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

Type Article
Date 2020-09
Language English
Author(s) Gilman Eric1, Chaloupka Milani2, Bach Pascal3, 9, Fennell Hannah4, Hall Martin5, Musyl Michael6, Piovano Susanna7, Poisson Francois3, 8, Song Liming
Affiliation(s) 1 : Pelagic Ecosystems Research Collective, Honolulu, USA
2 : Ecological Modelling Services Pty Ltd and Marine Spatial Ecology Lab, University of Queensland, Brisbane, Australia
3 : MARBEC, Université de Montpellier, CNRS, IFREMER, IRD, Sète, France
4 : Heriot-Watt University, Edinburgh, UK
5 : Inter-American Tropical Tuna Commission, La Jolla, USA
6 : Pelagic Research Group, Honolulu, USA
7 : School of Marine Studies, University of the South Pacific, Suva, Fiji
8 : Shanghai Ocean University, Shanghai, China
9 : MARBEC, Université de Montpellier, CNRS, IFREMER, IRD, Sète, France
Source Reviews In Fish Biology And Fisheries (0960-3166) (Springer Science and Business Media LLC), 2020-09 , Vol. 30 , N. 3 , P. 535-551
DOI 10.1007/s11160-020-09612-0
WOS© Times Cited 25
Keyword(s) Bait, Bycatch, Longline, Mitigation, Selectivity, Tuna

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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Gilman Eric, Chaloupka Milani, Bach Pascal, Fennell Hannah, Hall Martin, Musyl Michael, Piovano Susanna, Poisson Francois, Song Liming (2020). Effect of pelagic longline bait type on species selectivity: a global synthesis of evidence. Reviews In Fish Biology And Fisheries, 30(3), 535-551. Publisher's official version : https://doi.org/10.1007/s11160-020-09612-0 , Open Access version : https://archimer.ifremer.fr/doc/00643/75536/