Fig. 7. Velocity vectors on the surface of the bird wrasse at five instants during the fin oscillation. The swimming velocity is 45 cm s^-1. (A) t=1.065 s (84% downstroke). (B—F) Close-up view of the fin and body junction. (B) t=0.963 s (32% downstroke), (C) t=1.065 s (84% downstroke), (D) t=1.104 s (8% upstroke), (E) t=1.140 s (43% upstroke) and (F) t=1.167 s (68% upstroke). Velocity vectors are colored according to the magnitude of velocity (cm s^-1) and are of constant length.

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