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Weight-based yield per recruitment and spawning-biomass per recruitment analyses of Pacific cod Gadus macrocephalus off the Pacific coast of southern Hokkaido, Japan

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タイトル: Weight-based yield per recruitment and spawning-biomass per recruitment analyses of Pacific cod Gadus macrocephalus off the Pacific coast of southern Hokkaido, Japan
著者: Ueda, Yuji 著作を一覧する
Matsuishi, Takashi 著作を一覧する
キーワード: Gadus macrocephalus
Pacific cod
SPR (spawning-biomass per recruitment)
weight-based
YPR (yield per recruitment)
stock assessment
発行日: 2005年 8月
出版者: Blackwell Publishing
誌名: Fisheries Science
巻: 71
号: 4
開始ページ: 799
終了ページ: 804
出版社 DOI: 10.1111/j.1444-2906.2005.01030.x
抄録: The present study assessed the stock state of Pacific cod Gadus macrocephalus caught off the coast of southern Hokkaido, Japan. Weight-based yield per recruitment (YPR) and spawning-biomass per recruitment (SPR) analyses were used for this assessment. The current fishing mortality (average from 1998 to 2000) was 0.65 and weight at first capture was 0.5 kg bodyweight. Under these fishing pressures, the YPR of Pacific cod in southern Hokkaido was 1.06 kg/recruitment and percentage of SPR (%SPR) was 6.9%. The %SPR was lower than the critical limit at 20%SPR. The main reason that values of both YPR and %SPR were not optimum, would be that the weight at first capture was too small. Raising the weight at first capture was thought to be a better strategy from the biological viewpoint, and reducing fishing mortality to 0.3 would be the next alternative strategy from the fisheries management viewpoint.
Rights: Copyright (c) 2005 the Japanese Society of Fisheries Science(日本水産学会)
©2005 公益社団法人日本水産学会 The Japanese Society of Fisheries Science
資料タイプ: article (author version)
URI: http://hdl.handle.net/2115/616
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 松石 隆

 

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