Feature of the Swimming Sound for Fishes in the Netting Cages at the Culture Ground

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  • 養殖生簀内における魚群遊泳音の特徴
  • ヨウショク イケスナイ ニ オケル ギョグン ユウエイオン ノ トクチョウ

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This paper describes some feature of the swimming sounds for fishes within the netting cages were recorded at Hayato culture ground in the innermost area of Kagoshima Bay. Subjects of investigation were Yellowtail Seriola quinqueradiata, Amberjack Seriola dumerili, Amberjack Seriola lalandi, Red Sea Bream Pagrus major, and Tiger Puffer Takifugu rubripes. The recorded underwater sounds were analyzed with the three kinds of method in order to obtain the characteristics of wave forms and frequency; three-dimensional expression of multiframe wave form, power spectrum, and one third octave band analyses. In result, swimming sounds in the main band width ranging from 50Hz to 400Hz, and TEMPURA Noise in the band width ranging above 500Hz were observed to two typical wave form of underwater sounds in a netting cage. Swimming sounds were sporadic wave in a state of pales. A concavity pattern appeared at the near boundary of them in the band width ranging from 200Hz to 1kHz.

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