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Fish length dependance of acoustic target strength for large yellow croaker

부세에 대한 음향반사강도의 체장 의존성

  • 강희영 ;
  • 이대재
  • Published : 2003.08.01

Abstract

This paper was conducted as an attempt in order to construct the data bank of target strength for acoustic estimation of fish length in the coastal waters of Korea. The fish length dependence of acoustic target strength for 13 large yellow croakers (Pseudosciaena crocea) at 75 kHz was investigated and the prediction of the target strength by using the Kirchhoff-Ray Mode model (KRM model) was compared with target strength measurements. The results obtained are summarized as follows; 1. In the averaged target strength pattern for 13 large yellow croakers the maximum target strength was -35.13 dB at $-13.35^{\circ}$ on a tilted angle. 2. The relationship between fork length(L, cm) and averaged target strength(TS, dB) was expressed as follows; TS=23. 76log (L) -73.45 (r=0.47) TS=20log(L) -67.35 From this result, the conversion coefficient was -73.45 dB and 6.1 dB lower than the coefficient -67.35 dB where the value of the slope of the regression equation is forced to be 20. 3. Averaged target strength and a length conversion coefficient derived from a target strength histogram for 13 large yellow croakers of mean length 25.59 cm were -41.23 dB, -69.72 dB, respectively. 4. In the range of $$2;{\ll} L (fish length /{\lambda}(wave length);{\ll}40$$, the prediction of the averaged target strength by the KRM model increased gradually with the increasing of $L/{\lambda}$ and was lower than the measured target strength.

Keywords

target strength;fish length dependance;acoustic model;Kirchhoff-Ray Mode model

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  2. Overview of the Applications of Hydroacoustic Methods in South Korea and Fish Abundance Estimation Methods vol.17, pp.3, 2014, https://doi.org/10.5657/FAS.2014.0369
  3. Target strength measurements of black rockfish, goldeye rockfish and black scraper using a 70-kHz split-beam echo sounder vol.72, pp.4, 2006, https://doi.org/10.2331/suisan.72.644
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