갈치 총허용어획량(TAC) 어업관리를 위한 생물경제학적 분석

Abstract

This study attempted to evaluate the stock status of Largehead hairtail (Trichiurus lepturus) which is one of commercially important fish species in South Korea. In addition, based on results of stock assessment, a bioeconomic model of Largehead hairtail was developed to consider the level of annual Total Allowable Catch(TAC) and impacts of Non-TAC target fisheries that catch Largehead hairtail. In the analysis, as stock assessment models, Catch-Maximum Sustainable Yield(CMSY) and Bayesian state-space(BSS) models were used. Results showed that the biomass of Largehead hairtail was estimated to be ‘Overfished’ in common by CMSY and BSS models. Specifically, as of 2020, the biomass was estimated to be 56% and 59% of the biomass which can produce maximum sustainable yield respectively. Based on the above results, the biomass change of Largehead hairtail and the profits (NPV) by TAC fishery according to the amount of TAC considering non-TAC over the next 30 years were examined with bioeconomic analysis. As results of bioeconomic analysis it was shown that resource recovery would be possible at the current level of TAC. However, it was shown that resource recovery would be impossible if the current TAC level would be increased by more than 20%. Futhermore, it was predicted that the biomass would not be increased if the catch of Non-TAC target fisheries would be increased by more than 50% from the current catch level. In addition, even if it would be reduced by 20% from the current TAC level, it was shown that all TAC fisheries would have positive profits.