EMG telemetry studies on upstream migration of chum salmon in the Toyohira river,Hokkaido, Japan |
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| Authors: | Yuya Makiguchi Yoshifumi Konno Koji Konishi Koji Miyoshi Taku Sakashita Hisaya Nii Katsuya Nakao Hiroshi Ueda |
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| Institution: | (1) Division of Biosphere Science, Graduate School of Environmental Science, Hokkaido University, Sapporo Hokkaido, 060-0809, Japan;(2) Faculty of Fisheries Sciences, Hokkaido University, Hakodate 041-8611, Japan;(3) Hokkaido Aquaculture Promotion Corporation, Chuo-ku, Sapporo Hokkaido, 060-003, Japan;(4) Field Science Center for Northern Biosphere, Hokkaido University, Sapporo Hokkaido, 060-0809, Japan;(5) Present address: College of Bioresource Sciences, Nihon University, Fujisawa Kanagawa, 252-8510, Japan; |
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| Abstract: | The movements of 28 adult chum salmon, Oncorhynchus keta (Walbaum) tagged with electromyogram (EMG) transmitters were tracked along the Toyohira river, Hokkaido, Japan, in October
of 2007 and 2008 to investigate and evaluate the upstream migratory behavior through the protection bed and fishway of ground
sills. The approach time of fish that ascended successfully through the protection bed and fishway was shorter than that of
unsuccessful fish. The unsuccessful fish were observed to swim in currents with high water velocity and shallow water depth
at swimming speeds that exceeded their critical swimming speed (U
crit) during the approach to these structures. In consequence, unsuccessful fish frequently alternated between burst and maximum
sustained speeds without ever ascending the fishway, and eventually became exhausted. It is important that fishway are constructed
to enable chum salmon to find a passage way easily, so that they can migrate upstream rapidly without wasting excessive energy. |
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