Notes on the biology of juvenile masu salmon (<I>Oncorhynchus masou</I>) during winter in the Chihase River, Hokkaido
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概要
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1. The biology of juvenile masu salmon (<I>Oncorhynchus masou</I>) during winter was investigated in the Chihase River which enters into Japan Sea, in southern Hokkaido, from the 13th to the 15th of December, 1967.<BR>2. In the Chihase River system, juvenile masu salmon exhibited a tendency to gather in the tributary (Hiyamizunosawa) in which the water temperature is comparatively high during winter.<BR>3. As the result of the examination of stomach contents, it appeared that juvenile masu salmon ate larvae and nymphs of aquatic insects including Ephemeroptera, Trichoptera, Plecoptera and Diptera during winter.<BR>4. The feeding behavior of O-year fish was more active than that of 1-year fish. Therefore, the ecology of juvenile masu salmon during winter seemed to differ by age group.
- 日本陸水学会の論文
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