Title

A Field Survey on Up-stream Migrating Fishes at Takahashi River Estuary Barrage

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

311

End Page

316

Publication Place

Gifu, Japan

Publisher

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

Abstract

We surveyed up-stream migration of fishes at Takahashi River Estuary Barrage, where the change of the tide is about 2 meters. As a result, we found the following: (1) In case of the entire overflow type barrage, partial blocking of flow has a large effect on fish attractions. (2) Ripraps below the barrage function as a resting area for up-stream migrating fishes. (3) The number of ascending Ayu and Threadfin goby are related to the tide. (4) Up-stream migration activity of Mitten crab is not related to the tide. They become active when it's dark. (5) Juvenile eels, Mitten crabs, and Long-armed shrimps are able to ascend through the area where there is no fishway. (6) For up-stream migrating fishes, the area below the barrage and the exit of the fishways are dangerous gates where large fisheaters gather.



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