渓流用簡易魚道の開発

摘要

We developed a simple fishway as one of the techniques to reduce the run-up inhibition of spawning season for salmonids by dams installed in the mountain stream.The fishway is a folded structure and can be made of commercially materials. It took three people about one to one and half hours to install the fishway.In a test conducted in a river, salmonid fish run-up was confirmed on a 1.5 to 3 m high dam.The fishway is effective in mitigating the run-up inhibition of the spawning season by dams.