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

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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Species composition of the catches collected by trammel net in the coastal waters off Ulleungdo of Korea

울릉도해역에서 삼중자망에 의한 어획물의 종조성

  • CHUNG, Sangdeok (Coastal Water Fisheries Resources Research Division, National Institute of Fisheries Science) ;
  • CHA, Hyung Kee (Coastal Water Fisheries Resources Research Division, National Institute of Fisheries Science) ;
  • LEE, Jae Bong (Distant Water Fisheries Resources Research Division, National Institute of Fisheries Science) ;
  • LEE, Hae Won (Research Cooperation Division, National Institute of Fisheries Science) ;
  • YANG, Jae Hyeong (Dokdo Fisheries Research Center, National Institute of Fisheries Science)
  • 정상덕 (국립수산과학원 연근해자원과) ;
  • 차형기 (국립수산과학원 연근해자원과) ;
  • 이재봉 (국립수산과학원 원양자원과) ;
  • 이해원 (국립수산과학원 대외협력과) ;
  • 양재형 (국립수산과학원 독도수산연구센터)
  • Received : 2015.09.21
  • Accepted : 2015.11.26
  • Published : 2015.11.30
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Abstract

Species composition in the coastal waters off Ulleungdo of Korea were examined based on catches bimonthly collected by trammel net in 2013. A total of 711 individuals and 181.9 Kg were caught and catches were composed of 4 classes 15 orders 27 families 52 species including 44 Pisces, 4 Gastropoda, 3 Cephalopoda, and 1 Echinodermata. The dominant species in biomass were File fish (Thamnaconus modestus), Atka mackerel (Pleurogrammus azonus), and Greenling (Hexagrammos otakii). Data were summarized using hierarchical cluster analysis (HCA) and detrended correspondence analysis (DCA) to examine similarity in species composition for each month, and community structure in Ulleungdo was divided into two groups. Community structures in February, April and December with low temperature and well-mixed surface water were distinguished from those in June, August and October with high temperature and strong stratification, which could be attributed to temporal changes in dominant species. Atka mackerel and Spear squid mainly caught in February and April, disappearing in June, August and October, and File fish outburst was shown in October. Because the water off Ulleungdo has been under low human pressure, it could be a good case study to elucidate effects of climate change on community structure and ecosystem in the East sea. Continuous surveys and further studies are required to demonstrate migration route and distribution of dominant species and long-term changes in community structure in the water of Ulleungdo.

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