溪红点鲑(Salvelinus fontinalis)背鳍和臀鳍的水动力学功能研究
Recent kinematic and hydrodynamic studies on fishmedian fins have shown that dorsal fins actively producejets with large lateral forces. Because of the location ofdorsal fins above the fish’s rolling axis, these lateral forces,if unchecked, would cause fish to roll. In this paper weexamine the hydrodynamics of trout anal fin function andhypothesize that anal fins, located below the fish’s rollingaxis, produce similar jets to the dorsal fin and help balancerolling torques during swimming. We simultaneouslyquantify the wake generated by dorsal and anal fins inbrook trout by swimming fish in two horizontal lightsheets filmed by two synchronized high speed camerasduring steady swimming and manoeuvring. Six majorconclusions emerge from these experiments.