Self-organized aggregation–dispersion dynamics in schooling fish

Abstract The collective behaviour of fish can promote the propagation of social information within the group, benefiting the individuals within the group. The self-organized aggregation–dispersion dynamics in the collective movement of fish schools are investigated using experimental data obtained from a ring-shaped tank under varying group sizes. We measure group cohesion, aggregation–dispersion scale (cohesion fluctuations), duration of aggregation–dispersion movements, correlations of individ