There is some evidence that the presence ofTursiops truncatus in fishing areas represents a real economicthreat to fishermen due the dolphin feeding on theentangled fish, damaging the nets and reducing the fishcatch. We have carried out experiments to assess the efficiencyof a pinger in decreasing the interaction between thedolphins and fishing nets, in a fishing area off the coast ofsouthern Italy, where Tursiops truncatus is frequentlyobserved to interact with bottom gill nets. Two identicalmonofilament bottom gill nets (900 m long), one equippedwith pingers and the other without, were used to measurethe effect of these pingers on the abundance of the catchand net damage. For each haul (58 in total), data on dolphinsightings near the nets, damage judged to have been doneby dolphins, weight and species composition of the catchwere collected. All damage to the nets were recorded at theend of each haul. Dolphins in the fishing area were sighted11 times out of 29 fishing activities (38%). The netequipped with pingers contained 28% more fish (biomass)than the net without pingers (t test, P\0.04) and was lessdamaged (-31%, t test, P\0.01). To assess whether theefficacy of these pingers remain constant over long period,long-term experiments should be carried out.
|Numero di pagine||8|
|Stato di pubblicazione||Published - 2009|
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