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Figure 6


Fig. 6. Transition from cyclic swimming to coasting in a zebrafish larva (age 4 d.p.f., body length L=4.0 mm). (A) Amplitude envelope narrows, tail-beat frequency and stride length drop, as towards the end of an active swimming bout. (B) Peak curvature also decreases. Curvature of the body midline during the last four tail beats of a swimming bout. (C) The vorticity field (colour map) and velocity vector field (black arrows) adjacent to the larva show how the boundary layer increasingly engulfs the entire decelerating larva. Shown are the last two times that the tail reaches a lateral extreme (67 and 84 ms) and a coast flow field (105 ms). The times correspond to the time axis of B.





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