Title

Fish Swimming Behaviour in Finnish Fishways

Authors

A Laine

Publication Date

1995

Publication Title

Proceedings of the International Symposium on Fishways '95

Start Page

323

End Page

328

Publication Place

Gifu, Japan

Publisher

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

Abstract

While ascending towards a dam salmon (Salmo salar) and brown trout (S. trutta) follow the main flow. According to our observations, it usually takes two weeks until they swim from the turbine flow into the fishway. They often seem to need to get acquainted with the fishway entrance and its flow. While ascending, trout has been measured to spend 1-3 minutes per pool. The ascent tends to speed up further on the fishway. For small coregonids (Coregonus sp.), resting in pools is essential. The velocities of the best resting areas correspond with 1/2-1 BL/s in fishways and in natural rapids. Lamprey (Lampetra fluviatilis) has had difficulties in ascending the vertical slot and Denil fishways.

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