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Verification of the Backscattering Strength Based on the Swimming Behavior of Antarctic Krill
Inwoo Han,오우석,나형술,최석관,강수경,Euna Yoon,이경훈 한국해양과학기술원 2020 Ocean science journal Vol.55 No.3
This study provides an estimate of the SDWBA-modelled mean target strength for given sets of krill length and swimming orientation. The range of the dB identification window for krill length was between 28 mm and 67 mm and the distribution of swimming orientation N[11.0 degrees, 4.0 degrees] was estimated to be between 0.06-10.97 dB, while the range estimated using N[53.1 degrees, 21.4 degrees], i.e., the distribution of orientation obtained under the brightest illuminance level, was 5.21-9.82 dB. The range of the dB window calculated using N[45.2 degrees, 23.0 degrees], obtained under the second brightest illuminance level, was 3.83-11.76 dB, and the range calculated with N[48.1 degrees, 23.0 degrees], obtained under the third illuminance level, was 3.83-11.76 dB. The range of the dB window calculated by N[45.9 degrees, 23.0 degrees] was 3.41-11.75 dB, and the range of the dB window for krill length ranging from 28 mm to 67 mm was 4.05-11.34 dB. In all the swimming orientations, the smaller the krill size was the lower the averaged target strength value was; likewise, the larger the krill size was the higher the averaged target strength value was. The result indicated that swimming orientation impacted greatly on the range of frequency differences of Antarctic krill.
하계 광양만 주변 해역의 새우조망 어획조사 및 수산자원 음향조사
한인우 ( Inwoo Han ),오우석 ( Wooseok Oh ),박근창 ( Geunchang Park ),윤은아 ( Euna Yoon ),이경훈 ( Kyounghoon Lee ) 한국수산과학회(구 한국수산학회) 2019 한국수산과학회지 Vol.52 No.3
This study conducted a survey using a sampling inspection method and acoustic technique for continuous monitoring of useful organisms and non-commercial fish species distributed in the water of Gwangyang Bay, and evaluated the marine resources. In June, 2018, 38 species were caught in the shrimp beam trawl, comprising 3,594 marine organisms with a total weight was 65,415.3g. The acoustic survey showed that the nautical area scattering coefficient (NASC; ㎡/n.mile<sup>2</sup>) for the waters of Gwangyang Bay was highest in Transect 15 (1,655.5 ㎡/n.mile<sup>2</sup>) and lowest in Transect 1 (1.3 ㎡/n.mile<sup>2</sup>). The biomass was estimated to be 2,634.9 tons in the acoustic survey. This indicates that the acoustic survey method detected more fish shoals than the sampling inspection method.