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kfas, vol. 57, no. 3, pp.302-309, June, 2024 DOI. https://doi.org/10.5657/KFAS.2024.0302

Target Strength of Anchovy Engraulis japonicaus by Theoretical Acoustic

Scattering Model

박근창·오우석1·이유원2·이형빈3·이경훈2*
국립부경대학교 해양생산관리학부, 1국립경대학교 저탄소해양생산기술연구소, 2국립경대학교 해양생산시스템관리학부, 3국립수산과학원 수산자 원연구센터

ABSTRACT

This study estimates the target strength of anchovy Engraulis japonicus required for studying their distribution and density using acoustics and evaluates the acoustic scattering characteristics of anchovies by frequency using the Kirchoff ray mode (KRM) model. The experiment was conducted on 30 anchovies with 4.7-21.5 cm total length. The maximum TScm (Simming angle, 9.1°; standard deviation, ± 13.1°) according to total length was -66.9, -65.2, -64.4, and -63.4 dB at 38, 70, 120, and 200 kHz, respectively. The average TScm (Simming angle: 9.1°, standard deviation: ± 13.1°) according to total length was -68.9, -68.8, -69.6, and -70.0 dB at 38, 70, 120, and 200 kHz, respectively. The results of this study provide an important basis for future studies that use acoustics to estimate the target strength of anchovies.
Keyword

Anchovy, Target strength, Kirchhoff-ray mode modal, Swimming angle