보문 : 담수산 어류 꺽지 (Coreoperca herzi)의 자원 평가 및 관리 방안 연구: 섬진강 중,상류 수계에서 꺽지의 자원량 및 잠재생산량 추정(2) = Stock Assessment and Management Implications of the Korean aucha perch (Coreoperca herzi) in Freshwater: (2) Estimation of Potential Yield Assessment and Stock of Coreoperca herzi in the Mid-Upper System of the Seomjin River

다국어 초록 (Multilingual Abstract)

The study sought to determine the efficient management of Korean aucha perch by estimating the potential yield (PY), which means the maximum sustainable yield (MSY) based on the optimal stock, in the mid-upper region of the Seomjin River watershed from August 2008 to April 2009. The stock assessment was conducted by the swept area method and PY was estimated by a modified fisheries management system based on the allowable biological catch. Also, the yield-per-recruit analysis (Beverton and Holt, 1957) was used to review the efficient management of resource, Coreoperca herzi. The age at first capture (t(c)) was 1.464 age and converted body length was 7.8 cm. Concerning current fishing intensities, the instantaneous coefficient of fishing mortality (F) was estimated to be 0.061 year-1; yield-per-recruit analysis estimated the current yield per recruit as 4.124 g with F and t(c). The fishing mortality of Allowable Biological Catch (F(ABC)) based on the current t(c) and F was estimated to be 0.401 year-1, therefore, the optimum. fishing intensities could be achieved at the higher fishing intensity for Coreoperca herzi. The calculated annual stock of Coreoperca herzi was 3,048 kg, the potential yield was estimated to be 861 kg with t(c) and F(ABC) at the fixed current level. Using yield-per-recruit analysis, if F and t(c) were set at 0.643 year-1 and 3 age, respectively, the yield per recruit would be predicted to increase 3.4-fold, from 4.12 g to 13.84 g.