底面傾斜を組み込んだ魚群行動モデル [in Japanese] A Model of Fish Behavior Towards a Water Bottom with a Gradient [in Japanese]
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This paper proposes a model of fish behavior toward a leader net set on the sea bottom with a gradient on the assumption that the force of the directional field makes the fish swim in the direction of deeper water within a range around the leader net. In a box-net with a bottom gradient in an octagonal water tank, the swimming behavior of rainbow trout <i>Oncorhynchus mykiss</i> toward the leader net was recorded with a video recorder. Bottom gradients used in the experiment were 2.5, 5.0 and 7.5 degrees. Paramenters of this model were estimated from time-series data of the position of fish using the least-squares algorithm. Observations of fish swimming in the water tank show that fish tend to swim in the deeper part of the box-net. The swimming trajectory of fish in the model simulation demonstrates the same tendency as the actual observations. Furthermore, the steeper the bottom, the larger the parameter value of the force of the directional field, demonstrating the validity of this model.
NSUGAF 63(1), 35-42, 1997-01-15
The Japanese Society of Fisheries Science