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Fig. 7. Regions around a cylinder in flow that trout will either entrain (defined
as two rectangular regions on either side of the cylinder, 7x15 cm) or
Kármán gait (defined as a single rectangle centered along the
midline of the cylinder wake, 10x15 cm). In the light, fish prefer to
Kármán gait in the vortex street downstream from the cylinder
(black fill) for the majority of the time during a 60-min experiment,
especially when the lateral line is intact (V+L+1). Values for fish
in the light with an intact lateral line exposed to the cylinder for two
consecutive days (V+L+2) are almost identical to those exposed for
1 day (V+L+1), indicating that previous experience in the flow tank
does not alter the preference to Kármán gait. In contrast to
their reaction in the light, fish in the dark do not spend much time in the
vortex street regardless of lateral line functionality (V–L+1
or V–L–2), preferring to entrain (gray fill) just
downstream and to the side of the cylinder. The time that fish spent exploring
other regions of the flow tank (white) is similar across treatments.
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