Pinger affects fish catch efficiency and damage to bottom gill nets related to bottlenose dolphins |
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| Authors: | Giuseppa Buscaino Gaspare Buffa Gianluca Sarà Antonio Bellante Jr" target="_blank">Antonio Josè TonelloJr Fernando Augusto Sliva Hardt Marta Jussara Cremer Angelo Bonanno Angela Cuttitta Salvatore Mazzola |
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| Institution: | 1.U.O. di Capo Granitola dell’Istituto per l’Ambiente Marino Costiero, Consiglio Nazionale delle Ricerche,Granitola,Italy;2.Dipartimento di Ecologia,Università di Palermo,Palermo,Italy;3.Dipartimento di Scienze Ambientali,Università Cà Foscari,Venice,Italy;4.Dipartimento di Biologia Animale e dell’Uomo,Università di Torino,Torino,Italy;5.Laboratório de Nectologia, Departamento de Ciências Biológicas,Universidade da Regi?o de Joinville,S?o Francisco do Sul,Brazil |
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| Abstract: | There is some evidence that the presence of Tursiops truncatus in fishing areas represents a real economic threat to fishermen due the dolphin feeding on the entangled fish, damaging the
nets and reducing the fish catch. We have carried out experiments to assess the efficiency of a pinger in decreasing the interaction
between the dolphins and fishing nets, in a fishing area off the coast of southern Italy, where Tursiops truncatus is frequently observed to interact with bottom gill nets. Two identical monofilament bottom gill nets (900 m long), one equipped
with pingers and the other without, were used to measure the effect of these pingers on the abundance of the catch and net
damage. For each haul (58 in total), data on dolphin sightings near the nets, damage judged to have been done by dolphins,
weight and species composition of the catch were collected. All damage to the nets were recorded at the end of each haul.
Dolphins in the fishing area were sighted 11 times out of 29 fishing activities (38%). The net equipped with pingers contained
28% more fish (biomass) than the net without pingers (t test, P < 0.04) and was less damaged (−31%, t test, P < 0.01). To assess whether the efficacy of these pingers remain constant over long period, long-term experiments should be
carried out. |
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| Keywords: | Bottom gill nets Depredation Dolphin– fishery interaction Mediterranean Pinger Tursiops truncatus |
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