Biquet J. A., Tixier Paul, Richard G., Soehnlen M., Thellier T., Carzon P., Clua E., Guinet C. (2024). Toothed whale and shark depredation and bycatch in the longline fishery of French Polynesia. Fisheries Research, 271, p. 106928 [12 p.]. ISSN 0165-7836.
Titre du document
Toothed whale and shark depredation and bycatch in the longline fishery of French Polynesia
Année de publication
2024
Auteurs
Biquet J. A., Tixier Paul, Richard G., Soehnlen M., Thellier T., Carzon P., Clua E., Guinet C.
Source
Fisheries Research, 2024,
271, p. 106928 [12 p.] ISSN 0165-7836
Marine megafauna feeding on fishery catches (depredation) or being incidentally caught on fishing gear (bycatch) have become important issues. Their socioeconomic and conservation stakes have been increasingly studied across the world fisheries. They remain understudied in the Pacific Ocean, where longline tuna fisheries reported such interactions. In this study, we provide the first assessment of bycatch and depredation by sharks and odontocetes on longlines in French Polynesia between 2000 and 2018, using data from observers reporting, captains' logbooks, questionnaires and additional monitoring by authors during three fishing trip. We found that less than 2% of the catch had been depredated, and that shark depredation was more common than odontocete depredation. Shark bycatch was important (20,000 sharks annually, 0.5 shark every 1000 hooks) and odontocete bycatch seemed low (13 occurrences in 18 years), though we identified clear reporting flaws. We discuss the range of uncertainty associated with our assessment, based on the current reporting systems, and the potential consequences of depredation and bycatch on tuna fisheries, as well as on shark and odontocete populations in French Polynesia.
Plan de classement
Ressources halieutiques [040]
;
Etudes, transformation, conservation du milieu naturel [082]
Description Géographique
POLYNESIE FRANCAISE ; PACIFIQUE
Localisation
Fonds IRD [F B010088961]
Identifiant IRD
fdi:010088961
