The Journal of Fisheries Business Administration (수산경영론집)

The Korean Society of Fisheries Business Administration (한국수산경영학회)
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Estimating Optimal Harvesting Production of Yellow Croaker Caught by Multiple Fisheries Using Hamiltonian Method

해밀토니안기법을 이용한 복수어업의 참조기 최적어획량 추정

  • Nam, Jong-Oh (Division of Economics, College of Humanities & Social Sciences, Pukyong National University) ;
  • Sim, Seong-Hyun (Department of Applied Economics, Graduate School, Pukyong National University) ;
  • Kwon, Oh-Min (Department of Applied Economics, Graduate School, Pukyong National University)
  • 남종오 (국립부경대학교 인문사회과학대학 경제학부) ;
  • 심성현 (국립부경대학교 일반대학원 응용경제학과) ;
  • 권오민 (국립부경대학교 일반대학원 응용경제학과)
  • Received : 2015.07.20
  • Accepted : 2015.08.19
  • Published : 2015.08.31
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Abstract

This study aims to estimate optimal harvesting production, fishing efforts, and stock levels of yellow croaker caught by the offshore Stow Net and the offshore Gill Net fisheries using the current value Hamiltonian method and the surplus production model. As analyzing processes, firstly, this study uses the Gavaris general linear model to estimate standardized fishing efforts of yellow croaker caught by the above multiple fisheries. Secondly, this study applies the Clarke Yoshimoto Pooley(CY&P) model among the various exponential growth models to estimate intrinsic growth rate(r), environmental carrying capacity(K), and catchability coefficient(q) of yellow croaker which inhabits in offshore area of Korea. Thirdly, the study determines optimal harvesting production, fishing efforts, and stock levels of yellow croaker using the current value Hamiltonian method which is including average landing price of yellow croaker, average unit cost of fishing efforts, and social discount rate based on standard of the Korean Development Institute. Finally, this study tries sensitivity analysis to understand changes in optimal harvesting production, fishing efforts, and stock levels of yellow croaker caused by changes in economic and biological parameters. As results drawn by the current value Hamiltonian model, the optimal harvesting production, fishing efforts, and stock levels of yellow croaker caught by the multiple fisheries were estimated as 19,173 ton, 101,644 horse power, and 146,144 ton respectively. In addition, as results of sensitivity analysis, firstly, if the social discount rate and the average landing price of yellow croaker continuously increase, the optimal harvesting production of yellow croaker increases at decreasing rate and then finally slightly decreases due to decreases in stock levels of yellow croaker. Secondly, if the average unit cost of fishing efforts continuously increases, the optimal fishing efforts of the multiple fisheries decreases, but the optimal stock level of yellow croaker increases. The optimal harvest starts climbing and then continuously decreases due to increases in the average unit cost. Thirdly, when the intrinsic growth rate of yellow croaker increases, the optimal harvest, fishing efforts, and stock level all continuously increase. In conclusion, this study suggests that the optimal harvesting production and fishing efforts were much less than actual harvesting production(35,279 ton) and estimated standardized fishing efforts(175,512 horse power) in 2013. This result implies that yellow croaker has been overfished due to excessive fishing efforts. Efficient management and conservative policy on stock of yellow croaker need to be urgently implemented.

Keywords

References

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