抄録
Crucian carp hooked at upper jaw was drawn by gus line at constant speed, and the tension of gut line was recorded by means of the apparatus illustrated in Fig. 1. Fig. 2 shows two examples of the records. Fig. 3 shows the magnitude of primary peak of pulling force in relation to the time interval between the primary and the succeeding secondary peaks, and we see that the speed of drawing and magnitude of primary peak have no influence on the time interval. Fig. 4 shows the magnitude of primary peak related to the body weight of fish, and we see that the magnitud of primary peak have influenced by the body weight of fish and the speed of drawing. This, it is concluded that both the primary and succeeding secondary peak are resulted by the action of fish.
