日本水産工学会誌
Online ISSN : 2189-7131
Print ISSN : 0916-7617
ISSN-L : 0916-7617
カイト式表中層トロール網の開発
熊沢 泰生胡 夫祥渡部 俊広木下 弘実東海 正
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ジャーナル オープンアクセス

2010 年 46 巻 3 号 p. 197-204

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A pelagic and/or mid water trawl using canvas kites as net-mouth opening device was developed. The wing kites for horizontal net-mouth opening and the para-kites for vertical opening were designed and the optimum dimension of kites was determined according to the drag of a trawl net of 25.96m in total length. As a result of sea trials using the trawl net, the height of the net-mouth was kept to be 6.03m on average and little change in the height of the net-mouth was observed, within the wide towing speed from 1.55m/s to 2.58m/s. The depth of the cod-end was also maintained at the same level as the center of the net-mouth. The drag of the trawl net was approximately 17.8kN at a towing speed of 2.06m/s (4knot). In addition, working depth of the net was controllable with change in the warp length, but at a given warp length the depth of mid water trawl with canvas kites was almost half of that of the one with conventional otter boards.

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© 2010 日本水産工学会
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