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Fig. 6. Visualization of the dorsal fin wake during steady swimming at 2.0
L s–1 by rainbow trout. The frontal-plane light
sheet is at position 2 (Fig.
1A), intersecting the middle of the dorsal fin (at left), which is
depressed at this speed (see Fig.
2C). The caudal fin is visible at the far right; all other
conventions follow those of Fig.
4. Note the absence of vortex centers and fluid jets; background
turbulence dominates the dorsal fin wake at this speed. This wake morphology
contrasts sharply with the strong dorsal fin vortices and propulsive jets
observed at lower swimming speeds (Figs
4,
5). Free-stream velocity of
38.4 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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