Scientia Marina, Vol 67, No S2 (2003)

The incidental capture of seabirds by Spanish drifting longline fisheries in the western Mediterranean Sea


https://doi.org/10.3989/scimar.2003.67s265

Julio Valeiras
Instituto Español de Oceanografía, Centro Oceanográfico de Gijón, Spain

Juan Antonio Camiñas
Instituto Español de Oceanografía, Centro Oceanográfico de Málaga, Spain

Abstract


The western Mediterranean Sea is an important fishing area for the Spanish drifting longline fleet, targeting swordfish (Xiphias gladius), bluefin tuna (Thunnus thynnus) and albacore (T. alalunga). Some seabird species can be captured incidentally as bycatch marine fauna. From July 1999 to August 2000 information on 554 surface longline sets was collected by onboard observers of the Spanish Oceanographic Institute (IEO) on 18 longline fishing boats working within the Spanish Mediterranean fishing area. Eleven yellow-legged gulls (Larus cachinnans), 9 Cory´s shearwaters (Calonectris diomedea) and 1 Northern gannet (Morus bassanus) were captured incidentally. Bycatch rates ranged from 0.002 to 0.023 birds/1000 hooks.

Keywords


incidental capture; bycatch; seabirds; drifting longline; Mediterranean

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