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항해 및 동지나해에 있어서 기선저인망어업 대상 참조기의 자원량 해석
신상택 한국어업기술학회 1972 수산해양기술연구 Vol.8 No.1
Yellow croacker, Tseudociaena manchurica Jordan et Thompson in the Yellow Sea and East China Sea are subjected to be caught by trawl nets throughout the year. First indices of population size in every period 8re calculated. Considering present status of the yellow croacker fishery and ecology of the fish, mathematical models must have been established in order to determine catchability coefficient, natural m ortali ty, fishing mortality, recrui ting coefficient of the fish ing ground, and dispersion coefficienl from the fishing ground. The results an, summmarized as follows: Catchabil i ty coefficient (C) = 2. 2628 × 10-5 Natural mortality (M)=0.3293 Population for lhe first half season(July 1st to the following January 3lst) Initial population = 14, 621 /MT Recruitment =45, 597 /MT Natural mortality = 8, 660 /MT Final population =42, 970 /MT Population for the latter 1131f scason(February 1st to June 30th) Initial population = 69, 170 /MT Dispersion =51, 688 /MT Natural mortality = 6, 082 /MT Final population = 1, 802 /MT.
辛翔澤 釜山水産大學校 1970 釜山水産大學 硏究報告 Vol.10 No.2
The formula indicated as (1) derived from the least square method has been applied in the propagation or errors, and this also effects to the propagation of the errors by initial data only. In the process of mass reckoning the propagation of errors as classified in (C) and (D) of the pragraph Ⅱ reduced not to be neglected. Therefore, the author carried out a study with respect to the propagation of the (D) reducted from solving the simultaneous linear equations by the method of elimination, and derived a expression (3). It was found that the calculated errors by the above expression almost coincide with the given definite errors in examples of (2) and (3).
韓國沿近海에 있어서 旋網漁業 對象 고등어, 전갱이의 資源量解析
辛翔澤 釜山水産大學校 1973 釜山水産大學 硏究報告 Vol.13 No.1
Mackerel Pneumatophorus japonicus and horse mackerel Trachurus japonicus in the neighboring waters of Korea are caught by purse-seiner throughout the year. Monthly indices of population size are calculated. Mathematic model (5) were used in order to determine catchability coefficient, natural, mortality, fishing mortality, recruiting coefficient of the fishing ground, and dispersion coeffecient from the fishing ground. The results are summarized as follows: 1. Mackerel Catchability coefficient (C)=2.48557 X ?? Natural mortality (M) = 1.42425 Population for the first half season (June 1st to the following January 31st) Initial population = 48,794.4 M/T Recruitment =172,806.6 M/T Natural mortality = 96,995.2 M/T Final population = 91,936.0 M/T Population for the latter half season (February 1st to May 31st) Initial population = 91,237.1 M/T Dispersion = 25,359.3 M/T Natural mortality = 49,151.5 M/T Final population = 8,234.3 M/T 2. Horse mackerel Catchability coefficient (C) = ?? Natural mortality (M) = 1.20582 Population for the first half season (June 1st to the following January 31st) Initial population = 5,138.0 M/T Recruitment =16,783.5 M/T Natural mortality = 8,744.1 M/T Final population = 9,878.0 M/T Population for the latter half season (February 1st to May 31st) Initial population = 2,812.5 M/T Dispersion = 1,079.4 M/T Natural mortality = 1,254.1 M/T Final population = 236.2 M/T
辛翔澤 釜山水産大學校 1971 釜山水産大學 硏究報告 Vol.11 No.2
A method of estimating fish population is proposed by applying Schnabel's marking method. As a method of fish stock assessment for a certain school of fish in the fishing season, the population of commercial-sized fish to be captured would be estimated after the marking method. The advantage of the method is that the fish population of the same age is assessed without difficulties of tagging and discharging in alive, while the disadvantage of which is that confidence of assessed values of the fish population at the beginning of the fishing season are less definite.