Fig. 4. Auditory evoked potentials from the 27–35 mm, the 50–55 mm and 66–71 mm body length P. serratus in response to a 500 Hz tone burst presented at 125 dB, and averaged from 1000 iterations of the stimulus sound. The arrows indicate the peak of the largest sinusoid of the response from the three sizes of prawn tested 27–40 mm, 41–59 mm and 63–71 mm.