The influence of warp length on trawl dimension and catch of walleye pollock Theragra chalcogramma in a bottom trawl survey

Fujimori, Yasuzumi; Chiba, Kenji; Oshima, Tatsuki; Miyashita, Kazushi; Honda, Satoshi

The influence of warp length on trawl dimension and catch of walleye pollock Theragra chalcogramma in a bottom trawl survey

Fujimori, Yasuzumi; Chiba, Kenji; Oshima, Tatsuki et al.

Fisheries Science, 2005, 71(4), 738-747

Permalink : https://hdl.handle.net/2115/623

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アクセス権	open access
URI	https://hdl.handle.net/2115/623
タイトル	The influence of warp length on trawl dimension and catch of walleye pollock Theragra chalcogramma in a bottom trawl survey
タイトル	スケトウダラ着底トロール調査におけるワープ長の違いが網形状と漁獲に与える影響
著者	Fujimori, Yasuzumi ; Chiba, Kenji ; Oshima, Tatsuki ; Miyashita, Kazushi ; Honda, Satoshi
e-Rad_Researcher 40261341 著者名 Fujimori, Yasuzumi 藤森, 康澄
著者名 Chiba, Kenji
著者名 Oshima, Tatsuki
e-Rad_Researcher 70301877 著者名 Miyashita, Kazushi
著者名 Honda, Satoshi
言語	英語
キーワード	footgear contact
	trawl dimension
	trawl survey
	walleye pollock
	warp length
発行日	2005-08
出版者	Blackwell Publishing
収録物名	Fisheries Science
巻(号)	71(4)
ページ	738-747
抄録	We examined variation in trawl dimension, bottom contact, and catch with differing warp lengths during walleye pollock surveys conducted by the Fisheries Research Agency. The ratio of warp length to fishing depth (scope ratio) was set at 2.5, 3.0 and 3.5 at depths of 110 m. At a 2.5 scope ratio, the net mouth shape and footgear contact fluctuated, as the trawl door did not contact the bottom. Footgear contact was complete when the scope ratio was 3.0 or more. Walleye pollock, sculpins, and flatfishes were the main catch in all tows, and the catch increased with scope ratio. There was no difference in the length frequency of n= 300 walleye pollock captured at 2.5 and 3.0 scope ratio. However, the length frequency at 3.5 was significantly different from that of other scope ratios. These results suggest the following: at a scope ratio of 3.0 or more, the trawl door will not leave the bottom at any depths. To compliment echo surveys for walleye pollock, a 3.0 scope ratio would be optimal, since the catch data for a 3.5 scope ratio was dissimilar from that of scope ratios.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
権利情報	© 2005 公益社団法人日本水産学会
権利情報	© 2005 The Japanese Society of Fisheries Science
PISSN	09199268
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1111/j.1444-2906.2005.01023.x