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First record of the at-sea swimming speed of a Pacific salmon during its oceanic migration

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Title: First record of the at-sea swimming speed of a Pacific salmon during its oceanic migration
Authors: Tanaka, Hideji Browse this author
Naito, Yasuhiko Browse this author
Davis, Nancy D. Browse this author
Urawa, Shigehiko Browse this author
Ueda, Hiroshi Browse this author
Fukuwaka, Masa-aki Browse this author
Keywords: Chum salmon
Oceanic migration
Swimming speed
Time allocation
Foraging behavior
Issue Date: 28-Apr-2005
Publisher: Inter-Research
Journal Title: Marine Ecology Progress Series
Volume: 291
Start Page: 307
End Page: 312
Publisher DOI: 10.3354/meps291307
Abstract: The swimming behavior of the chum salmon Oncorhynchus keta was studied for 53 d of its 67 d oceanic migration from the central Bering Sea to the Japanese coast. We provide the first data on swimming speeds by a homing salmon, recorded at 5 s intervals by a fish-borne time-speed, depth, and temperature logger. Swimming speed rarely exceeded 1.0 m s^[-1], and horizontal swimming speed was 36.4 ± 15.2 km d^[-1]. Cumulative horizontal swimming distance was approximately 2500 km, equivalent to 90% of the minimum distance between the release and recovery sites (2760 km). Swimming depth and speed peaked around dawn and dusk, and there was a smaller peak around midnight. The fish showed sequential up-and-down movement near the thermocline during daytime. Diurnal patterns of movement suggest that homing chum salmon spend a considerable time foraging, and the strategy is different between daytime and nighttime. Our findings indicate that over large distances of ocean, a homing salmon maintains a strong homeward orientation, but that passive transport by favorable water currents may help the migration.
Rights: © 2005 Inter-Research
Type: article
Appears in Collections:北方生物圏フィールド科学センター (Field Science Center for Northern Biosphere) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 上田 宏

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