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First record of the at-sea swimming speed of a Pacific salmon during its oceanic migration
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 | Orientation | 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 |
URI: | http://hdl.handle.net/2115/39887 |
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)
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Submitter: 上田 宏
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