The effect of the river inhabiting fish on burst swimming performance in various flow.

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The authors conducted a field swimming experiment using cultured fingerling masu salmon (Oncorhynchus masou masou) and Japanese char (Salvelinus leucomaenis) employing a stamina tunnel in order to determine the burst swimming performance speed of masu salmon and Japanese char when swimming upstream in a fishway. Measurements were taken during the swimming experiment using a high-speed camera. The experiment determined the relationship between movement of tail beat and swimming speed when these fishes swim upstream at high speed. The authors also conducted an experiment on the swimming speed of ice goby (Leucopsarion petersi) using the stamina tunnel in the river in which the ice goby swam upstream. This experiment was the first time in Japan that the swimming curve of ice goby was determined.