Larvae burst away from a continuous suction source at 5 days post fertilization.

A. Schematic of the experimental suction chamber which is immersed in a large volume bath and connected with tubing to a retention flask and vacuum motor. B. Comparison of two suction avoidance behaviors. Position of a larva (black line) drifting towards and then bursting away from the suction source (origin at 0 cm), and another larva continuously holding station instead of bursting (gray line). C. Time series of a rheotactic larva (gray circles) escaping the suction source (arrow) with a quick burst of swimming. Frames taken every 350 ms.