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Fishing investigation of vertical bottom longline fisheries in sea mount of central northern Pacific

북태평양 중부 해산어장에 있어서 저층 선주낙의 어획실태

  • Oh, Taeg-Yun (Distant Wafer Fisheries Resource Team, National Fisheries Research and Development Institute) ;
  • Kim, Yeong-Seung (Distant Wafer Fisheries Resource Team, National Fisheries Research and Development Institute) ;
  • Cho, Sam-Kwang (Fisheries Resource and Environment Team, West sea fisheries Research Institute, NFRDI) ;
  • Kim, In-Ok (Fisheries Engineering Team, NFRDI) ;
  • Choi, Seok-Gwan (Distant Wafer Fisheries Resource Team, National Fisheries Research and Development Institute) ;
  • Koh, Jeong-Rack (Distant Wafer Fisheries Resource Team, National Fisheries Research and Development Institute) ;
  • Yang, Won-Seok (Distant Wafer Fisheries Resource Team, National Fisheries Research and Development Institute)
  • 오택윤 (국립수산과학원 원양자원팀) ;
  • 김영승 (국립수산과학원 원양자원팀) ;
  • 조삼광 (국립수산과학원 서해수산연구소 자원환경팀) ;
  • 김인옥 (국립수산과학원 수산공학팀) ;
  • 최석관 (국립수산과학원 원양자원팀) ;
  • 고정락 (국립수산과학원 원양자원팀) ;
  • 양원석 (국립수산과학원 원양자원팀)
  • Published : 2005.08.31

Abstract

This study was conducted to survey the catches of vertical bottom longline fisheries in the sea mount of central northern Pacific($30^{\circ}-42^{\circ}N$, $170^{\circ}-175^{\circ}E$), during the period of July 1 to August 25,2004 by commercial fishing vessel. The number of 57 test fishing was carried out in the central northern Pacific during 43 days and the total catches were 21,092.4kg as 19 fish species, CPUE/day and catches/day were 185 baskets and 490.5kg, respectively. Main fish species caught from the experimental fishing were Squalus mitsukurii (66.3%), Coelorhyrchus asperocephaius (11.7%) and Helicolenus avius (9.8%) and, average inside diameter for fish mouth was 4.0cm over. Catch ratio according to each fishing ground was the order of F, D, J, B and C. Catch ratio fur water depth was the order of 450-500m, 350-400m, 300-350m, 400-450m, 1000-1100m and 500-550m and, main species by water depth was Squalus mitsukurii for 300-400m, Etmopterus lucifer for 300-550m, Coelorhyrchus asperocephaius far 1,000m over. Catch ratio according to the kind of hooks was higher at the hook no.6 for Squalus mitsukurii and no. 5 for Etmopterus lucifer and, catch ratio by baits was higher at squid for Squalus mitsukurii, saury and eel for Helicolemus avius and saury for Etmopterus lucifer. Accordingly, it is thought that the extension of fishing hours is needed with the reduction of damage and loss for fishing gears during fishing operation.

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