Scientia Marina, Vol 71, No 2 (2007)

Interactions between small cetaceans and the purse-seine fishery in western Portuguese waters

Laura Wise
INIAP-IPIMAR, Lisboa, Portugal

Alexandra Silva
INIAP-IPIMAR, Lisboa, Portugal

Marisa Ferreira
Instituto da Conservação da Natureza, Lisboa, Portugal

Mónica A. Silva
Departamento de Oceanografia e Pescas, Horta, Portugal

Marina Sequeira
Instituto da Conservação da Natureza, Lisboa, Portugal


Marine mammal interactions with Portuguese purse-seine fisheries operating in four different ports (Figueira da Foz, Sesimbra, Setúbal, Sines) were studied (July-October 2003). Observers accompanied commercial fishing vessels and monitored 48 fishing trips. An interview survey of skippers was also carried out (n = 36). Three species of marine mammals were observed in 31 sightings during the commercials trips but only the species Delphinus delphis and the category Delphinidae were observed to interact with fishing activities. Small cetaceans were observed to sink, gather or disperse school fishes and damage gear. Mean CPUE and fishing effort values did not change significantly in the presence of dolphins (H = 0.06 and H = 0, both p>0.05). Results from Figueira da Foz indicate that cetaceans are attracted to fishing grounds with a high abundance of their prey-species. Fishermen reported three by-catch events off Figueira da Foz. Compared with other fisheries, purse-seine fishing does not seem to be among the most damaging to marine mammals.


purse-seine; fishing activity; marine mammals; interaction

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