Period Analysis of the Swimming Sound of Fish by the Zero-Crossing Method.

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  • ゼロ‐クロッシング法による魚群遊泳音の周期解析
  • ゼロ-クロッシング法による魚群遊泳音の周期解析
  • ゼロークロッシングホウ ニ ヨル ギョグン ユウエイオン ノ シュウキ カイセ

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The paper describes the period change, power, and continuation time of swimming sounds by fish. The underwater sounds measured in net cages at the Hayato culture ground were analyzed with the zero-crossing method.<br> The results show that: 1) the swimming sound of fish schools had periods from 4ms to 100ms; 2) histograms of zero-cross periods for yellowtail and amberjack were sharp with one mode; red sea bream, mode with a shoulder; amberjack, bimode; and tiger puffer, mode; 3) high-speed swimming sounds by large-size fish consisted of pulse waves of narrow-range periods; 4) the swimming sounds of small and/or altering-speed fish largely changed in period; 5) the present method makes. it possible to separate swimming sounds of fish from ambient noise and to detect small power swimming sounds by fish such as tiger puffers.

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