Study of the blue whiting movements around the Bay of Biscay using acoustic methods
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AuthorsCarrera, P. (Pablo); Meijide-Cameselle, M. (Manuel); Porteiro-Lago, C. (Carmen); Miquel-Batle, J. (Joan)
Bay of Biscay
During March–April 1994 and 1996 two cruises were carried out around Bay of Biscay in order to study movements of blue whiting using acoustic methods. These cruises consisted in a double coverage of an area from 47°30′N, 7°15′W to 43°30′N, 6°30′W along the French and Spanish continental shelf-break (200–1000 m isobaths). Changes in spatial structure, abundance estimation, age structure and maturity stages have been analysed in each survey and coverage. Blue whiting is known as an important migratory species in the North Atlantic. By February/March, adult fish are concentrated around Porcupine Bank where they spawn. After this, it is believed that the fish migrate northward. From this study, rapid changes in both number of fish and population structure of blue whiting are clear. In 1994 the age structure was found and the differences in maturity stages together with an increasing in fish abundance from the first to the second leg, could indicate a southward movement after the spawning ...