Korean Journal of Fisheries and Aquatic Sciences (한국수산과학회지)

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Estimating the Abundance and Fishing Mortality of Pacific Cod Gadus macrocephalus during the Spawning Season in Jinhae Bay, Korea, Using a Mark-Recapture Method

표지방류 조사를 통한 거제 외포 주변해역 대구(Gadus macrocephalus) 자원량과 어획사망률 추정

  • Hwang, Kang Seok (National Fisheries Research and Development Institute) ;
  • Choi, Ilsu (Department of Statistics, Chonnam National University) ;
  • Jung, Sukgeun (School of Marine Biomedical Sciences, Jeju National University)
  • 황강석 (국립수산과학원 자원관리과) ;
  • 최일수 (전남대학교 통계학과) ;
  • 정석근 (제주대학교 해양대학 해양의생명과학부)
  • Received : 2012.03.03
  • Accepted : 2012.10.03
  • Published : 2012.10.31
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Abstract

We estimated the population size and fishing mortality of Pacific cod Gadus macrocephalus during the spawning season in waters off Woipo, Geoje Island, Korea, using a mark-recapture method. We marked and released 51 cod>50 cm in total length; six were recaptured by local fishermen during the period from December 15 to 31, 2009. The estimated population size was ca. 180,000 and the fishing mortality of the exploitable cod was 26%. Although we could assume a closed population due to the short survey period, we evaluated the uncertainty in the estimates by applying bootstrap resampling because the sample size was small. The estimated 95% confidence interval was 94,000-568,000 for the population size and 8-49% for fishing mortality. Our study demonstrated that the application of mark-recapture methods and bootstrap resampling can be useful in stock assessment for fisheries management in Korea, but requires a larger sample size, spatially extensive coverage, and sophisticated mark-recapture models based on a refined sampling design for reliable stock assessment and biological reference points in sustainable cod management.

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References

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