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

이론모델을 이용한 멸치의 음향산란강도의 검토 및 적용

  • Received : 2012.10.12
  • Accepted : 2012.10.30
  • Published : 2012.11.30

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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Cited by

  1. Visual census and hydro-acoustic survey of demersal fish aggregations in Ulju small scale marine ranching area (MRA), Korea vol.51, pp.1, 2015, https://doi.org/10.3796/KSFT.2015.51.1.016

Acknowledgement

Grant : 수산업의 기후변화에 대한 영향 연구 및 대응 전략

Supported by : 국립수산과학원