Fig. 6. Trail produced by the wake of a larva swimming in ‘fast’ mode (note the trailing legs) just above, but making no physical contact with, a layer of milk on the bottom of the container. The fully formed trail in the right-hand panel (C) indicates two series of jets, flowing alternately to the left and right of the mean swimming line and directed to the rear. The arrows indicate the axes of two of the jets.

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