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Fig. 3. Body wavelength, body wave speed, and lateral amplitude along the body for
all treatments, where L is the total length of the fish. 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 statistically 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. (A)
Body wavelength and (B) speed of propagation down the body are statistically
higher when the lateral line is blocked and tend to increase in magnitude and
variance in the dark. (C) Lateral body amplitudes were measured relative to
the midline at three locations. Circles represent the tail tip, squares
represent the center of mass (COM), and triangles represent the snout. The
tail tip and COM amplitudes for fish in the dark with a blocked lateral line
(V–L–2) are significantly lower than control fish on
day 1 (V+L+1) and 2 (V+L+2), as well as for fish in the
dark with an intact lateral line (V–L+1). All values are mean
± s.e.m., N=16 tail-beats for four fish.
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