日本海西部におけるシイラ漁況の研究-XIV : 漬木の発する水中騒音とシイラのつきについて

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Underwater sounds produced by “Tsukegi” (floating rafts) are considered as one of the reasons dolphins gather under “Tsukegi”. In the present paper, underwater sounds produced by a series of five “Tsukegi”, with different sizes, shapes and materials, were measured; and dolphins under each “Tsukegi” were observed. (Fig. 1). 1) In “Tsukegi” A and E5), which are generally used in fisheries, it is observed that there is a clear difference in spectrum and sound pressure level when compared with natural underwater sounds. “Tsukegi” B and D, which have simple construction, also produced somewhat different sounds from natural underwater sounds. (Plate 1). 2) Dolphins and other small fishes gathered under the “Tsukegi” in the increasing order D, B, C, A, E. This order coincides with the increasing order of difference between sounds produced by “Tsukegi” and natural underwater sounds. (Table 1).
公益社団法人日本水産学会の論文