2014년 동계 북부 동중국해 저층 트롤 및 음향학적 조사에 의한 저서어족생물자원의 분포특성 비교
Comparison of the Distribution of Demersal Fish Biomass Determined by Bottom Trawl and Hydroacoustic Surveys in the Northern East China Sea in Winter, 2014
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초록
This study examined the spatiotemporal distribution of demersal fish aggregations in the Northern East China Sea by conducting a trawl survey with hydroacoustic devices. A bottom trawl was used for this survey and fish density was determined from the catch data. Acoustic data were collected at frequencies of 38 and 200 kHz from November to December 2014 and converted into the nautical area scattering coefficient (NASC, m2/n∙mile2). In the catch data analysis, the range of catch per unit area by station was 26-8,055 kg/km2 and for the acoustic data, that of the NASC was 0.45-34.80 m2/n·mile2. The values were significantly correlated. The combined results of both surveys found that the density was highest at St. 5 (33° 10.3´, 126° 23.3´) and lowest at St. 8 (33° 20.7´, 127° 36.3´). The application of hydroacoustic methods offers a new approach for estimating the biomass of demersal fish aggregations.
Abstract
This study examined the spatiotemporal distribution of demersal fish aggregations in the Northern East China Sea by conducting a trawl survey with hydroacoustic devices. A bottom trawl was used for this survey and fish density was determined from the catch data. Acoustic data were collected at frequencies of 38 and 200 kHz from November to December 2014 and converted into the nautical area scattering coefficient (NASC, m2/n∙mile2). In the catch data analysis, the range of catch per unit area by station was 26-8,055 kg/km2 and for the acoustic data, that of the NASC was 0.45-34.80 m2/n·mile2. The values were significantly correlated. The combined results of both surveys found that the density was highest at St. 5 (33° 10.3´, 126° 23.3´) and lowest at St. 8 (33° 20.7´, 127° 36.3´). The application of hydroacoustic methods offers a new approach for estimating the biomass of demersal fish aggregations.
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