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Fig. 8. Vortex filament model showing vortices near steadily swimming bluegill
sunfish and brook trout. Numbers indicate vortex circulation (in
mm2 s–1), to evaluate the relative vortex
strengths, and the superscript letter identifies the source (see below). (A)
3D vortex structure for bluegill sunfish swimming at about 1.2 L
s–1. Gaps in the dorsal and anal fin vortices in the wake
indicate regions where the vortices should link up to the caudal fin vortices,
but for which there are too few data to identify the topology of the filament.
(B) Experimentally observed vortices for the dorsal, anal and caudal fins of
trout swimming at 0.5 L s–1. Dotted lines in the
caudal fin vortices indicate a region that might have a deformation, like in
bluegill sunfish, but for which there are not appropriate data for any
definitive conclusions. Sources of circulation data:
a(Tytell, 2006);
b(Drucker and Lauder,
2001) (estimated from published figures);
c(Standen and Lauder,
2007); d(E.M.S. and G.V.L., unpublished data).
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