Journal of the Marine Biological Association of the United Kingdom



Research Article

Movement of blue shark, Prionace glauca, in the north-east Atlantic based on mark–recapture data


Nuno  Queiroz a1c1, Fernando P.  Lima a1a2, Anabela  Maia a3, Pedro A.  Ribeiro a1a4, João P.  Correia a5 and António  M. Santos a1a2
a1 CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, Campus Agrário de Vairão, 4485-661 Vairão, Portugal
a2 Departamento de Zoologia–Antropologia, Faculdade de Ciências da Universidade do Porto, 4099-002 Porto, Portugal
a3 Universidade de Lisboa, Faculdade de Ciências, Instituto de Oceanografia, Campo Grande, 1749-016 Lisboa, Portugal
a4 School of Biological Sciences, University of Southampton, Basset Crescent East, Southampton, SO16 7PX, UK
a5 Oceanário de Lisboa, SA, Esplanada D. Carlos I—Doca dos Olivais, 1990-005 Lisboa, Portugal

Article author query
queiroz n   [Medline] [Google Scholar
lima fp   [Medline] [Google Scholar
maia a   [Medline] [Google Scholar
ribeiro pa   [Medline] [Google Scholar
correia jp   [Medline] [Google Scholar
m. santos a   [Medline] [Google Scholar

Abstract

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.

(Received March 2 2005)
(Accepted August 9 2005)


Correspondence:
c1 e-mail: nuno.queiroz@apece.pt