Fig. 2. Vorticity field (colour map) and flow velocities (black arrows) generated during the preparatory (left columns) and propulsive stroke (right columns) of a larval C-start (age 5 d.p.f., body length L=4.4 mm). The sketches beside the vorticity colour maps highlight the most relevant flow features. Over the entire C-start, the larva sheds two vortex pairs, one during the preparatory (vortices 1 and 2), and one during the propulsive stroke (vortices 2b and 3). By the time, the second pair is shed, the first pair has moved from its initial shedding position and has almost disappeared (70 ms, vorticity field). Grey arrow, jet into concave body bend; white arrows, other jets; blue circles: clockwise vortices; ochre circles, counter-clockwise vortices. (Same sequence as Fig. 1.)