현수법과 모델을 이용한 조피볼락의 유영자세각과 체장에 따른 음향 후방산란강도
(주)코리아스칼라
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- 2023.04.05
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- 2017.05
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서지정보
ㆍ발행기관 : 한국수산해양기술학회(구 한국어업기술학회)
ㆍ수록지정보 : 수산해양기술연구 / 53권 / 2호
ㆍ저자명 : 윤은아, 김기선, 이인태, 조현정, 이경훈
영어 초록
Rockfish was a commercially important fish specie in marine ranching areas in Korea. To estimate density and biomass of rockfish using acoustic method, target strength (TS) information is required on the species. This study measured TS dependence on tilt angle and size on 14 live rockfish individuals at 38, 70, and, 120 kHz by ex-situ measurement (tethered method) and acoustic scattering model (Krichhoff ray mode, KRM). The swimbladdered angle ranged from 18 to 30 (mean s.d. = 26 4 ). The mean TS for all individuals was highest -35.9 dB of tilt angle -17 at 38 kHz, -35.4 dB of tilt angle -25 at 70 kHz, and -34.9 dB of tilt angle -22 at 120 kHz. The ex-situ TS-total length (TL, cm) relationships were TS38kHz = 20log10(TL) - 67.1, TS70kHz = 20log10(TL) - 68.6, and TS120kHz = 20log10(TL) - 69.9, respectively. The model TS-total length (TL, cm) relationships were TS38kHz = 20log10(TL) - 66.4, TS70kHz = 20log10(TL) - 67.0, TS120kHz = 20log10(TL) - 67.0. The two measurements between the ex-situ TS and KRM model for TS-tilt angle and fish size were found to be significantly correlated.
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