简介:Recent kinematic and hydrodynamic studies on fish
median fins have shown that dorsal fins actively produce
jets with large lateral forces. Because of the location of
dorsal fins above the fish’s rolling axis, these la简介:Recent kinematic and hydrodynamic studies on fish
median fins have shown that dorsal fins actively produce
jets with large lateral forces. Because of the location of
dorsal fins above the fish’s rolling axis, these lateral forces,
if unchecked, would cause fish to roll. In this paper we
examine the hydrodynamics of trout anal fin function and
hypothesize that anal fins, located below the fish’s rolling
axis, produce similar jets to the dorsal fin and help balance
rolling torques during swimming. We simultaneously
quantify the wake generated by dorsal and anal fins in
brook trout by swimming fish in two horizontal light
sheets filmed by two synchronized high speed cameras
during steady swimming and manoeuvring. Six major
conclusions emerge from these experiments.
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