Journal of the Korean Society of Fisheries and Ocean Technology (수산해양기술연구)

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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Fish length dependence of target strength for black rockfish, goldeye rockfish at 70kHz and 120kHz

70kHz 및 120kHz에 있어서 조피볼락, 불볼락에 대한 반사강도의 체장 의존성

  • Mun, Jae-Ho (Management support team, National Fisheries Research & Development Institute) ;
  • Lee, Dae-Jae (Department of Marine Production System Engineering, Pukyong National University) ;
  • Shin, Hyeong-Il (Department of Marine Production System Engineering, Pukyong National University) ;
  • Lee, Yoo-Won (Department of Marine Production System Engineering, Pukyong National University)
  • 문재호 (국립수산과학원 연구운영팀) ;
  • 이대재 (부경대학교 해양생산시스템공학과) ;
  • 신형일 (부경대학교 해양생산시스템공학과) ;
  • 이유원 (부경대학교 해양생산시스템공학과)
  • Published : 2006.02.28
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Abstract

Black rockfish and goldeye rockfish are commercially important fish species due to the increasing demand in Korea. When estimating the abundance of stocks for these species acoustically, it is of crucial importance to know the target strength(TS) to length dependence. In relation to these needs, TS measurement was conducted on black rockfish and goldeye rockfish in an acrylic salt water tank using 70kHz and 120kHz split beam echo sounders. The TS for these two species under the controlled condition was simultaneously measured with the swimming movement by DVR system and analyzed as a function of fish length(L). The results obtained are summarized as follows: The best fit regression of TS on fish length of black rockfish was TS=19.38 Log(L, cm)-70.46 ($r^2=0.71$) at 70kHz and TS=22.39 Log(L, cm)-70.40 ($r^2=0.64$) at 120kHz and in the standard form TS=20 Log(L, cm)-71.29 ($r^2 = 0.70$) at 70kHz and TS=20 Log(L, cm)-66.88 ($r^2=0.57$) at 120kHz. The best fit regression of TS on fish length of goldeye rockfish was TS=17.10 Log(L, cm)-68.28 ($r^2=0.37$) at 70kHz and TS=24.39 Log(L, cm)-73.74 ($r^2=0.59$) at 120kHz and in the standard form TS=20 Log(L, cm)-72.03 ($r^2=0.32$) at 70kHz and TS=20 Log(L, cm)-67.68 ($r^2=0.64$) at 120kHz. An empirical model for fish TS(dB) averaged over the dorsal aspect of 115 fishes of black rockfish and goldeye rockfish and which spans the fish length(L, m) to wavelength($\lambda$, m) ratio between 8 and 30 was derived : TS=34.12 Log(L)-14.12 Log($\lambda$)-23.83, ($r^2=0.90$).

Keywords

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