Estimating the impact of interactions between bottlenose dolphins and artisanal fisheries around the Balearic Islands

Jose Maria Brotons, Antonio Maria Grau, Luke Rendell

Research output: Contribution to journalArticlepeer-review

78 Citations (Scopus)

Abstract

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 similar to 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.

Original languageEnglish
Pages (from-to)112-127
Number of pages16
JournalMarine Mammal Science
Volume24
Issue number1
Early online date8 Nov 2007
DOIs
Publication statusPublished - Jan 2008

Keywords

  • fisheries interactions
  • bycatch
  • bottlenose dolphin
  • Tursiops truncatus
  • TURSIOPS-TRUNCATUS
  • MEDITERRANEAN SEA
  • KILLER WHALES
  • ORCINUS-ORCA
  • SPERM-WHALES
  • WATERS
  • PREY

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