Korean Journal of Fisheries and Aquatic Sciences (한국수산과학회지)

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Stock Assessment and Optimal Catch of Blackfin Flounder Glyptocephalus stelleri in the East Sea, Korea

한국 동해안 기름가자미(Glyptocephalus stelleri)의 자원평가 및 적정어획량 추정

  • Sohn, Myoung Ho (Fisheries Resources and Environment Division, East Sea Fisheries Research Institute, National Fisheries Research & Development Institude) ;
  • Yang, Jae Hyeong (Dokdo Fisheries Research Institute, National Fisheries Research & Development Institude) ;
  • Park, Jeong-Ho (Fisheries Resources and Environment Division, East Sea Fisheries Research Institute, National Fisheries Research & Development Institude) ;
  • Lee, Haewon (Dokdo Fisheries Research Institute, National Fisheries Research & Development Institude) ;
  • Choi, Young Min (Fisheries Resources and Environment Division, East Sea Fisheries Research Institute, National Fisheries Research & Development Institude) ;
  • Lee, Jae Bong (Dokdo Fisheries Research Institute, National Fisheries Research & Development Institude)
  • 손명호 (국립수산과학원 동해수산연구소 자원환경과) ;
  • 양재형 (국립수산과학원 동해수산연구소 독도수산연구센터) ;
  • 박정호 (국립수산과학원 동해수산연구소 자원환경과) ;
  • 이해원 (국립수산과학원 동해수산연구소 독도수산연구센터) ;
  • 최영민 (국립수산과학원 동해수산연구소 자원환경과) ;
  • 이재봉 (국립수산과학원 동해수산연구소 독도수산연구센터)
  • Received : 2013.06.03
  • Accepted : 2013.08.20
  • Published : 2013.10.31
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Abstract

The blackfin flounder Glyptocephalus stelleri is a commercially important species in the East Sea of Korea, but its catches and biomass have decreased gradually in recent years. This study estimated the optimal catch (acceptable biological catch, ABC) for the effective management of this species by estimating population ecology parameters and the stock biomass of blackfin flounder in the East Sea of Korea. The estimated instantaneous coefficient of total mortality (Z) of blackfin flounder was 1.0542/year, the survival rate (S) was 0.3485, and the instantaneous coefficient of natural mortality (M) was 0.3637/year. From the values of S and M, the instantaneous coefficient of fishing mortality (F) was calculated to be 0.6905/year. The age at first capture was 1.304 years, and the total length was 11.5 cm at that time. On the basis of these parameters, the annual biomass was estimated by a biomass-based cohort analysis using annual catch data in weight by year for 1991-2012 in the East Sea of Korea. The annual biomass peaked in 1997 at about 12,800 mt and then subsequently declined continuously to a level of 10,500 mt in 2004 and to 9,800 mt in 2011 and 2012. The maximum sustainable yield and $F_{0.1}$ were estimated as 3,547 mt and 0.3595/year, respectively. Using these estimations, the ABC was estimated to be 3,571 mt in tier 5, 3,397 mt in tier 4, and 2,622 mt in tier 3.

Keywords

References

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