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Vertical movement patterns of skipjack tuna (Kotsuwonus pelamis) in the eastern equatorial Pacific Ocean, as revealed with archival tags.
- Article from:
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Fishery Bulletin
- Article date:
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July 1, 2007
- Author:
- Schaefer, Kurt M.; Fuller, Daniel W.
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Copyright informationCOPYRIGHT 2007 National Marine Fisheries Service. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Abstract--Thirty-three skipjack tuna (Katsuwonus pelamis) (53-73 cm fork length) were caught and released with implanted archival tags in the eastern equatorial Pacific Ocean during April 2004. Six skipjack tuna were recaptured, and 9.3 to 10.1 days of depth and temperature data were downloaded from five recovered tags. The vertical habitat-use distributions indicated that skipjack tuna not associated with floating objects spent 98.6% of their time above the thermocline (depth = 44 m) during the night, but spent 37.7% of their time below the thermocline during the day. When not associated with floating objects, skipjack tuna displayed repetitive bounce-diving behavior to depths ...