aerated water 10 cm deep. Spawning occurred overnight and eggs incubated at 260C. In the stripping method, eggs were obtained from the female by gentle pressure on the abdomen and fertilized with milt from the macerated testes of the male partner, incubated in another tank containing aerated water 10 cm deep at 260C. Hatching occurred 25 hours later in both tanks. Fingerlings raised were harvested on the 30th day with mean counts of 509 and 3,032 in the hormonal and stripping methods, respectively. Statistical analysis using the least significant difference test (LSD showed that there was a significant difference (p<0.05 between the mean effect of the treatments. Economic analysis showed a loss of N9,089.00 and a profit of N64,600.00 with mean cost-returns ratios of 0.30 and 1.6 in the hormonal and stripping methods, respectively. It was therefore recommended that farmers use the stripping method in producing Heterobranchus lonifilis fingerlings. [Read full article] [Citation

  10. Genetic identification of bucktooth parrotfish Sparisoma radians (Valenciennes, 1840 (Labridae, Scarinae by chromosomal and molecular markers

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    Fabilene Gomes Paim

    2014-12-01

    Full Text Available Parrotfishes (Labridae, Scarinae comprise a large marine fish group of difficult identification, particularly during juvenile phase when the typical morphology and coloration of adults are absent. Therefore, the goal of this study was to test cytogenetic markers and DNA barcoding in the identification of bucktooth parrtotfish Sparisoma radians from the northeastern coast of Brazil. Sequencing of cytochrome c oxidase subunit I (COI confirmed all studied samples as S. radians, and all showed high similarity (99-100% with Caribbean populations. The karyotype of this species was divergent from most marine Perciformes, being composed of 2n = 46 chromosomes. These consisted of a large number of metacentric and submetacentric pairs with small amounts of heterochromatin and GC-rich single nucleolar organizer regions (NORs not syntenic to 5S rDNA clusters. These are the first data about DNA barcoding in parrotfish from the Brazilian province and the first refined chromosomal analysis in Scarinae, providing useful data to a reliable genetic identification of S. radians.

  11. Invasão da piranha Serrasalmus marginatus Valenciennes, 1847 no alto rio Paraná, Brasil (Osteichthyes, Serrasalmidae Observation of an invasion of the piranha Serrasalmus marginatus Valenciennes, 1847 (Osteichthyes, Serrasalmidae into the Upper Paraná River, Brazil

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    Horácio Ferreira Júlio Junior

    2002-05-01

    Full Text Available A construção da barragem de Itaipu, 150 km a jusante do salto de Sete Quedas, resultou no afogamento da barreira geográfica natural, com conseqüente mistura das ictiofaunas. Serrasalmus marginatus (Osteichthyes, Serrasalmidae, uma espécie que apresentava distribuição restrita ao segmento a jusante de Sete Quedas, invadiu o alto rio Paraná. A captura de Serrasalmus spilopleura, uma espécie residente, diminuiu drasticamente após a invasão, ao contrário de S. marginatus que aumentou em abundância. No rio Piquiri, onde a espécie invasora não ocorreu, a abundância de S. spilopleura permaneceu alta por causa das quedas de Nhá Bárbara e Apertado.The building of Itaipu Dam, 150 km downstream from Sete Quedas Falls, resulted in the natural geographical barrier drowning, with subsequent mixing of the fish faunas. Serrasalmus marginatus (Osteichthyes, Serrasalmidae, a species that had been restricted to the river segment downstream from Sete Quedas, invaded the Upper Paraná River. The catching of Serrasalmus spilopleura, a resident species, decreased drastically after the invasion, contrary to S. marginatus, which increased in abundance. In the Piquiri River, where the latter species does not occur, the abundance of S. spilopleura remained high, due to the presence of Nhá Bárbara and Apertado Falls.

  12. Taxonomic review of the species of Mugil (Teleostei: Perciformes: Mugilidae) from the Atlantic South Caribbean and South America, with integration of morphological, cytogenetic and molecular data.

    Science.gov (United States)

    Menezes, Naércio A; Nirchio, Mauro; De Oliveira, Cláudio; Siccharamirez, Raquel

    2015-01-10

    Analysis of morphological, molecular and cytological data helped to define and more precisely characterize the species of Mugil from the Atlantic coasts of South Caribbean and South America, allowing a correction of prior misidentifications and distributional ranges. A new species from Venezuela is described and all the species from the area are redescribed. It is demonstrated that the apparent similarity in morphological traits, which contradicted the results from recent molecular studies, is the result of the misuse of traditional morphological characters, and thus both the molecular and cytological data instead are congruent with the morphological differences that are found among mullet species. The presence of Mugil hospes Jordan & Culver in the western south Atlantic is refuted based on the comparison of type material of this species with specimens from this area that also indicated a very significant morphological difference, what on the other hand justifies the recognition of these specimens as Mugil brevirostris (Ribeiro). The distribution of Mugil incilis Hancock is restricted and the similarities among the species formerly depicted in a prior dendrogram is modified following the inclusion of recently obtained molecular data for Mugil curvidens Valenciennes.

  13. Seletividade alimentar de organismos-alimento por formas jovens de pacu Piaractus mesopotamicus (Holmberg, 1887 e curimba Prochilodus lineatus (Valenciennes, 1836 = Selective feeding of food organisms by fish larvae of Piaractus mesopotamicus (Holmberg, 1887 and Prochilodus lineatus (Valenciennes, 1836

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    Nandeyara Ribeiro Marques

    2007-04-01

    Full Text Available Objetivou-se avaliar a seleção alimentar de organismos-alimento por formas jovens de pacu (Piaractus mesopotamicus e curimba (Prochilodus lineatus com diferentes idades (6, 12, 19 e 26 dias, na presença e ausência de Pistia stratiotes. Foram utilizados quatrotratamentos (T1 = pacu + P. stratiotes; T2 = pacu; T3 = curimba + P. stratiotes; T4 = curimba e quatro repetições. A cada sete dias, foram coletadas 24 larvas de cada espécie de peixe dos tanques, sendo estas mantidas em jejum por 24 horas. Depois de distribuídas nos aquários com plâncton, as larvas permaneceram por três horas, sendocoletadas e fixadas para análise, juntamente com as amostras de água. Os tratos digestórios das larvas foram retirados e analisados sob microscópio óptico. Observaram-se diferenças estatísticas na seletividade alimentar de organismos planctônicos por larvas de mesmaespécie, em diferentes idades e também entre larvas de espécies diferentes, com mesma idade, não diferindo quanto à presença ou ausência de P. stratiotes. As formas jovens de pacu e curimba selecionaram organismos similares aos seis dias de idade, passando por alterações até o 26º dia. À medida que se desenvolveram, as larvas de pacu passaram a selecionar cladóceros e ostrácodos e as de curimba, protozoários e algas.Theobjective was to evaluate the feeding selection of food organisms for two species of fish larvae (pacu and curimba at different ages (6, 12, 19 and 26 days after eclosion, in the presence or absence of Pistia stratiotes. Four treatments were used (T1 = pacu + P. stratiotes; T2 = pacu; T3 = curimba + P. stratiotes; T4 = curimba and four replications. Every seven days, 24 fish larvae of each species were collected, and kept without food for 24 hours. Afterbeing distributed in the aquariums with plankton, the larvae stayed for three hours, and were collected and prepared for analysis, along with the water samples. The digestive tract of the fish larvae were removed and analyzed under an optic microscope. Statistic differences in selective feeding of plankton organisms were reported for larvae of the same species, of different age groups and also among larvae of different species of the same age. There were no observed differences as for the presence or absence of P. stratiotes. The fish larvae of pacu and curimba selected similar organisms at six days old, with changes until the 26th day. As they developed, the pacu larvae began to select cladocerans and ostracods, and the curimba selected protozoans and algae.

  14. Glyphosate-based herbicide affects biochemical parameters in Rhamdia quelen (Quoy & Gaimard, 1824 and Leporinus obtusidens (Valenciennes, 1837

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    Vania Lucia Loro

    Full Text Available Rhamdia quelen (silver catfish and Leporinus obtusidens (piava were exposed to a commercial formulation Roundup(r, a glyphosate-based herbicide at concentrations of 0.2 or 0.4 mg/L for 96 h. The effects of the herbicide were analyzed on the alanine aminotransferase (ALT and aspartate aminotransferase (AST activities and glucose in plasma, glucose and protein in the mucus layer, nucleotide hydrolysis in the brain, and protein carbonyl in the liver. The parameters were chosen, owing to a lack of information concerning integrated analysis, considering oxidative damage parameters, liver damage, and effects on the mucus layer composition and triphosphate diphosphohydrolase (NTPDase activities. Plasmatic glucose levels were reduced in both species, whereas the transaminase activities (ALT and AST increased after exposure to the herbicide. Herbicide exposure increased protein and glucose levels in the mucus layer in both species. There was a reduction in both NTPDase and ecto-5'-nucleotidase activity in the brain of piava, and increased enzyme activity in silver catfish at both concentrations tested. The species showed an increase in protein carbonyl in the liver after exposure to both concentrations of the glyphosate. Our results demonstrated that exposure to Roundup(r caused liver damage, as evidenced by increased plasma transaminases and liver protein carbonyl in both of the fish species studied. The mucus composition changed and hypoglycemia was detected after Roundup(r exposure in both species. Brain nucleotide hydrolysis showed a different response for each fish species studied. These parameters indicated some important and potential indicators of glyphosate contamination in aquatic ecosystems.

  15. Production and quality assessment of fish burger from the grass carp, Ctenopharyngodon idella (Cuvier and Valenciennes, 1844

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    Monjurul Haq

    2013-12-01

    Full Text Available Fish burger was produced from grass carp (Ctenophygodon idella to assess the feasibility of value addition to this low priced fish in Bangladesh. Different food additives (25% mashed potato, 2% NaCl, 2% soybean oil, 2% spices and 0.6% sugar were used to enhance the consumer’s acceptance of the fishery product. Consumers' acceptance of the fish burger was determined by sensory evaluation based on its color, flavor, softness or firmness (S/F, chewy/ rubbery (C/R using 10 point scoring system by a group of 10 untrained judges (20-50 years old. The results were found as follows: color (7.25±1.15, flavor (6.67±1.17, S/F (8.47±1.20 and C/R (7.83±1.23. Evaluation of proximate composition showed that the moisture and protein contents in grass carp mince were 79.15 ± 1.16 % and 18.01±0.44 % respectively which were higher than that of fish burger, 69.46 ± 0.89 % and 16.42 ± 0.57 %, respectively. Lipid (6.64±0.15 % and ash (2.98±0.09 % contents in fish burger were also higher than fish mince. The pH of fish mince and fish burger was 6.8±0.11 and 6.6±0.05 respectively. Therefore, from simple cost-profit analysis, it can be assumed that business of fish burger in Bangladesh has a very good prospect and it would be profitable.

  16. Diet composition of the round sardinella Sardinella aurita Valenciennes, 1847 (Osteichthyes: Clupeidae in the Turkish Aegean Sea

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    Bahar Bayhan

    2015-12-01

    Full Text Available Sardinella aurita, a round sardinella from Clupeidae family, is a pelagic fish found in tropical and temperate seas, just like other members of its family. The species has a wide distribution and its contribution to Mediterranean and international fisheries production potential is high. In Turkey, this species has a wide distribution in the Mediterranean Sea and the Aegean Sea, on the other hand, it is rarely seen in the Black Sea and Marmara Sea. Apart from its economic contribution to the world fisheries industry, the species has an important role in the food chain in regions it is found as it takes part in diet composition of its predators such as greater amberjack, and common dolphinfish. Nowadays, trophic levels are used in order to develop ecosystem based fisheries management strategies. For this purpose, diet composition of the round sardinella was investigated. Samples were obtained from commercial fishermen, who generally use purse seine and gill nets in Izmir Bay concerned during October 2010 - September 2011. A total of 434 S. aurita were collected all year round, with total lengths ranging 12.1 to 27.1 cm. Fish were dissected immediately after capture, stomachs removed and stored in formalin (10% until the contents were analysed. Stomach contents examined using a SZX7 Olympus stereo microscope. Prey items were identified to the lowest possible taxon. Forty eight species were identified, belonging to six major groups: Polychaeta, Crustacea, Mollusca, Chaetognatha, Tunicate and Teleostei. Finally crustaceans were the most important food item in terms of index of relative importance. At least 31 copepod species were identified, where Calanoida, Oithona nana, Oncaea media and Oithona plumifera appeared all year round with %IRI ≥ 10. With this study, the feeding regime of round sardinella, was identified in detail for the Aegean Sea of Turkey for the first time.

  17. Pesticides residues in the Prochilodus costatus (Valenciennes, 1850) fish caught in the São Francisco River, Brazil.

    Science.gov (United States)

    Oliveira, Fabiano A; Reis, Lilian P G; Soto-Blanco, Benito; Melo, Marília M

    2015-01-01

    The objective of this study was to determine the levels of pesticides in the fish Prochilodus costatus caught in São Francisco River, one of most important rivers in Brazil. Thirty-six fish were captured in three different areas, and samples of the dorsal muscle and pooled viscera were collected for toxicological analysis. We evaluated the presence of 150 different classes of insecticides, fungicides, herbicides and acaricides by multiresidue analysis technique using liquid chromatography-tandem mass spectrometry (LC-MS/MS), with the limit of detection of 5 ppb. In this study, organophosphorus and carbamate pesticides were detected at the highest levels in the caught fish. Among the 41 organophosphorus pesticides surveyed, nine types were detected (chlorpyrifos, diazinon, dichlorvos, disulfoton, ethion, etrimfos, phosalone, phosmet and pyrazophos) in the muscle, viscera pool, or both in 22 (61.1%) fish. Sampled tissues of 20 (55.6%) fish exhibited at least one of the eight evaluated carbamate pesticides and their metabolites: aldicarb, aldicarb sulfoxide, carbaryl, carbofuran, carbosulfan, furathiocarb, methomyl and propoxur. Fungicides (carbendazim, benalaxyl, kresoxim-methyl, trifloxystrobin, pyraclostrobin and its metabolite BF 500 pyraclostrobin), herbicides (pyridate and fluasifop p-butyl), acaricide (propargite) and pyrethroid (flumethrin) were also detected. In conclusion, P. costatus fish caught in the São Francisco River contained residues of 17 different pesticides, in both muscles and the viscera pool, indicating heavy environmental contamination by pesticides in the study area.

  18. Caracterização da piscicultura na região do Vale do Ribeira - SP Characterization of fish farming in the Ribeira Valley region - SP

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    Daniela Castellani

    2005-02-01

    Full Text Available Este trabalho buscou caracterizar a piscicultura na Região do Vale do Ribeira quanto aos sistemas de manejo. Estudaram-se quarenta e duas pisciculturas sendo que, destas, 36 praticam o sistema semi-intensivo e seis o sistema intensivo, com os seguintes objetivos: engorda de peixes, produção de alevinos e pesque-pagues. Foram listadas 41 espécies de peixes cultivadas. Apenas 6 espécies são nativas da Bacia do Rio Ribeira de Iguape: lambari (Astyanax sp Linneaus, 1758, traíra (Hoplias malabaricus Bloch, 1794, robalo (Centropomus ssp Cuvier e Valenciennes, 1928, jundiá (Rhamdia quelen Quoy e Gaimard, 1824, cascudo (Hypostomus sp Marschall, 1873 e cará (Geophagus brasiliensis Quoy e Gaimard, 1824. Em 95% das pisciculturas foram verificadas fugas de peixes exóticos e alóctones dos cultivos. A tilápia nilótica (Oreochromis niloticus Linneaus, 1758 foi a espécie mais freqüente em escapes, e também é a segunda mais cultivada pelos piscicultores, perdendo somente para o pacu (Piaractus mesopotamicus Halmberg, 1887. Foi possível verificar mediante o cálculo da conversão alimentar, que há um desperdício anual de cerca de 32% da ração utilizada nos cultivos pesquisados. A piscicultura encontra-se em plena expansão nesta região, e já representa a atividade agropecuária mais importante após a bananicultura.The aim of this work was to characterize the fish farming in the Ribeira de Iguape Basin, southern São Paulo State (Brazil, in relation to the management systems. Forty two farms were studied. A semi-intensive system is used by 36 farmers, while an intensive system is used only by 6 studied farmers. Their objectives were raising fish, juvenile fish production and sportive fishery. Forty one fish species were found to be cultivated, but only six were native species from Ribeira Valley: lambari (Astyanax sp Linneaus, 1758, traíra (Hoplias malabaricus Bloch, 1794, robalo (Centropomus ssp Cuvier and Valenciennes, 1928, jundi

  19. A new species of Algansea (Actinopterygii: Cyprinidae from the Ameca River basin, in Central Mexico Una especie nueva de Algansea (Actinopterygii: Cyprinidae en la cuenca del río Ameca en el centro de México

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    Rodolfo Pérez-Rodríguez

    2009-08-01

    Full Text Available A morphological comparative analysis was performed among different populations of the cyprinid Algansea tincella Valenciennes, 1844 from the Lerma-Chapala and Ameca River basins in central Mexico. A new species, Algansea amecae n. sp. is described from individuals collected from small tributary in the headwaters of the Ameca basin. The new species differs from Lerma-Chapala populations of A. tincella by having a lower number of transversal scales, a lower number of infraorbital pores, a prominent dark lateral stripe along the body, a black caudal spot extending onto the medial caudal inter-radial membranes, and a pigmented ("dotted" lateral line. This new species increases the high level of endemism in the freshwater ichthyofauna of the Ameca basin. It appears to be most closely related to populations in the Lerma-Chapala-Santiago system, as is the case for several other species in the Ameca basin. This pattern of relationship provides evidence for a historical connection between the 2 basins, and implies that a vicariance event led to the isolation of populations and a subsequent speciation event. Due to the limited distributional range of Algansea amecae n. sp., and the environmental deterioration of the Ameca River, we propose that this new species should be designated as a protected species under Mexican law.Se realizó un análisis morfológico comparando diferentes poblaciones del ciprínido Algansea tincella Valenciennes, 1844 correspondientes a los sistemas hidrológicos Lerma-Chapala y cuenca del río Ameca. Con base en este análisis se describe una nueva especie, Algansea amecae n. sp. a partir de los individuos recolectados en un pequeño afluente del alto Ameca, en el centro de México. La nueva especie difiere de las poblaciones de A. tincella del sistema Lerma-Chapala-Santiago por presentar un menor número de escamas transversales, un menor número de poros infraorbitales, una franja obscura lateral muy marcada a lo largo del

  20. TAXONOMY AND GENETIC RELATIONSHIPS OF PANGASIIDAE, ASIAN CATFISHES, BASED ON MORPHOLOGICAL AND MOLECULAR ANALYSES

    Directory of Open Access Journals (Sweden)

    Rudhy Gustiano

    2007-12-01

    Full Text Available Pangasiids are economically important riverine catfishes generally residing in freshwater from the Indian subcontinent to the Indonesian Archipelago. The systematics of this family are still poorly known. Consequently, lack of such basic information impedes the understanding of the biology of the Pangasiids and the study of their aquaculture potential as well as improvement of seed production and growth performance. The objectives of the present study are to clarify phylogeny of this family based on a biometric analysis and molecular evidence using 12S ribosomal mtDNA on the total of 1070 specimens. The study revealed that 28 species are recognised as valid in Pangasiidae. Four genera are also recognized as Helicophagus Bleeker 1858, Pangasianodon Chevey 1930, Pteropangasius Fowler 1937, and Pangasius Valenciennes 1840 instead of two as reported by previous workers. The phylogenetic analysis demonstrated the recognised genera, and genetic relationships among taxa. Overall, trees from the different analyses show similar topologies and confirm the hypothesis derived from geological history, palaeontology, and similar models in other taxa of fishes from the same area. The oldest genus may already have existed when the Asian mainland was still connected to the islands in the southern part about 20 million years ago.

  1. Age-based and reproductive biology of the Pacific Longnose Parrotfish Hipposcarus longiceps from Guam

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    Brett M. Taylor

    2017-11-01

    Full Text Available The Pacific longnose parrotfish Hipposcarus longiceps (Valenciennes 1840 represents a prime fishery resource throughout much of the tropical Pacific. In this study, we sampled the species from the Guam commercial fishery market across five consecutive years to characterize reproductive and age-based demographic information imperative for informed fishery management. Compared with other parrotfishes, this species was found to be large-bodied, but has only a moderate life span of 10 + years. Hipposcarus longiceps was confirmed as a diandric protogynous hermaphrodite with highly sex-specific growth patterns and an overall mean asymptotic length of 434 mm fork length (FL. Females were estimated to reach median maturity at 329 mm FL (2.4 years and have a median length at female-to-male sex change of 401 mm FL. Life-history trait values derived here were used to update previous models relating life history and vulnerability to overexploitation. We found that enhancement of just one species’ trait values improved model fits considerably, which strengthens the conclusion that life-history traits are a strong determinant of species’ vulnerability in the parrotfishes. This information is an imperative complement to other data sources facilitating formal stock assessment of a key fishery target.

  2. The parasite Ichthyophonus sp. in Pacific herring from the coastal NE Pacific.

    Science.gov (United States)

    Hershberger, P K; Gregg, J L; Hart, L M; Moffitt, S; Brenner, R; Stick, K; Coonradt, E; Otis, E O; Vollenweider, J J; Garver, K A; Lovy, J; Meyers, T R

    2016-04-01

    The protistan parasite Ichthyophonus occurred in populations of Pacific herring Clupea pallasii Valenciennes throughout coastal areas of the NE Pacific, ranging from Puget Sound, WA north to the Gulf of Alaska, AK. Infection prevalence in local Pacific herring stocks varied seasonally and annually, and a general pattern of increasing prevalence with host size and/or age persisted throughout the NE Pacific. An exception to this zoographic pattern occurred among a group of juvenile, age 1+ year Pacific herring from Cordova Harbor, AK in June 2010, which demonstrated an unusually high infection prevalence of 35%. Reasons for this anomaly were hypothesized to involve anthropogenic influences that resulted in locally elevated infection pressures. Interannual declines in infection prevalence from some populations (e.g. Lower Cook Inlet, AK; from 20-32% in 2007 to 0-3% during 2009-13) or from the largest size cohorts of other populations (e.g. Sitka Sound, AK; from 62.5% in 2007 to 19.6% in 2013) were likely a reflection of selective mortality among the infected cohorts. All available information for Ichthyophonus in the NE Pacific, including broad geographic range, low host specificity and presence in archived Pacific herring tissue samples dating to the 1980s, indicate a long-standing host-pathogen relationship. © 2015 John Wiley & Sons Ltd.

  3. A description on pharyngeal jaw apparatus and diets of halfbeak fish Zenarchopterus buffonis (Valenciennes 1847) in Malaysian waters

    Science.gov (United States)

    Abidin, Diana Atiqah Zainal; Hashim, Marina; Das, Simon K.; Ghaffar, Mazlan Abd.

    2015-09-01

    Information on the feeding mechanism and diet of halfbeak fish species in harsh estuarine environment ecosystem is still lacking. The present study investigates the fine structure of pharyngeal jaw apparatus and diets of halfbeak fish Zenarchopterus buffonis. A total of 84 halfbeak fish samples have been collected from the coastal water of Peninsular Malaysia using fishing rod. Scanning electron microscopy was used to examine the micrographs of fine microstructure of the pharyngeal teeth. The fundamental anatomy of pharyngeal jaw apparatus displayed that the upper pharyngeal jaw (third pharyngobranchials) displays larger size of hook-like or tricuspid teeth which was analogous to tricuspid morphology. The lower pharyngeal jaw (fifth ceratobranchial) bears mainly conical teeth and appears triangular shape with two, short projections. The estimated TROPH values (1 - 3.2±0.55) denoted that halfbeak fish were omnivores in nature. The findings of this study was found to be useful as a baseline information for a better representation of the trophic flows associated with large medium and small surface water fishes.

  4. A description on pharyngeal jaw apparatus and diets of halfbeak fish Zenarchopterus buffonis (Valenciennes 1847) in Malaysian waters

    International Nuclear Information System (INIS)

    Abidin, Diana Atiqah Zainal; Hashim, Marina; Ghaffar, Mazlan Abd.; Das, Simon K.

    2015-01-01

    Information on the feeding mechanism and diet of halfbeak fish species in harsh estuarine environment ecosystem is still lacking. The present study investigates the fine structure of pharyngeal jaw apparatus and diets of halfbeak fish Zenarchopterus buffonis. A total of 84 halfbeak fish samples have been collected from the coastal water of Peninsular Malaysia using fishing rod. Scanning electron microscopy was used to examine the micrographs of fine microstructure of the pharyngeal teeth. The fundamental anatomy of pharyngeal jaw apparatus displayed that the upper pharyngeal jaw (third pharyngobranchials) displays larger size of hook-like or tricuspid teeth which was analogous to tricuspid morphology. The lower pharyngeal jaw (fifth ceratobranchial) bears mainly conical teeth and appears triangular shape with two, short projections. The estimated TROPH values (1 − 3.2±0.55) denoted that halfbeak fish were omnivores in nature. The findings of this study was found to be useful as a baseline information for a better representation of the trophic flows associated with large medium and small surface water fishes

  5. Detection of Saprolegnia parasitica in eggs of angelfish Pterophyllum scalare (Cuvier–Valenciennes with a history of decreased hatchability

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    Alaa Eldin Eissa

    2013-06-01

    Full Text Available Mass mortalities of angelfish eggs accompanied with very low hatchability were reported in a private ornamental fish farm in Egypt. Examined eggs were badly damaged by water mould that was decisively confirmed as Saprolegnia species. Presumptive identification of the ten retrieved isolates was initially suggestive of Saprolegnia species. Mycological investigations have revealed that only 7 out of 10 isolates were capable of producing sexual stages. Therefore, using molecular tools such as PCR coupled with partial sequencing of inter-transcribed spacer (ITS gene was one of the most important approaches to distinguish Saprolegnia parasitica from other water moulds. The sequences of ITS gene data derived from eight isolates showed 100% similarity with S. parasitica ATCC90312 sequence and the remaining two isolates were different in one nucleotide (99.9%. The phylogenetic analysis of ITS genes grouped the ten isolates with other S. parasitica in one clad. Further, to control such fungal infection, the efficacy of povidone iodine as surface disinfectant for angelfish and their fertilized eggs were tested. By trial, it was obvious that the obtained post-rinsing results were highly suggestive for the efficacy of povidone iodine as an efficient antifungal disinfectant for both fish and eggs.

  6. Karyotype supporting Mugil curema Valenciennes, 1836 and Mugil gaimardianus Desmarest, 1831 (Mugilidae: Teleostei as two valid nominal species

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    Mauro Nirchio

    2003-03-01

    Full Text Available In this study, we present the karyotypic features of two taxa, curema and gaimardianus (genus Mugil, supposed to be synonyms by some authors. Their cytogenetic differences are conspicuous and unambiguous, providing evidence that Mugil curema and Mugil gaimardanus are two valid nominal species.

  7. A description on pharyngeal jaw apparatus and diets of halfbeak fish Zenarchopterus buffonis (Valenciennes 1847) in Malaysian waters

    Energy Technology Data Exchange (ETDEWEB)

    Abidin, Diana Atiqah Zainal, E-mail: diana.atiqah@gmail.com; Hashim, Marina; Ghaffar, Mazlan Abd., E-mail: magfish05@yahoo.com [School of Environmental and Natural Resource Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor (Malaysia); Das, Simon K. [Marine Ecosystem Research Centre, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi (Malaysia)

    2015-09-25

    Information on the feeding mechanism and diet of halfbeak fish species in harsh estuarine environment ecosystem is still lacking. The present study investigates the fine structure of pharyngeal jaw apparatus and diets of halfbeak fish Zenarchopterus buffonis. A total of 84 halfbeak fish samples have been collected from the coastal water of Peninsular Malaysia using fishing rod. Scanning electron microscopy was used to examine the micrographs of fine microstructure of the pharyngeal teeth. The fundamental anatomy of pharyngeal jaw apparatus displayed that the upper pharyngeal jaw (third pharyngobranchials) displays larger size of hook-like or tricuspid teeth which was analogous to tricuspid morphology. The lower pharyngeal jaw (fifth ceratobranchial) bears mainly conical teeth and appears triangular shape with two, short projections. The estimated TROPH values (1 − 3.2±0.55) denoted that halfbeak fish were omnivores in nature. The findings of this study was found to be useful as a baseline information for a better representation of the trophic flows associated with large medium and small surface water fishes.

  8. Massive consumption of gelatinous plankton by Mediterranean apex predators.

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    Luis Cardona

    Full Text Available Stable isotopes of carbon and nitrogen were used to test the hypothesis that stomach content analysis has systematically overlooked the consumption of gelatinous zooplankton by pelagic mesopredators and apex predators. The results strongly supported a major role of gelatinous plankton in the diet of bluefin tuna (Thunnus thynnus, little tunny (Euthynnus alletteratus, spearfish (Tetrapturus belone and swordfish (Xiphias gladius. Loggerhead sea turtles (Caretta caretta in the oceanic stage and ocean sunfish (Mola mola also primarily relied on gelatinous zooplankton. In contrast, stable isotope ratios ruled out any relevant consumption of gelatinous plankton by bluefish (Pomatomus saltatrix, blue shark (Prionace glauca, leerfish (Lichia amia, bonito (Sarda sarda, striped dolphin (Stenella caerueloalba and loggerhead sea turtles (Caretta caretta in the neritic stage, all of which primarily relied on fish and squid. Fin whales (Balaenoptera physalus were confirmed as crustacean consumers. The ratios of stable isotopes in albacore (Thunnus alalunga, amberjack (Seriola dumerili, blue butterfish (Stromaeus fiatola, bullet tuna (Auxis rochei, dolphinfish (Coryphaena hyppurus, horse mackerel (Trachurus trachurus, mackerel (Scomber scombrus and pompano (Trachinotus ovatus were consistent with mixed diets revealed by stomach content analysis, including nekton and crustaceans, but the consumption of gelatinous plankton could not be ruled out completely. In conclusion, the jellyvorous guild in the Mediterranean integrates two specialists (ocean sunfish and loggerhead sea turtles in the oceanic stage and several opportunists (bluefin tuna, little tunny, spearfish, swordfish and, perhaps, blue butterfish, most of them with shrinking populations due to overfishing.

  9. Towards the development of a sustainable soya bean-based feedstock for aquaculture.

    Science.gov (United States)

    Park, Hyunwoo; Weier, Steven; Razvi, Fareha; Peña, Pamela A; Sims, Neil A; Lowell, Jennica; Hungate, Cory; Kissinger, Karma; Key, Gavin; Fraser, Paul; Napier, Johnathan A; Cahoon, Edgar B; Clemente, Tom E

    2017-02-01

    Soya bean (Glycine max (L.) Merr.) is sought after for both its oil and protein components. Genetic approaches to add value to either component are ongoing efforts in soya bean breeding and molecular biology programmes. The former is the primary vegetable oil consumed in the world. Hence, its primary usage is in direct human consumption. As a means to increase its utility in feed applications, thereby expanding the market of soya bean coproducts, we investigated the simultaneous displacement of marine ingredients in aquafeeds with soya bean-based protein and a high Omega-3 fatty acid soya bean oil, enriched with alpha-linolenic and stearidonic acids, in both steelhead trout (Oncorhynchus mykiss) and Kampachi (Seriola rivoliana). Communicated herein are aquafeed formulations with major reduction in marine ingredients that translates to more total Omega-3 fatty acids in harvested flesh. Building off of these findings, subsequent efforts were directed towards a genetic strategy that would translate to a prototype design of an optimal identity-preserved soya bean-based feedstock for aquaculture, whereby a multigene stack approach for the targeted synthesis of two value-added output traits, eicosapentaenoic acid and the ketocarotenoid, astaxanthin, were introduced into the crop. To this end, the systematic introduction of seven transgenic cassettes into soya bean, and the molecular and phenotypic evaluation of the derived novel events are described. © 2016 The Authors. Plant Biotechnology Journal published by Society for Experimental Biology and The Association of Applied Biologists and John Wiley & Sons Ltd.

  10. Development and evaluation of a real-time fluorogenic loop-mediated isothermal amplification assay integrated on a microfluidic disc chip (on-chip LAMP) for rapid and simultaneous detection of ten pathogenic bacteria in aquatic animals.

    Science.gov (United States)

    Zhou, Qian-Jin; Wang, Lei; Chen, Jiong; Wang, Rui-Na; Shi, Yu-Hong; Li, Chang-Hong; Zhang, De-Min; Yan, Xiao-Jun; Zhang, Yan-Jun

    2014-09-01

    Rapid, low-cost, and user-friendly strategies are urgently needed for early disease diagnosis and timely treatment, particularly for on-site screening of pathogens in aquaculture. In this study, we successfully developed a real-time fluorogenic loop-mediated isothermal amplification assay integrated on a microfluidic disc chip (on-chip LAMP), which was capable of simultaneously detecting 10 pathogenic bacteria in aquatic animals, i.e., Nocardia seriolae, Pseudomonas putida, Streptococcus iniae, Vibrio alginolyticus, Vibrio anguillarum, Vibrio fluvialis, Vibrio harveyi, Vibrio parahaemolyticus, Vibrio rotiferianus, and Vibrio vulnificus. The assay provided a nearly-automated approach, with only a single pipetting step per chip for sample dispensing. This technique could achieve limits of detection (LOD) ranging from 0.40 to 6.42pg per 1.414μL reaction in less than 30 min. The robust reproducibility was demonstrated by a little variation among duplications for each bacterium with the coefficient of variation (CV) for time to positive (Tp) value less than 0.10. The clinical sensitivity and specificity of this on-chip LAMP assay in detecting field samples were 96.2% and 93.8% by comparison with conventional microbiological methods. Compared with other well-known techniques, on-chip LAMP assay provides low sample and reagent consumption, ease-of-use, accelerated analysis, multiple bacteria and on-site detection, and high reproducibility, indicating that such a technique would be applicable for on-site detection and routine monitoring of multiple pathogens in aquaculture. Copyright © 2014 Elsevier B.V. All rights reserved.

  11. Studies on rare earth elements in seawater and uptake by marine organisms

    International Nuclear Information System (INIS)

    Suzuki, H.; Koyanagi, T.; Saiki, M.

    1975-01-01

    The contents of rare earth elements in marine environmental samples were determined by neutron activation analysis to examine the existing state in coastal seawater and the concentration by marine organisms of the elements. Seawater was filtered through a Millipore filter GS (pore size 0.22 μm), before the analysis. Some of the seawater was treated with HC1 solution before filtration and some after filtration. Certain marine organisms were also analysed for determination of rare earth elements. These were: flounder (Paralichthys olivaceus); yellowtails (Seriola quinqueradiata); immature anchovy (Engraulis japonica); clams (Meretrix lusoria); green algae (Ulva pertusa); brown algae (Hizikia fusiforme, Sargassum fulvellum, Undaria pinnatifida). In the seawater without HC1 treatment before filtration, considerable amounts of the elements existed in residue on the filter, whereas in the seawater treated with HC1 before filtration, the greater part remained in the dissolved state. Concentration factors calculated from the contents of stable elements, therefore, are affected remarkably by the existing state of the elements in seawater. If only the dissolved state is assumed available for marine organisms, values one order higher are attained compared with the case where total amounts of the elements were used for the calculation. However, the contribution of the insoluble state seems to be not negligible with some organisms. The higher concentration factors for immature anchovy and clams observed in this study were considered to be caused by surface adsorption of elements in particulate form and also ingested sediment with high element concentration. (author)

  12. Genetic characteristics of Streptococcus dysgalactiae isolated from cage cultured cobia, Rachycentron canadum (L.).

    Science.gov (United States)

    Tsai, M-A; Wang, P-C; Yoshida, T; Chen, S-C

    2015-12-01

    Disease outbreaks occurred during 2007-2013 in Taiwan with 2.5-10% mortality among the cage cultured cobia, Rachycentron canadum (L.), characterized by the presence of polyserositis, pericarditis and peritonitis. The micro-organisms isolated from internal organs were Gram-positive cocci. The isolates were confirmed as Streptococcus dysgalactiae by a polymerase chain reaction assay that yielded the expected specific 259 bp amplicon. Additionally, partial sequence of the 16S-23S rDNA intergenic spacer region of the GCS strain isolates from fish was also compared and produced 100% sequence identity with S. dysgalactiae (GenBank accession number AB252398). The genetic characterization was then determined by pulsed-field gel electrophoresis (PFGE) analysis. Based on PFGE, the Apa I or Sma I digestion patterns of chromosomal DNA of these isolates were grouped into three main clusters. Taiwanese strains were divided into two clusters, and the tet(M) gene was detected in cluster 1 (pulsotypes: A1-A2 and S1-S3), but not in cluster 2 strains (pulsotypes: A3-A4 and S4-S5). Three Japanese strains from amberjack, Seriola dumerili (Risso), were grouped into cluster 3 (pulsotypes: A5-A7 and S6-S8) and displayed no mortality to cobia in the challenge experiment. Conversely, Taiwanese strains from cobia and snubnose pompano, Trachinotus blochii (L.), displayed a mortality rate of 50-87.5% in cobia. © 2014 John Wiley & Sons Ltd.

  13. Atividade de amilase em quimo de três espécies tropicais de peixes teleostei de água doce Amylase activity in the chyme of three teleostei freshwater fish

    Directory of Open Access Journals (Sweden)

    José Teixeira de Seixas Filho

    1999-01-01

    Full Text Available O objetivo deste trabalho foi determinar a atividade de amilase no quimo presente nos intestinos médio e posterior, ou reto, em três espécies tropicais de peixes Teleostei de água doce: piracanjuba, Brycon orbignyanus (Valenciennes, 1849, piau, Leporinus friderici (Bloch, 1794, onívoros, e surubim, Pseudoplatystoma coruscans (Agassiz, 1829, preferencialmente carnívoro, visando fornecer referência à nutrição para o ajuste da alimentação artificial. As atividades de amilase foram determinadas usando-se kit BIOCLIN com metodologia modificada por CARAWAY (1959. Os resultados monstraram atividade específica média (2106,33 UA/mg para amilase do piracanjuba e foram 91,74% menor em comparação ao piau (25.488,14 UA/mg, ambos de hábito alimentar onívoro, enquanto a atividade específica da amilase para o piracanjuba foi 89,06% menor em relação ao surubim (19.246,80 UA/mg, carnívoro, o qual apresentou atividade específica da amilase 24,49% menor em relação à do piau. Os dados sugerem que a grande diferença da atividade específica de amilase entre o piau e o piracanjuba possui ligação com sua morfometria e o complexo arranjo das pregas da mucosa dos intestinos médio e posterior. Além disso, a atividade de amilase do surubim indica possibilidade de uso de ração contendo carboidratos, porém estudos adicionais são necessários para a avaliação do comportamento dessas espécies na alimentação artificial.The objective of this work was to determine the amylase activity in the chyme present in the medium and posterior intestines or in the rectum of three tropical freshwater Teleostei species: piracanjuba, Brycon orbignyanus (Valenciennes, 1849, piau, Leporinus friderici (Bloch, 1974, omnivorous, and surubim, Pseudoplatystoma coruscans (Agassiz, 1829, preferably carnivorous, aiming to provide nutritional reference data for the adjustment of the artificial feeding systems. The amylase activity was determined by the use of

  14. PERSPECTIVAS DE SUSTENTABILIDADE ECOLÓGICA DO TURISMO EM XINGÓ, SE/AL / TOURISM ECOLOGICAL SUSTAINABILITY PERSPECTIVES IN XINGÓ, SERGIPE AND ALAGOAS, BRAZIL

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    Cláudio Roberto Braghini

    2009-06-01

    Full Text Available RESUMO A busca da sustentabilidade em várias dimensões implica olhar para o desenvolvimento local nos territórios em que o turismo ocorre. Este estudo analisou de forma sistêmica a relação entre turismo, gastronomia local e os recursos extraídos do rio São Francisco pela pesca artesanal, na região de Xingó, Nordeste do Brasil. A área de estudo abrangeu três municípios, Poço Redondo/SE, Canindé de São Francisco/SE e Piranhas/AL. Tratou-se de uma pesquisa exploratória, descritiva, intencional e não probabilística, utilizando entrevistas com roteiro estruturado e aberto, junto aos restaurantes, pescadores artesanais e gestores públicos, visitas locais de reconhecimento, construção de mapa coletivo com pescadores e elaboração de diagramas de alças causais, visando selecionar indicadores de sustentabilidade. Os resultados indicaram o Surubim Pseudoplatystoma corruscans (Spix e Agassiz, 1829, Pitu Macrobrachium carcinus (Linnaeus, 1758 e Tubarana Salminus hilarii (Valenciennes, 1850, os pescados típicos mais vendidos, no entanto, dependem de distribuidores e de estoques externos. Observou-se que a redução do pescado na região deveu-se à barragem da UHE de Xingó e a sobrepesca. O fluxo turístico crescente tem forte influência sobre o camarão Pitu. Os indicadores ambientais selecionados apontam necessidade de sistematização de informações sobre a produção pesqueira e o consumo nos restaurantes.Palavras-chaves: Sustentabilidade; Turismo; Xingó; Rio São Francisco; CaatingaABSTRACTThe carrying support and the development of the local tourism involve different looks on its dimensions in the area where it occurs. This study examined in a systematic way the sustainability of tourism in the Northeast - Brazil, region of Xingó: the resources tourist and local gastronomy. The study area covers three districts: Poço Redondo and Canindé do São Francisco at Sergipe and in the state of Alagoas at Piranhas. This research

  15. Alimentación de Chirostoma humboldtianum (Valenciennes; (Pisces: atherinopsidae en el estanque JC en Soyaniquilpan, Estado de México

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    G. Elías Fernández

    2008-01-01

    Full Text Available Los charales son peces endémicos del centro de México que han sido consumidos desde épocas prehispánicas, en la actualidad, el volumen de su captura ha disminuido por diversos motivos como la sobrepesca y la contaminación del hábitat, por lo cual es muy importante estudiar las poblaciones que quedan para conocer sus requerimientos ecológicos y alimenticios y poder plantear alternativas para su conservación. Por lo anterior, los objetivos de este trabajo fueron: determinar los grupos alimenticios que consume Chirostoma humboldtianum en el estanque JC en Soyaniquilpan, Estado de México y la variación de algunos parámetros físicos y químicos del agua. Se realizaron seis muestreos mensuales de diciembre de 2001 a mayo de 2002. Se registró la temperatura, la profundidad, la transparencia, la conductividad, la turbiedad, el pH, el oxígeno disuelto, la dureza y la alcalinidad. Los peces se capturaron con un chinchorro de 25 metros de longitud y 8 mm de abertura y fueron fijados con formalina al 10 %. El contenido alimenticio fue identificado con claves especializadas. Para determinar el porcentaje de los grupos alimenticios se utilizó el método volumétrico y de frecuencias. Se encontró que el agua es templada, turbia, con regular cantidad de oxígeno disuelto, de dureza moderada. Chirostoma humboldtianum consumió 21 tipos de organismos, destacando Keratella, Trichocerca, Asplanchna, Bosmina, además de copépodos, coríxidos y quironómidos. El método de frecuencias mostró a Cyclops y Keratella como el alimento preferencial.

  16. Biología y Conservación de Aphanius iberus (Valenciennes, 1846) en la Región de Murcia

    OpenAIRE

    Oliva Paterna, Francisco José

    2006-01-01

    Aphanius iberus es un Ciprinodóntido endémico de la Península Iberica que está catalogado como especie En Peligro de Extinción en diversos listados nacionales e internacionales. Sus poblaciones presentes en la Región de Murcia se encuentran entre las más importantes para la conservación de la especie en el sureste peninsular.La escasez y ausencia de conocimientos sobre la biología de especies amenazadas es un importante factor que incrementa su riesgo de extinción. El presente trabajo evalua...

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

    Directory of Open Access Journals (Sweden)

    Thiago Augusto Pedroso Barbosa

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

  18. Diel and seasonal movements of grumatã Prochilodus lineatus (Valenciennes 1836 (Characiformes: Prochilodontidae in the Sinos River, Southern Brazil

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    NA. Pesoa

    Full Text Available Prochilodus lineatus is a reophilic migratory species of economical importance for local fisheries which is widely distributed in Brazil. The present study investigated diel and seasonal movement patterns, spawning migration and habitat use of P. lineatus in the Sinos River, Southern Brazil. Between August 2002 and March 2004, 19 grumatãs were tagged internally with digitally coded radio transmitters. Tracking was conducted weekly by boat or aircraft, and six fixed data loggers recorded movements of tagged fish. Results showed that the mean distance covered per fish and day was positively related with fish weight (p = 0.03; n = 19. Grumatã showed preference for river streches surrounded by wetlands (p < 0.001; n = 286. Their diel activity pattern displayed one peak at 7 hours, and a second at 15 hours. During the night, activity was significantly reduced (p = 0.01. The seasonal movements pattern showed increased activity in October 2002 - March 2003 and from October 2003 to January 2004. Multiple regression analysis did not show a significant relationship between distance covered and temperature or water level (p = 0.116; n = 19. No synchronized long distance spawning migrations were observed. The mean distance covered by the individuals/day showed a negative significant relationship with number of tracking days (p = 0.022; n = 19, indicating a higher probability of being captured for more mobile individuals. The preservation of the still existing wetlands and reduction of the fishing pressure are essential for the future conservation of the grumatã population of the Sinos River.

  19. Potencial atrator de tubarões costeiros em recife artificial no litoral norte do estado do Rio de Janeiro, Brasil Attractive potential of coastal sharks in artificial reef on the Northern Coast of Rio de Janeiro State, Brazil

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    Vicente Vieira Faria

    2001-09-01

    Full Text Available Artificial reefs have been used in many countries to increase coastal fishery productivity. In order to increase fish attraction to the Northern Coast of Rio de Janeiro State, it was installed an artificial reef (1,500 m² 5 nautical miles off Manguinhos's Bay (São Francisco de ltabapoana, Rio de Janeiro. The artificial structures were made of tires, concrete and cement blocks. A gill net of 125 x 3 m was monthly used in the artificial reef (AR and in a control area (CA to determine the effect of the experimental structures on the stock and diversity of coastal sharks. Considering the complexity of a sustainable elasmobranch exploitation, sharks were focused in this study. During 24 months of investigation (April/96 to March/98, a total of 325 individuais distributed in four shark species were captured in the two areas (AR and CA: Mustelus higmani (Springer & Lowe, 1963 (AR = 70; CA = 82 individuals, Rhizoprionodon lalandii (Valenciennes, 1839 (AR = 86; CA = 56 individuals, R. porosus (Poey, 1861 (AR = 16; CA = 14 individuals and Carcharhinus brachyurus (Günther, 1870 (AR = 1 individual. The attractive potential of the artificial reef is suggested by the predominance of the shark R. lalandii in the reef complex after the first year of monitoring, with the increase of the structures.

  20. Larvae of migratory fish (Teleostei: Ostariophysi in the lotic remnant of the Paraná River in Brazil

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    Evelyn Barzotto

    2015-08-01

    Full Text Available ABSTRACT Fish larvae and adults are morphologically distinct from each other and have different ecological requirements. Research on the dynamics of ichthyoplankton provides valuable information about the early stages of the life cycle of fish. This study analyzed the temporal and spatial distribution of the larval stages of three migratory species - Salminus brasiliensis (Cuvier, 1816, Prochilodus lineatus (Valenciennes, 1836 and Pseudoplatystoma corruscans (Agassiz, 1829 - to identify possible spawning areas in the last lotic remnant of the upper Paraná River, in the Brazilian territory. A total of 26 points were sampled monthly from October 2003 to November 2004. The PERMANOVA detected significant differences between the months only for S. brasiliensis (Pseudo-F = 3.88, p = 0.0021 and P. corruscans (Pseudo-F = 3.35, p = 0.004. Among the environmental variables, temperature was the most important and the Mantel test detected a significant correlation between temperature and the densities, only for P. lineatus (r = 0.09, p = 0.03. The species in our data chose for spawning tributaries that are not dammed, of which most are outside conservation areas. Therefore, recruitment, maintenance and possible actions aiming to recover the stocks of these species are dependent on the conservation of tributaries and floodplain lakes in the region, in addition to monitoring to prevent fishing during the reproductive period.

  1. The parasite Ichthyophonus sp. in Pacific herring from the coastal NE Pacific

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    Hershberger, Paul K.; Gregg, Jacob L.; Hart, Lucas M.; Moffitt, Steve; Brenner, Richard L.; Stick, K.; Coonradt, Eric; Otis, E. O.; Vollenweider, Johanna J.; Garver, Kyle A.; Lovy, Jan; Meyers, T.R.

    2016-01-01

    The protistan parasite Ichthyophonus occurred in populations of Pacific herring Clupea pallasii Valenciennes throughout coastal areas of the NE Pacific, ranging from Puget Sound, WA north to the Gulf of Alaska, AK. Infection prevalence in local Pacific herring stocks varied seasonally and annually, and a general pattern of increasing prevalence with host size and/or age persisted throughout the NE Pacific. An exception to this zoographic pattern occurred among a group of juvenile, age 1+ year Pacific herring from Cordova Harbor, AK in June 2010, which demonstrated an unusually high infection prevalence of 35%. Reasons for this anomaly were hypothesized to involve anthropogenic influences that resulted in locally elevated infection pressures. Interannual declines in infection prevalence from some populations (e.g. Lower Cook Inlet, AK; from 20–32% in 2007 to 0–3% during 2009–13) or from the largest size cohorts of other populations (e.g. Sitka Sound, AK; from 62.5% in 2007 to 19.6% in 2013) were likely a reflection of selective mortality among the infected cohorts. All available information for Ichthyophonus in the NE Pacific, including broad geographic range, low host specificity and presence in archived Pacific herring tissue samples dating to the 1980s, indicate a long-standing host–pathogen relationship.

  2. La pisciculture continentale dans la région du Gontougo (Côte d'Ivoire: Caractérisation et aspects socio-économiques

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    N'dri, KM.

    2016-01-01

    Full Text Available Continental Fish Farming in the Gontougo Area (Ivory Coast: Characterization and Socio-economic Aspects. This study aims at identifying the current state of fish farming in the area of Gontougo. It was carried out from May to September 2013 using a questionnaire and individual interview with fish farmers. The results showed that all producers practiced artisanal fish farming and this activity played an important socio-economic role. Fish farming is exclusively carried out by local people belonging mainly to the Abron ethnic group (77.8%. This activity is mainly practiced by people aged 45 years and over (77.8%. It was observed that 41.7% of the ponds are in derivation while 58.3% are barrage ponds. Oreochromis niloticus Linné, 1758 and Heterobranchus longifilis Valenciennes, 1840 are the most reared fish species. The total fish production in 2012 was estimated to 3,552.5 kg in 68 ponds. The produced quantities vary from a fish farmer to another, with an average production of 592.1±635.9 kg/fish farmer/year. All fish farmers (100% feed the fish with agricultural by-products. They have difficulties to feed them properly. They didn't receive funding, coaching and training. Some fish farmers (33.3% faced water problem. All these factors are an obstacle to sustainable management of fish farming in this area.

  3. Reproductive biology of the mullet Mugil liza (Teleostei: Mugilidae in a tropical Brazilian bay

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    Rafael J. Albieri

    2010-06-01

    Full Text Available The reproductive biology of Mugil liza Valenciennes, 1836 is described as a contribution to an elaborate management programm. A total of 243 specimens (89 males and 154 females were collected in the Sepetiba Bay in south-eastern Brazil from July/2006 to June/2007. The gonadosomatic index (I G and the sequential development of the ovaries observed through histological studies suggested that the spawning season ranged from May to August. The population reached total sexual maturity (L T100 at 550 and 570 mm total length (L T for males and females, respectively. Females attained a larger size than males, and the sex ratio was female-biased for fish larger than 500 mm L T. The hepatosomatic index (I H was significantly related to the I G, indicating that vitellogenesis mobilizes hepatic energy during reproduction. Mean fecundity was 3,080,000 oocytes. The presence of only two phases of oocyte development in ripe ovaries - a reserve stock and a clutch of post-vitellogenic oocytes - indicated that ovarian development is group synchronic and this species is characterized as a total spawner. The results suggest that establishing a closed fishing season from May to August and establishing a minimum size for capture of 350 mm L T would enhance stock conservation and production for future harvest seasons.

  4. An ecological and comparative analysis of parasites in juvenile Mugil liza (Pisces, Mugilidae from two sites in Samborombón bay, Argentina

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    Martin M. Montes

    2015-12-01

    Full Text Available ABSTRACT Mugil liza Valenciennes, 1836 is an economically important food fish and has been recommended for aquaculture in South America. A total of 278 fishes were collected in the spring and summer of 2009 and 2010. These fish were sorted into sample groups according to their size class. We used Bayesian statistics and 95% credible intervals for each parameter tested were calculated. Fish studied harbored a total of 15 different species of parasites. Diversity of parasite species found on Mugil liza was greatest at the S.R.C. collection site, but evidenced a lower species richness than at A.R. site. The 1st size fishes of both sites evidenced greater parasite diversity than either 2nd or 3rd size fish. Differences observed could be explained by the different use of habitat types at the two sites or differential susceptibility to infection by parasites. The dominance of D. fastigatainfluenced observed results of lower community diversity indexes. New works elucidating different parasite life cycles within juvenile and adults ofM. liza in Argentina, promise to be important for determining the risk of the parasitism by zoonotic metacercariae A. (P. longa and use of this fish as food and an economic resource, and the possible use of mullet parasites in other promising fields as indicators of biodiversity, and/ or water contamination.

  5. Gill monogenean communities on three commercially important sparid fish in Omani waters

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    Gilha Yoon

    2015-01-01

    Full Text Available The prevalence and intensity of polyopisthocotylean monogeneans on the gills of three commercially important species of sparid caught in Omani coastal waters close to the city port of Muscat were determined and compared. Throughout May 2012 to April 2013, infections on bi-weekly samples of the soldier seabream, Argyrops filamentosus (Valenciennes, 1830, the king soldier seabream, Argyrops spinifer (Forsskål, 1775, and, the silver seabream, Rhabdosargus sabra were evaluated. From a total of 200 specimens (standard length of 26–52 cm, caught by line angling or by traps, at least three species of gill monogenean, namely Omanicotyle [Bivagina] heterospina, Heteromicrocotyla sp. and Microcotyle sp., were commonly encountered. Silver bream, which was infected by all three monogeneans, bore the highest infections (100% prevalence; mean intensity of 20.14 ± 0.92 parasites fish-1, whilst the soldier bream, which was infected only by O. heterospina had the lowest levels of infection (of the three sparids with 63.8% prevalence; mean intensity 5.8 ± 0.17 parasites fish-1. Comments on the distribution of monogeneans on each host are provided but to what extent this is influenced by water current speeds passing through the buccal and opercular cavities, gill morphology, parasite size, and / or the morphology and efficiency of the parasite’s attachment apparatus requires establishing and forms the basis of ongoing investigations.

  6. Ensemble forecasting of potential habitat for three invasive fishes

    Science.gov (United States)

    Poulos, Helen M.; Chernoff, Barry; Fuller, Pam L.; Butman, David

    2012-01-01

    Aquatic invasive species pose major ecological and economic threats to aquatic ecosystems worldwide via displacement, predation, or hybridization with native species and the alteration of aquatic habitats and hydrologic cycles. Modeling the habitat suitability of alien aquatic species through spatially explicit mapping is an increasingly important risk assessment tool. Habitat modeling also facilitates identification of key environmental variables influencing invasive species distributions. We compared four modeling methods to predict the potential continental United States distributions of northern snakehead Channa argus (Cantor, 1842), round goby Neogobius melanostomus (Pallas, 1814), and silver carp Hypophthalmichthys molitrix (Valenciennes, 1844) using maximum entropy (Maxent), the genetic algorithm for rule set production (GARP), DOMAIN, and support vector machines (SVM). We used inventory records from the USGS Nonindigenous Aquatic Species Database and a geographic information system of 20 climatic and environmental variables to generate individual and ensemble distribution maps for each species. The ensemble maps from our study performed as well as or better than all of the individual models except Maxent. The ensemble and Maxent models produced significantly higher accuracy individual maps than GARP, one-class SVMs, or DOMAIN. The key environmental predictor variables in the individual models were consistent with the tolerances of each species. Results from this study provide insights into which locations and environmental conditions may promote the future spread of invasive fish in the US.

  7. Croissance de Auchenoglanis occidentalis (Pisces, Claroteidae dans le Delta Central du Niger (Mali, Afrique de l'ouest

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    Niaré, T.

    2013-01-01

    Full Text Available Growth of Auchenoglanis occidentalis (Pisces, Claroteidae in the Central Delta of Niger River Flood Plain (Mali, West Africa. Growth biology of Auchenoglanis occidentalis (Valenciennes, 1840 is studied from individuals monthly sampled on two different annual cycles (1991 and 1997 in the fishing port of Mopti. Individual age of fishes was determined by squelettochronology. Chronological follow-up of relative margin diameter (dr of spine ray section was used for validation of the periodicity of annulus formation. Only one annulus is formed annually. Period of growth recovery shows an individual variability with an early starting up from the lowwater level, in May. The seasonal cycle of growth of this benthic fish, A. occidentalis, depends more on the availability of the trophic resources than of abiotic factors. However, the optimal period of growth always remains the high-water one in this river with flood plain. Fishes condition factor's varies between 1.97±0.27 à 2.57±0.41. Year x season interaction affects this parameter. Growth realized during the first year (189.17±4.57 and 261.25±12.19 mm as well as the later growths depend on hydrological conditions and are influenced by fishing pressure. Presence of 3+ age class fishes shows that demographic structure is not qualitatively modified despite changes arisen in the Delta.

  8. L'exemple d'un décor religieux dans le nord de la France : Bruno Chérier (1817-1880 et Notre-Dame-des-Anges de Tourcoing

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    Catherine Guillot

    2012-04-01

    Full Text Available Ami et modèle du sculpteur Jean-Baptiste Carpeaux, Bruno Chérier (1817 Valenciennes, 1880 Paris se consacre à partir de la fin des années 1850 jusqu'à sa mort au décor religieux dans le nord de la France. Devenu en 1852 professeur aux écoles académiques de Tourcoing, il répond aux commandes les plus variées dans le domaine de l'art religieux. Ainsi, sa participation au décor de l'église Notre-Dame-des-Anges de Tourcoing est exemplaire de la diversité de ses contributions : chemin de croix, cartons de vitraux, peintures ornementales illusionnistes. Cette église constitue en outre dans le Nord un des rares témoignages conservé presque intégralement de l'art religieux dans la seconde moitié du XIXe siècle. La collaboration de Chérier à ce chantier témoigne d'un statut de l'artiste sous le Second Empire, éloigné de l'image romantique du créateur libre dont est redevable le mythe constitué autour de la figure de Carpeaux.Les auteurs préparent une étude globale de l'œuvre de Bruno Chérier et de son rôle auprès de Carpeaux.

  9. Fungal Infections in Some Economically Important Freshwater Fishes

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    Zafar Iqbal*, Uzma Sheikh and Rabia Mughal

    2012-06-01

    Full Text Available Aim of this study was to investigate fungal infections in four species of carps including goldfish, Carassius (C. auratus L.; silver carp, Hypophthalmichthys (H. molitrix Richardsons; rahu, Labeo (L. rohita Hamilton and Ctenopharyngodon (C. idella Valenciennes. Nine specimens of each species were studied for the presence of fungal infections. Infected fishes showed clinical signs such as fungal growth on skin, fins, eyes, eroded fins and scales, hemorrhages on body surface and abdominal distension. The specimens from infected organs of fish were inoculated on each, malt extract, Sabouraud dextrose and potato dextrose agars. The fungal colonies of white, black, green, grey and brown colors were observed in the agar plates. Slides were prepared and stained with 0.05% Trypan blue in lactophenol. C. auratus showed the highest infection rate (44.4% followed by H. molitrix and L. rohita (11.1% each. Five fungal species viz. Aspergillus (33.3%, Penicillium (22.2%, Alternaria (27.7%, Blastomyces spp (11.1% and Rhizopus (5.5% were isolated. Posterior part of the fish had significantly (P=0.05 higher (62.5% infection as compared to anterior part (37.5%. The caudal fin with 31.25% infection was the single most affected area. This study showed that most of the fungi isolated from fishes are considered as normal mycoflora, yet many fungi can cause natural infections in ponds and aquarium.

  10. Estabilidad temporal de las infracomunidades de parásitos en la borrachilla Scartichthys viridis (Valenciennes, 1836 (Pisces : Blenniidae en la costa central de Chile Temporal stability in parasite infracommunities of the blenny Scartichthys viridis(Valenciennes, 1836 (Pisces: Blenniidae on the central coast of Chile

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    FREDDY DÍAZ

    2002-12-01

    Full Text Available Se comparan las infracomunidades de parásitos de la borrachilla Scartichthys viridis (Pisces: Blenniidae de tres muestras tomadas en un lapso de 17 meses, entre 1999 y 2001, desde pozas intermareales vecinas a Las Cruces (33°27' S, 71°37' O, Chile central. El objetivo es averiguar si la riqueza, diversidad, abundancia y composición de las infracomunidades de parásitos son persistentes o no en el tiempo ontogenético y cronológico. Se recolectaron 10 taxa parasitarios en cerca del 89 % de los 63 huéspedes examinados, de los cuales ocho eran metazoarios. La búsqueda de protozoos se realizó sólo en los últimos 2 años. El 75 % de los ocho taxa de metazoos ocurrieron en los tres años, uno no estuvo presente en un año, y otro fue encontrado solamente en un año. La mayoría de los huéspedes examinados albergaba protozoos parásitos. La prevalencia de los protozoos Cryptobia sp. fue alta para ambos años, y menor en Trichodina sp. La longitud total de los huéspedes era un predictor relevante de las variaciones en la riqueza, abundancia, diversidad y composición infracomunitaria en el conjunto de los tres años. En cambio, el año de muestreo no lo fue, en particular al comparar entre huéspedes de similar longitud total. Estos resultados son similares a los encontrados en infracomunidades de parásitos de otras especies de peces en Chile, en que hay baja variabilidad en las propiedades agregadas de las infracomunidades en el tiempo cronológico. Se discute acerca de la extensión relativa del tiempo ontogenético en contraste al tiempo cronológico al ser probablemente ambos de importancia en las características de las infracomunidades, y se propone que se explore la medida en la cual estos resultados constituyen un patrón.Parasite infracommunities of the blenny Scartichthys viridis (Pisces: Blenniidae are compared among three samples taken within a 17-month period during three consecutive years (1999-2001, from intertidal pools at Las Cruces (33°27' S, 71°37' W, central Chile. Our goal is to assess if the richness, diversity, abundance and composition of parasite infracommunities are persistent or not through chronological time, as well as throughout the ontogeny of this herbivorous intertidal blenny. Ten parasitic taxa were found in ca. 89 % of all 63 host blennies examined, eight of which were metazoans. Protozoans were looked for in the last 2 years of the study only. Seventy five percent of all eight metazoan taxa occurred in all three years, one was absent in one year, and another was present in one only. Most of the blennies harbored protozoans. Prevalence of protozoan Cryptobia sp. was high in both years and lower in Trichodina sp. In the overall sample, total host body length was a relevant predictor of the variations in composition, richness, total abundance and diversity of parasite infracommunities. In contrast, the year of sampling was not, especially when infracommunities compared came from hosts of similar body size. These results agree with those of parasite infracommunities found in other fish host species in Chile, in that there is low compositional and aggregated variability along chronological time. The relative extension of ontogenetic versus chronological time is a subject to be explored further with respect to the amount of differentiation in these assemblages.

  11. Morphological and behavioral development of the piracanjuba larvae Desenvolvimento morfológico e comportamental de larvas de piracanjuba

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    Cláudia Maria Reis Raposo Maciel

    2010-05-01

    Full Text Available The objective of this work was to study the morphologic development and the swimming and feeding behaviors of piracanjuba larvae, Brycon orbignyanus Valenciennes (1849 (Characiformes, Characidae, Bryconinae, during the period from zero to 172 hours after hatching (standard length = 3.62 - 11.94 mm. The morphological analyses were accomplished by using a trinocular stereo microscope, while the behavioral analyses were performed through periodic observations. In 28 hours after hatching, the larvae (standard length = 6.25 ± 0.13 mm showed the following structural and behavioral characteristics that made them become active predators able to overcome a larval critical phase, the beginning of exogenous feeding: presence of pigmented eyes, terminal and wide mouth, developed oral dentition, developing digestive tube, yolk sac reduction, fins and swim bladder formation, horizontal swimming, cannibalism, and predation. Intense cannibalism among larvae was verified from 26 to 72 hours. At the end of the metamorphosis - 172 hours after hatching - the larvae measuring 11.94 + 0.80 mm in standard length presented a flexed notochord, caudal fin bifurcation, dorsal and anal fin formation, synchronized movements, and formation of shoals, characteristics that together allow enhanced perception and locomotio in exploration of the environment, determining the best moment for transfering to the fishponds. New studies can contribute to commercial fish farming by improving feeding management, performance, survival, and productivity of this species.Objetivou-se estudar o desenvolvimento morfológico e os comportamentos natatório e alimentar de larvas de piracanjuba, Brycon orbignyanus Valenciennes (1849 (Characiformes, Characidae, Bryconinae no período de 0 a 172 horas após a eclosão (comprimento-padrão = 3,62 - 11,94 mm. As análises morfológicas foram realizadas com auxílio de um microscópio estereoscópico trinocular e as comportamentais, por meio de

  12. Fish community structure of Juramento reservoir, São Francisco River basin, Minas Gerais, Brazil Estrutura da comunidade de peixes do reservatório de Juramento, bacia do Rio São Francisco, Minas Gerais, Brasil

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    André R. M. Silva

    2006-09-01

    Full Text Available Many rivers in Brazil as the São Francisco (SFR have been impounded for reservoirs construction purposes. However, there is a lack of knowledge on their fish fauna in many areas, including headwaters. The present study aimed to describe the fish community structure from Juramento reservoir, located on Juramento River, a branch of SFR basin. Six bimonthly samplings were made in four different sites. Gill and cast nets, beach seines and sieves were used to collect fish. Ecological indexes as well as the relationship between fish abundance and some limnological variables were determined. 3288 fish belonging to 33 species (16.5% of the total described for SFR basin were captured, being 75.7% Characiformes, 18.1% Siluriformes, 3% Cyprinodontiformes and 3% Gymnotiformes. Only two non-native species, 'tamboatá' - Hoplosternum littorale (Hancock, 1828 and 'trairão' - Hoplias lacerdae Ribeiro, 1908 were found. The highest catches in number occurred in the dry period (March-October and the lowest one in the wet season (November-February. Diversity was higher at Barragem station and richness did not vary between reservoir zones. Five migratory species were found downstream of the dam (four exclusively there, whereas only the 'curimbatá-pioa' - Prochilodus costatus Valenciennes, 1850 occurred in the reservoir. The low observed correlations between fish abundance and the limnological variables utilized suggest that the local fish fauna is not strongly affected by their variation.No Brasil, vários rios, como os da bacia do São Francisco (RSF, são barrados para a formação de reservatórios. Entretanto, o estudo desta ictiofauna, especialmente a dos rios de cabeceira, ainda deixa a desejar. O presente estudo descreveu a estrutura da ictiofauna do reservatório de Juramento, Rio Juramento, bacia do RSF. Foram realizadas seis coletas bimestrais em quatro locais empregando-se redes de emalhar, tarrafas, arrastões e peneiras. Foram determinados

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

    Science.gov (United States)

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

    2013-01-01

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

  14. Período reprodutivo de fêmeas de Hypostomus commersoni Valenciennes, 1836, em uma barragem na bacia do rio Uruguai

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    Rita Cristina Gomes Galarça

    2014-03-01

    Full Text Available http://dx.doi.org/10.5007/2175-7925.2014v27n2p87 O cascudo Hypostomus commersoni, nativo da Bacia do Rio Uruguai, pertencente à família Loricariidae, é encontrado habitualmente em ambientes lênticos e tem sua biologia ainda pouco conhecida na região do Pampa Brasileiro. Foi verificado o período reprodutivo pela análise da variação mensal do índice gonadossomático (IGS, do índice hepatossomático (IHS, e o fator de condição gonadal (∆K, além da observação macroscópica do estádio de desenvolvimento gonadal. Após a análise dos resultados pode se concluir que a espécie em estudo tem seu período reprodutivo de setembro estendendo-se a janeiro, atingindo seu pico de reprodução em novembro. Os indicadores IHS e ∆K apresentaram-se mais elevados no mês de outubro, demonstrando uma melhor condição gonadal e o IHS revelou um acúmulo de reservas lipídicas para fornecer energia na vitelogênese, no mês antecedente ao pico de reprodução, sendo desta forma, bons indicadores que corroboram com o período de reprodução determinado.

  15. Biological parameters and feeding behaviour of invasive whelk Rapana venosa Valenciennes, 1846 in the south-eastern Black Sea of Turkey

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    Hacer Saglam

    2014-06-01

    Full Text Available Objective: To determine length-weight relationships, growth type and feeding behavior of the benthic predator Rapa whelk at the coast of Camburnu, south-eastern Black Sea. Methods: Rapa whelk was monthly collected by dredge sampling on the south-eastern Black Sea at 20 m depth. The relationships between morphometric parameters of Rapa whelk were described by linear and exponential models. The allometric growth of each variable relative to shell length (SL was calculated from the function Y=aSLb or logY=loga+blogSL. The functional regression b values were tested by t-test at the 0.05 significance level if it was significantly different from isometric growth. The total time spent on feeding either on mussel tissue or live mussels was recorded for each individual under controlled conditions in laboratory. Results: The length-weight relationships showed positive allometric growth and no inter-sex variability. Body size in the male population was significantly higher than in the individuals of the female. All characters in males and females showed a trend towards allometry rather than isometry. While the total time spent feeding increased with increasing prey size the total time that Rapana venosa spent feeding decreased with increasing Rapa whelk size. The total average feeding time needed by Rapa whelks was 160 min. But they took 310 min on live mussels in 27-28 °C in the laboratory conditions. Conclusions: Length and weight relationships, growth type, total time spent feeding of this species were explained in details for this region. It would be useful to sustainable management in the south-eastern Black Sea of Turkey. The results about the feeding behaviour of this species will contribute to the understanding of the role of this species within the ecosystem.

  16. “New Mediterranean Biodiversity Records” (March 2017

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    L. LIPEJ

    2017-03-01

    Full Text Available This Collective Article presents information on 22 species belonging to 5 Phyla, arranged geographically from from west to east. The new records were found in 8 countries as follows: Spain: first record of the two scarcely known nemerteans Baseodiscus delineatus and Notospermus geniculatus in Formentera; Malta: second record of the alien fish Lagocephalus sceleratus; Italy: the alien polychaete Syllis pectinans and the isopod Paranthura japonica, as well as the cryptogenic opisthobranch Anteaeolidiella lurana, were found in the fouling assemblages along the docks of the port of Livorno. New decapod records are reported from Sicily (the alien Callinectes sapidus and the native Pachygrapsus maurus and Apulia (Percnon gibbosus and Procambarus clarkii; the lesser amberjack Seriola fasciata extended its geographical range to the Egadi Isands and Siganus luridus was documented for the first time along the Ionian coasts of Apulia and Calabria. Slovenia: the first record of the alien bivalve Brachidontes pharaonis is reported, together with a survey of up to date Adriatic records. Greece: the first record of the gastropod Rhinoclavis kochi is reported from Gavdos island. In addition, two records of endangered and rare cartilaginous fish were reported, namely, the shark Hexanchus griseus and the ray Leucoraja fullonica, as well as additional records of Siganus luridus for Lesvos and Malleus regula and Fulvia fragilis from Astypalaia. Turkey: the black wing flyingfish Hirundichthys rondeletii is reported for the very first time from the Black Sea. Egypt: the Indo-Pacific crab Halimede ochtodes is reported as established in Port Said. In addition, biometric parameters and meristic counts are reported for Anthias anthias in Damietta. Cyprus: the alien opisthobranch gastropod Bursatella leachii is reported for first time.

  17. Reproductive biology of round sardinella (Sardinella aurita in north-eastern Mediterranean

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    Athanassios C. Tsikliras

    2006-06-01

    Full Text Available The reproductive biology of round sardinella, Sardinella aurita Valenciennes, 1847, was studied for the first time in the north-eastern Mediterranean Sea. Round sardinella has gained much attention lately because of its biomass increase, which might be the result of climatic changes occurring across the Mediterranean Sea. Monthly samples were collected on board commercial purse-seiners for two complete year cycles (September 2000 to August 2002. Round sardinella is a gonochoristic fish. The overall female to male ratio was not statistically different (P=0.34 from unity, although it varied monthly and with the length of the fish. The seasonal changes in the gonadosomatic index and the macroscopic characteristics of gonads showed that round sardinella in the northern Aegean spawns between May and July. Male round sardinella reach first sexual maturity at a smaller total length than females (155.0 and 168.3 mm respectively. Mean absolute fecundity (FA increased exponentially with body length (FA=0.0949xL4.22 and weight (FA=511.19xW1.02, with an average of ~21,000 oocytes produced per spawning female. Relative fecundity (FR ranged between 242 and 681 oocytes/g of body weight (average: 445 oocytes/g. The frequency distribution of oocytes showed that round sardinella produces a single batch of oocytes. In general, the reproductive characteristics of round sardinella in the north-eastern Mediterranean Sea differed when compared to stocks from other areas of its distribution.

  18. Can the name Mugil cephalus (Pisces: Mugilidae) be used for the species occurring in the north western Atlantic?

    Science.gov (United States)

    Pacheco-Almanzar, Eloísa; Simons, James; Espinosa-Pérez, Héctor; Chiappa-Carrara, Xavier; Ibáñez, Ana L

    2016-05-09

    Menezes et al. (2010) show that Mugil cephalus Linnaeus, 1758 is different from Mugil liza Valenciennes 1836, the latter being the mullet found along the Atlantic coast of South America. They also suggest that individuals identified as M. cephalus from the northwest Atlantic could represent a population of M. liza in this region, since they doubt the presence of M. cephalus in waters colder than the ones of the West Indies. In order to clarify the presence of M. cephalus in the northwest Atlantic, this study compares meristic and morphometric measurements of M. cephalus and M. liza from the Gulf of Mexico with those obtained by Menezes et al. (2010) for M. liza from South America and for M. cephalus in the Mediterranean Sea. Results show that there are differences in both morphometric and meristic data between the two species. The morphometric measure that differentiates these species is the distance from the snout to the dorsal fin, which is positioned backwards in M. liza compared with M. cephalus. The body width is consistently greater in M. cephalus than M. liza. The meristic character that discriminates between both species is the number of scales in the longitudinal series that, in M. cephalus, ranges from 38 to 43 while in M. liza between 32 to 39. The information presented in this work confirms the presence of M. cephalus in the Gulf of Mexico and the sympatric presence of M. liza is established, even if its abundance is quite low.

  19. Caracterização microbiológica do veneno do ferrão do Bagre (Cathorops agassizii and Genidens genidens

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    Marcos Emerson Pinheiro Junqueira

    2006-12-01

    Full Text Available Este trabalho teve por objetivo o estudo da contaminação bacteriana do veneno do ferrão dos bagres Genidens genidens (Valenciennes, 1839; e Cathorops agassizii (Agassiz, 1829 encontrados no Complexo Baia-Estuário de Santos e de São Vicente (Estado de São Paulo. Foram obtidas amostras dos peixes para análises bacteriológicas que constituíam de um grupo de 50 espécimes sendo, 25 Cathorops agassizii e 25 de Genidens genidens. As análises bacteriológicas mostraram que havia contaminação nos ferrões por 13 diferentes linhagens de Enterobacteriaceae, sendo a Klebsiella pneumoniae (26,80% a bactéria mais freqüente enquanto que as Enterobacter sp e Escherichia coli (16,27%, Serratia marcescens, Serratia sp e Proteus mirabilis (1,16% apresentaram os mais baixos percentuais de contaminação. Nas amostras que apresentaram Bactérias Gram positivas não foram detectadas espécies de fungos. Enquanto que nas amostras que apresentaram bactérias Gram negativas, foi possível considerar alta contaminação bacteriana representando periculosidade em relação aos aspectos ambientais voltados á saúde pública. Destaca-se ainda que acidentes ocorridos por ferimentos causados em função do ferrão do bagre podem desenvolver significativas infecções secundárias agudas em humanos.

  20. Describing the body shape variation of spotted barb, Puntius binotatus (Valenciennes 1842 using fluctuating asymmetry from Tubay, Agusan del Norte, Philippines

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    C. J. Presilda

    2016-12-01

    Full Text Available This study aims to assess the condition of the water ecosystem in Tubay, Agusan del Norte by showing the level of FA on the bilateral symmetry of Puntius binotatus with respect to its sex that is known to be abundant in the area. This will show the status of P. binotatus in Tubay, Agusan del Norte that is known for having a mining activity in the area. Yet, there were no reports in the area that concerns with the developmental instability of P. binotatus and other fish inhabiting in the area using FA. Fluctuating Asymmetry (FA defined as a subtle random deviation between the left and right side of symmetrically bilateral organisms that measures the inability of organisms to maintain homeostasis or measures the developmental instability of organisms. A total of 200 individuals (100 male and 100 females were subjected to FA Analysis. Landmark analyses were obtained using Thin - plate Spline (TPS series with 16 landmarks generated for each sample and loaded into Symmetry and Asymmetry in Geometric Data (SAGE software. Procrustes ANOVA shows that individual symmetry has no significant difference. Sides and Interaction showed a high significantly difference (P<0.0001 which suggest being asymmetrical in the bilateral symmetry of P. binotatus population. The result of Principal Component Analysis (PCA shows a level of asymmetry with 77% in female and 73% in the male. FA in female fish can be seen in snout tip, anterior and posterior insertion of the dorsal fin, midpoint, or lateral line, dorsal base of pelvic fin, and dorsal base of pectoral fin. In male samples, affected landmarks can be seen in the anterior and posterior insertion of the dorsal fin, dorsal insertion of caudal fin and dorsal base of the pelvic fin. The level of FA specifies a good indicator of stressors in the environment that causes a decline in reproduction and population.

  1. From sea water to marine organisms; transfer to marine organisms

    International Nuclear Information System (INIS)

    Koyanagi, Taku

    1979-01-01

    As a study on transfer of radioiodine to marine organisms, accumulation and excretion of radioiodine by five species of marine fishes were observed by the aquarium experiments using Na 131 I as the tracer. Transfer of radioiodine to the fishes was examined on three different pathways, via seawater, sediment, and food. Concentration of radioiodine in organs of tissues of sea bass, Lateolabrax japonics, yellow tail, Seriola quinqueradiata, and rock fish, Sebastes nivosus, reared in labeled seawater reached maximum within five to ten days and decreased thereafter. Concentration factors calculated at the fifth day of breeding showed the highest value in gall-bladder followed by gut-content suggesting the secretion of bile into the intestine. Loss of radioactivity from the fishes showed two components elimination patterns and biological half-lives were calculated as 2.8 days and 53.5 days, respectively, in muscle of sea bass, for example. Sediment-bound radioiodine administered to benthic fish, right-eye flounder, Kareius bicoloratus, was lost rapidly after the administration but about ten per cent of the whole-body radioactivity were retained by the fishes after the excretion of sediment and eliminated with longer half-lives comparable to those taken up from seawater. Distribution of radioiodine among organs or tissues of the flounder was different between the fishes before and after the elimination experiment showing rapid loss from gill and slower elimination from liver or muscle. Radioiodine administered to sea bream, Pagrus major, as labeled anchovy was climinated also with two components loss processes and elimination rates were little higher than the fishes administered radioiodine as solution in gelatine capsules. Higher distribution of radioiodine in gill of the sea bream suggested the dominant excretion of radioiodine through gill of the fishes. (author)

  2. Reproduction of Mugil curema (Pisces: Mugilidae from the Cuyutlán lagoon, in the Pacific coast of México

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    E. G. Cabral-Solís

    2010-01-01

    Full Text Available Se analizó la reproducción de la lebrancha o liseta Mugil curema (Valenciennes, 1836 en la laguna de Cuyutlán, Colima, México. La relación macho:hembra fue 0.63:1.00. Los peces fueron capturados durante un año. Se observaron hembras ovígeras todo el año, con dos picos: uno en verano (agosto y otro en invierno (enerofebrero. Los machos y las hembras mostraron características de madurez sexual (L50 a la talla promedio, de 270 mm, y de 255 mm, que corresponden a cuatro y cinco años de edad, respectivamente. La talla mínima de reproducción en machos y hembras fue 105 mm de longitud total. El índice gonadosomático fue más alto en agosto y febrero. La relación alométrica del índice hepatosomático fue LW = 6.00·10-6·TL4.013. Los factores de condición de Fulton y Safran se incrementaron de diciembre a marzo. La fecundidad varió, de 9,612 a 238,795 ovocitos en hembras de cero a cinco años de edad, y la fecundidad relativa promedio fue de 1,120 oocitos·g-1 (850 a 1,176 ovocitos·g-1. Los resultados sugieren establecer una temporada de veda del 15 de junio al 15 de septiembre, y el uso del tamaño de malla reglamentario, que es de 2 ¾ pulgadas, en las redes agalleras.

  3. A comparative study of Ligophorus uruguayense and L. saladensis (Monogenea: Ancyrocephalidae) from Mugil liza (Teleostei: Mugilidae) in southern Brazil.

    Science.gov (United States)

    Marchiori, Natalia C; Pariselle, Antoine; Pereira, Joaber; Agnese, Jean-Francois; Durand, Jean-Dominique; Vanhove, Maarten P M

    2015-01-01

    Representatives of Ligophorus Euzet et Suriano, 1977 were found on the gills of Mugil liza Valenciennes caught in southern Brazil. They were identified as Ligophorus uruguayense Failla Siquier et Ostrowski de Núñez, 2009 and Ligophorus saladensis Marcotegui et Martorelli, 2009, even though specific identification proved to be difficult due to inconsistencies in some diagnostic features reported for these two species. Therefore, a combined morphological and molecular approach was used to critically review the validity of these species, by means of phase contrast and confocal fluorescence microscopical examination of sclerotised hard parts, and assessing the genetic divergence between L. saladensis, L. uruguayense and their congeners using rDNA sequences. The main morphological differences between the two species relate to the shape of the accessory piece of the penis and the median process of the ventral bar. The accessory piece in L. uruguayense is shorter than in L. saladensis, has a cylindrical, convex upper lobe and straight lower lobe (vs with the distal tip of the lower lobe turning away from the upper lobe in the latter species). The ventral bar has a V-shaped anterior median part in L. uruguayense (vs U-shaped in L. saladensis). The two species are suggested to be part of a species complex together with L. mediterraneus Sarabeev, Balbuena et Euzet, 2005. We recommend to generalise such comparative assessment of species of Ligophorus for a reliable picture of the diversity and diversification mechanisms within the genus, and to make full use of its potential as an additional marker for mullet taxonomy and systematics.

  4. Estimation of dynamic energy budget parameters for the Mediterranean toothcarp (Aphanius fasciatus)

    Science.gov (United States)

    Rinaldi, A.; Montalto, V.; Lika, K.; Sanfilippo, M.; Manganaro, A.; Sarà, G.

    2014-11-01

    Organisms adopt different sets of physiological, behavioural and morphological trade-offs in order to cope with natural environmental fluctuations. This has consequential rebounds on ecological processes and population dynamics. Such aspects become crucial for sex-dimorphic species, where sex-specific growth variation could mirror different tactics both in energy acquisition and investment between maximum female and male body size with cascading effects on population demography. To date, different approaches have been used in order to understand the causes of individual growth rate changes in ectotherm indeterminate growers, most of which failed. Here, we propose the use of a mechanistic model based on the Dynamic Energy Budget theory (DEB; Koojiman, 2010) to investigate potential differences in energy allocation strategies adopted by individuals of different genders with the Mediterranean toothcarp Aphanius fasciatus (Valenciennes, 1821) as the model species. We collected literature and field data in order to study differences in energy allocation strategies between females and males of the same species by generating projections of possible growth performances: (1) throughout their entire life span and (2) under a context of varying functional responses. Generally, the present exercise of simulations returned different patterns of growth performance among females and males of A. fasciatus, with the former being able to better optimize energetic trade-offs under optimal environmental conditions. The present DEB parameterization exercise represents an essential step towards developing a mechanistic approach to depict metabolic strategies, which are at the base of observed sexual differences, and how such differences may impair ultimate fitness at individual and, therefore, population levels.

  5. Pathogenic ability and saline stress tolerance of two Fusarium isolates from Odontesthes bonariensis eggs.

    Science.gov (United States)

    Pacheco Marino, Suani G; Cabello, Marta N; Dinolfo, María I; Stenglein, Sebastián A; Saparrat, Mario C N; Salibián, Alfredo

    2016-01-01

    Several fungal species represent a potential risk to embryos of Odontesthes bonariensis (Cuvier and Valenciennes, 1835), a euryhaline freshwater fish that lives in the Pampean inland waters and has potential economic relevance. To identify two fungi isolated from O. bonariensis eggs exposed to saline conditions and to characterize their pathogenicity and tolerance to sodium chloride solutions. The isolates were identified by morphological features, and a preliminar phylogenetic analysis using sequences of translation elongation factor 1-alpha (EF-1α) and calmodulin (CAM) was performed. Koch's postulates were tested to identify the causative agent of fungal infection. The influence of NaCl on the fungal growth was evaluated in in vitro assays. The isolates LPSC 1001 and 1002 were identified as representatives of the genus Fusarium, and belonging to the Fusarium incarnatum-Fusarium equiseti species complex (FIESC) and the Fusarium solani species complex (FSSC), respectively. Histological observations on eggs exposed in vitro to both isolates in infectivity assays confirmed the ability of the fungal isolates to penetrate to egg's chorionic membrane, leading to the death of embryos. Increasing NaCl concentration in the culture medium reduced the growth of the isolates LPSC 1001 and 1002, being completely inhibited at 160 and 120g/l NaCl respectively. The isolates LPSC 1001 (FIESC) and 1002 (FSSC) were identified as fungal pathogens to O. bonariensis eggs. The use of NaCl solutions as antifungal treatment was not effective to control the infection with these strains. Copyright © 2014 Asociación Española de Micología. Published by Elsevier Espana. All rights reserved.

  6. Concentration activities of natural radionuclides in three fish species in Brazilian coast and their contributions to the absorbed doses

    International Nuclear Information System (INIS)

    Pereira, Wagner de S.; Py Junior, Delcy de A.; Kelecom, Alphonse

    2009-01-01

    Activity concentrations of U-238, Ra-226, Pb-210, Th-232 e Ra-228 were analysed in three fish species at the Brasilian Coast. The fish 'Cubera snapper' (Lutjanus cyanopterus, Cuvier, 1828), in the region of Ceara and 'Whitemouth croaker' (Micropogonias furnieri, Desmarest, 1823) and 'Lebranche mullet' (Mugil liza, Valenciennes, 1836) in the region of Rio de Janeiro. These concentrations were transformed in absorbed dose rate using a dose conversion factor in unit of gray per year (μGy y -1 ), per becquerel per kilogram (Bq kg -1 ). Only the absorbed dose due to intake of radionuclides was examined, and the contributions due to radionuclides present in water and sediment were disregarded. The radionuclides were considered to be uniformly distributed in the fish body. The limit of the dose rate used, proposed by the Department of Energy of the USA, is equal to 3.65 10 03 mGy y -1 . The average dose rate due to the studied radionuclides is equal to 6.09 10 00 μGy y -1 , a value minor than 0.1% than the limits indicated by DOE, and quite similar to that found in the literature for 'benthic' fish. The most important radionuclides were the alpha emitters Ra-226 having 61 % of absorbed dose rate. U-238 and Th-232, each contributes with approximately 20 % of the absorbed dose rate. These three radionuclides are responsible for almost 100% of the dose rate received by the studied organisms. The beta emitters Ra-228 and Pb-210 account for approximately 1 % of the absorbed dose rate. (author)

  7. Histopathological and bacterial study of skin and gill of grass carp, Ceteopharyngodon idella, (Valenciennes 1844) exposed to copper sulfate and potassium permanganate.

    Science.gov (United States)

    Jooyandeh, Fatemeh; Sadeghpour, Ali; Khara, Hossein; Pajand, Zabihollah

    2016-09-01

    The gill histology and bacterial load of skin of the grass carp juveniles were investigated in relation to various concentrations of copper sulfate and potassium permanganate. For this purpose, the sublethal doses were determined after a pre-test and then the experiment was done in five treatments (for copper sulfate: 1, 1.94, 3.71, 7.07 and 15 mg/l and for potassium permanganate: 0.25, 0.52, 1.91, 2.27 and 5 mg/l) with three replicates inside the glass aquaria. Also, one group without disinfecting product was considered as control for each experiment. The microbial and histopathological investigations were done after 96 h exposure. According to results, the lowest bacterial load (CFU/g) of skin was observed in 15 mg/l copper sulfate treatment and 0.25 mg/l potassium permanganate treatment (P permanganate. In this regard, the highest histological damages were observed in 15 mg/l copper sulfate and 5 mg/l potassium permanganate respectively. Our results showed that low dosage of potassium permanganate has best effect on reducing of bacterial load of skin with lowest adverse effects on gill tissue.

  8. Influence of spawning procedure on gametes fertilization success in Salminus hilarii Valenciennes, 1850 (Teleostei: Characidae: Implications for the conservation of this species

    Directory of Open Access Journals (Sweden)

    Renato M. Honji

    2011-06-01

    Full Text Available Artificial reproduction and gamete fertilization were evaluated in Salminus hilarii wild and domesticated broodstocks. Wild and domesticated broodstocks were artificially induced to reproduction using a carp pituitary treatment. Four groups were considered: Group 1 (G1, fish caught in the wild maintained for three years in the same conditions as the domesticated broodstocks and spawned naturally; Group 2 (G2, broodstock born and raised in captivity and spawned naturally; Group 3 (G3, wild broodstocks, which were manually stripped for gamete collection and dry fertilization; and Group 4 (G4, domesticated males and females, also manually stripped. Oocytes, eggs, and larvae were sampled at different time intervals throughout embryonic development. Yolk sac absorption occurred approximately 24-29 h after hatching. Twenty-six h after hatching, the larvae mouths opened. Cannibalism was identified just 28-30 h after hatching. There was no morphological difference in embryonic development among all groups. The number of released eggs per gram of female was: G1: 83.3 ± 24.5 and G2: 103.8 ± 37.4; however, the fertilization success was lower in G2 (42.0 ± 6.37 % compared with G1 (54.7 ± 3.02% (P = 0.011. Hand-stripping of oocytes was not successful and the fertilization rate was zero. The reproduction of this species in captivity is viable, but it is necessary to improve broodstock management to enhance fertilization rates and obtain better fingerling production for restocking programs.A reprodução artificial e fertilização dos gametas foram avaliados em reprodutores selvagens e de cativeiro de Salminus hilarii. Reprodutores selvagens e de cativeiro foram induzidos artificialmente à reprodução utilizando hipófise de carpa. Quatros grupos foram considerados: Grupo 1 (G1, peixes capturados na natureza, mantidos por três anos nas mesmas condições de reprodutores de cativeiro e desovados naturalmente; Grupo 2 (G2, reprodutores nascidos e criados em cativeiro e desovados naturalmente; Grupo 3 (G3, reprodutores selvagens que foram extrusados manualmente para a coleta de gametas e fertilização a seco; e Grupo 4 (G4, com machos e fêmeas domesticadas, também extrusados manualmente. Oócitos, ovos e larvas foram amostrados em diferentes intervalos de tempo ao longo do desenvolvimento embrionário. A absorção do saco vitelínico ocorreu aproximadamente 24-29 h após a eclosão. Vinte e seis h após a eclosão, as larvas abriram a boca. O canibalismo foi identificado apenas 28-30 h após a eclosão. Não houve diferença morfológica no desenvolvimento embrionário entre todos os grupos. O número de ovos liberados por grama de fêmea foi: G1: 83,3 ± 24,5 e G2: 103,8 ± 37,4; embora, o sucesso na fertilização tenha sido menor no G2 (42,0 ± 6,37% em comparação com G1 (54,7 ± 3,02% (P = 0,011. A extrusão manual dos oócitos não foi bem sucedida e a taxa de fertilização foi zero. A reprodução em cativeiro desta espécie é viável, mas é necessário um melhor manejo dos reprodutores para aumentar as taxas de fertilização, visando a obtenção de uma melhor produção de alevinos para os programas de repovoamento.

  9. Assessment and management of white mullet Mugil curema (Valencienne, 1836 (Mugilidae fisheries of the south coast of São Paulo state, Brazil

    Directory of Open Access Journals (Sweden)

    JT. Mendonça

    Full Text Available There is intense fishing activity, mainly artisanal, in the Cananéia, Iguape and Ilha Comprida Estuarine System. White mullet (Mugil curema is one of the local fishery resources and is usually caught with gillnets and fish traps. This study aimed to characterise the Mugil curema fisheries thereby underpinning the management of the species in the region. The study was developed with data collected from landings in the town of Cananéia, São Paulo state, Brazil, from 1995 to 2009. Production data, fishing effort and CPUE were used to assess the evolution of captures. The gillnets were characterised by interviewing fishermen from 16 communities in Cananéia. White mullet fishery has aroused the interest of fishermen in the region since the 80s and today it is one of the main products of artisanal estuarine fishery off the south coast of São Paulo. The major landings occur in the warmer months with fish traps and gillnets being the main fishing gear used. The largest catches occur in the spawning months of the species from October to April. The highest landings varied according to different fishing gear, showing differences primarily due to trade preferences and to the structure of the fishing gear. According to the index of abundance used in this study, the resource is overfished due to the progressive increase in fishing effort, so it is suggested that measures should be taken to control fishing effort, such as special fishing permits to catch white mullet, especially with gillnets. The current management measures neither meet the needs of fishermen nor the preservation of the resource, and must be reviewed in a participatory way with management agencies and the fishery sector, ensuring greater legitimacy and success in the sustainability of the activity.

  10. Assessment and management of white mullet Mugil curema (Valencienne, 1836) (Mugilidae) fisheries of the south coast of São Paulo state, Brazil.

    Science.gov (United States)

    Mendonça, J T; Bonfante, T M

    2011-08-01

    There is intense fishing activity, mainly artisanal, in the Cananéia, Iguape and Ilha Comprida Estuarine System. White mullet (Mugil curema) is one of the local fishery resources and is usually caught with gillnets and fish traps. This study aimed to characterise the Mugil curema fisheries thereby underpinning the management of the species in the region. The study was developed with data collected from landings in the town of Cananéia, São Paulo state, Brazil, from 1995 to 2009. Production data, fishing effort and CPUE were used to assess the evolution of captures. The gillnets were characterised by interviewing fishermen from 16 communities in Cananéia. White mullet fishery has aroused the interest of fishermen in the region since the 80s and today it is one of the main products of artisanal estuarine fishery off the south coast of São Paulo. The major landings occur in the warmer months with fish traps and gillnets being the main fishing gear used. The largest catches occur in the spawning months of the species from October to April. The highest landings varied according to different fishing gear, showing differences primarily due to trade preferences and to the structure of the fishing gear. According to the index of abundance used in this study, the resource is overfished due to the progressive increase in fishing effort, so it is suggested that measures should be taken to control fishing effort, such as special fishing permits to catch white mullet, especially with gillnets. The current management measures neither meet the needs of fishermen nor the preservation of the resource, and must be reviewed in a participatory way with management agencies and the fishery sector, ensuring greater legitimacy and success in the sustainability of the activity.

  11. Influence of spawning procedure on gametes fertilization success in Salminus hilarii Valenciennes, 1850 (Teleostei: Characidae: Implications for the conservation of this species

    Directory of Open Access Journals (Sweden)

    Renato M. Honji

    Full Text Available Artificial reproduction and gamete fertilization were evaluated in Salminus hilarii wild and domesticated broodstocks. Wild and domesticated broodstocks were artificially induced to reproduction using a carp pituitary treatment. Four groups were considered: Group 1 (G1, fish caught in the wild maintained for three years in the same conditions as the domesticated broodstocks and spawned naturally; Group 2 (G2, broodstock born and raised in captivity and spawned naturally; Group 3 (G3, wild broodstocks, which were manually stripped for gamete collection and dry fertilization; and Group 4 (G4, domesticated males and females, also manually stripped. Oocytes, eggs, and larvae were sampled at different time intervals throughout embryonic development. Yolk sac absorption occurred approximately 24-29 h after hatching. Twenty-six h after hatching, the larvae mouths opened. Cannibalism was identified just 28-30 h after hatching. There was no morphological difference in embryonic development among all groups. The number of released eggs per gram of female was: G1: 83.3 ± 24.5 and G2: 103.8 ± 37.4; however, the fertilization success was lower in G2 (42.0 ± 6.37 % compared with G1 (54.7 ± 3.02% (P = 0.011. Hand-stripping of oocytes was not successful and the fertilization rate was zero. The reproduction of this species in captivity is viable, but it is necessary to improve broodstock management to enhance fertilization rates and obtain better fingerling production for restocking programs.

  12. Viral replication in excised fin tissues (VREFT) corresponds with prior exposure of Pacific herring, Clupea pallasii (Valenciennes), to viral haemorrhagic septicaemia virus (VHSV)

    Science.gov (United States)

    Grady, C.A.; Gregg, J.L.; Wade, R.M.; Winton, J.R.; Hershberger, P.K.

    2011-01-01

    Procedures for a viral replication in excised fin tissue (VREFT) assay were adapted to Pacific herring, Clupea pallasii, and optimized both to reduce processing time and to provide the greatest resolution between na??ve herring and those previously exposed to viral haemorrhagic septicaemia virus (VHSV), Genogroup IVa. The optimized procedures included removal of the left pectoral fin from a euthanized fish, inoculation of the fin with >105 plaque-forming units (PFU) mL-1 VHSV for 1 h, rinsing the fin in fresh medium six times to remove unadsorbed virions, incubation of the fin in fresh medium for 4 days and enumeration of the viral titre in a sample of the incubation medium by plaque assay. The optimized VREFT assay was effective at identifying the prior exposure history of laboratory-reared Pacific herring to VHSV. The geometric mean VREFT value was significantly greater (P < 0.01) among na??ve herring (1.2 ?? 103 PFU mL-1) than among groups that survived exposure to VHSV (1.0-2.9 ?? 102 PFU mL-1); additionally, the proportion of cultures with no detectable virus was significantly greater (P = 0.0002) among fish that survived exposure to VHSV (39-47%) than among na??ve fish (3.3%). The optimized VREFT assay demonstrates promise for identifying VHSV exposure history and forecasting disease potential in populations of wild Pacific herring. ?? 2010 Blackwell Publishing Ltd.

  13. Calcium and phosphorus determination in bones of low value fishes, Sardinella longiceps (Valenciennes and Trichiurus savala (Cuvier, from Parangipettai, Southeast Coast of India

    Directory of Open Access Journals (Sweden)

    Logesh AR

    2012-05-01

    Full Text Available Objective: To investigate calcium and phosphorus levels in the bones of low value fishes Sardinella longiceps (oil sardine and Trichiurus savala (ribbon fish. Methods: Bones and skeletal remains were subjected to alkaline-alcohol treatment for specified period of time and were then dried and pulverized. Calcium and phosphorus levels were determined by both volumetric and instrumental methods using atomic absorption spectroscopy. Results: Volumetric analysis of calcium and phosphorus were 28.98% and 14.2% in oil sardine; 24.2% and 11.6% in ribbon fish respectively. Atomic absorption spectroscopy analysis of calcium and phosphorus were 32.73% and 17.2% for oil sardine and 27.17% and 10.83% for ribbon fish respectively. Protein level was 4.82% in oil sardine and 3.97% in ribbon fishes. Conclusions: The findings of the present study revealed that sardine bones are rich in calcium and will be utilized for the production of calcium powder to treat osteoporosis.

  14. A new species of Tometes Valenciennes 1850 (Characiformes: Serrasalmidae from Tocantins-Araguaia River Basin based on integrative analysis of molecular and morphological data.

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    Marcelo C Andrade

    Full Text Available A new large serrasalmid species of Tometes is described from the Tocantins-Araguaia River Basin. Tometes siderocarajensis sp. nov. is currently found in the rapids of the Itacaiúnas River Basin, and formerly inhabited the lower Tocantins River. The new species can be distinguished from all congeners, except from T. ancylorhynchus, by the presence of lateral space between 1st and 2nd premaxillary teeth, and by the absence of lateral cusps in these two teeth. However, T. siderocarajensis sp. nov. can be differentiated from syntopic congener T. ancylorhynchus by an entirely black with mottled red body in live specimens, densely pigmented pelvic fins with a high concentration of dark chromatophores, and the presence of 39 to 41 rows of circumpeduncular scales (vs. silvery body coloration with slightly reddish overtones on middle flank during breeding period in live specimens, hyaline to slightly pale coloration on distalmost region of pelvic fins, and 30 to 36 rows of circumpeduncular scales. Additionally, molecular sequence shows that T. siderocarajensis sp. nov. is reciprocally monophyletic, and diagnosable from all congeners by having two autapomorphic molecular characters in the mitochondrial gene COI. The phylogenetic reconstruction still show that T. siderocarajensis sp. nov. is closely related to T. trilobatus. This is the first molecular study using an integrative taxonomic approach based on morphological and molecular sequence data for all described species of Tometes. These findings increase the number of formally described species of Tometes to seven. A key to the Tometes species is provided.

  15. Theory and experimentation of wood gasification

    Energy Technology Data Exchange (ETDEWEB)

    Matton, G; Thomas, D G [Lab. d' Etude de l' Utilisation Rationnelle des Energies, et de la Diversification des Sources d' Energie, Universite de Valenciennes et du Hainaut Cambresis, 59 - Valenciennes (France); Delval, P [Moteurs DUVANT, 59 - Valenciennes (France)

    1984-01-01

    In this paper we propose a simplified theory of gasification of wood at various moisture contents. After writing the combustion equation of wood with a known moisture content, we balance the atoms on each side of this equation and introduce a reaction temperature which gives the equilibrium constant for the equation of gasification. Solving these simultaneous equations by combining them with the energy equation and the heating value of wood, we get the wet or dry volume compositions of the producer-gas. The experiments were made during a collaboration between The University of Valenciennes and the sub-company SERMIE from MOTEURS DUVANT. The gasifier is a double-body De Lacotte gazogene which works with air and has a capacity of ten tons per day. The gas has a flow rate of about 0,28 m/sup 3//s and its mean composition is the following one: CO/sub 2/: 16% CO: 12% H/sub 2/: 20% N/sub 2/: 51% CH/sub 4/: 0,50%. The theoretical and experimental compositions of the gas fit fairly well with a reaction temperature of 1000 K and about 28 per cent moisture content on a green basis. The gas-generator has an energy efficiency of 70%. As gas-flow rate of 0,15 m/sup 3//s with a lower calorific value of 3726-4331 kJ/N m/sup 3/ is enough to supply a 510 kW dual-fuel engine DUVANT with a thermal efficiency of 34% against 37% for the same gas-oil engine. The engine coupled to an alternator of 600 kVA can provide electric power in factories or forest-areas.

  16. Hidden Diversity in the Populations of the Armored Catfish Ancistrus Kner, 1854 (Loricariidae, Hypostominae from the Paraná River Basin Revealed by Molecular and Cytogenetic Data

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    Ana C. Prizon

    2017-11-01

    Full Text Available Only one species of armored catfish, Ancistrus cirrhosus Valenciennes 1836, has been historically described in the basin of the Paraná River, from Misiones (Argentina. However, the ample variation found in the morphology and coloration of the populations sampled in the tributaries of the Brazilian state of Paraná makes it difficult to establish the real taxonomic status and evolutionary history of the Ancistrus specimens, suggesting that A. cirrhosus is not the only species found in this basin. By combining data on mitochondrial DNA (COI gene and chromosomal markers from different Ancistrus populations, totaling 144 specimens, in the tributaries of the Paraná, and specimens from Misiones (type-locality of A. cirrhosus, we detected five distinct evolutionary lineages. All the specimens were 2n = 50, but had four distinct karyotype formulae. The results of the Generalized Mixed Yule Coalescent (GYMC and the genetic distances (uncorrected P-values between lineages ranged from 3 to 5%. Clusters of 18S rDNA were observed in a single chromosome pair in seven populations of Ancistrus, but at different positions, in some cases, in synteny with the 5S rDNA sites. Multiple 5S sites were observed in all populations. Overall, the cytogenetic data reinforce the genetic evidence of the diversification of lineages, and indicate the existence of candidate species in the study region. The evidence indicates that at least four candidate species of the Ancistrus may coexist in the Paraná basin besides A. cirrhosus. Overall, our results provide a comprehensive scenario for the genetic variation among Ancistrus populations and reinforce the conclusion that the true diversity of the freshwater fish of the Neotropical regions has been underestimated.

  17. La pesquería de tiburones oceánicos-costeros en los litorales de Colima, Jalisco y Michoacán

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    Angélica Cruz

    2011-06-01

    Full Text Available La pesquería de tiburón es una de las más importantes en el Pacífico mexicano, en la actualidad no se cuentan con los datos de la composición específica de las capturas de las diferentes flotas. En el presente trabajo se describen aspectos biológicos-pesqueros de las especies de tiburón, capturadas por la flota palangrera de mediana altura del puerto de Manzanillo, en un periodo anual de abril 2006-abril 2007, los muestreos se realizaron mensualmente a bordo de estas embarcaciones. La composición de las capturas estuvo representada por nueve especies (n=1 962, de las cuales Carcharhinus falciformis (Bibron, 1839 (88.12% sostiene esta pesquería y en segundo lugar Prionace glauca (Linnaeus, 1758 (8.21%. Las especies poco frecuentes fueron Sphyrna zygaena (Linnaeus, 1758 con (1.78%, Alopias pelagicus (Nakamura, 1935 (0.82%, Carcharhinus longimanus (Poey, 1861 (0.45%, Alopias superciliosus (Lowe, 1839 (0.35%, Carcharhinus leucas (Valenciennes, 1839 (0.1%, Carcharhinus limbatus (Valenciennes, 1839 (0.1% é Isurus oxyrinchus (Rafinesque, 1810 (0.05%. La fecundidad estimada para C. falciformis fue de 3-7 crías/hembra con tallas de 30-45cm LT; 40.57+2.03cm LT y P. glauca con 5-52 crías/hembra, con tallas de 5-18.6cm LT; 11.61±0.21cm LT. Por lo tanto se asume que C. falciformis presenta un ciclo concurrente y P. glauca probablemente un ciclo bianual consecutivo.Fishery of oceanic and coastal sharks in Colima, Jalisco and Michoacán. Shark fishery is one of the most important activities in the Mexican Pacific coast, nevertheless, there is few data available about the specific captures done by the fleet along the coast. This study describes fishery biology aspects of the shark species catched by the semi-industrial long-line fleet of Manzanillo. Monthly samplings were made on board of these vessels during an annual period from April 2006 to April 2007. Captured species composition (n=1 962 organisms was represented by nine species. The one

  18. El comercio en las estrategias de vertebración territorial de la Comunidad Valenciana

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    Ponce Herrero, Gabino

    2014-06-01

    programas económicos, con un modesto soporte urbanístico, para recuperar el atractivo económico perdido y regenerar la capacidad de la ciudad para el encuentro y la relación. Sin embargo, por su carácter puntual, no han logrado contrarrestar los grandes movimientos centrífugos del equipamiento comercial. [fr] Le modèle de ville expansive, qui s’est amplement développé dans la Communauté valencienne, provoque des changements dans les comportements des citadins et donc dans leurs habitudes de consommation, conditionnées par les designs très attractifs des nouveaux centres commerciaux et surtout par la vocation de ceux-ci à être des lieux de loisirs. Ces processus transforment profondément le modèle commercial et les modes de relation sociale dans les villes. Les premiers gouvernements autonomes de la Communauté valencienne ont mis en place un dispositif légal qui avait l’intention de réglementer et de profiter du rôle du commerce en tant qu’instrument de cohésion sociale et territoriale. Cela a donné lieu à des Plans d’Action Commerciale voués à la sauvegarde et au maintien des anciens espaces commerciaux urbains (centres historiques et zones d’expansion, très affectés par ces changements. Il s’agit de programmes économiques, dotés d’un support urbanistique modeste, destinés à récupérer l’attrait économique déchu et à régénérer la capacité des villes en tant que lieux de rencontre et de relation sociale. Cependant, dû à leur caractère ponctuel, ces plans ne sont pas parvenus à contrecarrer les grands mouvements centrifuges de l’équipement commercial.

  19. Species distribution models of tropical deep-sea snappers.

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    Céline Gomez

    Full Text Available Deep-sea fisheries provide an important source of protein to Pacific Island countries and territories that are highly dependent on fish for food security. However, spatial management of these deep-sea habitats is hindered by insufficient data. We developed species distribution models using spatially limited presence data for the main harvested species in the Western Central Pacific Ocean. We used bathymetric and water temperature data to develop presence-only species distribution models for the commercially exploited deep-sea snappers Etelis Cuvier 1828, Pristipomoides Valenciennes 1830, and Aphareus Cuvier 1830. We evaluated the performance of four different algorithms (CTA, GLM, MARS, and MAXENT within the BIOMOD framework to obtain an ensemble of predicted distributions. We projected these predictions across the Western Central Pacific Ocean to produce maps of potential deep-sea snapper distributions in 32 countries and territories. Depth was consistently the best predictor of presence for all species groups across all models. Bathymetric slope was consistently the poorest predictor. Temperature at depth was a good predictor of presence for GLM only. Model precision was highest for MAXENT and CTA. There were strong regional patterns in predicted distribution of suitable habitat, with the largest areas of suitable habitat (> 35% of the Exclusive Economic Zone predicted in seven South Pacific countries and territories (Fiji, Matthew & Hunter, Nauru, New Caledonia, Tonga, Vanuatu and Wallis & Futuna. Predicted habitat also varied among species, with the proportion of predicted habitat highest for Aphareus and lowest for Etelis. Despite data paucity, the relationship between deep-sea snapper presence and their environments was sufficiently strong to predict their distribution across a large area of the Pacific Ocean. Our results therefore provide a strong baseline for designing monitoring programs that balance resource exploitation and

  20. Genetic variation in the mitochondrial genome of the giant grouper Epinephelus lanceolatus (Bloch, 1790 and its application for the identification of broodstock

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    Seng S. Cheng

    2015-11-01

    Full Text Available Mitochondrial DNA (mtDNA markers are ideal for the validation of maternal inheritance and the identification of brood-stock in aquaculture breeding programs. The complete mitochondrial genomes of 11 species of grouper are currently available at the GenBank. This study was directed towards the characterization of mtDNA loci which can be applied for identification of interspecific F1 hybrids developed from Epinephelus fuscoguttatus and Epinephelus lanceolatus in aquaculture breeding programs. DNA was extracted from the fin clip of one specimen of E. lanceolatus which the source of sperm for the artificial spawning of the interspecific F1 hybrid E. fuscoguttatus × E. lanceolatus. Specific primers were designed to amplify the DNA after comparative analysis of the mtDNA genomes available at the GenBank. The primers were applied to test for cross-amplification in F1 hybrids as well as in the maternal parent E. fuscoguttatus (Forsskål, 1775 and the genetically related species Epinephelus coioides and Epinephelus corallicola (Valenciennes, 1828. DNA sequence analysis revealed that the Malaysian variety of E. lanceolatus exhibited variation at 11 of the 13 ORFs when compared to the variety from Taiwan. A distinct segmented duplication was observed in the D-loop region which was determined to be unique to the E. lanceolatus specimen obtained from Sabah, Malaysia. Cross amplification of mtDNA loci in the groupers E. fuscoguttatus, E. coioides, E. corallicola and the F1 hybrid of E. fuscoguttatus × E. lanceolatus revealed distinct profiles for each of the species with a clear indication that mtDNA were inherited from the maternal parent of the F1 hybrid.. mtDNA loci can be applied by fish breeders to determine interspecific hybridization events.

  1. Assessing gear modifications needed to optimize yields in a heavily exploited, multi-species, seagrass and coral reef fishery.

    Science.gov (United States)

    Hicks, Christina C; McClanahan, Timothy R

    2012-01-01

    Effective management is necessary if small-scale fisheries, such as those found in mixed habitats including seagrass and coral reefs, are to continue providing food for many of the poorest communities of the world. Gear-based management, although under represented and under studied, has the potential to be adaptive, address multiple objectives, and be crafted to the socio-economic setting. Management effectiveness in seagrass and coral reef fisheries has generally been evaluated at the scale of the fish community. However, community level indicators can mask species-specific declines that provide significant portions of the fisheries yields and income. Using a unique dataset, containing ten years of species level length frequency catch data from a multi-gear, multi-species seagrass and coral reef fishery in Kenya, we evaluate species specific fishery statuses, compare gear use to gear regulations and estimate the potential needs for further gear restrictions. Despite the high diversity of the fishery, fifteen species represented over 90% of the catch, and only three species represented 60% of the catch. The three most abundant species in the catch, Lethrinus lentjan (Lacepède), Siganus sutor (Valenciennes) and Leptoscarus vaigiensis (Quoy & Gaimard) all showed evidence of growth overfishing. Lethrinus lentjan, with an exploitation rate of 0.82, also shows evidence of recruitment overfishing. Current legal but weakly enforced gear restrictions are capable of protecting a significant portion of the catch up to maturity but optimization of yield will require that the current mesh size be increased from 6.3 to 8.8 and 9.2 cm to increase yields of L. lentjan and S. sutor, respectively. Given the difficulties of enforcing mesh size, we recommend that the economic benefits of these larger mesh sizes be communicated and enforced through co-management. This abstract is also available in Kiswahili (Abstract S1).

  2. Assessing gear modifications needed to optimize yields in a heavily exploited, multi-species, seagrass and coral reef fishery.

    Directory of Open Access Journals (Sweden)

    Christina C Hicks

    Full Text Available Effective management is necessary if small-scale fisheries, such as those found in mixed habitats including seagrass and coral reefs, are to continue providing food for many of the poorest communities of the world. Gear-based management, although under represented and under studied, has the potential to be adaptive, address multiple objectives, and be crafted to the socio-economic setting. Management effectiveness in seagrass and coral reef fisheries has generally been evaluated at the scale of the fish community. However, community level indicators can mask species-specific declines that provide significant portions of the fisheries yields and income. Using a unique dataset, containing ten years of species level length frequency catch data from a multi-gear, multi-species seagrass and coral reef fishery in Kenya, we evaluate species specific fishery statuses, compare gear use to gear regulations and estimate the potential needs for further gear restrictions. Despite the high diversity of the fishery, fifteen species represented over 90% of the catch, and only three species represented 60% of the catch. The three most abundant species in the catch, Lethrinus lentjan (Lacepède, Siganus sutor (Valenciennes and Leptoscarus vaigiensis (Quoy & Gaimard all showed evidence of growth overfishing. Lethrinus lentjan, with an exploitation rate of 0.82, also shows evidence of recruitment overfishing. Current legal but weakly enforced gear restrictions are capable of protecting a significant portion of the catch up to maturity but optimization of yield will require that the current mesh size be increased from 6.3 to 8.8 and 9.2 cm to increase yields of L. lentjan and S. sutor, respectively. Given the difficulties of enforcing mesh size, we recommend that the economic benefits of these larger mesh sizes be communicated and enforced through co-management. This abstract is also available in Kiswahili (Abstract S1.

  3. The unionid (Bivalvia) fauna of the Sipsey River in northwestern Alabama, an aquatic hotspot

    Science.gov (United States)

    McCullagh, W. Henry; Williams, James D.; McGregor, Stuart W.; Pierson, J. Malcom; Lydeard, Charles

    2002-01-01

    Recent surveys for unionid bivalves were conducted in the mainstem of the Sipsey River and headwater tributaries (Tombigbee River drainage) during the summer and autumn of 1996-1999. A total of 35 species and 22 genera were found. Museum records from the upper Sipsey, based largely on the efforts of H. H. Smith during 1910-11, raised the total number of recorded unionids in the Sipsey to 42. Smith documented 25 species in the river; however, most of his collections were made in the mid- to upper-Sipsey, which has lower diversity. The three most common recently observed species in descending order of abundance were Quadrula asperata (I. Lea, 1861), Pleurobema decisum (I. Lea, 1831), and Tritogonia verrucosa (Rafinesque, 1820). Federally listed species observed recently include Lampsilis perovalis (Conrad, 1834) (threatened), Medionidus acutissimus (I. Lea, 1831) (threatened), P. decisum (endangered), P. perovatum (Conrad, 1834) (endangered), and Potamilus inflatus (I. Lea, 1831) (threatened). Species not observed recently but recorded in prior surveys include Anodontoides radiatus (Conrad, 1834), Arcidens confragosus (Say, 1829), Plectomerus dombeyanus (Valenciennes, 1827), Q. metanevra (Rafinesque, 1820), Q. stapes (I. Lea, 1831) (federally endangered), P. taitianum (I. Lea, 1834) (federally endangered), and Toxolasma parvus (Barnes, 1823). Many, species are known recently or historically by only five or fewer recorded specimens including: A. radiatus, Elliptio arctata (Conrad, 1834), Ligumia recta (Lamarck, 1819), P. taitianum, P. inflatus, Q. aspera (Lea, 1831), Q. metanevra, Q. stapes, T. parvus, Truncilla donaciformis (I. Lea, 1828), Uniomerus tetralasmus (Say, 1831), Utterbackia imbecillis (Say, 1829), A. confragosus, and P. dombeyanus. Unlike the mussel fauna of most Alabama streams, that of the Sipsey River is still relatively intact in terms of species richness despite impacts from mining, silvicultural, and agricultural activities. A concerted effort

  4. Dose inseminante utilizada na fertilização artificial de ovócito de piracanjuba (Brycon orbignyanus

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    Viviane de Oliveira Felizardo

    2010-10-01

    Full Text Available A piracanjuba (Brycon orbignyanus Valenciennes, 1849 é uma espécie de peixe migratória, ameaçada de extinção. O objetivo do presente estudo foi determinar a dose inseminante na fertilização artificial de ovócitos de piracanjuba. Para isso, utilizou-se delineamento em blocos casualizados, com quatro tratamentos e três repetições. Três casais de piracanjuba, selecionados dos tanques de reprodutores da Estação Ambiental de Itutinga (EAI - CEMIG, no período de piracema 2006/2007, receberam aplicação de hormônio extrato bruto de hipófise de carpa (EBHC para obtenção dos gametas. Adotaram-se quatro tratamentos diferentes para a fertilização de 0,1 grama de ovócitos: 10µL, 20µL, 30µL e 40µL de sêmen. As amostras foram ativadas com 5 mL de água do próprio tanque e, em seguida, levadas para incubadoras, dotadas de renovação constante de água, à temperatura de 28ºC. Após 8 e 16 horas, analisaram-se as taxas de fertilização (ovos viáveis e de eclosão dos ovos, respectivamente. Os resultados obtidos foram comparados pelo teste de Tukey a 5%. As relações sêmen-ovócitos testadas não alteraram as taxas de fertilização e eclosão (P>0,05. O número de espermatozoides-ovócitos, variando de 10,4 x10(5 a 41,6 x10(5, foi eficiente para obtenção de boas taxas de fertilidade.

  5. The cephalic lateral line system of temperate perches (Perciformes: Percichthyidae from Argentinean Patagonia

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    Rocío M. Vega

    Full Text Available ABSTRACT The species of Percichthys (Percichthyidae are endemic to southern South America. Some authors have pointed out that the genus includes four valid species, based on the morphology of the head, jaws, and fins. A phylogenetic analysis published by other authors suggests that three of them are morphotypes belonging to the same species, Percichthys trucha (Valenciennes, 1833. The aim of this study is to describe for the first time the morphology of the cephalic seismosensory system of Patagonian perches, and how these characters vary in the three morphotypes, in order to provide morphological elements to analyze the taxonomy of these fish species. Comparisons of the cephalic seismosensory system between juveniles and adults were also conducted. Juvenile and adult specimens were collected in the northwestern Argentinean Patagonia. Specimens were bleached in 5% H2O2 and the canal systems of their cephalic lateral line were filled with hematoxylin. Specimens were deposited in the Museo Argentino de Ciencias Naturales Bernardino Rivadavia, Argentina. The cephalic lateral line of the studied specimens is a widened type of canal systems, is not connected to the trunk lateral line, and consists of preopercular-mandibular canal, infraorbital canal, supraorbital canal, temporal canal, supratemporal canal, and a supraorbital commisure. The number of pores increases during the ontogeny, while their diameters decrease. The number, position and size of infraorbital canal pores showed significant differences among morphotypes and juveniles. The interpopulation variation regarding the number, position, and size of pores seems to signal an ongoing process of speciation, which is the result adaptations to different environmental conditions. Our study contributes to the knowledge of the morphology of percichthids and describes for the first time the seismosensory system of temperate perches.

  6. Feeding kinematics and performance of Hawaiian stream gobies, Awaous guamensis and Lentipes concolor: linkage of functional morphology and ecology.

    Science.gov (United States)

    Maie, Takashi; Wilson, Megan P; Schoenfuss, Heiko L; Blob, Richard W

    2009-03-01

    Distributions of Hawaiian stream fishes are typically interrupted by waterfalls that divide streams into multiple segments. Larvae hatch upstream, are flushed into the ocean, and must climb these waterfalls to reach adult habitats when returning back to freshwater as part of an amphidromous life cycle. Stream surveys and studies of climbing performance show that Lentipes concolor Gill can reach fast-flowing upper stream segments but that Awaous guamensis Valenciennes reaches only slower, lower stream segments. Gut content analyses for these two species indicate considerable overlap in diet, suggesting that feeding kinematics and performance of these two species might be comparable. Alternatively, feeding kinematics and performance of these species might be expected to differ in relation to the different flow regimes in their habitat (feeding in faster stream currents for L. concolor versus in slower currents for A. guamensis). To test these alternative hypotheses, we compared food capturing kinematics and performance during suction feeding behaviors of A. guamensis and L. concolor using morphological data and high-speed video. Lentipes concolor showed both a significantly larger gape angle and faster jaw opening than A. guamensis. Geometric models calculated that despite the inverse relationship of gape size and suction pressure generation, the fast jaw motions of L. concolor allow it to achieve higher pressure differentials than A. guamensis. Such elevated suction pressure would enhance the ability of L. concolor to successfully capture food in the fast stream reaches it typically inhabits. Differences in jaw morphology may contribute to these differences in performance, as the lever ratio for jaw opening is about 10% lower in L. concolor compared with A. guamensis, suiting the jaws of L. concolor better for fast opening. Copyright 2008 Wiley-Liss, Inc.

  7. Limnología e ictiofauna de la laguna José María (Córdoba, Argentina, con especial referencia al pejerrey (Odontesthes bonariensis -Valenciennes, 1835-

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    M. Mancini

    2016-09-01

    Full Text Available La región sur de la provincia de Córdoba presenta numerosas lagunas cuyo origen y salinidad varían ampliamente. Muchos de estos ambientes son utilizados para la pesca recreativa del pejerrey (Odontesthes bonariensis. El objetivo del presente trabajo fue caracterizar la calidad del agua y determinar la diversidad del zooplancton y de la ictiofauna con especial referencia a O. bonariensis, de la laguna José María (34º50’17’’S, 63º37’23’’O. Este ambiente se ubica en la cuenca del río Quinto (Córdoba y está comunicado con numerosas lagunas. Se analizaron in situ (n=8, el pH, el oxígeno, la temperatura y transparencia del agua y se tomaron muestras de agua y zooplancton para su análisis en laboratorio. Para la captura de peces se utilizaron redes de enmalle, arrastre, trampa y espineles. La profundidad promedio fue de 1,99 m, con un máximo de 2,20 m. Los registros medios del pH, oxígeno disuelto, temperatura y transparencia fueron 8,51, 9,03 mg/L, 24,3 ºC y 44 cm respectivamente. Por su transparencia, la laguna fue caracterizada como “turbia”. El agua se clasificó como oligohalina (4,09 g/L, sulfatada-sódica y muy dura (484 ppm de CO3Ca. El zooplancton estuvo representado por 3 especies de crustáceos y 7 de rotíferos. Entre los primeros, Metacyclops mendocinus fue el que registró la mayor densidad (162,2 ind/L, mientras que entre los rotíferos fue Brachionus plicatilis con 482,7 ind/L. Se capturaron 12 especies de peces, pertenecientes a 5 órdenes y 9 familias (Shannon = 2,23 bits. El pejerrey fue la especie de mayor abundancia (50,8% y junto al sabalito Cyphocharax voga y la carpa Cyprinus carpio representaron el 85 % del total de biomasa de los peces capturados. Los parámetros poblacionales de O. bonariensis fueron: Peso= 0,0000047081*LEst3,178 (R2=0,99, n=116; longitud total= 5,854+LEst*1,168 (R2= 0,99, n= 117; LEst(t= 489,02 (1-e-0,225(t-0,46 y W(t= 1647,5 (1- e-0,225(t-0,463,177.

  8. Dentirumai philippinensis n. gen., n. sp (Nematoda: Philometridae), a new tissue-infecting philometrid nematode from the loach goby Rhyacichthys aspro (Valenciennes) (Rhyacichthyidae) in the Philippines

    Czech Academy of Sciences Publication Activity Database

    Quiazon, K.M.A.; Moravec, František

    2013-01-01

    Roč. 87, č. 1 (2013), s. 59-65 ISSN 0022-149X R&D Projects: GA MŠk LC522 Institutional support: RVO:60077344 Keywords : Philometridae * Phillipine Archipelago * Parasitic nematode Subject RIV: EA - Cell Biology Impact factor: 1.303, year: 2013

  9. Seletividade alimentar de organismos-alimento por formas jovens de pacu Piaractus mesopotamicus (Holmberg, 1887 e curimba Prochilodus lineatus (Valenciennes, 1836 - DOI: 10.4025/actascibiolsci.v29i2.523 Selective feeding of food organisms by fish larvae of Piaractus mesopotamicus (Holmberg, 1887 and Prochilodus lineatus (Valenciennes, 1836 - DOI: 10.4025/actascibiolsci.v29i2.523

    Directory of Open Access Journals (Sweden)

    Carlos Eduardo Bento Fernandes

    2007-12-01

    Full Text Available Objetivou-se avaliar a seleção alimentar de organismos-alimento por formas jovens de pacu (Piaractus mesopotamicus e curimba (Prochilodus lineatus com diferentes idades (6, 12, 19 e 26 dias, na presença e ausência de Pistia stratiotes. Foram utilizados quatro tratamentos (T1 = pacu + P. stratiotes; T2 = pacu; T3 = curimba + P. stratiotes; T4 = curimba e quatro repetições. A cada sete dias, foram coletadas 24 larvas de cada espécie de peixe dos tanques, sendo estas mantidas em jejum por 24 horas. Depois de distribuídas nos aquários com plâncton, as larvas permaneceram por três horas, sendo coletadas e fixadas para análise, juntamente com as amostras de água. Os tratos digestórios das larvas foram retirados e analisados sob microscópio óptico. Observaram-se diferenças estatísticas na seletividade alimentar de organismos planctônicos por larvas de mesma espécie, em diferentes idades e também entre larvas de espécies diferentes, com mesma idade, não diferindo quanto à presença ou ausência de P. stratiotes. As formas jovens de pacu e curimba selecionaram organismos similares aos seis dias de idade, passando por alterações até o 26º dia. À medida que se desenvolveram, as larvas de pacu passaram a selecionar cladóceros e ostrácodos e as de curimba, protozoários e algas.The objective was to evaluate the feeding selection of food organisms for two species of fish larvae (pacu and curimba at different ages (6, 12, 19 and 26 days after eclosion, in the presence or absence of Pistia stratiotes. Four treatments were used (T1 = pacu + P. stratiotes; T2 = pacu; T3 = curimba + P. stratiotes; T4 = curimba and four replications. Every seven days, 24 fish larvae of each species were collected, and kept without food for 24 hours. After being distributed in the aquariums with plankton, the larvae stayed for three hours, and were collected and prepared for analysis, along with the water samples. The digestive tract of the fish larvae were removed and analyzed under an optic microscope. Statistic differences in selective feeding of plankton organisms were reported for larvae of the same species, of different age groups and also among larvae of different species of the same age. There were no observed differences as for the presence or absence of P. stratiotes. The fish larvae of pacu and curimba selected similar organisms at six days old, with changes until the 26th day. As they developed, the pacu larvae began to select cladocerans and ostracods, and the curimba selected protozoans and algae.

  10. Bioacumulation of trace elements in hepatic and renal tissues of the white mullet Mugil curema Valenciennes, 1836 (Actinopterygii, Mugilidae) in two coastal systems in southeastern Brazil

    Science.gov (United States)

    Fernandez, W. S.; Dias, J. F.; Boufleur, L. A.; Amaral, L.; Yoneama, M. L.; Dias, J. F.

    2014-01-01

    The aim of this study is to investigate the presence and the concentration of trace elements in hepatic and renal tissues of white mullet (Mugil curema) by Particle-induced X-ray emission (PIXE). Fish specimens were collected in two coastal areas of São Paulo state-Brazil: the Santos estuary (from March 2009 to February 2010) and the Cananéia-Iguape coastal estuarine system (from May 2008 to April 2009). For the elemental analysis, n = 470 sample tissues (liver and kidney) were pooled according to location and type of organ. Trace elements such as Fe, Cu, Zn and Br were observed in both tissues of M. curema with concentrations ranging from 800 μg g-1 for Fe to 7 μg g-1 for Cu. The concentrations of Cu and Zn showed statistical significant differences among the tissues of M. curema (p < 0.05). Relatively higher concentrations of Cu and Zn were observed in the liver tissue. There was no significantly difference in the elemental concentrations between the two studied areas. The Cu levels in liver tissues of M. curema were found to be above the maximum limits for consumption, according to the United States Environmental Protection Agency (EPA) and Brazilian National Health Surveillance Agency (ANVISA).

  11. Bioacumulation of trace elements in hepatic and renal tissues of the white mullet Mugil curema Valenciennes, 1836 (Actinopterygii, Mugilidae) in two coastal systems in southeastern Brazil

    International Nuclear Information System (INIS)

    Fernandez, W.S.; Dias, J.F.; Boufleur, L.A.; Amaral, L.; Yoneama, M.L.; Dias, J.F.

    2014-01-01

    The aim of this study is to investigate the presence and the concentration of trace elements in hepatic and renal tissues of white mullet (Mugil curema) by Particle-induced X-ray emission (PIXE). Fish specimens were collected in two coastal areas of São Paulo state-Brazil: the Santos estuary (from March 2009 to February 2010) and the Cananéia-Iguape coastal estuarine system (from May 2008 to April 2009). For the elemental analysis, n = 470 sample tissues (liver and kidney) were pooled according to location and type of organ. Trace elements such as Fe, Cu, Zn and Br were observed in both tissues of M. curema with concentrations ranging from 800 μg g −1 for Fe to 7 μg g −1 for Cu. The concentrations of Cu and Zn showed statistical significant differences among the tissues of M. curema (p < 0.05). Relatively higher concentrations of Cu and Zn were observed in the liver tissue. There was no significantly difference in the elemental concentrations between the two studied areas. The Cu levels in liver tissues of M. curema were found to be above the maximum limits for consumption, according to the United States Environmental Protection Agency (EPA) and Brazilian National Health Surveillance Agency (ANVISA)

  12. Effect of anesthetic, tag size, and surgeon experience on postsurgical recovering after implantation of electronic tags in a neotropical fish: Prochilodus lineatus (Valenciennes, 1837 (Characiformes: Prochilodontidae

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    João M. Lopes

    Full Text Available ABSTRACT Implantation of telemetry transmitters in fish can be affected by different parameters. This study aimed to evaluate the effect of type of anesthetic, tag size, and surgeon experience on surgical and postsurgical wound healing in the neotropical fish Prochilodus lineatus . In total, eighty fish were surgically implanted with telemetry transmitters and forty fish were kept as controls. Forty fish were implanted with a small tag and other forty were implanted with a large tag. Similarly, forty fish were anesthetized with eugenol and forty fish were anesthetized by electroanesthesia, and forty surgeries were performed by an expert surgeon and forty surgeries were performed by novice surgeons. At the end of the experimental period seventeen (21.3% tagged fish had postsurgical complications, including death (1.3%, tag expulsion (2.5%, antenna migration (2.5%, and infection (15%. Tag size was the key determinant for postsurgical complications. Surgical details and postsurgical wound healing were not affected by type of anesthetic. Incision size, duration of surgery, and wound area were significantly affected by tag size and surgeon experience, and the number of sutures was significantly affected by tag size only. The results indicate that successful implantation of telemetry transmitters is dependent upon surgeon experience and tag size.

  13. Bioacumulation of trace elements in hepatic and renal tissues of the white mullet Mugil curema Valenciennes, 1836 (Actinopterygii, Mugilidae) in two coastal systems in southeastern Brazil

    Energy Technology Data Exchange (ETDEWEB)

    Fernandez, W.S., E-mail: fernandez@usp.br [Graduate Program in Oceanography, Oceanographic Institute, University of São Paulo, Praça do Oceanográfico 191, Cidade Universitária, CEP 05508-120 São Paulo, SP (Brazil); Physics Institute, Federal University of Rio Grande do Sul, CP 15051, CEP 91501-970 Porto Alegre, RS (Brazil); Dias, J.F. [Oceanographic Institute, University of São Paulo, Praça do Oceanográfico 191, Cidade Universitária, CEP 05508-120 São Paulo, SP (Brazil); Boufleur, L.A.; Amaral, L.; Yoneama, M.L.; Dias, J.F. [Physics Institute, Federal University of Rio Grande do Sul, CP 15051, CEP 91501-970 Porto Alegre, RS (Brazil)

    2014-01-01

    The aim of this study is to investigate the presence and the concentration of trace elements in hepatic and renal tissues of white mullet (Mugil curema) by Particle-induced X-ray emission (PIXE). Fish specimens were collected in two coastal areas of São Paulo state-Brazil: the Santos estuary (from March 2009 to February 2010) and the Cananéia-Iguape coastal estuarine system (from May 2008 to April 2009). For the elemental analysis, n = 470 sample tissues (liver and kidney) were pooled according to location and type of organ. Trace elements such as Fe, Cu, Zn and Br were observed in both tissues of M. curema with concentrations ranging from 800 μg g{sup −1} for Fe to 7 μg g{sup −1} for Cu. The concentrations of Cu and Zn showed statistical significant differences among the tissues of M. curema (p < 0.05). Relatively higher concentrations of Cu and Zn were observed in the liver tissue. There was no significantly difference in the elemental concentrations between the two studied areas. The Cu levels in liver tissues of M. curema were found to be above the maximum limits for consumption, according to the United States Environmental Protection Agency (EPA) and Brazilian National Health Surveillance Agency (ANVISA)

  14. Acetylcholinesterase enzyme activity in carp brain and muscle after acute exposure to diafuran Atividade da enzima acetilcolinesterase em cérebro e músculo de carpas após exposição aguda ao diafuran

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    Jaqueline Ineu Golombieski

    2008-01-01

    Full Text Available Sublethal adverse effects may result from exposure of aquatic organisms to insecticides at environmentally relevant concentrations. Fingerlings of the common carp (Cyprinus carpio, Linnaeus, 1758, grass carp (Ctenopharyngodon idella, Valenciennes, 1844, and bighead carp (Aristichthys nobilis, Richardson, 1845 were exposed to diafuran, an insecticide widely used during rice cultivation in Southern Brazil. The aim of this study was to verify the relationship between the lethal concentration (LC50 of diafuran and the acetylcholinesterase (AChE activity in brain and muscle tissues of these species as a possible early biomarker of exposure to this insecticide. LC50 was determined for fish exposed to diafuran concentrations during 96 h (short term: common carp: control, 0.5, 1.0, 1.5, 2.0, 2.5 and 3.0 mg L-1; grass carp: control, 1.0, 2.0, 3.0 and 3.5 mg L-1 and, bighead carp: control, 0.5, 1.0, 1.5, 2.0, 3.0 and 4.0 mg L-1, as well as the determination of AChE at concentrations near LC50 for these species. LC50 values (nominal concentrations were 1.81 mg L-1 for the common carp, 2.71 mg L-1 for the grass carp and, 2.37 mg L-1 for the bighead carp. All carps exposed to diafuran were lethargic (lower concentrations or immobile. Diafuran inhibited the acetylcholinesterase activity in brain (~38% and muscle (~50% of all species. Muscle of bighead carp under control treatment showed higher specific AChE activity than brain (14.44 against 5.94 µmol min-1 g protein-1, respectively. Concentrations of diafuran used for rice cropping may affect Cyprinus carpio, Ctenopharyngodon idella and Aristichthys nobilis behaviors and the AChE activities in brain and muscle of these species may be an early biomarker of toxicity of this insecticide.Exposição a inseticidas em concentrações elevadas no ambiente podem ocasionar efeitos adversos subletais em organismos aquáticos. Alevinos de carpa húngara (Cyprinus carpio, Linnaeus, 1758, carpa capim (Ctenopharyngodon

  15. Datça-Bozburun Yarımadası (Ege Denizi Kıyı Balıkçılığı ve Sorunları Üzerine Bir Araştırma.

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    Okan Akyol

    2015-12-01

    Full Text Available Bu çalışmada, Datça-Bozburun Yarımadası’nın kıyı balıkçılık aktiviteleri, hedef balık türleri, balıkçılık sorunları, balıkçı kooperatiflerinin özellikleri, balıkçı tekneleri ve barınakları araştırılmıştır. Örneklemeler iki balıkçı kooperatifi (Datça ve Karaköy ve 8 balıkçılık barınağında 2005-2006 yılları arasında yürütülmüştür. Bölgede toplam 32 kooperatif üyesi ile yaklaşık 170 balıkçı teknesi kaydedilmiştir. Üye sayılarına göre en büyük balıkçı kooperatifi Datça’dır. Bölgede kıyı balıkçılığı yoğun olarak paragat, sade ve fanyalı uzatma ağlarıyla yürütülmektedir. Uzatma ağı ve paragat balıkçılığında yakalanan balık ve omurgasızlar Ege ve Akdeniz’in yerleşik tipik balıklarıdır. Mullus barbatus, Sphyraena sphyraena, Seriola dumerilii, Pagellus erythrinus, Dentex dentex, Mullus surmuletus, Sarda sarda, Xiphias gladius, Epinephelus aeneus, Loligo vulgaris, Octopus vulgaris vb. ticari avdaki hedef türlerdir. Fakat bölgedeki balıkçılık aktiviteleri kısa balıkçılık sezonu, düşük balıkçılık kapasitesi ve az sayıdaki balıkçı nedeniyle göreceli olarak oldukça zayıf bulunmuştur

  16. Prevalence of pansteatitis in African sharptooth catfish, Clarias gariepinus (Burchell), in the Kruger National Park, South Africa.

    Science.gov (United States)

    Huchzermeyer, K David A

    2012-11-09

    Pansteatitis was confirmed in sharptooth catfish, Clarias gariepinus (Burchell), from three main locations within the Kruger National Park (KNP); the Olifants River Gorge, Engelhard Dam on the Letaba River and from the Sabie River in the Sabiepoort. An increasing prevalence of pansteatitis was observed in catfish during repeated samplings from the Olifants Gorge from 2009 to 2011 and co-existence of old and recent lesions indicated on-going incitement of pansteatitis. Only a low prevalence of pansteatitis was observed in catfish sampled from the Olifants River upstream of the Gorge in the KNP and no pansteatitis was observed in catfish sampled from a rain-filled dam not connected to the Olifants River. Common to both the Olifants Gorge and the Sabiepoort is the damming of the rivers in Mozambique to form lakes Massingir and Corumana respectively. Anthropogenic activities resulting in potential pollution of the rivers differ greatly between these two catchments, providing argument against a primary pollution-related aetiology of the pansteatitis found at these two sites. Compared with other sites, analysis of stomach contents of catfish from the Olifants Gorge and the Sabiepoort strongly suggested that consumption of a predominantly fish diet was associated with the development of pansteatitis in these fish. In a farmed population of catfish used as positive control, development of pansteatitis could be ascribed to consumption of rancid fish waste from a trout slaughterhouse. In the Olifants Gorge, alien invasive silver carp, Hypophthalmychthys molitrix (Valenciennes), seasonally migrate upstream out of Lake Massingir to spawn. This schooling species is an obligate phytoplankton feeder with consequent high levels of adipose tissue n-3 polyunsaturated fatty acids. In the Olifants Gorge, at least, this may explain seasonal exposure to levels of polyunsaturated fats in the diets of catfish and crocodiles to which these animals are not adapted. The possible roles of

  17. Prevalence of pansteatitis in African sharptooth catfish, Clarias gariepinus (Burchell, in the Kruger National Park, South Africa

    Directory of Open Access Journals (Sweden)

    K. David A. Huchzermeyer

    2012-04-01

    Full Text Available Pansteatitis was confirmed in sharptooth catfish, Clarias gariepinus (Burchell, from three main locations within the Kruger National Park (KNP; the Olifants River Gorge, Engelhard Dam on the Letaba River and from the Sabie River in the Sabiepoort. An increasing prevalence of pansteatitis was observed in catfish during repeated samplings from the Olifants Gorge from 2009 to 2011 and co-existence of old and recent lesions indicated on-going incitement of pansteatitis. Only a low prevalence of pansteatitis was observed in catfish sampled from the Olifants River upstream of the Gorge in the KNP and no pansteatitis was observed in catfish sampled from a rain-filled dam not connected to the Olifants River. Common to both the Olifants Gorge and the Sabiepoort is the damming of the rivers in Mozambique to form lakes Massingir and Corumana respectively. Anthropogenic activities resulting in potential pollution of the rivers differ greatly between these two catchments, providing argument against a primary pollution-related aetiology of the pansteatitis found at these two sites. Compared with other sites, analysis of stomach contents of catfish from the Olifants Gorge and the Sabiepoort strongly suggested that consumption of a predominantly fish diet was associated with the development of pansteatitis in these fish. In a farmed population of catfish used as positive control, development of pansteatitis could be ascribed to consumption of rancid fish waste from a trout slaughterhouse. In the Olifants Gorge, alien invasive silver carp, Hypophthalmychthys molitrix (Valenciennes, seasonally migrate upstream out of Lake Massingir to spawn. This schooling species is an obligate phytoplankton feeder with consequent high levels of adipose tissue n-3 polyunsaturated fatty acids. In the Olifants Gorge, at least, this may explain seasonal exposure to levels of polyunsaturated fats in the diets of catfish and crocodiles to which these animals are not adapted. The

  18. Prevalence of pansteatitis in African sharptooth catfish, Clarias gariepinus (Burchell, in the Kruger National Park, South Africa

    Directory of Open Access Journals (Sweden)

    K. David A. Huchzermeyer

    2012-11-01

    Full Text Available Pansteatitis was confirmed in sharptooth catfish, Clarias gariepinus (Burchell, from three main locations within the Kruger National Park (KNP; the Olifants River Gorge, Engelhard Dam on the Letaba River and from the Sabie River in the Sabiepoort. An increasing prevalence of pansteatitis was observed in catfish during repeated samplings from the Olifants Gorge from 2009 to 2011 and co-existence of old and recent lesions indicated on-going incitement of pansteatitis. Only a low prevalence of pansteatitis was observed in catfish sampled from the Olifants River upstream of the Gorge in the KNP and no pansteatitis was observed in catfish sampled from a rain-filled dam not connected to the Olifants River. Common to both the Olifants Gorge and the Sabiepoort is the damming of the rivers in Mozambique to form lakes Massingir and Corumana respectively. Anthropogenic activities resulting in potential pollution of the rivers differ greatly between these two catchments, providing argument against a primary pollution-related aetiology of the pansteatitis found at these two sites. Compared with other sites, analysis of stomach contents of catfish from the Olifants Gorge and the Sabiepoort strongly suggested that consumption of a predominantly fish diet was associated with the development of pansteatitis in these fish. In a farmed population of catfish used as positive control, development of pansteatitis could be ascribed to consumption of rancid fish waste from a trout slaughterhouse. In the Olifants Gorge, alien invasive silver carp, Hypophthalmychthys molitrix (Valenciennes, seasonally migrate upstream out of Lake Massingir to spawn. This schooling species is an obligate phytoplankton feeder with consequent high levels of adipose tissue n-3 polyunsaturated fatty acids. In the Olifants Gorge, at least, this may explain seasonal exposure to levels of polyunsaturated fats in the diets of catfish and crocodiles to which these animals are not adapted. The

  19. Karyotypic diversity in four species of the genus Gymnotus Linnaeus, 1758 (Teleostei, Gymnotiformes, Gymnotidae): physical mapping of ribosomal genes and telomeric sequences

    Science.gov (United States)

    Scacchetti, Priscilla Cardim; Pansonato-Alves, José Carlos; Utsunomia, Ricardo; Oliveira, Claudio; Foresti, Fausto

    2011-01-01

    Abstract Conventional (Giemsa, C-Banding, Ag-NORs, CMA3) and molecular (5S rDNA, 18S rDNA, telomeric sequences) cytogenetic studies were carried out in specimens of ten distinct fish populations of the genus Gymnotus (Gymnotus sylvius Albert and Fernandes-Matioli, 1999, Gymnotus inaequilabiatus Valenciennes, 1839, Gymnotus pantherinus Steindachner, 1908, and G. cf. carapo Linnaeus, 1758) from different Brazilian hydrographic basins. Gymnotus sylvius presented a diploid number of 40 chromosomes (22m+12sm+6st), Gymnotus pantherinus presented 52 chromosomes (32m+18sm+2st), while Gymnotus inaequilabiatus (42m+10sm+2a)and Gymnotus cf. carapo (38m+12sm+4st) presented 54 chromosomes. The C-banding technique revealed centromeric marks in all chromosomes of all species. Besides that, conspicuous blocks of heterochromatin were found interstitially on the chromosomes of Gymnotus inaequilabiatus, Gymnotus cf. carapo,and Gymnotus pantherinus. All four species showed single nucleolus organizing regions confirmed by results obtained through Ag-NORs and FISH experiments using 18S rDNA probes, which showed the NORs localized on the first chromosome pair in Gymnotus inaequilabiatus, Gymnotus cf. carapo,and Gymnotus pantherinus, and on pair 2 in Gymnotus sylvius. CMA3 staining revealed additional unrelated NORs marks in Gymnotus sylvius and Gymnotus pantherinus. The 5S rDNA probes revealed signals on one pair in Gymnotus sylvius and two pairs in Gymnotus pantherinus; Gymnotus inaequilabiatus had about seventeen pairs marked, and Gymnotus cf. carapo had about fifteen pairs marked. It is considered that the high amount of heterochromatin identified in the chromosomes of Gymnotus inaequilabiatus and Gymnotus cf. carapo could have facilitated the dispersion of 5S rDNA in these species. Interstitial signals were detected on the first metacentric pair of Gymnotus sylvius by telomeric probes (TTAGGG)n indicating the possible occurrence of chromosomal fusions in this species. The present

  20. Karyotypic diversity in four species of the genus Gymnotus Linnaeus, 1758 (Teleostei, Gymnotiformes, Gymnotidae: physical mapping of ribosomal genes and telomeric sequences

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    Priscilla Scacchetti

    2011-08-01

    Full Text Available Conventional (Giemsa, C-Banding, Ag-NORs, CMA3 and molecular (5S rDNA, 18S rDNA, telomeric sequences cytogenetic studies were carried out in specimens of ten distinct fish populations of the genus Gymnotus (G. sylvius Albert and Fernandes-Matioli, 1999, G. inaequilabiatus Valenciennes, 1839, G. pantherinus Steindachner, 1908, and G. cf. carapo Linnaeus, 1758 from different Brazilian hydrographic basins. G. sylvius presented a diploid number of 40 chromosomes (22m+12sm+6st, G. pantherinus presented 52 chromosomes (32m+18sm+2st, while G. inaequilabiatus (42m+10sm+2a and G. cf. carapo (38m+12sm+4st presented 54 chromosomes. The C-banding technique revealed centromeric marks in all chromosomes of all species. Besides that, conspicuous blocks of heterochromatin were found interstitially on the chromosomes of G. inaequilabiatus, G. cf. carapo, and G. pantherinus. All four species showed single nucleolus organizing regions confirmed by results obtained through Ag-NORs and FISH experiments using 18S rDNA probes, which showed the NORs localized on the first chromosome pair in G. inaequilabiatus, G. cf. carapo, and G. pantherinus, and on pair 2 in G. sylvius. CMA3 staining revealed additional unrelated NORs marks in G. sylvius and G. pantherinus. The 5S rDNA probes revealed signals on one pair in G. sylvius and two pairs in G. pantherinus; G. inaequilabiatus had about seventeen pairs marked, and G. cf. carapo had about fifteen pairs marked. It is considered that the high amount of heterochromatin identified in the chromosomes of G. inaequilabiatus and G. cf. carapo could have facilitated the dispersion of 5S rDNA in these species. Interstitial signals were detected on the first metacentric pair of G. sylvius by telomeric probes (TTAGGGn indicating the possible occurrence of chromosomal fusions in this species. The present study reveals valuable cytotaxonomic markers for this group and allows a more precise evaluation of the processes involved in the

  1. Migration of the curimbatá Prochilodus lineatus (Valenciennes, 1836) (Pisces, Prochilodontidae) at the waterfall "Cachoeira de Emas" of the Mogi-Guaçu river--São Paulo, Brazil.

    Science.gov (United States)

    Capeleti, A R; Petrere, M

    2006-05-01

    In this paper, we counted the ascending curimbatás at the fish ladder at the Cachoeira de Emas from October, 1992 to September, 1993 in one whole day (24 h period) per month at different observation points in the dam for 5 min every hour. Most of the fish (80%) were counted not in the fish ladder itself, but in two adjacent spillways at its left, perhaps due to the comparatively increased flow as they are narrower than the ladder. The bulk of the migration occurred in September/October. We inspected the degree of injury of the fish in order to examine the hypothesis that larger fish are less injured, however no conclusion was reached. The degree of injury varied between different points and in different months of the year.

  2. Migration of the curimbatá Prochilodus lineatus (Valenciennes, 1836 (Pisces, Prochilodontidae at the waterfall "Cachoeira de Emas" of the Mogi-Guaçu river - São Paulo, Brazil

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    A. R. Capeleti

    Full Text Available In this paper, we counted the ascending curimbatás at the fish ladder at the Cachoeira de Emas from October, 1992 to September, 1993 in one whole day (24 h period per month at different observation points in the dam for 5 min every hour. Most of the fish (80% were counted not in the fish ladder itself, but in two adjacent spillways at its left, perhaps due to the comparatively increased flow as they are narrower than the ladder. The bulk of the migration occurred in September/October. We inspected the degree of injury of the fish in order to examine the hypothesis that larger fish are less injured, however no conclusion was reached. The degree of injury varied between different points and in different months of the year.

  3. The Sternoptychidae (Pisces, Stomiatoidei) of the Amsterdam Mid North Atlantic Plankton Expedition 1980, with a note on specimens intermediate between Argyropelecus aculeatus Valenciennes, 1849 and A. olfersi (Cuvier, 1829)

    NARCIS (Netherlands)

    Pafort-Van Iersel, Trudie

    1981-01-01

    The Sternoptychidae caught during a spring expedition in the Mid North Atlantic in 1980 are studied. Distribution patterns and data on abundance are recorded. It is proposed that Argyropelecus aculeatus and A. olfersi are two formae belonging to one species, the existing phenotypical differences

  4. [Detection of the mitochondrial DNA haplotype characteristic of the least cisco (Coregonus sardinella, Valenciennes, 1848) in the vendace (C. albula, Linnaeus, 1758) population of Vodlozero (the Baltic Sea basin)].

    Science.gov (United States)

    Borovikova, E A; Makhrov, A A

    2009-01-01

    Analysis of the nucleotide sequence of the mitochondrial ND-1 gene in the vendace population in lake Vodlozero (the eastern part of the Baltic Sea basin) revealed a sequence variant that is closely related to that of the least cisco of Siberia (the Indigirka River). Thus, together with the results of morphological and allozyme analysis of this population performed earlier, the results obtained in this study are suggestive of the immigration of the least cisco to the Baltic Sea basin during the last glaciation.

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

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    Julia Vergara

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

  6. Variables ambientales y abundancia de los huevos de Anchoa mitchilli (Pisces: Engraulidae en la laguna de Tamiahua, México

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    Carlos Díaz-Avalos

    2003-06-01

    Full Text Available Se estudió la abundancia de huevos de Anchoa mitchilli (Cuvier y Valenciennes 1848 en la laguna de Tamiahua, Ver. durante tres ciclos anuales (84-85, 85-86 y 86-87, para determinar zonas y épocas de alta concentración de huevos y su posible asociación con variables como temperatura, salinidad, transparencia y profundidad, así como con factores espacio-temporales como posición geográfica, época climática y el ciclo anual de recolecta. Para probar estadísticamente la asociación de la abundancia de huevos con dichos factores y variables se ajusto un Modelo Lineal Generalizado (MLG con error tipo Gamma. Los resultados del modelo ajustado sugieren que no todas las variables tienen un efecto significativo sobre la abundancia de huevos (t de Student, p >0.05. Las variables que resultaron estadísticamente significativas indican la presencia de un componente estacional y que la salinidad tiene un efecto condicional a la localidad. Las mayores abundancias promedio durante los tres ciclos de recolecta ocurrieron siempre durante el verano. Asimismo, debido a la presencia de interacciones significativas (t de Student, pEgg abundance of Anchoa mitchilli was studied in Laguna de Tamiahua, Veracruz during three annual cycles (84-85, 85-86 and 86-87. Our goal was to detect areas and seasons with high egg abundance and the possible association of such areas and seasons with covariates such as temperature, salinity, transparency, depth, location, season and year. The association was tested statistically using a Generalized Linear Model (GLM with Gamma type error. The results suggest that not all the covariates considered have a significant effect on egg abundance (Student’s T, p>0.005. The significant effects show the presence of a seasonal component and that the effect of salinity on egg abundance is conditional to location. High average egg abundances for the three annual cycles were observed during summer. The presence of significant interactions

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

    Science.gov (United States)

    Vieira, Fabiano M; Pereira, Felipe B; Pantoja, Camila; Soares, Iris A; Pereira, Aldenice N; Timi, Juan T; Scholz, Tomáš; Luque, José L

    2015-11-05

    A taxonomic survey of six nematode species (including three new taxa) from the genus Cucullanus Müller, 1777, parasites of marine fishes off the Brazilian coast, is provided. Nematodes were studied using light and scanning electron microscopy (SEM). Cucullanus gastrophysi n. sp. parasitic in Lophius gastrophysus Miranda Ribeiro differs from its congeners by the combination of the following features: shape and number of sclerotized structures in the oesophastome (a pair of lateral elongate structures and a single small reniform one), position of deirids and excretory pore (both anterior to oesophagus base), spicule length and spicule/body length ratio (0.97-1.29 mm and 6.5-10.5%, respectively), morphology and length of gubernaculum (V-shaped, 107-135 µm long). Cucullanus protrudens n. sp. from Pagrus pagrus (Linnaeus) has the cloacal lips broadly protruded, which differentiates it from several species of Cucullanus; other features, e.g., the length of spicules and gubernaculum (400-415 µm and 91-103 µm, respectively), arrangement of caudal papillae and position of excretory pore (slightly posterior to oesophagus-intestine junction) also characterize this species. Cucullanus pseudopercis n. sp. from Pseudopercis semifasciata (Cuvier) has deirids and excretory pore posterior to the oesophagus-intestine junction, which distinguishes the species from most of the congeners; furthermore, the arrangement of caudal papillae in combination with the length of spicules and gubernaculum (1.0-1.5 mm and 178-196 µm, respectively) separate this species from other taxa. Newly collected specimens of C. cirratus Müller, 1777 (type species of the genus) from Urophycis brasiliensis (Kaup), C. pedroi from Conger orbignianus Valenciennes (type host of the species) and C. genypteri Sardella, Navone & Timi, 1997 from Genypterus brasiliensis Regan, were studied as well. Comparisons between newly collected samples and the taxonomic data available for each respective species revealed

  8. Characterization of ichthyoplankton within the U.S. Geological Survey's Northeastern Gulf of Mexico study area - based on analysis of Southeast Area Monitoring and Assessment Program (SEAMAP) Sampling Surveys, 1982-1999. NEGOM ichthyoplankton synopsis final report

    Science.gov (United States)

    Lyczkowski-Shultz, Joanne; Hanisko, David S.; Sulak, Kenneth J.; Dennis, George D.

    2004-01-01

    This synthesis was undertaken to characterize the occurrence and abundance of fish eggs and larvae in the northeastern Gulf of Mexico (NEGOM) and to assess the region's relative importance in the early life history of fishes as compared to the entire U.S. Gulf of Mexico. Data for 66 selected taxa from 1,166 bongo and neuston net samples at 72 localities [comprising the UGSG NEGOM Ichthyoplankton Synopsis (UNIS) Study Area] were analyzed. These data were taken during annual Southeast Area Monitoring and Assessment Program (SEAMAP) gulfwide surveys from 1982-1999, and were summarized by the NMFS to accomplish this objective. Comparison of the UNIS Study Area with the overall SEAMAP survey area revealed that the larvae of 16 taxa occurred more frequently and were relatively more abundant in the UNIS Study Area than the entire SEAMAP survey area while for other taxa occurrence and relative abundance were comparable. These taxa represented fishes from mesopelagic, continental shelf, and reef assemblages reflecting the wide diversity of habitats available in the NEGOM and included the young of two important resource taxa, Rhomboplites aurorubens (vermilion snapper) and Seriola spp. (amberjacks). Distinct distribution patterns were observed among larvae in the UNIS Study Area that appear to be associated with the presence of the DeSoto Canyon. One notable pattern was the predominance of certain taxa to either the west or east of longitude 86.5-87.0o W. Larvae of several characteristic reef-fish families were most common to the east of this apparent zoogeographic faunal discontinuity. An alternative pattern was seen among taxa whose larvae occurred primarily at locations over depth contours outlining the canyon. Additionally, the UNIS Study Area contributed more fish eggs, total larvae, and zooplankton to survey totals than would be expected from the number of samples taken in the study area. This pattern was more evident during spring than fall surveys. It may relate to

  9. ESTUDO DA VIABILIDADE DO ÓLEO DE VÍSCERAS DE PEIXES MARINHOS (Seriola Dumerlii (ARABAIANA), Thunnus ssp (ATUM), Scomberomorus cavala (CAVALA) e Carcharrhinus spp (CAÇÃO)) COMERCIALIZADOS EM ARACAJU-SE PARA A PRODUÇÃO DE BIODIESEL

    OpenAIRE

    Carla Crislan Bery

    2012-01-01

    O pescado e seus produtos são reconhecidamente importantes alternativas alimentares para a população humana, representam fontes de proteínas de alta qualidade e boa digestibilidade, lipídios, minerais, ácidos graxos e vitaminas lipossolúveis. A indústria de pescado representa um vasto potencial quanto ao volume de resíduo gerado, pois seus descartes podem ser transformados em produtos com aproveitamento mercadológico como exemplo disso as silagem, farinhas, óleos de peixe, biodiesel, produtos...

  10. ESTUDO DA VIABILIDADE DO ÓLEO DE VÍSCERAS DE PEIXES MARINHOS (Seriola Dumerlii (ARABAIANA, Thunnus ssp (ATUM, Scomberomorus cavala (CAVALA e Carcharrhinus spp (CAÇÃO COMERCIALIZADOS EM ARACAJU-SE PARA A PRODUÇÃO DE BIODIESEL

    Directory of Open Access Journals (Sweden)

    Carla Crislan Bery

    2012-09-01

    Full Text Available O pescado e seus produtos são reconhecidamente importantes alternativas alimentares para a população humana, representam fontes de proteínas de alta qualidade e boa digestibilidade, lipídios, minerais, ácidos graxos e vitaminas lipossolúveis. A indústria de pescado representa um vasto potencial quanto ao volume de resíduo gerado, pois seus descartes podem ser transformados em produtos com aproveitamento mercadológico como exemplo disso as silagem, farinhas, óleos de peixe, biodiesel, produtos fermentados entre outros. Óleos provenientes de gordura animal e os usados para cocção de alimentos são utilizados como fonte de matéria prima alternativa para a produção de biocombustíveis, porém os óleos cuja origem vem dos resíduos orgânicos descartados por indústrias beneficiadoras de pescado estão sendo estudados como forma de reaproveitamento destes maximizando a utilização da matéria prima evitando desperdício e caminhando assim, para um desenvolvimento sustentável. Devido a falta de conhecimento sobre o potencial destes resíduos e a busca por matérias primas alternativas para melhorar a produção energética, o objetivo deste trabalho foi verificar a viabilidade do óleo extraído a partir das vísceras de peixes marinho para produção de biodiesel. Analisou-se a caracterização das vísceras de peixes marinhos e análises para determinar os teores de acidez, iodo e umidade, a viscosidade cinemática, o índice de saponificação e a densidade do óleo. Observou-se que as vísceras de peixes marinho apresentaram alto teor lipídico e proteico e o óleo extraído das vísceras de peixe marinho é uma alternativa como matéria prima para a produção de biodiesel.Palavras-chave: vísceras, peixe marinho, óleo, biodiesel.

  11. PREPARATION AND APPLICATIONS OF MONOCLONAL ANTIBODY AGAINST THE PATHOGENIC HARVEYI FROM PSEUDOSCIAENA CROCEA%大黄鱼病原哈维氏弧菌单克隆抗体的制备及其应用

    Institute of Scientific and Technical Information of China (English)

    郝贵杰; 沈锦玉; 徐洋; 姚嘉赟; 潘晓艺; 尹文林

    2009-01-01

    用甲醛灭活哈维氏弧菌(Vibrio harveyi)GYC1108-1制备免疫原免疫8周龄雌性BALB/c小鼠,利用淋巴细胞杂交瘤技术,用间接酶联免疫吸附试验(ELISA)对杂交瘤进行筛选,阳性克隆经2-3次亚克隆后,共获得5株针对GYC1108-1的单克隆抗体.选取1B7制备小鼠腹水抗体,其细胞上清及腹水效价分别为1∶3200和1∶32000.同样用灭活的哈维氏弧菌免疫新西兰大白兔,5次免疫后颈动脉采血,离心取血清,并用饱和硫酸铵法进行纯化,制备了兔抗哈维氏弧菌多克隆抗体,其ELISA效价为1∶51200.利用1B7单克隆抗体和兔抗哈维氏弧菌多克隆抗体以及山羊抗小鼠HRP酶标二抗,建立了检测哈维氏弧菌的三抗体夹心酶联免疫吸附试验(TAS-ELISA)方法.该方法对哈维氏弧菌的最小检出浓度为1×104个/mL.用该TAS-ELISA方法检测大黄鱼(Pseudosciaena crocea)样品,54尾患病大黄鱼中有45尾检出哈维氏弧菌,而14尾健康大黄鱼都没有检出哈维氏弧菌.由此可见,本试验建立的TAS-ELISA方法,可以用于患病大黄鱼哈维氏弧菌的快速诊断.%Vibrio harveyi is a kind of important pathogenic bacteria for seawater animals, such as prawn, crab, calm and ormer. Along with the development of seawater fish cage-culture in China, Vibrio harveyi also becomes a main cause of disease of cage-culture fish, including Lutianus erythopterus, Seriola dumerili , Epinephelus coioides and Pseudosciaena cro-cea. One pathogenic V. harveyi strain, GYC1108-1, which was isolated from diseased Pseudosciaena crocea in Zhejiang Province, 2003, was identified after morphological observation, biochemical characteristic analysis, 16sRNA and HSP60 gene sequence detection.

  12. A review of the genus Pempheris (Perciformes, Pempheridae) of the Red Sea, with description of a new species.

    Science.gov (United States)

    Koeda, Keita; Yoshino, Tetsuo; Imai, Hideyuki; Tachihara, Katsunori

    2014-04-30

    Four species of the fish genus Pempheris are recognized for the Red Sea: P. adusta Bleeker, 1877; P. mangula Cuvier, 1829; P. nesogallica Cuvier in Cuvier & Valenciennes, 1831; and a new species P. tominagai. All are wide-ranging in the western Indian Ocean, and P. mangula has migrated via the Suez Canal to the eastern Mediterranean Sea. Morphological and genetic analysis of 15 species in this genus show that P. adusta, a widely distributed species, that can't be divided into different species, because of the continuity of morphologies and distribution, and lack of variance in genetics between Indian Ocean, Red Sea, and Pacific Ocean populations. This confirms that the two subspecies described by Randall et al. (2013) are both synonyms of P. adusta. Pempheris adusta is distinguished from other species by a blackish spot on pectoral fin base, pored lateral-line scales 56-64, scale rows above lateral line 4 1/2-6 1/2, distinct blackish band on outer edge of anal fin, and blackish band on posterior edge of caudal fin. Pempheris mangula was named by Cuvier (1829) in a footnote making reference to a drawing and short description in Russell (1803) of a Pempheris from southeast India, giving only the native name ''Mangula-Kutti'', and listing no specimen. The wide distribution of this species, from the Indian Ocean to the Red Sea is also demonstrated by morphological and genetic analysis. Thus, the specimen collected from southern India is herein designated as the neotype. This species is distinguished from other species by its huge eye, deep body, blackish tip of the dorsal fin, pored lateral-line scales 49-60, and scale rows above lateral line 4 1/2-5 1/2. The extant syntype of Kossmann & Räuber's P. rhomboidea is designated as the lectotype of the species; however, P. rhomboidea is a synonym of P. mangula. In addition, Kossmann & Räuber's Pempheris erythraea and P. russellii Day, 1888 are also synonyms of P. mangula. Of two existing syntypes of P. nesogallica from

  13. Monogenean anchor morphometry: systematic value, phylogenetic signal, and evolution

    Science.gov (United States)

    Soo, Oi Yoon Michelle; Tan, Wooi Boon; Lim, Lee Hong Susan

    2016-01-01

    Background. Anchors are one of the important attachment appendages for monogenean parasites. Common descent and evolutionary processes have left their mark on anchor morphometry, in the form of patterns of shape and size variation useful for systematic and evolutionary studies. When combined with morphological and molecular data, analysis of anchor morphometry can potentially answer a wide range of biological questions. Materials and Methods. We used data from anchor morphometry, body size and morphology of 13 Ligophorus (Monogenea: Ancyrocephalidae) species infecting two marine mugilid (Teleostei: Mugilidae) fish hosts: Moolgarda buchanani (Bleeker) and Liza subviridis (Valenciennes) from Malaysia. Anchor shape and size data (n = 530) were generated using methods of geometric morphometrics. We used 28S rRNA, 18S rRNA, and ITS1 sequence data to infer a maximum likelihood phylogeny. We discriminated species using principal component and cluster analysis of shape data. Adams’s Kmult was used to detect phylogenetic signal in anchor shape. Phylogeny-correlated size and shape changes were investigated using continuous character mapping and directional statistics, respectively. We assessed morphological constraints in anchor morphometry using phylogenetic regression of anchor shape against body size and anchor size. Anchor morphological integration was studied using partial least squares method. The association between copulatory organ morphology and anchor shape and size in phylomorphospace was used to test the Rohde-Hobbs hypothesis. We created monogeneaGM, a new R package that integrates analyses of monogenean anchor geometric morphometric data with morphological and phylogenetic data. Results. We discriminated 12 of the 13 Ligophorus species using anchor shape data. Significant phylogenetic signal was detected in anchor shape. Thus, we discovered new morphological characters based on anchor shaft shape, the length between the inner root point and the outer root

  14. Alimentação de juvenis de carpa capim com dietas à base de farelos vegetais e forragem = Feeding grass carp juveniles with plant-protein diets and forage

    Directory of Open Access Journals (Sweden)

    Cátia Aline Veiverberg

    2010-07-01

    Full Text Available Para avaliar o potencial dos ingredientes de origem vegetal como substitutos da farinha de carne suína em dietas para Ctenopharyngodon idella Valenciennes, (1844 (carpa capim, 180 juvenis (15 por tanque foram criados durante 60 dias em sistema de recirculação de água. Foi avaliada a substituição da farinha de carne suína (FCS por farelo de canola (FC, farelo de girassol (FG e a mistura dos farelos de canola e girassol (FCG. As dietas também continham farelo de soja como fonte proteica. O consumo diário de forragem (1,24 a 2,11% do peso vivo não diferiu entre os tratamentos. Peso final, ganho em peso, taxa de crescimento específico e conversão alimentar aparente não diferiram estatisticamente entre as dietas. O rendimento de filé foi maior nos tratamentos FC e FCG, enquanto o índice digestivossomático foi maior nos tratamentos FG e FCG. Maior teor degordura e menores teores de proteína no peixe inteiro e de cinzas no filé foram obtidos no tratamento FCG. Os filés dos tratamentos FCS e FCG apresentaram maior valor de luminosidade. Os peixes da dieta FCS apresentaram maiores valores de proteínas, triglicerídeos e colesterol total no soro. Conclui-se que os farelos de canola e girassol podem ser utilizados em dietas para recria da carpa capim.To evaluate the potential of plant-protein sources to replace porcine meat meal in diets for grass carp juveniles, 180 fish (15 per tank were reared for 60 days in a re-use water system. We evaluated the replacement of porcine meat meal (FCS for canola meal (FC, sunflowermeal (FG or a mixture of canola and sunflower meal (FCG. The diets were also composed of soybean meal as a protein source. Daily forage intake ranged from 1.24 to 2.11% body weight and did not differ among treatments. Final weight, weight gain, specific growth rate and feed conversion rate did not differ statistically among diets. The fillet yield was higher in FC and FCG diets, while the digestive-somatic index was higher

  15. Alimentação de juvenis de carpa capim com dietas à base de farelos vegetais e forragem - doi: 10.4025/actascianimsci.v32i3.9052 Feeding grass carp juveniles with plant-protein diets and forage - doi: 10.4025/actascianimsci.v32i3.9052

    Directory of Open Access Journals (Sweden)

    Fernando Strohschein Maschke

    2010-09-01

    Full Text Available Para avaliar o potencial dos ingredientes de origem vegetal como substitutos da farinha de carne suína em dietas para Ctenopharyngodon idella Valenciennes, (1844 (carpa capim, 180 juvenis (15 por tanque foram criados durante 60 dias em sistema de recirculação de água. Foi avaliada a substituição da farinha de carne suína (FCS por farelo de canola (FC, farelo de girassol (FG e a mistura dos farelos de canola e girassol (FCG. As dietas também continham farelo de soja como fonte proteica. O consumo diário de forragem (1,24 a 2,11% do peso vivo não diferiu entre os tratamentos. Peso final, ganho em peso, taxa de crescimento específico e conversão alimentar aparente não diferiram estatisticamente entre as dietas. O rendimento de filé foi maior nos tratamentos FC e FCG, enquanto o índice digestivossomático foi maior nos tratamentos FG e FCG. Maior teor de gordura e menores teores de proteína no peixe inteiro e de cinzas no filé foram obtidos no tratamento FCG. Os filés dos tratamentos FCS e FCG apresentaram maior valor de luminosidade. Os peixes da dieta FCS apresentaram maiores valores de proteínas, triglicerídeos e colesterol total no soro. Conclui-se que os farelos de canola e girassol podem ser utilizados em dietas para recria da carpa capim.To evaluate the potential of plant-protein sources to replace porcine meat meal in diets for grass carp juveniles, 180 fish (15 per tank were reared for 60 days in a re-use water system. We evaluated the replacement of porcine meat meal (FCS for canola meal (FC, sunflower meal (FG or a mixture of canola and sunflower meal (FCG. The diets were also composed of soybean meal as a protein source. Daily forage intake ranged from 1.24 to 2.11% body weight and did not differ among treatments. Final weight, weight gain, specific growth rate and feed conversion rate did not differ statistically among diets. The fillet yield was higher in FC and FCG diets, while the digestive-somatic index was

  16. New Mediterranean Biodiversity Records (October 2015

    Directory of Open Access Journals (Sweden)

    F. CROCETTA

    2015-11-01

    concomitantly from the entire Aegean Sea. Turkey: the alien rhodophyte Antithamnion hubbsii is first recorded from Turkey and the entire eastern Mediterranean. New distributional data are also offered for the native fishes Alectis alexandrina and Heptranchias perlo. In particular, the former record is constituted by a juvenile of 21.38 mm total length, whilst the latter by a mature male. Cyprus: the rare native cephalopod Macrotritopus defilippi, and the alien crab Atergatis roseus, sea slug Plocamopherus ocellatus and fish Cheilodipterus novemstriatus are first recorded from the entire country. Lebanon: the alien crabs Actaea savignii and Matuta victor, as well as the alien fish Synanceia verrucosa, are first recorded from the entire country. In addition, the first Mediterranean record of A. savignii is backdated to 2006, whilst the high number of M. victor specimens observed in Lebanon first suggest its establishment in the basin. The Atlantic fishes Paranthias furcifer and Seriola fasciata, and the circumtropical Rachycentron canadum, are also first reported from the country. P. furcifer record backdate its presence in the Mediterranean to 2007, whilst S. fasciata records backdate its presence in the eastern Mediterranean to 2005. Finally, two of these latter species have been recently ascribed to alien species, but all the three species may better fit the cryptogenic category, if not a new one.

  17. The link between water quality and tidal marshes in a highly impacted estuary.

    Science.gov (United States)

    Meire, Patrick; Maris, Tom; van Damme, Stefan; Jacobs, Sander; Cox, Tom; Struyf, Eric

    2010-05-01

    The Schelde estuary is one of the most heavily impacted estuaries in Europe. During several decades, untreated waste water from large cities (e.g. Brussels, Antwerp, Valenciennes, Lille) and industries was discharged in the river. As a result, the Schelde estuary has the reputation of being one of the most polluted estuaries in Europe. For a long time (approx. 1950 - 1995) all forms of higher life (macro-invertebrates and fish) were absent in the fresh and brackish parts of the estuary. Due to European legislation, a large part of the sewage water is now treated resulting in a significant recovery of water quality in the estuary. However, next to water quality, the estuary also suffered serious habitat losses during the last decades, mostly due to economic development and changing hydrological conditions causing more erosion. Over the last fifteen years, the management of the estuary has changed fundamentally. It is now more and more focused on the restoration of ecosystem services. In this presentation we will document the changes in water quality over the last 50 years and summarize recent work on the role of tidal marshes on water quality within the freshwater part of the Schelde estuary. Our results stress the important of taking into account ecosystem services and habitat restoration for long-term estuarine management. .After decades of high inorganic nutrient concentrations and recurring anoxia and hypoxia, we observed a paradoxical increase in chlorophyll-a concentrations with decreasing nutrient inputs, indicating a regime shift. Our results indicate that the recovery of a hypereutrophied systems towards a classical eutrophied state, needs the reduction of waste loads below certain thresholds. Paradoxically, phytoplankton production was inhibited by high ammonia or low oxygen concentrations. The system state change is accompanied by large fluctuations in oxygen concentrations. The improved water quality resulted in a remarkable recovery of different groups

  18. Morphometric characteristics of Prochilodus lineatus (Valenciennes 1847, of the migratory and resident stocks of the river Mogí-Guaçu, São Paulo State, Brazil=Características morfométricas do curimbatá (Prochilodus lineatus dos estoques migradores e residentes do rio Mogi-Guaçu, Estado de São Paulo, Brasil

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    Márcia Regina Fragoso Machado

    2012-10-01

    Full Text Available The species Prochilodus lineatus, with great commercial relevance in the rivers Grande, Pardo and Mogi-Guaçu, is characterized by the formation of great shoals which are capable of developing wide migratory displacements. Current assay evaluates, by means of the morphometric characteristics and age, whether the curimbatás (P. lineatus of different migratory and resident stocks form a single population, with interactivities among the sub-populations during the ‘piracema’ period (reproduction migration. A completely randomized plot with a 4 x 2 factorial scheme, with four stocks (one resident and three migratory as factors and two genders (male and female, with thirty replicates, was employed, with each fish taken as an experimental unit. An 80.19% variation for the first principal component and an 8.09% variation for the second principal component were reported as provided by the ten morphometric variables of resident and migratory stocks. The resident stock had the highest rate for the whole morphometric variables. There was superposition of individual scores of the same characteristics among the migratory stocks. Significant predominance of males was observed among resident stocks and migratory stocks I and II. Morphometric similarity verified among the migratory stocks showed a single population, with small inter-population variations.A espécie Prochilodus lineatus é de grande importância comercial na região dos rios Grande, Pardo e Mogi-Guaçu e tem como característica a formação de grandes cardumes, apta a desenvolver amplos deslocamentos migratórios. O presente trabalho objetivou avaliar, por meio das características morfométricas e etária, se os curimbatás (P. lineatus dos diferentes estoques migradores e residentes constituem uma única população, havendo interação entre as sub-populações no período de piracema (migração reprodutiva. Utilizou-se um delineamento inteiramente casualizado em esquema fatorial 4 x 2, com quatro tipos de estoques (um residente e três migradores e dois sexos (macho e fêmea com trinta repetições, considerando cada peixe como unidade experimental. Foi observada variação de 80,19% para o primeiro componente principal e 8,09% do segundo componente principal fornecida pelas dez variáveis morfométricas dos estoques residentes e migradores. O estoque residente correspondeu aos maiores valores para todas as variáveis morfométricas. Houve sobreposição dos escores individuais das mesmas características entre os estoques migradores. Observou-se predominância de machos entre os estoques residentes e migrador I e II. As semelhanças morfométricas verificadas entre os estoques migradores indicam tratar-se de uma única população, com pequenas variações interpopulacional.

  19. La reagrupación familiar de africanos y latinoamericanos en la España mediterránea. Dinámicas y estructuras sociodemográficas

    Directory of Open Access Journals (Sweden)

    Gozálvez Pérez, Vicente

    2012-12-01

    ñol, su nivel de instrucción, sus posibilidades de ingresos, su estructura por sexo y edad, tamaño de las familias reagrupadas, etc. Se ofrece información para los dos colectivos continentales y para los subgrupos familiares —reagrupantes, cónyuges, hijos, progenitores y otros familiares—, y se utilizan escalas del conjunto estudiado y de ámbitos territoriales —Cataluña litoral, Comunidad Valenciana, Murcia-Almería—. Los africanos concentran los aspectos estructurales más negativos —idioma español, instrucción, ingresos,…—, pero también son los que declaran intenciones más firmes y generalizadas de permanencia en España. Las conclusiones orientan sobre el futuro de estos flujos. [fr] Le nombre d’étrangers autorisés à résider en Espagne entre 2006 et 2009 pour des raisons de regroupement familial démontrent l’importance acquise par cette forme d’immigration par rapport au total des nouveaux étrangers recensés. Cette recherche est fondée sur une enquête spécifique réalisée sur des demandeurs de regroupement africains et latino-américains, qui informent aussi sur les membres de leur famille ayant été regroupés, ayant eu recours ou non aux lois sur le regroupement. Les Africains et les Latino-Américains présentent des dynamiques et des structures sociodémographiques très différentes, ce qui est dû, entre autres causes, à l’ancienneté de leur flux migratoires, à leur fécondité, à la maîtrise de la langue espagnole, au niveau d’instruction, aux possibilités de revenus, à la structure par sexe et par âge, à la dimension des familles regroupées, etc. Nous présentons des informations sur les deux collectifs continentaux et sur les sous-groupes familiaux – demandeurs de regroupement, conjoints, enfants, géniteurs et autres membres de la famille –, et nous utilisons des échelles de l’ensemble étudié et des unités territoriales – littoral de la Catalogne, Communauté Valencienne, Murcie

  20. Ἡ χρονολογία τῆς ἀναγόρευσης καὶ τῆς στέψης τοῦ Θεοδώρου Α΄ τοῦ Λασκάρεως

    Directory of Open Access Journals (Sweden)

    Πάρις ΓΟΥΝΑΡΙΔΗΣ

    1985-09-01

    Full Text Available P. GounaridisLa date de la proclamation et du couronnement de Théo­dore I Laskaris  L'étude essaie d'établir la date de la proclamation et du couronnement du premier monarque de l'Etat de Nicée Théodore I Lascaris. La date de la proclamation précède d'une année l'éloge que Nicetas Choniates a fait à Théodore, quand ce dernier rentre d'une expédition. Cette expédition, dans l'éloge, est présentée comme une série d'événements sans interruption. En réalité, il s'agit de deux séries d'événements séparées de quelques mois.La première série est constituée des opérations de Théodore I contre David Comnène (occupation de Ploussias, siège d'Heraclée et l'inter­vention des Latins de Constantinople en faveur de David. L'auteur démontre que l'expédition des Latins en Asie Mineure pour divertir les forces de l'Etat de Nicée du siège d'Heraclée, n'est que l'expédition de l'empereur latin Henri d'Hainaut, rapportée par Henri de Valenciennes. Cette expédition date du début de l'hiver de 1206/7.La deuxième série d'événements se rapporte aux expéditions de Théo­dore contre les forces latines qui ont été installées dans la région de Nicomédie et finit par l'accord de trêves entre le monarque de Nicée et l'empereur latin en Mai/Juin 1207. L'auteur montre que: 1 la capture de Thierry de Los et de ses hommes, rapportée par Villehardouin n'est que la victoire du général de Théodore I Andronic Gidos, victoire qui, dans l'éloge de Nicetas Choniates, est attribuée au monarque de l'Etat nicéen. 2 L'expression de l'éloge τὸν τοῖχον ἐξαλεῖψαι καὶ τοὺς τοῦτον ἀλείφοντας est bien l'exigence de Théodore I que les Latins détruisent les ouvrages de défense construits dans la région de Nicomédie, pour conclure les trêves de Mai/Juin 1207. Or, l'éloge a été écrite au retour de Théodore de cette expédition, et par conséquent sa proclamation avait eu

  1. 环介导等温扩增联合横向流动试纸条可视化检测海豚链球菌方法的建立%Visual Detection of Streptococcus iniae Based on Loop- mediated Isothermal Amplification Combined with a Lateral Flow Dipstick

    Institute of Scientific and Technical Information of China (English)

    王瑞娜; 周前进; 陈炯

    2014-01-01

    urgently needed to effectively control the spread of streptococcicosis caused by S. iniae. In the present study, a LAMP-LFD method was developed to rapid detection of S. iniae, based on the loop-mediated isothermal amplification (LAMP) and visualization by a lateral flow dipstick (LFD). Three pairs of primers, i.e., gyrB-F3, gyrB-B3, gyrB-FIP, gyrB-BIP, gyrB-LF and gyrB-LB, were designed to recognize the gyrase subunit B (gyrB) gene of S. iniae;and among which the forward inner primer (gyrB-FIP) was biotinylated. A DNA probe (gyrB-HP) labeled by fluorescein isothiocyanate (FITC) was also designed specifically to recognize the gyrB gene. The biotinylated LAMP was performed and the LAMP product was hybridized with FITC-labeled probe and detected by LFD. The optimized assay could detect S. iniae by incubation at 65° C for 30 min, and under such conditions, the initiation time for positive amplification gradually increased as the concentration of template decreased, showing a typical linear relationship. Starting from isothermal amplification, the whole detection procedure needed only 40 min, which reduced by 2 h compared to conventional PCR assay. The LAMP-LFD could specifically detect S. iniae isolate and no amplification was observed from other pathogenic bacteria, e.g., the Streptococcus (i.e., Streptococcus dysgalactiae subsp., and et al), multiple Gram-positive bacteria (i.e., Staphylococcus aureus, Nocardia seriolae, and et al), and multiple Gram-negative bacteria (i.e., Vibrio harveyi, Pseudomonas aeruginosa, and et al). The detection limit of LAMP-LFD for pure culture of S. iniae was 8.70×101 cfu/mL (1.74 cfu/reaction), which was 10 fold higher than LAMP and 100 times higher than the conventional PCR assay. It was all positively detected when taking pure gDNA of S. iniae of 8.70×101 cfu/mL (the detection limit) as template in triplicate, which indicated good reproducibility. In the case of artificially contaminated liver tissue of Lateolabrax japonicus, the