Tracking blueﬁn tuna reproductive migration into the Mediterranean Sea with electronic pop-up satellite archival tags using two tagging procedures
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AuthorsAbascal, F.J. (Francisco Javier); Medina, A. (Antonio); Serna-Ernst, J.M. (José Miguel) de-la; Godoy-Garrido, M.D. (María Dolores); Aranda, G. (Guillermo)
KeywordsAtlantic blueﬁn tuna
Strait of Gibraltar
Thirteen adult blueﬁn tuna were tracked with elec- tronic pop-up satellite tags during their reproductive migration towards Mediterranean spawning grounds as they entered the Strait of Gibraltar. Fish were caught in tuna traps and tagged either underwater, with the aid of a modiﬁed spear gun, or on the deck of the boat. Fish tagged on board initially showed a shallower behavior than those tagged in the water. The pattern of horizontal movements was also different between both groups. Shortly after tagging, the eight ﬁsh tagged in the water entered the Mediterranean Sea. Six of these ﬁsh reached the spawning ground located south- west of the Balearic archipelago before headin g back for the Atlantic, whereas the other two traveled far- ther east, reaching its easternmost longitudes between Formentera and Sardinia and the South Tyrrhenian Sea, respectively. In contrast, two out of the ﬁve ﬁsh tagged on board never entered the Mediterranean Sea, and another one did enter ...
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