Fig. 7. Effect of hydrostatic pressure on swimming behaviour. (A) Swimming speed of individual larvae within 3 h of hatching at 2 atm pressure. (B) Time course of the hydrostatic pressure, applied 5 s after beginning behavioural measurements (arrow). (C) The time at which larvae began to swim at different pressure levels (1.1 to 2 atm). Swimming was not correlated with application of hydrostatic pressure.