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Analysis of mesh breaking loads in cotton gill nets: Possible solution to ghost fishing


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タイトル: Analysis of mesh breaking loads in cotton gill nets: Possible solution to ghost fishing
著者: Matsushita, Yoshiki / Machida, Shusuke / Kanehiro, Haruyuki / Nakamura, Fumio / Honda, Naoto
発行日: 2008年 4月
引用: Fisheries Science, 74(2), pp.230-235; 2008
抄録: A small number of fishers in Chiba Prefecture of eastern Japan use cotton gill nets to catch Japanese spiny lobster Panulirus japonicus. To examine the advantages of cotton gill nets, we analyzed changes in mesh breaking load of a new cotton gill net used in a fishing operation. A new cotton gill net was also soaked in a seawater tank to simulate ghost fishing conditions. The average mesh breaking load of new cotton mesh was 50.3 N. This value decreased to 19.0 N after 38 days (∼912 h), and after 82 days (∼1968 h) the mesh could be easily torn (breaking load 0.07 N). Under fishing conditions, the cumulative soak time was only 744.4 h over 19 months. The average breaking load at the end of this period was 43.1 N, a strength 86% that of the presoaked mesh. The mesh breaking load of a cotton gill net continuously soaked for 744.4 h was 26.1 N, as estimated from tank experiment data. Thus, a cotton gill net maintains reasonable strength under typical use conditions, but will degrade if lost at sea.
キーワード: Cotton fiber / Degradation / Ghost fishing / Gill net / Japanese spiny lobster / Mesh breaking load
URI: http://hdl.handle.net/10069/22667
ISSN: 09199268
DOI: 10.1111/j.1444-2906.2008.01517.x
権利: © 2008 Japanese Society of Fisheries Science
資料タイプ: Journal Article
原稿種類: author
出現コレクション:080 学術雑誌論文

引用URI : http://hdl.handle.net/10069/22667

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