식이음 및 인공음에 대한 어류의 반응행동을 조사하기 위하여 농어의 식이음 및 인공음을 녹음하고 다시 이들을 수중에 방성하여 농어와 숭어의 반응행동을 조사한 결과는 다음과 같다. 1. 식이음에 대한 양의 주음반응은 농어는 강하게 나타내나 숭어는 미약한 반응을 나타내는 것 같다. 2. 식이음에 대한 양의 주음반응을 일으키게 하는데는 적정음압의 식이음을 방성하것이 효과적이었다. 3. 인공음에 대한 반응은 공시어들은 부의 주음반응을 나타내었다. 4. 시어들을 음원에서 멀어지게 하는데는 방성음의 음압을 증가시켜 방성하는 것이 더욱 효과적이었다.
In order to obtain the fishing possibility by acoustic, the two fishes, Lateolabrax japonicus, Mugil cephalus, were bred in a water tank. The feeding sounds from the fishes and the artificial sounds were recorded by a hydrophone and then the frequency and the sound pressure level of the sounds recorded were analyzed by the digital frequency analyzer. These sounds were edited in two manners of which one is emitted for 10 seconds and paused for 10 seconds continuously and the other is emitted for 20 seconds and paused for 20 seconds also. These edited sounds were emitted again into the tank and the respose of fisher were observed. Lateolebrax japonicus showed a positive response and Mugil cephalus responsed a little positively to the emitted feeding sound, The fishes seemed to show a positive response only in emitting a moderate pressure level of feeding sound. Lateolabrax japonicus and Mugil cephalus showed negative response to the emitted artificial sound. It was most effective to increase the sound pressure level that the fishes went away from the sound source to the emitted artificial sound.
