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Do commercial fisheries display optimal foraging? The case of longline fishers in competition with odontocetes

Gaëtan Richard 1, 2, 3 Christophe Guinet 3 Julien Bonnel 4, 1 Nicolas Gasco 2 Paul Tixier 5
1 Lab-STICC_ENSTAB_CID_TOMS
Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance
4 Pôle STIC_AP
ENSTA Bretagne - École Nationale Supérieure de Techniques Avancées Bretagne
Abstract : Depredation in longline fisheries by odontocete whales is a worldwide growing issue, having substantial socio-economic consequences for fishers as well as conservation implications for both fish resources and the depredating odontocete populations. An example of this is the demersal longline fishery operating around the Crozet Archipelago and Kerguelen Island, southern Indian Ocean, where killer whales (Orcinus orca) and sperm whales (Physeter macrocephalus) depredate hooked Patagonian toothfish (Dissostichus eleginoides). It is of great interest to better understand relationships of this modern fishery with its environment. Thus, we examined the factors influencing the decision making process of fishers facing such competition while operating on a patch. Using optimal foraging theory as the underlying hypothesis, we determined that the probability captains left an area decreases with increasing fishing success whereas, in presence of competition from odontocete whales, it increases. Our study provides strong support that fishers behave as optimal foragers in this specific fishery. Considering that captains are optimal foragers and thus aim at maximising the exploitation of the resources, we highlight possible risks for the long-term sustainability of the local ecosystems
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https://hal.archives-ouvertes.fr/hal-01572425
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Soumis le : lundi 7 août 2017 - 11:49:36
Dernière modification le : mercredi 24 juin 2020 - 16:19:52

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Gaëtan Richard, Christophe Guinet, Julien Bonnel, Nicolas Gasco, Paul Tixier. Do commercial fisheries display optimal foraging? The case of longline fishers in competition with odontocetes. Canadian Journal of Fisheries and Aquatic Sciences, NRC Research Press, 2018, 75 (6), pp.964-976. ⟨10.1139/cjfas-2016-0498⟩. ⟨hal-01572425⟩

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