Abstract
In this study, the authors consider fish behavior in a rocky ramp fishway with a transverse slope. As the efficiency of a fishway mainly depends on the structure (shape, bottom slope, ruffle size) and hydraulics (velocity, depth), these matters were inspected using a small open channel.
As the results, 1) in spite of discharge is not so large, higher migration rate is shown. In this case, the region in where the velocity is suited for the run-up of fish, is formed easily. 2) Tribolodon hakonensis can find a convenient flow for their migration, and in this case Tribolodon hakonensis can take a rest easily for a while in the channel, because flows with various velocities appeared in the cross section of fish way. 3) In addition, total run up time becomes longer. 4) If Tribolodon hakonensis stays for a longer time in the fish way, it invites more danger from attack by birds and another fish, in the rocky ramp fishway with transverse slope. 5) Therefore, it needs to consider on the more efficiency and safety for fishway.
