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Portable Denil and steeppass fishways (0.3m wide, 0.3m deep) were experimentally installed on a divergent weir in Okitsu river. For ascended fishes to exit of the fishways, the number of fish in Denil were six times as many as ones in steeppass and the mean body size in steeppass were greater than ones in Denil. The fishes tend to choose the region of weak secondary flow and to ascend in upward secondary flow more than downward one in steeppass that contain much air bubble. The Denil fishways have the advantage of slower flow region without air bubbles for small fishes. It is pointed out for the juvenile ayu that flow directionality related to secondary flow and vortex scale have an effect on ascending behavior in the fishways.

MIGRATORY BEHAVIOR OF JUVENILE AYU RELATED TO FLOW FIELDS IN DENIL AND STEEPPASS FISHWAYS