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A study on the bycatches by mesh size of spring-net-pot in Geo-je & Tong-young waters of Korea

거제·통영해역 스프링그물통발의 망목별 혼획 연구

  • Cha, Bong-Jin (Fisheries System Engineering Division, National Fisheries Research & Development Institute) ;
  • Cho, Sam-Kwang (Fisheries System Engineering Division, National Fisheries Research & Development Institute) ;
  • Lee, Gun-Ho (Fisheries System Engineering Division, National Fisheries Research & Development Institute)
  • 차봉진 (국립수산과학원 시스템공학과) ;
  • 조삼광 (국립수산과학원 시스템공학과) ;
  • 이건호 (국립수산과학원 시스템공학과)
  • Received : 2010.07.16
  • Accepted : 2010.08.16
  • Published : 2010.08.31

Abstract

Test fishing was carried out using six kinds of different mesh sizes (20, 22, 24, 28, 35, 40mm) for springnet-pot to study bycatches according to the mesh size and catches survey was done for another one (mesh size : 22mm, entrance round : 350mm) in Geo-je & Tong-young waters of Korea. On the first sea experiment, it was thought that suitable mesh size of spring-net-pot catching conger-eel over 35cm with decreasing the catches of conger-eel (Conger myriaster) below 35cm was 24mm. On the second sea experiment, commercial catches were crabs (Charybdis bimaculata), octopus minor (Octopus variabilis) and others including conger-eel, and catches proportion was 60% of total catches weights. There was no big difference for the monthly catches. Self-consumption catches were 9 species including conger-eel below 35cm holding 50% of catches in the side of weights. There were 40% of bycatches for the catches weights and 63% for catches numbers in the 22mm mesh size of spring-net-pot having entrance round over 140mm. It showed that 50% of catches weights were discarded.

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