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http://dx.doi.org/10.3796/KSFT.2012.48.4.487

Verification and application of Target Strength for Japanese anchovy (Engraulis japonicas) by theoretical acoustic scattering model  

Hwang, Kangseok (Fisheries Resources Research Division, National Fisheries Research & Development Institute)
Lee, Kyounghoon (Fisheries System Engineering Division, National Fisheries Research & Development Institute)
Hwang, Bo-Kyu (Division of Marine Production System Management, Pukyong National University)
Publication Information
Journal of the Korean Society of Fisheries and Ocean Technology / v.48, no.4, 2012 , pp. 487-494 More about this Journal
Abstract
Acoustical backscattering characteristics of Japanese anchovy can be estimated by Kirchhoffray mode model (KRM model) due to estimate exact body and swim-bladder shape of the fish, the samples were rapidly frozen by dry-ice and alcohol. X-ray photos for ventral and lateral direction for 6 samples were taken and the 3D coordinates of the body swim-bladder were estimated by digitizing from the photos. The angles between the axis of body and swim-bladder were about $9^{\circ}$ at 38kHz and $7^{\circ}$ at 120kHz, 200kHz. General formula of TS and BL estimated were < $TS_{38kHz}$ >=20logBL-67.3, < $TS_{120kHz}$ >=20logBL-66.6, < $TS_{200kHz}$ >=20logBL-67.0. As a result, we confirmed KRM model is very useful to estimate TS (Target Strength) for design of experiment and it also can be applied to estimate the abundance of Japanese anchovy distributed by 2 frequency difference method in the survey area.
Keywords
Target strength; Japanese anchovy; Theoretical acoustic scattering model; 2 frequency difference method;
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Times Cited By KSCI : 3  (Citation Analysis)
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