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Fig. 2. Tail-beat frequency, maximum head angle and downstream head distance from
the cylinder for all treatments. 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. By controlling for prior experience to the experimental
setup, kinematic comparisons made between treatments reflect the
presence/absence of visible light and the ability to sense flow with the
lateral line. (A) Tail-beat frequency does not differ significantly across
treatments, though there is a tendency for fish with a blocked lateral line to
exhibit slightly higher tail-beat frequencies and variability. (B) Maximum
head angles do not differ significantly across treatments, but fish in the
dark tend to exhibit slightly larger head angles regardless of lateral line
functionality. (C) Fish with a blocked lateral line hold station further
downstream from the cylinder than fish with an intact lateral line in the
dark, where station-holding is measured as the distance from the tip of the
snout to the downstream edge of the cylinder (where L is the total
length of the fish). Within lateral line treatments, there is a tendency for
fish in the dark to hold station further downstream from the cylinder. All
values are mean ± s.e.m., N=16 tail-beats for four fish.
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