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Mesh selectivity of multifilament nylon gillnet for ocellate spot skate (Okamejei kenojei) in the western sea of Korea

자망에 의한 홍어의 망목선택성

  • Kim, In-Ok (Aquaculture Industry Division, West Sea Fisheries Research Institute, National Fisheries Research & Development Institute) ;
  • Lee, Gun-Ho (Aquaculture Industry Division, West Sea Fisheries Research Institute, National Fisheries Research & Development Institute) ;
  • Sohn, Byung-Kyu (Ecology and Environment Division, Jeju Branch, Korea Fisheries Resources Agency)
  • 김인옥 (국립수산과학원 서해수산연구소 해역산업과) ;
  • 이건호 (국립수산과학원 서해수산연구소 해역산업과) ;
  • 손병규 (한국수산자원관리공단 제주지사 생태환경실)
  • Received : 2013.08.12
  • Accepted : 2013.10.16
  • Published : 2013.11.30

Abstract

To estimate the mesh selectivity of gillnet for ocellate spot skate (Okamejei kenojei), the field tests were carried out 12 times with six different mesh sizes (121.2mm, 137.7mm, 151.5mm, 168.3mm, 178.2mm, 189.4mm) in the coastal waters of Taean, Chungcheongnamdo of Korea, 2010~2011. In the field tests, the total number of species was 31, and that of catch was 1,410 and the total weight was 618,006g. The number and weight of ocellate spot skate which is main target in this study were 1,004 and 434,592g, respectively. The catch in number of ocellate spot skate occupied about 71.2% in total catch. The others of catch species were marbled sole (8.4%), sea raven (4.4%), japanese swimming crab (4.2%) and flatfish (4.1%) and so on. The range of body disk width (DW) of ocellate spot skates which were caught in this study was 15.2~35cm and the mode was 27~29cm. The estimation equation of mesh selectivity using the extended Kitahara's method was expressed as s $(R)=s(DW/m)={\exp}\{(-0.56R^3-1.80R^2+12.96R-9.99)-4.26\}$. The optimum value of DW/m for 1.0 of retention probability in this estimation equation was estimated 1.899 and DW/m was estimated to be 1.194, 1.314, 1.395, 1.461 and 1.520 when the retention probability were 0.1, 0.2, 0.3, 0.4 and 0.5, respectively. When applied to the retention probability of 0.5, the optimum mesh size was estimated to be 177.0mm on first maturity disk width 26.9cm of ocellate spot skate.

Acknowledgement

Grant : 친환경 수산자재 및 어구어법

Supported by : 국립수산과학원

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