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Fig. 9. Dorsal–caudal fin kinematic phase relationship and hydrodynamic
interaction in rainbow trout. (A–D) Dorsal-view video frames showing
mediolateral excursion of the trailing edge of the soft dorsal fin and the
leading edge of the tail during steady swimming at 1.0 L
s–1. (E) Corresponding plot of dorsal and caudal fin motion
versus time for approximately two fin beat cycles showing that
mediolateral oscillation of the tail is approximately one-quarter cycle out of
phase with that of the dorsal fin. (F) Path of the caudal fin's leading edge
(red dots) plotted over the course of one tail beat cycle and shown in
relation to the wake of the dorsal fin within the frontal (XY) plane
(position 2, Fig. 1A) at 1.0
L s–1. At this speed, the tail passes directly
through the centers of the dorsal fin vortices and experiences an incident
flow whose velocity exceeds that of the free-stream by 3%. Free-stream
velocity of 18.0 cm s–1 has been subtracted from the vector
field.
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