A system and method of repelling aquatic mammals from an area of water are provided. The system utilizes a speaker to transmit the sounds of predators into the area of water to repel mammals from the area and to deter mammals from returning to the area. The system includes a timer module programmed to repetitively transmit predator sounds on a time delay. By utilizing periodic intervals of predator sounds, the system and method prevent mammals from becoming conditioned to the predator sounds, thereby maintaining the effectiveness of the system over a prolonged period of time.
