COMPARISON OF EFFECTS OF VELOCITY ON SWIMMING BEHAVIOR OF AYU BY NUMBER CHANGE

Abstract

 Partridge showed that a group was formed of three or more and the leader did not exist. However, swimming behavior of changing the number of fish in running water has not been investigated. In this study, the swimming behavior of isolated or couple or trio or quintet or dectet of ayu in running water was investigated. It was found that the top change rate, the ground speed and swimming speed increases with an increase of the number of fish and also that the ground distance and swimming distance decreases with an increase of the number of fish. And, it was found that the change for swimming behavior of ayu became slow of three or more.