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

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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The performance of a wedge type jellyfish excluder device inserted in a trawl net

트롤 어구에 부착된 쐐기형 해파리 분리배출장치의 성능 연구

  • 박창두 (국립수산과학원 시스템공학과) ;
  • 김인옥 (국립수산과학원 서해수산연구소 해역산업과) ;
  • 이경훈 (국립수산과학원 시스템공학과) ;
  • 이건호 (국립수산과학원 시스템공학과) ;
  • 박성욱 (국립수산과학원 시스템공학과)
  • Received : 2010.08.12
  • Accepted : 2010.10.04
  • Published : 2010.11.30
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Abstract

In order to describe the performance of a wedge type jellyfish excluder device, a series of fishing experiments was carried out in the coastal areas of Yokji Island, southern Korea in 2009, using a trawl net with a cover net. The body size and weight of each individual (fish or jellyfish) caught in the experimental fishing were measured. In the case of giant jellyfish the bell diameter and weight were measured. The catch species was composed of giant jellyfish (Nemopilema nomurai), silver croaker (Pennahia argentata), yellow croaker (Larimichthys polyactics), finespotted flounder (Pleuronichthys cornutus), largehead hairtail (Trichiuruslepturus), melon seed (Psenopsisanomala) and so on. The weight ratio and individual ratio of total fish escaped through the outlet of the excluder device were 0.322 and 0.320, respectively. The weight ratios of giant jellyfish excluded from the trawl net ranged from 0.740 to 0.921 (average 0.852/haul). It means that the wedge type jellyfish excluder device performed well and allowed the most of the giant jellyfish to exclude through the trawl net. The approximately 70% of fish entered in trawl net was caught. The wedge type excluder device needs some improvements to minimize the fish escape from the trawl nets in the future.

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References

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