ウグイの水槽実験デ-タによる魚群行動モデルの考察

概要

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Matuda-Sannomiya's fish behavior model has been improved mainly on the basis of the experiment for rose bitterling Rhodeus ocellatus ocellatus. The model was reexamined for the behavior of Japanese dace Tribolodon hakonensis in a water tank experiment. The behavior of Japanese dace in a 1.7m equilateral octagonal water tank was recorded on video using 4 TV cameras which covered the whole area of the tank. On the basis of these time series data, the parameters included in the model were determined by the method of the least squares algo-rithm. However, some physical contradictions were observed in the parameters. This paper presents a modified model for describing the behavior of Japanese dace. In the new model, the interactive force between the fish and the attractive force of the wall were modified. The parameters in this model were suited, and the whiteness test of the residual was passed. The simulation by the modified model showed close agreement with the swimming behavior of Japanese dace.