The calls of the Japanese parrot fish Oplegnathus fasciatus consisted of a pulse or a series of pulse sounds. The calls were divided into three patterns by method of pulse sound projection, namely, single popped call, complex popped call and repeated popped call. Each pulse sound was made of a frequency component from less than 30Hz to about 1kHz. The duration of pulse sound was usually 13-20 msec. In complex popped call, the interval between each pulse sound was 11-367 msec. In repeated pulse call, the repetition rate of each pulse sound was from 0.5 to 1.4 per second. The frequency of sound emitting became high before and after sunrise and sunset. They emitted vigorous calls during the spawning period. The calls which are mainly used for threatening invaders, are made by the rapid movement of the operculum and amplified by the swim-bladder.