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Auteur |
Gilman, E.; Chaloupka, M.; Bach, P.; Fennell, H.; Hall, M.; Musyl, M.; Piovano, S.; Poisson, F.; Song, L. |
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Titre |
Effect of pelagic longline bait type on species selectivity: a global synthesis of evidence |
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Article scientifique |
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Année |
2020 |
Publication |
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Revue Abrégée |
Rev. Fish. Biol. Fish. |
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Volume |
30 |
Numéro |
3 |
Pages |
535-551 |
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Mots-Clés  |
atlantic-ocean; Bait; by-catch; Bycatch; caretta-caretta; circle hooks; feeding-behavior; Longline; Mitigation; publication bias; sea-turtles; Selectivity; shark populations; size-selectivity; swordfish xiphias-gladius; Tuna |
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Résumé |
Fisheries can profoundly affect bycatch species with 'slow' life history traits. Managing bait type offers one tool to control species selectivity. Different species and sizes of marine predators have different prey, and hence bait, preferences. This preference is a function of a bait's chemical, visual, acoustic and textural characteristics and size, and for seabirds the effect on hook sink rate is also important. We conducted a global meta-analysis of existing estimates of the relative risk of capture on different pelagic longline baits. We applied a Bayesian random effects meta-analytic regression modelling approach to estimate overall expected bait-specific catch rates. For blue shark and marine turtles, there were 34% (95% HDI: 4-59%) and 60% (95% HDI: 44-76%) significantly lower relative risks of capture on forage fish bait than squid bait, respectively. Overall estimates of bait-specific relative risk were not significantly different for seven other assessed taxa. The lack of a significant overall estimate of relative capture risk for pelagic shark species combined but significant effect for blue sharks suggests there is species-specific variability in bait-specific catch risk within this group. A qualitative literature review suggests that tunas and istiophorid billfishes may have higher catch rates on squid than fish bait, which conflicts with reducing marine turtle and blue shark catch rates. The findings from this synthesis of quantitative and qualitative evidence support identifying economically viable bycatch management measures with acceptable tradeoffs when multispecies conflicts are unavoidable, and highlight research priorities for global pelagic longline fisheries. |
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English |
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Titre de collection Abrégé |
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ISSN |
0960-3166 |
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Notes |
WOS:000555361400001 |
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pas de |
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Numéro d'Appel |
MARBEC @ isabelle.vidal-ayouba @ |
collection |
2843 |
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Auteur |
Bodin, N.; Lesperance, D.; Albert, R.; Hollanda, S.; Michaud, P.; Degroote, M.; Churlaud, C.; Bustamante, P. |
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Titre |
Trace elements in oceanic pelagic communities in the western Indian Ocean |
Type |
Article scientifique |
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Année |
2017 |
Publication |
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Revue Abrégée |
Chemosphere |
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Volume |
174 |
Numéro |
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Pages |
354-362 |
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Mots-Clés |
atlantic-ocean; blue marlin; Environmental risk assessment; makaira-nigricans; Marine fish; Mediterranean Sea; Mercury; mercury content; North Pacific; risk-assessment; Seafood; Selenium; swordfish xiphias-gladius; Tuna fisheries' bycatch |
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Résumé |
The mineral composition of target and non-target pelagic fish caught by purse-seiners and longliners in the western-central Indian Ocean was determined. From the 10 essential elements analysed, selenium and zinc showed the highest concentrations in swordfish and blue marlin while Indian mackerel appeared as a good source of copper, iron and chrome. All catch had levels of lead and cadmium, two toxic elements, below the maximum sanitary limits. Although some concerns were raised regarding mercury concentrations in the largest species (wahoo, swordfish and blue marlin), molar ratios of mercury and selenium indicate that all oceanic pelagic fish from the western-central Indian Ocean are safe for human consumption. This study also gives insights on the relationships between the levels of essential and toxic elements in fish muscle and the size, trophic position and diet sources of the studied pelagic species. (C) 2017 Elsevier Ltd. All rights reserved. |
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English |
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0045-6535 |
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Numéro d'Appel |
MARBEC @ alain.herve @ |
collection |
2119 |
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Auteur |
Torres-Irineo, E.; Dreyfus-Leon, M.; Gaertner, D.; Salas, S.; Marchal, P. |
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Titre |
Adaptive responses of tropical tuna purse-seiners under temporal regulations |
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Article scientifique |
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Année |
2017 |
Publication |
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Revue Abrégée |
Ambio |
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Volume |
46 |
Numéro |
1 |
Pages |
88-97 |
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Mots-Clés |
atlantic; behavior; Closed season; eastern pacific-ocean; eastern tropical pacific; Fisher behaviour; Fisheries management; fishing strategies; fleet dynamics; mixed fisheries; model; Purse-seine fishing; state; trawlers; Tropical tuna |
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Résumé |
The failure to achieve fisheries management objectives has been broadly discussed in international meetings. Measuring the effects of fishery regulations is difficult due to the lack of detailed information. The yellowfin tuna fishery in the eastern Pacific Ocean offers an opportunity to evaluate the fishers' responses to temporal regulations. We used data from observers on-board Mexican purse-seine fleet, which is the main fleet fishing on dolphin-associated tuna schools. In 2002, the Inter-American Tropical Tuna Commission implemented a closed season to reduce fishing effort for this fishery. For the period 1992-2008, we analysed three fishery indicators using generalized estimating equations to evaluate the fishers' response to the closure. We found that purse-seiners decreased their time spent in port, increased their fishing sets, and maintained their proportion of successful fishing sets. Our results highlight the relevance of accounting for the fisher behaviour to understand fisheries dynamics when establishing management regulations. |
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Auteur institutionnel |
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Langue |
English |
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Titre de collection Abrégé |
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ISSN |
0044-7447 |
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Notes |
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pas de |
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Numéro d'Appel |
MARBEC @ alain.herve @ |
collection |
2072 |
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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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Auteur institutionnel |
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English |
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Titre de collection Abrégé |
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ISSN |
0022-1112 |
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Notes |
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pas de |
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Numéro d'Appel |
MARBEC @ alain.herve @ |
collection |
2142 |
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Auteur |
Gaertner, D.; Hallier, J.-P. |
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Titre |
Tag shedding by tropical tunas in the Indian Ocean and other factors affecting the shedding rate |
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Article scientifique |
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Année |
2015 |
Publication |
Fisheries Research |
Revue Abrégée |
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Volume |
163 |
Numéro |
Si |
Pages |
98-105 |
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Mots-Clés |
averaging; Bayesian model; Beta-binomial model; Indian Ocean; Shedding rate; Tagging data; Tropical tunas |
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Résumé |
A key objective of the Regional Tuna Tagging Project Indian Ocean was to estimate tag-shedding rates, Type-I (immediate tag shedding) and Type-II (long-term tag shedding). To assess this, a series of double-tagging experiments (26,899 double tags released with 4555 recoveries) were conducted as part of the broader tagging program. After omitting data from tags placed by less experienced taggers, the results of our analyses did not show any evidence that individual differences between taggers (i.e., a tagger effect) impacted estimates of tag-shedding rates. However, it was shown that the probability of retaining the second tag (inserted in the left side of the fish) was larger than retaining the first tag (inserted in the right side, i.e., the side typically tagged in single-tagging experiments). We used a Bayesian model averaging approach to account for model uncertainty in the estimates of the parameters a and L used to calculate the probability of tag retention Q(t)= alpha e-((L t)) for the right tag. The parameter estimates were alpha = 0.993 and L (per year) = 0.030 (skipjack); alpha = 0.972 and L (per year) = 0.040 (yellowfin); and alpha = 0.990 and L (per year) = 0.021 (bigeye). These results agree with estimates obtained by other large-scale tropical tuna tagging projects. We showed that tag loss has a moderate impact on the underestimation of the exploitation rate (bias = 2-6% depending on the tuna species). However, non-reporting leads to a bias of around 7% when using the high reporting rate estimate of purse seiners. Finally, tag shedding (specifically Type-II shedding) modified the individual weights of the samples of recaptures. Consequently, the total instantaneous mortality estimates (Z; calculated from mean times-at-large) were reduced by a range of 1-3%. |
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Auteur institutionnel |
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Lieu de Publication |
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Éditeur |
Murua, H.; Marsac, F.; Eveson, J.P. |
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Titre de collection Abrégé |
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ISSN |
0165-7836 |
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Numéro d'Appel |
MARBEC @ isabelle.vidal-ayouba @ |
collection |
1104 |
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