Studies on the Underwater Sound―I On the Underwater Sound of Genus Alpheus FABRICIUS in the Coastal Waters of Japan

概要

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Four species of the genus Alpheus FABRICIUS, so-called snapping shrimps, namely A. bis-incisus de HAAN, A. brevicristatus de HAAN, A. rapax FABRICIUS, and A. japoni-cus MIERS, were caught in the coastal waters of Nagasaki Prefecture and their under-water sounds were recorded. These shrimps emit peculiar pulse which is very powerful. These sounds are emitted by striking of the inside projections of their large chela. The duration of this sound (pulse) is less than 18 millisecond and the frequency band reaches more than 7kc. It seems that the frequency of the sound emitted by individual specimen is less than 1 per second. The mechanism of emitting the sound varies by species but their sounds are all pulses which resemble closely. Furthermore, a sound spectorogram differs in detail from any other even in the same specimen. In effect, it is guessed that the underwater sound (pulse) emitted by genus Alpheus constitutes the largest part of"FRYING NOISE".
長崎大学水産学部の論文
1968-12-00