In Situ Measurement of Sound Attenuation by Fish Schools (Japanese Horse Mackerel, Trachurus japonicus) at Mid-Frequency Bands SCIE SCOPUS

Cited 0 time in WEB OF SCIENCE Cited 0 time in Scopus
Title
In Situ Measurement of Sound Attenuation by Fish Schools (Japanese Horse Mackerel, Trachurus japonicus) at Mid-Frequency Bands
Author(s)
Kim, Hansoo; Paeng, Dong-Guk
KIOST Author(s)
Kim, Hansoo(김한수)
Publication Year
2021-02
Abstract
Acoustic waves are attenuated by fish schools as they propagate through the ocean. The attenuation by fish schools is not currently considered in fishery acoustics and sonar applications, especially at mid-frequency bands. In this study, fish school attenuation experiments were conducted with a number of individual fish in situ in a net cage at mid-frequency bands (3-7 kHz). The target fish species was the Japanese horse mackerel (Trachurus japonicus), which typically forms fish schools in the coastal ocean of northeastern Asia. The attenuated acoustic waves were measured for the cases of non-net, only net (0), 100, 200, 300, 400, and 500 individual horse mackerels in the net cage. Results showed that the acoustic signal attenuation increased with the number of horse mackerels. The mean and maximum attenuation coefficients were approximately 6.0-15.4 dB/m and 6.5-21.8 dB/m for all frequencies, respectively. The measured attenuation coefficients were compared with the ones from previous studies to propose new regression models with normalized extinction cross-sections of weight and length of fish. This study confirmed that the fish school attenuation could not be ignored and compensated at mid-frequencies in the ocean. These results would be useful for fishery acoustics, especially in the development of scientific echo-sounder, and naval applications of sonar operations and analysis.
ISSN
2076-3417
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/40162
DOI
10.3390/app11041944
Bibliographic Citation
APPLIED SCIENCES-BASEL, v.11, no.4, pp.1 - 12, 2021
Publisher
MDPI
Keywords
sound attenuation; fish schools; mid-frequency; in situ measurement; Japanese horse mackerel
Type
Article
Language
English
Document Type
Article
Publisher
MDPI
Related Researcher
Research Interests

Underwater acoustics,Bioacoustics,Fishery acoustics,수중음향,생물음향,수산음향

Files in This Item:
There are no files associated with this item.

qrcode

Items in ScienceWatch@KIOST are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse