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Figure 2


Fig. 2. Tips of the caudal, dorsal and anal fins in bluegill sunfish cup actively into the flow. The motion of fins through half a tail beat from left to right in two transverse planes is presented. Each panel shows seven tracings of the posterior margins of the fins, spaced equally in time, as seen from behind the fish. The color and thickness of the bar indicate the lateral velocity of a particular segment of the fin. The beat frequency for each fin is the same, 2.4 Hz. (A) Caudal fin kinematics. (B) Dorsal and anal fin kinematics. Inset in A shows position of the two planes. Scales are the same for A and B (from Tytell, 2006).





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