Forma, Vol. 18 (No. 2), pp. 119-131, 2003
Original Paper

A Simulation Study on the Form of Fish Schooling for Escape from Predator

Tamon Oboshi, Shohei Kato*, Atsuko Mutoh and Hidenori Itoh

Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
*E-mail address:

(Received November 21, 2002; Accepted May 30, 2003)

Keywords: Fish Schooling, Artificial Life, Genetic Algorithm, Evading Behavior

Abstract. In this paper, on a simulation model of fish schooling considering predator's existence, we attempt an analysis of the form of school in which prey fish evades predator. We consider an evolutionary model of the fish behavior, and discuss the mechanism of schooling behavior when the school encounters with a predator. This paper then shows our computer simulation of the prey-predator system on an artificial ecology where fishes and a predator coexist, and reports well simulated prey behaviors, especially evading behaviors of the predator with advantage of schooling. On the simulation, we give an informal analysis of the transition of the form of fish school in which fishes have the evading behaviors.

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