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Fig. 5. Visualization of the dorsal fin wake during steady swimming at 1.0
L s–1 by rainbow trout. The frontal-plane light
sheet is at position 1 (Fig.
1A), intersecting the middle of the dorsal fin, which is erected
at this speed (see Fig. 2A);
all other conventions follow those of Fig.
4. Note the continuous trail of vortex centers over the body, a
wake morphology that stands in contrast to the discrete, bilaterally
positioned vortex pairs observed at 0.5 L s–1
(Fig. 4). Free-stream velocity
of 19.4 cm s–1 has been subtracted from the vector field. The
white arrow shows the direction of dorsal fin movement. Yellow scale arrow, 10
cm s–1; white scale bar, 1 cm.
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