Movement behaviour and fishery interaction of silky sharks (Carcharhinus falciformis) in the tropical tuna purse seine fishery in the Western Indian Ocean
| Autor: | John D. Filmalter, Laurent Dagorn, Robert K Bauer, Fabien Forget, Paul D. Cowley |
|---|---|
| Přispěvatelé: | South African Institute for Aquatic Biodiversity (SAIAB), South African Institute for Aquatic Biodiversity, MARine Biodiversity Exploitation and Conservation (UMR MARBEC), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut de Recherche pour le Développement (IRD) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
Fish Aggregating Device fad [SDE.MCG]Environmental Sciences/Global Changes tagging Aquatic Science Oceanography 010603 evolutionary biology 01 natural sciences 14. Life underwater Ecology Evolution Behavior and Systematics postrelease survival biology pelagic sharks aggregating devices fads 010604 marine biology & hydrobiology pelagic biology.organism_classification mortality satellite tag Fishery Indian ocean Geography Bycatch Carcharhinus ecology [SDE.BE]Environmental Sciences/Biodiversity and Ecology Tuna |
| Zdroj: | ICES Journal of Marine Science ICES Journal of Marine Science, Oxford University Press (OUP), 2021, 78 (7), pp.2474--2485. ⟨10.1093/icesjms/fsab119⟩ |
| ISSN: | 1054-3139 1095-9289 |
| DOI: | 10.1093/icesjms/fsab119⟩ |
| Popis: | The silky shark Carcharhinus falciformis regularly associates with floating objects in the open ocean, resulting in relatively high levels of bycatch in industrial tuna purse seine fisheries using drifting fish aggregating devices (FADs). This bycatch has contributed to concerns regarding the sustainability of this fishery and its impact on silky shark populations. To investigate fishery interactions, movements of 28 silky sharks (86–235 cm TL, mean = 118 cm) fitted with pop-up and archival tags in the western Indian Ocean, between 2010 and 2012, were examined. Monthly overlap between probability surfaces of sharks and two fishery metrics (FAD-tuna catches and FAD positions) were calculated. Vertical habitat use overlapped almost entirely with operational gear depth. Horizontal movements were extensive (3–5024 km) and covered large areas of the western Indian Ocean. Monthly overlap with FAD distributions was consistently high (64.03–100%) highlighting the need for compliance with FAD design regulations to avoid entanglement. Monthly overlap with tuna catches was more variable (8.43–51.83%). The observed movement patterns suggest static spatial management measures would be have limited conservation impact, however dynamic approaches could be appropriate. Limiting fishery activities directly will likely have the greatest conservation outcomes for silky sharks in the purse seine fishery. |
| Databáze: | OpenAIRE |
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