Fig. 6. Representative DPIV analyses of the wake of the tail of Triakis semifasciata while (A) rising and (B) sinking in the water column. Each color plot shows fluid vorticity, with superimposed black velocity vectors representing the results of DPIV calculations as in Fig. 4. During rising behavior, the direction of the jet is similar to that while holding vertical position during horizontal locomotion, although the ring axis angle is inclined more horizontally. In contrast, during sinking behavior, the fluid jet is significantly more horizontal and the ring axis angle is significantly more vertically inclined. To assist in visualizing the flow pattern, a mean horizontal flow of U=19 and U=24 cm s^-1 was subtracted from each vector for rising and sinking, respectively. The white dashed line indicates the ring axis cycle.

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