Field Demonstration Test to Prevent Sweetfish From Entering the Water Intake of a Hydropower Station

Publication Date


Publication Title

Proceedings of the International Symposium on Fishways '95

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Publication Place

Gifu, Japan


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


Freshwater fishery, comprised mainly of sweetfish (Ayu in Japanese), is one of the most important industries in the mountain area in the Shikoku District. Several fisheries cooperative associations liberate sweetfish and there are problems such as liberated fishes can enter the water intake of hydropower stations and be destroyed. Hence, in order to develop an effective method to prevent sweetfish from entering at the water intake, information on the nature of sweetfish has been obtained through basic indoor experiments for two years since 1990, which proved that low frequency acoustic stimulations and air bubbles were effective preventative methods. These two methods were tested four times at Omogogawa No. 1 hydropower station and were practically effective.

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