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Dominant causes on the catch fluctuation of a set net fishery in the mid-south sea of Korea

남해 중부해역 정치망어업 어획량 변동의 원인

  • Kim, Heeyong (Fisheries Resources and Environmental Division, Southwestern Sea Fisheries Research Institute, NFRDI) ;
  • Song, Se Hyun (Fisheries Resources and Environmental Division, Southwestern Sea Fisheries Research Institute, NFRDI) ;
  • Lee, Sunkil (Fisheries Resources and Environmental Division, Southwestern Sea Fisheries Research Institute, NFRDI) ;
  • Kim, Jong-Bin (Fisheries Resources and Environmental Division, Southwestern Sea Fisheries Research Institute, NFRDI) ;
  • Yoo, Joon-Taek (Fisheries Resources and Environmental Division, Southwestern Sea Fisheries Research Institute, NFRDI) ;
  • Jang, Dae-Soo (Fisheries Resources and Environmental Division, Southwestern Sea Fisheries Research Institute, NFRDI)
  • 김희용 (국립수산과학원 남서해수산연구소 자원환경과) ;
  • 송세현 (국립수산과학원 남서해수산연구소 자원환경과) ;
  • 이선길 (국립수산과학원 남서해수산연구소 자원환경과) ;
  • 김종빈 (국립수산과학원 남서해수산연구소 자원환경과) ;
  • 유준택 (국립수산과학원 남서해수산연구소 자원환경과) ;
  • 장대수 (국립수산과학원 남서해수산연구소 자원환경과)
  • Received : 2013.03.14
  • Accepted : 2013.07.04
  • Published : 2013.08.31

Abstract

The annual and monthly fluctuation in the species composition and the catch abundance of dominant species were analyzed using the daily sales slip catch data by a set net in the offshore waters off Dolsan Island in Yeosu from March 2004 to December 2011. Mean catch from 2004 to 2011 is 372M/T and the maximum and the minimum catch are 526 M/T in 2005 and 27 2M/T in 2009, respectively. The dominant species were Engraulis japonicus mainly in spring and Scomberomorous niphonius in Autumn and therefore the set net catch that is dominated by S. niphonius's catch was much higher in autumn than in spring. Through comparative analyses for the environmental factors to the annual catch fluctuation, it is revealed that the water temperature variation affected the recruitment property of S. niphonius to the fishing ground but the effect of typhoon on the catch fluctuation was not distinct. Furthermore, the big blooming event of jellyfish, particularly Nemopilema nomurai, that occurred in 2009 showed a tendency of faster appearance and later extinction until December. The occurring characteristic of N. nomurai became a direct cause that brought about the lowest total catch in 2009 since the dominant species catch of the set net fishery was concentrated mostly in Autumn.

Acknowledgement

Supported by : 국립수산과학원

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