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Performance of a conical jellyfish exclusion device installed in a trawl net

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Title: Performance of a conical jellyfish exclusion device installed in a trawl net
Authors: Park, Chang-Doo Browse this author
Lee, Kyounghoon Browse this author
Kim, Seong-Hun Browse this author
Fujimori, Yasuzumi Browse this author →KAKEN DB
Keywords: Jellyfish
Nemopilema nomurai
Jellyfish exclusion device
Issue Date: Jan-2012
Publisher: Springer
Journal Title: Fisheries science
Volume: 78
Issue: 1
Start Page: 23
End Page: 32
Publisher DOI: 10.1007/s12562-011-0416-x
Abstract: Recently, the increasing population of giant jellyfish Nemopilema nomurai has negatively affected coastal fisheries in Korea. As a result, the fishing industry has begun developing devices to prevent jellyfish capture. In this study, we assessed the performance of a conical jellyfish exclusion device in the coastal areas of Yokji Island in southern Korea during 2009. After hauling, we measured the length, diameter, and weight of the jellyfish and fish that were captured by the cod end and cover net. We found that the captured species included N. nomurai, silver croakers Pennahia argentata, yellow croakers Larimichthys polyactics, shotted halibut Eopsetta grigorjewi, largehead hairtails Trichiurus lepturus, and melon seeds Psenopsis anomala. The catch ratios of the giant jellyfish that entered the cod end in terms of weight ranged from 0.005 to 0.027. In contrast, the catch ratios of total fish in terms of weight and number were 0.793 and 0.835, respectively. On selectivity analysis of a conical separator for individual fish species, their exclusion ratios were independent of their length, and were similar to their observed exclusion ratios in terms of number. These results indicated that the conical jellyfish exclusion device performs well; however, some improvements are needed to minimize the escape of fish from the net.
Rights: © 2012 公益社団法人日本水産学会
© 2012 The Japanese Society of Fisheries Science
The final publication is available at
Type: article (author version)
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 藤森 康澄

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