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Auteur Escalle, L.; Murua, H.; Amande, J.M.; Arregui, I.; Chavance, P.; Delgado de Molina, A.; Gaertner, D.; Fraile, I.; Filmalter, J.D.; Santiago, J.; Forget, F.; Arrizabalaga, H.; Dagorn, L.; Mérigot, B.
Titre Post-capture survival of whale sharks encircled in tuna purse-seine nets: tagging and safe release methods Type Article scientifique
Année 2016 Publication Revue Abrégée Aquatic Conserv: Mar. Freshw. Ecosyst.
Volume 25 Numéro 4 Pages 433-447
Mots-Clés mega fauna; post-release mortality; Psat; Rhincodon typus; tropical tuna purse-seine
Résumé 1. Whale shark, the world's largest fish, is believed to be particularly vulnerable owing to its biological characteristics (slow growth, late maturation, great longevity) and is listed as Vulnerable by IUCN and included in Appendix II of CITES. 2. Whale sharks are occasionally encircled in tropical tuna purse-seine nets, throughout this global fishery. Although apparent immediate survival rates following encirclement and release have recently been assessed through scientific onboard observer programmes, a more rigorous methodology is still required for studying post-released survival. 3. This work provides a method for applying pop-up satellite tags and reports an enhanced release procedure for whale sharks. The first assessment of survival after release from purse-seine nets involved six whale sharks tagged between May and September 2014 in the eastern tropical Atlantic Ocean. Five tags transmitted data: three popped up as programmed (after 30 days), while two surfaced prematurely (one after 21 and the other after 71 days (programmed to pop off after 30 and 90 days, respectively)) but showed no sign of unusual behaviour. 4. Overall, whale sharks survived at least 21 days (one at least 71 days) after release from purse-seine nets. These observations based on five large individuals (total length > 8 m), suggest that whale sharks have a good chance of survival when released with the proposed method. 5. Additional tagging in this and other oceans, especially of juveniles which may be more sensitive to encirclement and release operations, is essential to further assess whale shark post-release survival rates in tuna purse-seine fisheries. Copyright © 2016 John Wiley & Sons, Ltd.
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ISSN 1099-0755 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection (down) 1547
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Auteur Pecoraro, C.; Babbucci, M.; Villamor, A.; Franch, R.; Papetti, C.; Leroy, B.; Ortega-Garcia, S.; Muir, J.; Rooker, J.; Arocha, F.; Murua, H.; Zudaire, I.; Chassot, E.; Bodin, N.; Tinti, F.; Bargelloni, L.; Cariani, A.
Titre Methodological assessment of 2b-RAD genotyping technique for population structure inferences in yellowfin tuna (Thunnus albacares) Type Article scientifique
Année 2016 Publication Revue Abrégée Marine Genomics
Volume 25 Numéro Pages 43-48
Mots-Clés Marine fish; Population genomics; RAD sequencing; Snp; Tropical tuna; Tuna fishery
Résumé Global population genetic structure of yellowfin tuna (Thunnus albacares) is still poorly understood despite its relevance for the tuna fishery industry. Low levels of genetic differentiation among oceans speak in favour of the existence of a single panmictic population worldwide of this highly migratory fish. However, recent studies indicated genetic structuring at a much smaller geographic scales than previously considered, pointing out that YFT population genetic structure has not been properly assessed so far. In this study, we demonstrated for the first time, the utility of 2b-RAD genotyping technique for investigating population genetic diversity and differentiation in high gene-flow species. Running de novo pipeline in Stacks, a total of 6772 high-quality genome-wide SNPs were identified across Atlantic, Indian and Pacific population samples representing all major distribution areas. Preliminary analyses showed shallow but significant population structure among oceans (FST = 0.0273; P-value < 0.01). Discriminant Analysis of Principal Components endorsed the presence of genetically discrete yellowfin tuna populations among three oceanic pools. Although such evidence needs to be corroborated by increasing sample size, these results showed the efficiency of this genotyping technique in assessing genetic divergence in a marine fish with high dispersal potential.
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ISSN 1874-7787 ISBN Médium
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Numéro d'Appel MARBEC @ alain.herve @ collection (down) 1539
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Auteur Nikolic, N.; Jérôme, M.; Fonteneau, A.; Evano, H.; Verrez-Bagnis, V.
Titre Identification of skipjack tuna juveniles based on DNA control region sequences and potential spawning area around reunion island Type Article scientifique
Année 2016 Publication Revue Abrégée Environmental Biology of Fishes
Volume 99 Numéro 2 Pages 171-178
Mots-Clés Age; dna; juvenile; Reunion island; skipjack tuna
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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ISSN 0378-1909 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection (down) 1518
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Auteur Travassos Tolotti, M.; Filmalter, J.D.; Bach, P.; Travassos, P.; Seret, B.; Dagorn, L.
Titre Banning is not enough: The complexities of oceanic shark management by tuna regional fisheries management organizations Type Article scientifique
Année 2015 Publication Revue Abrégée Global Ecology and Conservation
Volume 4 Numéro Pages 1-7
Mots-Clés Bycatch; conservation; Fin trade; Pelagic shark; Tuna fisheries
Résumé Recently, declining populations of several pelagic shark species have led to global conservation concerns surrounding this group. As a result, a series of species-specific banning measures have been implemented by Regional Fishery Management Organizations (RFMOs) in charge of tuna fisheries, which include retention bans, finning bans and trading bans. There are both positive and negative aspects to most management measures, but generally, the positive aspects outweigh the negatives, ensuring the measure is beneficial to the resource and its users in the long term. Banning measures are a good first step towards the conservation of pelagic shark species, especially since they improve conservation awareness among fishers, managers and the public. Measures that impose total bans, however, can lead to negative impacts that may jeopardize the populations they were intended to protect. The majority of pelagic shark catches are incidental and most sharks die before they reach the vessel or after they are released. The legislation set out by RFMOs only prevents retention but not the actual capture or the mortality that may occur as a result. Managers should be fully aware that the development and implementation of mitigation measures are critical for a more effective conservation strategy.
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ISSN 2351-9894 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection (down) 1498
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Auteur Mariani, P.; Křivan, V.; MacKenzie, B.R.; Mullon, C.
Titre The migration game in habitat network: the case of tuna Type Article scientifique
Année 2016 Publication Revue Abrégée Theor Ecol
Volume 9 Numéro 2 Pages 219-232
Mots-Clés Bluefin tuna; Game theory; Habitat selection; Ideal free distribution; Plant Sciences; Structured population; Theoretical Ecology/Statistics; Zoology
Résumé Long-distance migration is a widespread process evolved independently in several animal groups in terrestrial and marine ecosystems. Many factors contribute to the migration process and of primary importance are intra-specific competition and seasonality in the resource distribution. Adaptive migration in direction of increasing fitness should lead to the ideal free distribution (IFD) which is the evolutionary stable strategy of the habitat selection game. We introduce a migration game which focuses on migrating dynamics leading to the IFD for age-structured populations and in time varying habitats, where dispersal is costly. The model predicts migration dynamics between these habitats and the corresponding population distribution. When applied to Atlantic bluefin tunas, it predicts their migration routes and their seasonal distribution. The largest biomass is located in the spawning areas which have also the largest diversity in the age-structure. Distant feeding areas are occupied on a seasonal base and often by larger individuals, in agreement with empirical observations. Moreover, we show that only a selected number of migratory routes emerge as those effectively used by tunas.
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ISSN 1874-1738, 1874-1746 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection (down) 1465
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