Abstract
A fish school is considered as a typical example of autonomous decentralized system existing in nature, because it often shows a high degree of cooperation in the absence of a leader. In this paper simulation and analysis of the behavior of a fish school are made for the case where the school is affected by a trap. A specific order of the school is established based on the environmental effect and the information exchange among the school members. The relationship between the order of the school and the quantity of the information exchange is investigated by using two fish behavior models; a homogeneous cooperative school model and a heterogeneous repulsive school model. The different moving patterns are found as the simulation results by changing the quantity of information exchange for two types of fish bahavior models. It is also found that the emergence condition of cooperation is related to the system diversity.
