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KMID : 1024520200290090885
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Journal of the Environmental Sciences
2020 Volume.29 No. 9 p.885 ~ p.905
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Behavior Patterns during Upstream Migration of Chum Salmon (Oncorhynchus Keta) in the Lower Reaches of Yeon-gok Stream in Eastern Korea
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Kim Beom-Sik
Jung Yong-Woo
Jung Hae-Kun
Park Joo-Myun
Lee Cheul-Ho
Lee Chung-Il
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Abstract
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This study described the characteristics of the upstream migration of salmon (Chum salmon, Oncorhynchus keta) along Yeon-gok Stream in the eastern coastal region of Korea from October 24 to November 9, 2018 using radio tag and data storage tag loggers for the detection of the locations of tagged salmon and measurement of water temperature. Tracking experiments were conducted and classified into four types (case 1 to case 4) depending on the release time and the number of salmon tracked. Experiments from case 1 to case 3 were classified depending on the number of salmon tracked into cases in which a single tagged salmon was tracked (case 1), a pair of tagged salmon was tracked (case 2), and salmon were tracked by different sex ratios (case 3). Experiments from cases 1 to 3 were conducted between 10 AM and 1 PM, and case 4 was conducted after 3:30 PM. Salmon moved and spawned in the downstream region of the Yeon-gok, where water temperature is higher than in other rivers and salmon return in Canada, Russia, Japan, and the U.S.A. Most of the radio-tagged salmon swam in deep and shaded areas during the day but actively moved upstream close to sunset, regardless of the release time. Females showed relatively more active movements than males during upstream migration.
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KEYWORD
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Chum salmon, Radio tag, Yeon-gok stream, Migration
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