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movement of blue shark, prionace glauca , in the north-east atlantic based on mark–recapture data

2005; Cambridge University Press; Volume: 85; Issue: 5 Linguagem: Inglês

10.1017/s0025315405012154

1469-7769

Nuno Queiroz, Fernando P. Lima, Anabela Maia, Pedro A. Ribeiro, João P.S. Correia, António M. Santos,

Fish Ecology and Management Studies

a shark tagging programme along the portuguese coast was initiated in 2001 in collaboration with the national marine fisheries service. from a total of 168 blue sharks ( prionace glauca ) tagged, 34 sharks were recaptured (20% return rate) providing important information on this species' movement patterns for the area. a total of 28 sharks travelled less than 1000 km while at liberty for time periods ranging from 22 to 1294 days. the remaining fish travelled long distances to north-west africa, central atlantic and the bay of biscay. only one shark made a transatlantic migration, being recaptured 3187 km from the tagging site. north–south movements seem to be related to seasonal sea-surface temperature variation in the north-east atlantic. seasonal segregation of different life stages also occurs.