Fig 8.
(a) Example of an encounter between two Pachón fish leading to a major change of direction. (b) Fraction of the time spent in the inner half of the tank (within 39.2 cm of its center, which represents half of its area) as a function of group size in simulations including evasive maneuvers. The evasive-maneuver interaction makes fish turn away from each other when they come within half a body length (2.5 cm) of each other. If the strength ka of the interaction is small, the fish may move out of range of each other before the turn is made. Conversely, if ka is very large, each fish makes an almost-instantaneous turn to face directly away from the other fish.