Field studies on the effect of artificial underwater sound in the attraction of the fish schools

The effect of this new method of fishery is not always sure in all cases, but it may be useful in the future particularly for daytime fishing when luring lights would not be useful. A weak point of this method is that it is not available in rough seas as the ambient noise level is too high. If the pressure level of the artificial sound is much higher than the rough sea noise, the fish would be scared. The range over which the fish could be lured is limited by the sound level. The ranges offered are some 20-80 meters from the sound source in our estimation. This method of underwater sound and this equipment of which electric power consumption is less than 100 watts, would both be available to the fisheries, in additon to the characteristics of the individual fish species.