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Relative efficiency and mesh selectivity of monofilament and twisted multifilament nylon gill net for Pacific saury, Cololabis saira, in the Northwest Pacific Ocean

북서태평양 꽁치 자망의 망지 재료에 따른 어획성능 및 망목선택성

  • Jo, Hyun-Su (Distant-Water Fisheries Resources Team, National Fisheries Research & Development Institute) ;
  • An, Doo-Hae (Distant-Water Fisheries Resources Team, National Fisheries Research & Development Institute) ;
  • Koh, Jeong-Rack (Distant-Water Fisheries Resources Team, National Fisheries Research & Development Institute) ;
  • Kim, Yeong-Seung (Distant-Water Fisheries Resources Team, National Fisheries Research & Development Institute) ;
  • Park, Chang-Doo (Fisheries Resources Management and Enhancement Team, West Sea Fisheries Research Institute, NFRDI)
  • 조현수 (국립수산과학원 해외자원팀) ;
  • 안두해 (국립수산과학원 해외자원팀) ;
  • 고정락 (국립수산과학원 해외자원팀) ;
  • 김영승 (국립수산과학원 해외자원팀) ;
  • 박창두 (국립수산과학원 서해수산연구소 자원관리조성팀)
  • Published : 2006.11.30

Abstract

To determine the relative efficiency and mesh selectivity of gill net for the Pacific saury, Cololabis saira, a series of fishing experiments was carried out in the Northwest Pacific Ocean from August 13 to October 13 in 2002, using gill nets of different mesh size(30, 33, 35, 37, 39 and 42mm) constructed from two kinds of twine material(monofilament, twisted multifilament nylon web). The relative efficiency of two material gears was expressed as the ratio obtained by dividing monofilament catch by multifilament catch in number. The master selection curve of each material gear was estimated by applying the extended Kitahara's method. The catch of experimental gears is mostly Pacific saury(98.6%), Cololabis saira. The kinds of bycatch are common squid(0.7%), Pacific mackerel(0.6%), etc. Catch comparisons in the two gears showed that monofilament nylon nets are 1.7 times more efficient. The optimum values in monofilament and multifilament gill net for Pacific saury are 8.28 and 8.23, respectively.

Keywords

Pacific saury;Gill net;Mesh selectivity;Kitahara's method

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