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ICES Journal of Marine Science: Journal du Conseil 2006 63(5):946-951; doi:10.1016/j.icesjms.2005.06.012
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© 2006 International Council for the Exploration of the Sea

Interactions between Mediterranean bottlenose dolphins (Tursiops truncatus) and gillnets off Sardinia, Italy

Bruno Díaz López*

The Bottlenose Dolphin Research Institute V. A. Díaz No 4, Golfo Aranci, 07020 Sassari, Italy

*Correspondence to B. Díaz López: tel: +39 0346 0815414. e-mail: bruno_onda{at}yahoo.es.

A first attempt at analysing interactions between bottlenose dolphins and gillnets along the northeastern coast of Sardinia (Italy) was conducted between October 1999 and December 2004. A new approach was used: combining interviews with fishers with boat-based direct observations and behavioural and group size analysis. Fishers on monitored boats noted 2556 days on which gillnet damage was caused by bottlenose dolphins, 68.7% of the total fishing days, with no difference between seasons. An annual estimate of the number of bottlenose dolphins caught in the gillnets was 1.47 (0.98 immatures and 0.49 adults). In all, 317 days were spent making observations at sea, of which 330.6 h were spent directly observing the dolphins. There were no changes in the distribution of daily encounter rate among seasons, group size, or number of immatures, in the presence or the absence of gillnets. However, bottlenose dolphins spent more time both in the study area and feeding when gillnets were present. The extent of the estimated bycatch is worrisome in terms of the ability of bottlenose dolphins off Sardinia to sustain such an annual loss.

Keywords: behaviour, bottlenose dolphin, bycatch, fisheries, gillnets, Mediterranean Sea, trammel nets

Received 10 October 2005; accepted 13 February 2006.


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