A description is given of the normal burrowing posture of the “Kuruma” prawn, Penaeus japonicus BATE in connection with its ventilation.
Experiments show that when the environmental oxygen concentration is reduced below 1.0cc/1 prawns project their respiratory siphons above the surface of the sand and when it is reached to 0.5cc/1 they come out entirely of the sand and dyspnoea develops.