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Fig. 4. Progressive visualisation of a discrete ring vortex shed from the tail fin
of a swimming mayfly larva. In a, the larva is swimming in the direction of
the arrow and is viewed from the side (dorsal to the left). The tail fin is
within 20 ms of the completion of its dorsal half-stroke. To the left of the
larva is a curved streamer. Subsequent frames (b,c) show the progressive
outlining of the ring vortex shed from the tail as it penetrates the streamer.
See text for more details. The arrow in b shows the direction of propagation
of the ring vortex.
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