Journal of the Korean Society of Fisheries and Ocean Technology (수산해양기술연구)

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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Management of small yellow croaker stock in Korean waters based on production value-per-recruit analysis

가입당 생산액 분석에 의한 한국 해역 참조기 Larimichthys polyactis 자원의 관리

  • Zhang, Chang-Ik (Department of Marine Production System Management, Pukyong National University) ;
  • Lee, Eun-Ji (Department of Marine Production System Management, Pukyong National University) ;
  • Kang, Hee-Joong (Department of Marine Production System Management, Pukyong National University)
  • 장창익 (부경대학교 해양생산시스템관리학부) ;
  • 이은지 (부경대학교 해양생산시스템관리학부) ;
  • 강희중 (부경대학교 해양생산시스템관리학부)
  • Received : 2014.09.18
  • Accepted : 2014.11.18
  • Published : 2014.11.30
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Abstract

This study was performed to estimate optimum fishing mortality (F) and the age at first capture ($t_c$) for small yellow croaker in Korean waters. We first estimated optimum F and $t_c$ using traditional yield-per-recruit (YPR) analysis, and the results were 0.8/year and 2.5 years old, respectively. However, the individual fish price per unit weight of small yellow croaker in Korea increases dramatically by size. Thus, we developed an alternative method, which is called as production value-per-recruit (PPR) analysis. We developed two types of the PPR analysis, that is, the discrete function and the continuous function method. We estimated optimum F and $t_c$ using the two types of the PPR analysis and compared the results. The optimum F and $t_c$ from the discrete function method, were 0.3/year and 5.0 years old, respectively, while those from the continuous function method were 0.5/year and 3.5 years old, respectively. These PPR estimates were much more conservative for the stock management than the traditional YPR analysis, which can prevent the fish stock from the economic overfishing. As a result, the PPR analysis could be more proper approach for stock assessment in the case that the individual fish price per unit weight increases dramatically by size like small yellow croaker in Korea.

Keywords

References

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