Abstract
A mathematical model is presented in order to investigate the problems of fish behavior in relation to fishing gear using the technique of computer simulation. The fundamental equations of motion are described by regarding the motion of a fish as that of a particle. The equations of motion contain the fundamental elements of fish behavior such as mass, drag coeffcient and external forces acting on the fishes. As external forces, the following six forces are introduced: propulsive force, interactive force, schooling force, repulsive force against wall, directional force and random force. The computer simulation is carried out by solving a system of the nonlinear difference equations by means of TSS (Time Sharing System). The position of each individual is plotted as a result of the computer experiment in oredr to check the propriety of the model. The moving patterns of fishes obtained by the simulation are quite similar to actual behavior of fish school. It was shown that the model is suitable for investigating fish behavior in relation to fishing gears.
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