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Fig. 7. Visualization of the dorsal fin wake during a slow turn at 0.5 L
s–1 by rainbow trout. The frontal-plane light sheet is at
position 2 (Fig. 1A), and
vectors overlying the body have been deleted; the dorsal fin is visible to the
left and the adipose fin to the right. This image shows the dorsal fin soon
after it has reached maximal excursion to the right of the body and has begun
the return stroke toward the midline (indicated by the white arrow pointing to
the left of the body). Unilateral dorsal fin abduction results in the
well-developed vortex with clockwise rotation and the strong laterally
directed jet. During the return stroke, the counterclockwise member of the
vortex pair develops, the wake jet is strengthened and the fish's body yaws to
the left. Free-stream velocity of 8.5 cm s–1 has been
subtracted from the vector field. Yellow scale arrow, 10 cm
s–1; white scale bar, 1 cm.
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