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Auteur |
Nikolic, N.; Jérôme, M.; Fonteneau, A.; Evano, H.; Verrez-Bagnis, V. |
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Titre |
Identification of skipjack tuna juveniles based on DNA control region sequences and potential spawning area around reunion island |
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Article scientifique |
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Année |
2016 |
Publication |
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Revue Abrégée |
Environmental Biology of Fishes |
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Volume  |
99 |
Numéro |
2 |
Pages |
171-178 |
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Mots-Clés |
Age; dna; juvenile; Reunion island; skipjack tuna |
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Résumé |
In this study, we confirmed that DNA control region can be used to identify potential spawning area from pelagic juveniles species. We used the mitochondrial DNA control region to identify tuna juveniles predated by common dolphinfish and sampled in surface waters around Reunion Island. These were skipjack juveniles at an early stage (small length and young age). The biological results confirmed the species identification based on DNA analysis. Catch data by longline reveal a higher number of skipjack from October to December around Reunion Island corresponding to the period of our skipjack juvenile sampling |
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0378-1909 |
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MARBEC @ isabelle.vidal-ayouba @ |
collection |
1518 |
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Auteur |
Zupa, R.; Fauvel, C.; Mylonas, C.C.; Pousis, C.; Santamaria, N.; Papadaki, M.; Fakriadis, I.; Cicirelli, V.; Mangano, S.; Passantino, L.; Lacalandra, G.M.; Corriero, A. |
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Titre |
Rearing in captivity affects spermatogenesis and sperm quality in greater amberjack, Seriola dumerili (Risso, 1810) |
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Article scientifique |
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Année |
2017 |
Publication |
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Revue Abrégée |
J. Anim. Sci. |
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Volume |
95 |
Numéro |
9 |
Pages |
4085-4100 |
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Mots-Clés |
acute stress; apoptosis; atlantic bluefin tuna; cultured fish; germ cell apoptosis; germ cell proliferation; germ-cell proliferation; greater amberjack; Marine fish; Motility; ovarian-steroid production; rearing in captivity; reproductive-biology; Seriola dumerili; Sperm quality; thunnus-thynnus l. |
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Résumé |
The greater amberjack, Seriola dumerili (Risso, 1810), is a promising candidate for the diversification of European aquaculture production, but inconsistent reproduction in captivity prevents commercial production. Recent studies showed that greater amberjack confined in sea cages exhibited scarce gonad development and early interruption of gametogenic activity during the reproductive season. The aim of the present study was to improve our understanding of the observed impairment of spermatogenesis. Adult wild and captive-reared males were sampled during 3 different phases of the reproductive cycle: early gametogenesis (EARLY; late April to early May), advanced gametogenesis (ADVANCED; late May to early June), and spawning (SPAWNING; late June to July). Spermatogonial stem cells and proliferating germ cells were identified through the immunohistochemical localization of Pou5f1 and proliferating cell nuclear antigen, respectively. Apoptotic germ cells were identified throughout the terminal deoxynucleotidyl transferase-mediated 2'-deoxyuridine 5'-triphosphate nick end labeling method. Sperm quality of captive-reared fish was evaluated using computer-assisted sperm analysis. Captive-reared males exhibited seminiferous lobules of a smaller diameter, a precocious and progressive decrease of spermatogonial mitosis, and a high level of apoptosis at the beginning of the reproductive season, concomitant with a many-fold higher 17 beta-estradiol plasma concentration. The motile spermatozoa percentage of captive greater amberjack was lower than in other teleosts, and a drastic decrease of spermatozoa motility duration, velocity, and ATP content occurred along the reproductive season. An abnormal increase of sperm concentration as well as an increase of dead spermatozoa occurred during the SPAWNING phase, probably because of lack of sperm hydration and ejaculation and consequent sperm ageing. The present study demonstrates the extreme susceptibility of greater amberjack to rearing stress and underscores the need for improvement of the rearing and handling procedures to ameliorate gametogenesis dysfunctions in commercial aquaculture production. |
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English |
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0021-8812 |
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Numéro d'Appel |
MARBEC @ alain.herve @ |
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2210 |
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Auteur |
Filmalter, J.D.; Cowley, P.D.; Potier, M.; Menard, F.; Smale, M.J.; Cherel, Y.; Dagorn, L. |
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Titre |
Feeding ecology of silky sharks Carcharhinus falciformis associated with floating objects in the western Indian Ocean |
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Article scientifique |
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Année |
2017 |
Publication |
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Revue Abrégée |
J. Fish Biol. |
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Volume |
90 |
Numéro |
4 |
Pages |
1321-1337 |
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Mots-Clés |
atlantic; By-catch; diet; ecosystem; fad; fish aggregating devices; fish aggregation device; food-consumption; isurus-oxyrinchus; pacific-ocean; pelagic fishes; Pelagic shark; Purse-seine fishery; shortfin mako; Yellowfin tuna |
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Résumé |
The silky shark Carcharhinus falciformis is commonly associated with floating objects, including fish aggregating devices (FADs), in the Indian Ocean. While the motives for this associative behaviour are unclear, it does make them vulnerable to capture in the tuna purse seine fishery that makes extensive use of FADs. Here, the diet of 323 C. falciformis, caught at FADs in the Indian Ocean, was investigated to test the hypothesis that trophic benefits explain the associative behaviour. A high proportion of stomachs with fresh contents (57%) suggested that extensive feeding activity occurred while associated with FADs. Multiple dietary indices showed that typical non-associative prey types dominated, but were supplemented with fishes typically found at FADs. While the trophic benefits of FAD association may be substantial, our results suggest that associative behaviour is not driven solely by feeding. (C) 2016 The Fisheries Society of the British Isles |
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English |
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0022-1112 |
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pas de |
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Numéro d'Appel |
MARBEC @ alain.herve @ |
collection |
2142 |
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Auteur |
Díez, G.; Moreno, G.; Galaz, T.; Dagorn, L.; Murua, J. |
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Titre |
Digestive activity and stomach temperature in farmed bluefin tuna Thunnus thynnus measured by acoustic tag |
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Article scientifique |
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Année |
2017 |
Publication |
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Revue Abrégée |
J Fish Biol |
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Volume |
90 |
Numéro |
6 |
Pages |
2504-2511 |
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Mots-Clés |
acoustic; Bluefin tuna; digestion; farm; tag; Temperature |
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Résumé |
Eight farmed Atlantic bluefin tuna Thunnus thynnus were tagged with temperature and depth transmitters inserted in chub mackerels Scomber colias to characterize their digestive activity, feeding physiology and behaviour in captivity. Results obtained in the experiment can be used to optimize daily T. thynnus feeding strategy in farms, reducing the early regurgitation of food and thus the environmental effects of inappropriate feeding practices. |
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Langue |
en |
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Titre de collection Abrégé |
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1095-8649 |
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Numéro d'Appel |
MARBEC @ isabelle.vidal-ayouba @ |
collection |
2145 |
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Auteur |
Grande, M.; Murua, H.; Zudaire, I.; Arsenault-Pernet, E.J.; Pernet, F.; Bodin, N. |
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Titre |
Energy allocation strategy of skipjack tuna Katsuwonus pelamis during their reproductive cycle |
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Article scientifique |
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Année |
2016 |
Publication |
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Revue Abrégée |
J. Fish Biol. |
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Volume |
89 |
Numéro |
5 |
Pages |
2434-2448 |
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Mots-Clés |
bonito euthynnus-pelamis; cod gadus-morhua; fatty-acid-composition; highly migratory fish; Income breeder; Indian Ocean; lipid classes; oocyte growth; reproduction; sarda-sarda; teleost fish; thunnus-albacares; Tropical tuna; western indian-ocean |
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Résumé |
The lipid composition of somatic and reproductive tissues was determined for female skipjack tuna Katsuwonus pelamis caught in the western Indian Ocean between latitude 10 degrees N and 20 degrees S and longitude 40 degrees and 70 degrees E. The highest total lipid (TL) contents were in the liver and gonads, with white muscle levels approximately three-fold lower. Three lipid classes dominated: triacylglycerols (TAG), sterol esters and wax esters (SE-WE) and phospholipids (PL). Collectively, these accounted for between 70 and 80% of TLs. Changes in lipid concentrations were evaluated over the maturation cycle. Immature fish had the lowest gonad and liver TL levels; concentrations of TL, TAG, SE-WE and PL accumulated from immature to mature (spawning-capable) phase, reflecting sustained vitellogenic activity of the liver and a transfer of lipids to developing oocytes from the onset of vitellogenesis. Gonado-somatic and hepato-somatic indices were positively correlated with each other and positively related to TL in the gonads and liver. Fulton's condition index and lipid concentrations in muscle did not vary significantly over the maturation cycle; fat content in the main storage tissues was undepleted as the ovary developed. Hence, K. pelamis apparently supports reproduction directly from food intake over the breeding season. In the gonads, reserve lipids (SE-WE and TAG) and sterols were related to batch fecundity but this was not the case for somatic and hepatic tissues. These results suggest that K. pelamis utilizes an income breeding strategy. |
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English |
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ISSN |
0022-1112 |
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Numéro d'Appel |
MARBEC @ alain.herve @ |
collection |
1685 |
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