網地の縮結と魚群の網目の通過に就て-II

概要

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This experiment have been studied on behaviour of fish school, to make certain of how fish pass through the mesh of various shortening nets which move along constant velocity of 0.1 Meter/second in a long tank filled up by water. (Fig. 1) In this study, Carp (Cyprinus carpio, LINNÈ) have been used. The results is shown in table 1, and it will be manifested by formulae (1), (2) which had been reported formerly by the author. (Fig. 2). But the probability of chi-square is smaller than the results formerly reported. Then, the value of goodness of fit show the maximum at the case of 7.5cm in mesh size and it has same tendency to the results formerly reported. Therefore, it can be assume that there is the some effective mesh size on fishes. It have been observed that the fish pass through the mesh of net without touching the body, even the fish pass from the tail through the mesh except the shortening of net, is near to the S1 or S2. From the above mentioned, it may be certain that the fishes recognize the position or shape of the mesh approaching behind them.
公益社団法人日本水産学会の論文