Quantitative distribution of fishes in the upstream and downstream of a reservoir

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Fish faunae in the upper and the lower streams of the Kanogawa Reservoir in the Hijikawa River system, Ehime Prefecture, Shikoku, were quantitatively investigated mainly by diving observation in August, 1960. 27 species of the fish were listed from these streams. In the upper stream of the reservoir, a pale chub Zacco temmincki predominated in number and its density was 0.62 per square meter in the upper part of the research area, while a dark chub Z. platypus was extremely abundant and amounted to 4.65 per square meter in density in the neighbourhood of the reservoir. In the lower stream of the reservoir, . adult and subadult of Z. platypus predominated in number throughout the research area and they were the largest in number in the rapid, but their maximum density was 1.33 per square meter. This species was quite absent throughout the river system before the construction of the reservoir, though Z. temmincki was rather abundant in the lower stream too. The latter species was the largest in number in the pool, especially near the bank with deep water. A salmon-like fish, Ayu, Plecoglossus altivelis was the most abundant in the rapid. of the lowerstream of the reservoir, especially in the part just below the dam. The largest density of this species was 0.88 per square meter. 95% fiducial ranges of the mean of the total body length of P. altivelis in the lower stream were 16.5-16.7 cm and 18.0-18.4 cm in the two stations near the dam and 15.8-16.0 cm throughout the research area. These values were statistically significantly small as compared with the mean total body length of this species obtained from the same area and in the same season about two years before the construction of the reservoir.
日本魚類学会の論文

Quantitative distribution of fishes in the upstream and downstream of a reservoir

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日本魚類学会 | 論文

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