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Studies on detecting methods of jellyfish aurelia aurita by acoustic means



Studies on detecting methods of jellyfish aurelia aurita by acoustic means



Bulletin of the Japanese Society of Fisheries Oceanography 55(1): 25-34



Studies on the detecting method of jellyfish Aurelia aurita by acoustic means were performed in Tokyo Bay, Japan. Scientific echo sounder, FQ-50 was used for this investigation. In order to confirm the existence of jellyfish, net samplings were carried out simultaneously with the acoustic measurement. The results of the observation using two frequencies (200 and 50 KHz) showed that a difference in the SV (volume scattering strength, unit dB) between two frequencies is one of the available parameters for jellyfish detecting. Two standard values for the judgment of jellyfish, i.e., (1) SV difference and (2) SV by 50 KHz, were decided from the observed jellyfish's data. These values were incorporated into the discrimination program drawn in BASIC. The acoustic judgment of jellyfish was made successfully based on this discrimination program.

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Accession: 007831642

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