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Fig. 7. Simultaneous dorsal and anal fin jet development in brook trout manoeuvring
at 0.5 L s-1. The fish is manoeuvring away from the
stimulus located beyond the top of each image. (A) Dorsal fin at peak
amplitude. (B) Dorsal fin peak jet velocity. The peak jet formation by the
dorsal fin occurs just after maximum kinematic excursion with less phase lag
than that seen in steady swimming. (C) Anal fin at peak amplitude and jet
velocity. There is no phase lag between peak amplitude and peak jet velocity.
Note that the pelvic fins appear as paired bright circular regions in the
dorsal view because they intersect the ventral light sheet and reflect light
into the dorsal camera. Similar pelvic fin reflections can be seen in the
dorsal views shown in Fig. 6.
Note that x and y axes represent the scale of the video
image.
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