Deep diving behavior observed in yellowfin tuna (Thunnus albacares)
| Type | Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Date | 2006 | ||||||||
| Language | English | ||||||||
| Author(s) | Dagorn Laurent1, Holland Kim N.2, Hallier Jean-Pierre3, Taquet Marc4, Moreno Gala5, Sancho Gorka6, Itano David7, Aumeeruddy Ryaz8, Girard Charlotte1, Million Julien2, Fonteneau Alain9 | ||||||||
| Affiliation(s) | 1 : IRD, Victoria, Seychelles. 2 : Univ Hawaii, Hawaii Inst Marine Biol, Kaneohe, HI 96744 USA. 3 : IOTC, Reg Tuna Tagging Project Indian Ocean RTTP IO, Victoria, Seychelles. 4 : IFREMER, Le Port 97822, Reunion. 5 : AZTI Tecnalia, Unidad Invest Marina, Sukarrieta 48395, Spain. 6 : Coll Charleston, Grice Marine Lab, Charleston, SC 29412 USA. 7 : Univ Hawaii, Pelag Fisheries Res Program, Honolulu, HI 96822 USA. 8 : Seychelles Fishing Author, Victoria, Seychelles. 9 : IRD, CRHMT, F-34203 Sete, France. |
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| Source | Aquatic Living Resources (0990-7440) (EDP Sciences), 2006 , Vol. 19 , N. 1 , P. 85-88 | ||||||||
| DOI | 10.1051/alr:2006008 | ||||||||
| WOS© Times Cited | 44 | ||||||||
| Keyword(s) | Indian ocean, Yellowfin tuna, Swimming speed, Diving behavior, Vertical movements, Archival tap | ||||||||
| Abstract | 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 lerriperatt.11-CS no more than 8 degrees 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 ail anchored fish aggregating device (FAD) in the Seychelles (Western Indian Ocean) was equipped with all 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 in (maximum thermocline depth experienced by the fish) but, over the Course of the track, it performed three deep dives to 578 in, 982 In and 1160 In. Minimum ambient water temperatures recorded Lit these depths were 8.6 degrees C, 7.4 degrees C and 5.9 degrees C respectively and varied by up to 23.3 degrees C from surface temperatures. The fish spent 8.3% of its time in waters more than 8 degrees C colder than the surface layer and daily experienced a wide range of sea temperatures (mode at 15- 16 degrees C) and of temperatures of the gut cavity (mode at 6 degrees C). The reason for these dives call not be known. These depths and temperatures significantly exceed those reported ill the literature so far and clearly demonstrate that this species has the physiological and behavioral ability to penetrate deep cold sections of the ocean. | ||||||||
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