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http://dx.doi.org/10.3796/KSFT.2010.46.4.302

The performance of a wedge type jellyfish excluder device inserted in a trawl net  

Park, Chang-Doo (Fisheries system engineering Division, NFRDI)
Kim, In-Ok (Aquaculture Industry Division, West Sea Fisheries Research Institute)
Lee, Kyoung-Hoon (Fisheries system engineering Division, NFRDI)
Lee, Gun-Ho (Fisheries system engineering Division, NFRDI)
Park, Seong-Wook (Fisheries system engineering Division, NFRDI)
Publication Information
Journal of the Korean Society of Fisheries and Ocean Technology / v.46, no.4, 2010 , pp. 302-312 More about this Journal
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.
Keywords
Jellyfish; Nemopilema nomurai; Trawl; Wedge type; Jellyfish excluder device; Catch ratio; Exclusion ratio;
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