魚類の聴覚と音環境に関する研究-I : 水中騒音の周波数分析

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For the study on the hearing of fishes, first I measured the sea noise in their living environment. Two areas were selected for measurement. One was southern part of Izu peninsula, and the other was Kujukuri seashore. In the field, the sea noise was measured on sound level and recorded in the magnetic sound-tape. Its tape was analysed by the Sonagraph in the laboratory. The results are as follows: 1. At the constraction on the frequency of sound, the sea noise near the sea shore contained high frequency part, but the sea noise far from there dropped in high part (Fig. 6). 2. At the far stations from the sea shore, the high frequency part dropped at the deep layer more than the surface of sea (Fig. 4). 3. In midnight, fishes and other animal noise were dominant without masking by general water noise (Fig. 7). 4. At the Kujukuri sea shore (the bottom was very sloping), the very low frequency part was lost concerning the horizontal propagation (Fig. 8). From these results, there had been two suggestions: 1. Several hundred cps might be easily heard by fishes. 2. Fishes might be hear such sounds with their inner ears.
公益社団法人日本水産学会の論文