Auditory Threshold of Japanese Horse Mackerel Trachurus japonicus.

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  • マアジの聴覚しきい値
  • マアジの聴覚閾値
  • マアジ ノ チョウカク イキチ

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The purpose of this paper is to investigate the auditory threshold of Japanese horse mackerel which is one of the important pelagic fish for Japanese fisheries. The hearing of fish was studied by means of a cardiac conditioning technique. Classical conditioning method was performed with the sound coupled with a delayed electric shock. The threshold was determined by analyzing the elec-trocardiogram. The sensable frequencies ranged widely from 70Hz to 3000Hz which was most stimulative to the Japanes horse mackerel. As the frequency becomes higher than 70Hz, the auditory threshold decreased. At 1000-1500Hz (sound pressure 81-75dB) when the fish's hearing was most sensitive, the threshold tends to increase more than one. Lastly, it was assumed that a round haul netter traffic noise caused an escape action for the fish shoal.

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