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

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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Long-term changes in the small yellow croaker, Larimichthys polyactis, population in the Yellow and East China Seas

황해 및 동중국해 참조기, Larimichthys polyactis 자원의 장기변동

  • Yeon, In-Ja (Fisheries Resources Management Division, National Fisheries Research & Development Institute) ;
  • Lee, Dong-Woo (Fisheries Resources Management Division, National Fisheries Research & Development Institute) ;
  • Lee, Jae-Bong (Fisheries Resources Management Division, National Fisheries Research & Development Institute) ;
  • Choi, Kwang-Ho (Fisheries Resources Management Division, National Fisheries Research & Development Institute) ;
  • Hong, Byung-Kyu (Dokdo Fisheries Research Center, East Sea Fisheries Research Institute, NFRDI) ;
  • Kim, Joo-Il (Southeast Sea Fisheries Research Institute, NFRDI) ;
  • Kim, Young-Seop (Research and Development Planing Department, NFRDI)
  • 연인자 (국립수산과학원 자원관리과) ;
  • 이동우 (국립수산과학원 자원관리과) ;
  • 이재봉 (국립수산과학원 자원관리과) ;
  • 최광호 (국립수산과학원 자원관리과) ;
  • 홍병규 (국립수산과학원 독도수산연구센터) ;
  • 김주일 (국립수산과학원 남동해수산연구소) ;
  • 김영섭 (국립수산과학원 연구기획부)
  • Received : 2010.11.04
  • Accepted : 2010.11.16
  • Published : 2010.11.30
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Abstract

The population of small yellow croaker, Larimichthys polyactis, in the Yellow and East China Seas has decreased significantly since the mid 1970s. Several management measures have been introduced to conserve it, but population size remains low. To rebuild this population, it is now necessary to consider more effective management methods based on the stock assessment. To determine long-term population changes, fishery and biological data collected over 34 years (1969-2002) were analysed. Yearly fish length compositions were analysed for the time periods 1968 through 1970, 1978 through 1982, and 1993 through 2002; and catch data was available from 1969 to 2002. Annual population sizes were calculated based on length composition, the relationship between total length and body weight, and total landings. Analyses showed that since the 1970s, average size of harvested fish decreased; the proportion of less mature fish (smaller than the 50% maturity length, 19cm) in catches has increased and the estimated biomass has decreased significantly. Consequently, the main management recommendation is that juvenile fish need to be better protected to allow the rebuilding of resources to a more sustainable population level. This will require fish size limit, permissible mesh size, and closed area and season regulations.

Keywords

References

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