Fig 2. Effects of light intensity on the burst-and-coast swimming of a single fish.

a Probability density function (PDF) of the duration between two consecutive kicks τ, b PDF of the distance traveled by a fish between two kicks l, c PDF of the maximum speed when the fish performs a kick v₀, at different light intensities: 0.5, 1, 1.5, 5, and 50 lx (from dark to light blue). d Average duration between two consecutive kicks 〈τ〉, e average distance traveled by a fish between two kicks 〈l〉, and f average speed when the fish performs a kick 〈v₀〉, as functions of light intensity. Solid circles are the average values on all experiments; error bars represent the standard error. Red dashed lines show the trend of the average value with the light intensity.