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

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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Opening efficiency and selectivity of Double-level type and Grid type in the shrimp beam trawl net

상하식과 그리드식 새우조망 어구의 전개성능과 선택성

  • Jang, Choong-Sik (Institute of Marine Industry, Department of Marine Production Technology, Graduate School, Gyeongsang National University) ;
  • Cho, Youn-Hyoung (Institute of Marine Industry, Department of Marine Production Technology, Graduate School, Gyeongsang National University) ;
  • An, Young-Su (Institute of Marine Industry, Department of Marine Production Technology, Graduate School, Gyeongsang National University)
  • 장충식 (경상대학교 해양생산공학과/해양산업연구소) ;
  • 조윤형 (경상대학교 해양생산공학과/해양산업연구소) ;
  • 안영수 (경상대학교 해양생산공학과/해양산업연구소)
  • Received : 2014.08.04
  • Accepted : 2014.08.22
  • Published : 2014.08.31
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Abstract

The experiments were carried out to decide the selective fishing gear of the shrimp beam trawl fishery. The model nets were made of General type, Double-level type and Grid type. The model experiments were carried out to test opening efficiency and towing tension. The experimental tanks were the flume tank [$8.0L{\times}2.8W{\times}1.4H(m)$] and the towing tank [$85L{\times}10W{\times}3.5H(m)$] in National Fisheries Research and Development Institute. The full scale experiments were carried out to compare the selectivity of General type net, Double-level type net and Grid type net in the southern sea of korea. The vertical opening (net height) of the model nets can be expressed as a function of the towing velocity as the straight line. The towing tension of the model nets can be expressed as a function of the towing velocity as the parabola. The shrimp catching rates of upper cod end in Boryeong and tongyeong were 78%, 9% respectively, but the rates of lower cod end were 23%, 91% respectively. The number bycatch rates of General type and Grid type were 23%, 11% respectively, and the weight bycatch rates were 34%, 31% respectively. A selective shrimp beam trawl net is Grid type in korea coastal sea.

Keywords

References

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