魚の体型の違いによる遊泳速度と尾部の振動数との関係

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The previous paper discussed the swimming speed of fish in relation to the size and frequency of tail beating and was investigated with simple hydrodynamic modeis measured wity rainbow trout. It became clear that the swimming speed depended on the freqnency of the tail beating, the fish size and body type. The general equation of the formula was V=KL(F-ƒ0)+V0, where V is the speed of swimming fish, F the frequency of tail beating, V0 the minimum speed of swimming at the minimum frequency of tail beating ƒ0, L the total lengty of the fish, K the coefficient of the body type that depends on the frontal area (S1) of the fish and lateral area (S2) of the fish from the center of the mass to the tip of the fail. As we can express this coefficient K as a function of S1 and S2, K=0.40√S22/S11. In this paper, the center of mass, frontal area (S1) and lateral area (S2) of the fish were measured on various fishes ot different body types, and the coefficient K was calculated respectively. The coefficient K was 1.08, 1.04 for flat fish and saury, and 0.72 for rock fish. value. The other fishes measured in this study have about the same oredr value of 0.8-0.9. A close agreement between the experimental value K by Hunter and Zweifel and the calculated value K by this study was obtained for mackerel.
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