Fig. 4. Fish with a blocked lateral line have a lower maximum body curvature than fish with an intact lateral line. The x axis (from left to right): experiments in the light with lateral line intact for the first day of cylinder exposure (V+L+₁); the same experiments with fish exposed to the cylinder on two consecutive days (V+L+₂, see Materials and methods); experiments in the dark (gray fill) with lateral line intact on the first day (V–L+₁); experiments in the light with lateral line blocked on the second day (red box, V+L–₂); and experiments in the dark with lateral line blocked on the second day (gray fill and red box, V–L–₂). Gray lines connect treatments that are significant at P<0.05. Values for control fish that were exposed to the cylinder for one (V+L+₁) and two consecutive days (V+L+₂) are statistically the same, illustrating that fish do not alter swimming kinematics as a result of previous exposure to the experimental setup. All values reported are mean ± s.e.m., N=16 tail-beats for four fish, where L is the total length of the fish.