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Brotons, José María; Grau, Antonio María; Rendell, Luke
Marine mammal science, 2008, 2008-01, January 2008, 2008-01-00, Letnik: 24, Številka: 1Journal Article
Interactions between marine mammals and fisheries are a growing problem, and effective management requires assessment of the factors driving the interaction and of the impacts on fisheries. We used data from interactions between artisanal fisheries and bottlenose dolphins around the Balearic Islands to assess these factors and impacts. Observers collected data during 1,040 fishing operations over 3 yr. Location and year were important factors affecting interaction probability, with some areas showing large increases over the study period. We estimated the combined cost of catch loss and net damage as 6.5% of the total catch value (95% CI -12.3%, -1.6%), and the annual loss to be 3.4% (95% CI -6.5%, -0.1%) of the total catch by weight. This weight equates to the dietary needs of ~12 dolphins (95% CI 0.2, 22), suggesting the fishery is not a vital food source for the dolphin population. Two dolphins died through entanglement during the observed fishing operations. We observed 3% of the total fishing activity, by weight, in 2003; scaling up this mortality directly suggests that as many as sixty dolphins may be dying in nets each year. This interaction likely has serious conservation implications for the dolphin population.
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