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Fig. 7. (A) Flow variables measured during mayfly larval swimming. A scheme of an individual ring vortex is shown on the left and of the pattern of ring vortex shedding on the right. Abbreviations: r, ring radius; r_p, ring vortex radius measured at the ring plane; r_a, ring vortex radius measured along the vortex axis; _jet, jet velocity relative to the surrounding water measured at the ring plane; U, forward velocity; , momentum axis of the ring vortex in the median plane of the body. (B) Velocity profiles measured along the vortex axis in three separate ring vortices. The data represent the distance travelled by the dye front, during consecutive 20 ms intervals, as it progressed from the trailing edge to the leading edge of the ring vortex. The data are given in vortex fixed coordinates and therefore represent the re-circulatory component of the axial jet.

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