レーザー体長計測法からの産卵回帰ヒメマス遡上馬力の試算

抄録

To calculate swimming horsepower (Fps) of spawining migrated kokanee, Oncorhynchus nerka, going up stream, the author applied the method which had been developed for measuring body length of a fish using an underwater video camera attached with a laser discharge equipment. Relation between the time required to go up a distance of 1 m (T) and swimming horsepower was expressed as a regression equation of log Fps=1.785-1.187 log T. The regression curve was similar to the one reported by Yonemori. Although the Fps value was small, it seems that the fish required more horsepower to move up a certain distance in a shorter time period. This method which is based on measuring the body length of fish can be applied to estimate swimming speed of fish and design a fish way.