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자료유형
학술저널
저자정보
저널정보
한국수산해양기술학회(구한국어업기술학회) 수산해양기술연구 수산해양기술연구 제46권 제3호
발행연도
2010.1
수록면
239 - 247 (9page)

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Species of fish such as striped beakperch, bluefin searobin and konoshiro gizzard shad are commercially very important due to their high demand in the Korean market. When estimating acoustically the abundance of stocks for these species, it is of crucial importance to know the target strength (TS) to the length dependence. In relation to these needs, the TS experiments were conducted on three different species in an acrylic salt water tank using two split-beam echo sounders of 70 and 120 kHz. The TS for these three species under the controlled condition was simultaneously measured with the swimming movement by a DVR system and analyzed as a function of fish length (L) and frequency (or wavelength λ). The equation of the form was derived for their TS-length dependence. The best fit regression of TS on fork length for striped beakperch was estimated as TS = 35.67 log(L, m) - 15.67 log(λ, m) - 46.69 (r2=0.78). Furthermore, the best fit regression of TS on fork length for konoshiro gizzard shad was shown to be TS = 25.85 log(L, m) -5.85 log(λ, m) - 32.22 (r2=0.51). The averaged TS for 12 bluefin searobins with a mean length of 24.36cm at 70 kHz was analyzed to be -41.55dB. In addition, the averaged tilt angle obtained simultaneously by a DVR system with TS measurements for 27 konoshiro gizzard shads swimming within an acrylic salt water tank was estimated at -2.7°.

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