Title Interactions of Patagonian toothfish fisheries with killer and sperm whales in the Crozet Islands Exclusive Economic Zone; an assessment of depredation levels and insights on possible mitigation strategies
Author Tixier, P.; Gasco, N.; Duhamel, G.; Viviant, M.; Authier, M.; Guinet, C.
Author Affil Tixier, P., CNRS, Centre d'Etudes Biologiques de Chize, Villiers en Bois, France. Other: Museum National d'Histoire Naturelle, France
Source CCAMLR Science, Vol.17, p.179-195. Publisher: Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR), International. ISSN: 1023- 4063
Publication Date 2010
Notes In English GeoRef Acc. No: 309658
Index Terms Indian Ocean Islands--Crozet Islands; Southern Ocean; behavior; Cetacea; Chordata; Crozet Islands; Delphinidae; diet; Eutheria; Exclusive Economic Zone; feeding; fisheries; Indian Ocean Islands; Mammalia; mitigation; Orcinus orca; Physeter macrocephalus; Physeteridae; predation; preventive measures; subantarctic regions; Tetrapoda; Theria; Vertebrata
Abstract Between 2003-08, Patagonian toothfish longline fishery within Crozet Islands EEZ lost total of 571 tons of toothfish to depredation by sperm whales (32.6% of hauled lines), killer whales (18.6%) and two species co-occurring (23.4%). Killer whales accounted for 75% of loss, and sperm whales had lower impact at 25%. Photo-identification showed 35 killer whales belonging to four different pods were involved in 81.3% of interactions. Significant variation of interaction rates with killer whales between vessels suggests influence of operational factors on depredation. Results indicate that when facing depredation vessels should travel at least 40 nautical miles to prevent killer whales from finding them again within a few hours.
Publication Type journal article
Record ID 91398