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Article Dans Une Revue Reviews in Fish Biology and Fisheries Année : 2020

Effect of pelagic longline bait type on species selectivity: a global synthesis of evidence

Milani Chaloupka
  • Fonction : Auteur
Hannah Fennell
  • Fonction : Auteur
Martin Hall
  • Fonction : Auteur
Michael Musyl
  • Fonction : Auteur
Susanna Piovano
  • Fonction : Auteur
Liming Song
  • Fonction : Auteur

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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hal-03410884 , version 1 (17-12-2021)

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Eric Gilman, Milani Chaloupka, Pascal Bach, Hannah Fennell, Martin Hall, et al.. Effect of pelagic longline bait type on species selectivity: a global synthesis of evidence. Reviews in Fish Biology and Fisheries, 2020, 30 (3), pp.535--551. ⟨10.1007/s11160-020-09612-0⟩. ⟨hal-03410884⟩
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