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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Deep diving behavior observed in yellowfin tuna (Thunnus albacares)
Aquatic Living Resources, Volume 19, No. 1, Year 2006
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Description
Yellowfin tuna (Thunnus albacares) are known to preferentially occupy the surface mixed layer above the thermocline and it has been suggested that they are physiologically restricted to water temperatures no more than 8°C colder than surface waters. However, we here report for dive data acquired from a large yellowfin tuna which demonstrate for the first time that this species is indeed capable of making prolonged dives into deep cold waters. A yellowfin tuna (134 cm fork length) caught near an anchored fish aggregating device (FAD) in the Seychelles (Western Indian Ocean) was equipped with an internally implanted archival tag and released. The fish was recaptured 98 days later. As predicted for this species, this fish spent 85% of its time shallower than 75 m (maximum thermocline depth experienced by the fish) but, over the course of the track, it performed three deep dives to 578 m, 982 m and 1160 m. Minimum ambient water temperatures recorded at these depths were 8.6°C, 7.4°C and 5.8°C respectively and varied by up to 23.3°C from surface temperatures. The fish spent 8.3% of its time in waters more than 8°C colder than the surface layer and daily experienced a wide range of sea temperatures (mode at 15-16°C) and of temperatures of the gut cavity (mode at 6°C). The reason for these dives can not be known. These depths and temperatures significantly exceed those reported in the literature so far and clearly demonstrate that this species has the physiological and behavioral ability to penetrate deep cold sections of the ocean. © EDP Sciences, IFREMER, IRD 2006.
Authors & Co-Authors
Dagorn, Laurent C.
Seychelles, Dakar
Ird
Holland, Kim Nicholas
United States, Kaneohe
Hawaiʻi Institute of Marine Biology
Hallier, Jean Pierre
Seychelles
Regional Tuna Tagging Project - Indian Ocean (rttp-io)
Taquet, Marc
France, Plouzane
Ifremer Institut Francais de Recherche Pour L'exploitation de la Mer
Moreno, Gala
Spain, Derio
Azti Fundazioa
Sancho, Gorka
United States, Charleston
College of Charleston
Itano, David George
United States, Honolulu
University of Hawaiʻi at Mānoa
Aumeeruddy, Riaz
Seychelles
Seychelles Fishing Authority
Girard, Charlotte
Seychelles, Dakar
Ird
Million, Julien
Seychelles
Iotc
Fonteneau, Alain
France, Marseille
Ird Institut de Recherche Pour le Developpement
Statistics
Citations: 77
Authors: 11
Affiliations: 10
Identifiers
Doi:
10.1051/alr:2006008
e-ISSN:
17652952
Research Areas
Environmental
Study Locations
Seychelles