Title

The Fishway for the Downstream Migration of Ayu Larvae

Authors

H Hidaka

Publication Date

1995

Notes

Title, abstract, and figure legends in English, remainder of text in Japanese

Publication Title

Proceedings of the International Symposium on Fishways '95

Start Page

437

End Page

441

Publication Place

Gifu, Japan

Publisher

The Organizing Committee for International Symposium on Fishways '95 in Gifu

Abstract

Spawning of Ayu, Plecoglossus altivelis, downstream migration of larvae and upstream migration of juveniles were investigated in the Murasaki River, Kitakyushu. It became clear that the number of downstream larvae at the fishway of the weir for industrial use were very few; their ratios to the number of downstream larvae at the point of just under the spawning ground were ranged from 1,1% to 2.5% (mean 1.8%, n=4). Because the density of larvae in the bottom water layer at the weir was distinctly higher than that in the surface, the fishway equipped with slide gate dischargeable the bottom water is necessary.

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