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박근창(Geunchang PARK),서정명(Jeongmyeong SEO),오우석(Wooseok OH),이경훈(Kyounghoon LEE) 전남대학교 어업기술연구소 2018 어업기술연구소보고지 Vol.11 No.1
This study was aimed at measuring the acoustic impedance of Japanese black porgy to estimate its sustainable production and resources. The acoustic impedance need to know density contrast and sound speed contrast of target fish. The density contrast is obtained by the Pipette method and sound speed contrast is obtained by the Time-of-flight method. To get basic information on the Japanese black porgy in the experiment, 10 different sizes used. As a result, the body length increases as the weight of the Japanese black porgy was increased. The correlation between the body length and density contrast of the Japanese black porgy was very low. Also, the acoustic speed contrast was shown at very low correlation. However, due to lack of 20~25cm of Japanese black porgy, the standard deviation value is not constant. The impedance results of Japanese black porgy will should be used as basic date of acoustic scattering characteristic and identification of fish.
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.
우리나라 연근해 해역에서 서식하는 노무라입깃해파리(Nemopilema nomurai)의 수층별 분포 및 조사방법별 상관성 분석
오선영 ( Sunyoung Oh ),김경연 ( Kyoung Yeon Kim ),임월애 ( Weol Ae Lim ),박근창 ( Geunchang Park ),오현주 ( Hyunjoo Oh ),오우석 ( Wooseok Oh ),이경훈 ( Kyounghoon Lee ) 한국수산해양기술학회 2021 수산해양기술연구 Vol.57 No.4
In this study, the vertical distribution of giant jellyfish analyzed echo counting method and such survey methods as sighting and trawl were used to compare its density estimates. In May and July 2021, surveys were conducted in the East China Sea and the coastal waters of Korea. As a result, Nemopilema nomurai were evenly distributed in all water layers in East China Sea in May and July. When considered the correlation by each survey methods, it is possible to identify jellyfish in the surface area by sighting method and using sampling net; however, it has a low correlation with acoustic estimates due to marine environmental factor such as weather condition, wind and atmospheric pressure. Therefore, the result can be utilized by basic data when estimating jellyfish’s distribution patterns and density estimates from each survey methods hereafter.
다중주파수를 이용한 살오징어(Todarodes pacificus)의 분포밀도 추정
신형호 ( Hyoung-ho Shin ),정종일 ( Jongil Jung ),이형빈 ( Hyoungbeen Lee ),오우석 ( Wooseok Oh ),박근창 ( Geunchang Park ),이경훈 ( Kyounghoon Lee ) 한국수산과학회 2021 한국수산과학회지 Vol.54 No.6
The Japanese common squid Todarodes pacificus is one of the fish species within the total allowable catch (TAC) system which requires further investigation. In this study, the acoustic survey method was used to analyze the distribution of the Japanese common squid Todarodes pacificus across all the seas of South Korea. The sea area within Korea was investigated using the research vessels 20, 21, and 22 of the National Institute of Fisheries Science. The acoustic surveys were carried out from July to September 2019 and February to May 2020. The acoustic systems used in the survey had frequencies of 38 kHz and 120 kHz (EK60, EK80, Simrad, Norway) of the split-beam scientific echosounder. The results showed that, in spring, 277 m<sup>2</sup>/nmi<sup>2</sup> was the highest in the east sea area, and the same in the summer season 880 m<sup>2</sup>/nmi<sup>2</sup> was the highest in the east sea area. In autumn, the highest nautical area scattering coefficient (NASC) value was observed in the coastal portion of the south sea, and in winter, the NASC values were generally low in all the sea area.