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

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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A study on the selectivity of grid type escape device for the reduction of small size of fish in set net

정치망의 치어혼획저감을 위한 그리드형 탈출장치의 선택성에 관한 연구

  • Kim, Tae-Kyung (Department of Fisheries Physics, Graduation school, Pukyong National University) ;
  • Kim, Hyung-Seok (Division of Marine Production System Management, Pukyong National University) ;
  • Lee, Ju-Hee (Division of Marine Production System Management, Pukyong National University) ;
  • Kim, Seonghun (Fisheries system engineering Division, NFRDI)
  • 김태경 (부경대학교 대학원 수산물리학과) ;
  • 김형석 (부경대학교 해양생산시스템관리학부) ;
  • 이주희 (부경대학교 해양생산시스템관리학부) ;
  • 김성훈 (국립수산과학원 시스템공학과)
  • Received : 2013.05.24
  • Accepted : 2013.07.10
  • Published : 2013.08.31
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Abstract

This thesis is the fundamental study on the adaptation of escape device for reducing small size of fish in set-net. The escape devices for experiments were made the grid-type devices with three different slit sizes (15, 20 and 25mm). The experiments of size selectivity on escape devices were conducted by using two kinds of species as black rockfish (Sebastes schlegeli) and sea perch (Lateolabrax maculatusi) in the experimental tank. The size selectivity curve was fitted by using a logistic function and the parameters of selectivity curve were estimated by a maximum likelihood method. In the results; 50% selection ranges for the grid-type escape devices with three different slit sizes were; a black rockfish was 13.30, 19.22 and 22.06cm and a sea perch was 17.64, 20.91 and 22.78cm, respectively. The 50% selection range of a black rockfish was wilder than a sea perch about 1.1~1.3 time. Therefore, the small size of fish are able to reduce by using the grid type escape device. However, the optimum slit size of grid should be decided to consider the size of target species and economics of catches.

Keywords

References

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