Fig. 5: Effect of familiarity on escape performance of fish schools (Chromis viridis).
From: Social familiarity improves fast-start escape performance in schooling fish

a Nearest neighbour distance (NND) denotes the distance to the closest neighbour (mm). b School area indicates the school’s horizontal spread (cm2). c Alignment is a measure of the variation in the orientation of all school members. This variable is characterised by the length of the mean circular vector (r). Each larger dot represents the mean ± s.e., with small dots indicative of individual data points (n = 24 schools, composed of 8 fish each).