황해및 동지나해의 참조기자원량 해석 -주로 한국기선저인망, 안강망, 유자망, 일본기선저인망 어장을 중심으로-

STOCK ASSESSMENT OF YELLOW CROAKER IN THE YELLOW SEA AND EAST CHINA SEA

황해 및 동지나해에서 한국기선저인망, 안강망, 유자망, 일본기선저인망으로서 어획되는 참조기(Pseudosciaena manchurica의 자원량변동에 대해서 (1)식으로 표현되는 자원량변동의 수학적 $\lceil$모델$\rfloor$에 의하여 어획능율 및 겉보기 자연사망계수를 구하고 나아가서 어획계수, 어획능율등을 구하여 이들 자원량특성식을 이용하여 전후반어기의 자원량변동상태를 계산하였다.

Yellow croaker, Pseudosciaena manchurica Jordan et Thompson, in the Yellow Sea and the East China Sea are subjected to be caught by trawl nets, stow nets and gill nets throughout the year. Monthly indices of population size are calculated. Mathematic models (I) were used in order to determine catchability coefficient, natural mortality, fishing mortality, coefficient coefficient of the fishing ground and dispersion coefficient from the fishing ground. The results are summarized as follows: 1971 1972 1973 $$Catchability\;coefficient\;(C)=1.9369\times10^{-5}\;7.5459\times10^{-6}\;1.2670\times10^{-5}$$ Natural mortality (M) = 0.1645 0.6152 0.4367 Population for the first half season (February 1 to May 31) 1971 1972 1973 Initial\;population=\;107,100M/T 209,100M/T 214,400M/T Dispersion=83,000' 159,700' 133,400' Natural mortailty= 4,700' 32.700' 19,100' Final population= 2,800' 4,500' 49,000' Population for the latter half season (June 1st to the following January 31st) 1971 1972 1973 Initial population= 44,500M/T 67,500M/T 83,800MT Recruitment= 19,000' 183,900' 67,100' Natural mortality= 5,900' 67,900' 38,500' Final population= 37,000' 168,300' 92,400'.