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Fig. 8. Schematic summary of dorsal-fin vortex wake patterns observed in rainbow
trout during steady swimming (A,B) and turning (C), compared with previously
described patterns in bluegill sunfish performing similar steady swimming and
turning behaviors (D,E) (sunfish data from
Drucker and Lauder, 2001a).
Turning behavior in both species was initiated during steady swimming at 0.5
L s–1. Line drawings of the fishes are not precisely
to scale (although individuals of both species were approximately 20 cm in
total length). The soft dorsal fin is shown in red and the cores of associated
wake vortices are represented by curved arrows (note that the counterclockwise
vortex in C was not consistently well developed within the horizontal laser
plane). Blue vectors indicate both the mean orientation and magnitude of
stroke-averaged force within the horizontal plane (normalized to soft dorsal
fin area). In general, trout generate dorsal fin forces of lower relative
magnitude and with more lateral orientation than sunfish during comparable
swimming behaviors.
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