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Upstream migration of adult chum and pink salmon in the Shibetsu River

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タイトル: Upstream migration of adult chum and pink salmon in the Shibetsu River
著者: Makiguchi, Y. 著作を一覧する
Nii, H. 著作を一覧する
Nakao, K. 著作を一覧する
Ueda, H. 著作を一覧する
キーワード: Migratory behavior
Electromyogram (EMG)
DT logger
Meandering reconstruction
発行日: 2007年 5月
出版者: Springer
誌名: Hydrobiologia
巻: 582
号: 1
開始ページ: 43
終了ページ: 54
出版社 DOI: 10.1007/s10750-006-0555-8
抄録: The migratory behavior and swimming patterns of anadromous upstream migratory fish have been poorly described in the Shibetsu River in eastern Hokkaido, Japan. In this 2004 study, we used electromyogram (EMG) transmitters and depth/ temperature (DT) loggers to compare the upstream migratory behavior of adult male chum salmon (Oncorhynchus keta) and pink salmon (O. gorbuscha) in the canalized and reconstructed segments of the Shibetsu River, where a part of canalized section was preliminary reconstructed meander to restore a more natural section. The EMG transmitter and DT logger were externally attached to the left side of the body, below the front edge of the dorsal fin. Fish of both species often migrated along the riverbanks and near the bottom of the water column, sometimes engaged in holding behavior, which was defined as cessation of swimming during their upstream migration for 5 minutes. Modal swimming depth calculated by DT loggers for chum salmon (0.2–0.4 m) was shallower than pink salmon (0.6–0.8 m). Further, modal swimming speeds measured by calibrated EMG for chum salmon (0.2–0.4 BL s−1) were slower than pink salmon (1.2–1.4 BL s−1). Pink salmon swam faster as well as in relatively deeper than chum salmon, suggesting that they expend more energy than chum salmon in the reconstructed segment. Based on these results, it seemed likely that the upstream migration behavior of chum and pink salmon was different with species-specific strategies.
Rights: The original publication is available at www.springerlink.com
資料タイプ: article (author version)
URI: http://hdl.handle.net/2115/22080
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 牧口 祐也

 

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