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

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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Recruitment characteristics of jack mackerel, Trachurus japonicus, in the waters around the Geumo Islands by using both sides fyke nets

각망을 이용한 금오열도 주변해역 전갱이의 연안가입특성 연구

  • Kim, Hee-Yong (Fisheries Resources and Environmental Division, Southwestern Sea Fisheries Research Institute, NFRDI) ;
  • Choi, Mun-Seong (Fisheries Resources and Environmental Division, Southwestern Sea Fisheries Research Institute, NFRDI) ;
  • Seo, Young-Il (Fisheries Resources and Environmental Division, Southwestern Sea Fisheries Research Institute, NFRDI) ;
  • Lee, Sun-Kil (Fisheries Resources and Environmental Division, Southwestern Sea Fisheries Research Institute, NFRDI) ;
  • Cha, Hyung-Kee (Fisheries Resources and Environmental Division, Southwestern Sea Fisheries Research Institute, NFRDI)
  • 김희용 (국립수산과학원 남서해수산연구소) ;
  • 최문성 (국립수산과학원 남서해수산연구소) ;
  • 서영일 (국립수산과학원 남서해수산연구소) ;
  • 이선길 (국립수산과학원 남서해수산연구소) ;
  • 차형기 (국립수산과학원 남서해수산연구소)
  • Received : 2011.10.10
  • Accepted : 2011.11.14
  • Published : 2011.11.30
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Abstract

Species composition of fishes and the recruitment properties of jack mackerel, Trachurus japonicus, in the waters around the Geumo Islands in the mid-South Sea were investigated by using both sides fyke nets every month from February to December 2010. During study period, a total of 30,503 fishes (1,380.4 kg) were collected and classified into 2 classes, 16 orders, 61 families and 121 species. The dominant species was jack mackerel occupying 80.5% of total individuals and 44.4% of total biomass. The fork length range of jack mackerel was 5.5-26.8 cm and individuals about 6 cm was appeared only in the middle and southern area of the Geumo Islands in May. The new recruitment of jack mackerel appeared from May in the waters around the Geumo Islands is probably caused by the warm water intrusion associated with the development of stratification due to the extinction of seasonal coastal cold waters by the increase of solar radiation heat. Furthermore, the jack mackerels less than 6 cm recruiting in the mid-South Sea in spring were considered as mixed ones by individuals spawned in the East China Sea and in the waters around the Jeju Island considering the collected time, migration period and spawning time of them.

Keywords

References

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