The survey was conducted to investigate biomass and distribution of fisheries resources using a quantitative echo sounder and a fixed gillnet around Marado coast of Jeju to obtain the scientific basic data for dispute resolution with a large purse seine fishery and coastal fishing and policy establishment of reasonable fisheries resources. Hydroacoustic surveys were conducted six times (November 28~29, 2015 (night), February 23~24, 2016 (night) and March 3~4, 2016 (night/day), March 30~31, 2016 (night/day)) using a quantitative echo sounder. The pelagic fish densities were relatively higher around Marado in November 2015, February 2016 and March 3~4, 2016. However, demersal fish densities were relatively higher in Jeju coastal waters on March 30~31, 2016. Catch data using fixed gill net were used to calculate biomass. Based on the hydroacoustic data, fish length-weight function and target strength information of dominant fish, the biomass of fishes were estimated as follow: 5.64 ton CV = 70.2% at night on November 28-29 2015, 7.14 ton CV = 35.8% of pelagic fish and 530.77 ton CV = 34.6% of demersal fishes at night on February 23-24 2016, 2.34 ton CV = 56.7% of pelagic fish and 571.93 ton CV = 40.3% of demersal fish at daytime, 1.39 ton CV = 48.4% of pelagic fish and 194.59 ton CV = 54.3% of demersal fish at night on March 3~4 2016, 0.37 ton CV = 72.9% of pelagic fish and 338.79 ton CV = 99.7% of demersal fish at daytime, 0.24 ton CV = 21.3% of pelagic fish and 68.61 ton CV = 53.8% of demersal fish at night on March 30~31 2016.
우리나라에서는 200해리 배타적 경제수역 설정, 연안 해역의 환경오염, 어민들의 남획 등으로 인하여 연근해 수산자원을 효율적으로 이용하기 위하여 어떠한 관리들이 이루어지고 있는가?
어구 제한, 어체 크기 및 성별 제한, 어장과 어기 제한, 보호 수역 및 보호수면의 설정과 같은 기술적 수단에 의한 관리, 총허 용어획량 (Total Allowable Catch: TAC) 관리, 바다목장 조성과 인공어초 사업 및 수산종묘방류사업을 통한 인위적인 자원조성 관리, 자율관리어업에 의한 자율적 관리가 이루어지고 있다.
우리나라는 200해리 배타적 경제수역 설정, 연안 해역의 환경오염, 어민들의 남획 등으로 인하여 연근해 수산자원을 효율적으로 이용하기 위하여 어구 제한, 어체 크기 및 성별 제한, 어장과 어기 제한, 보호 수역 및 보호수면의 설정과 같은 기술적 수단에 의한 관리, 총허 용어획량 (Total Allowable Catch: TAC) 관리, 바다목장 조성과 인공어초 사업 및 수산종묘방류사업을 통한 인위적인 자원조성 관리, 자율관리어업에 의한 자율적 관리가 이루어지고 있다.
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