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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on July 11, 2007
ICES Journal of Marine Science: Journal du Conseil 2007 64(6):1152-1160; doi:10.1093/icesjms/fsm103
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Crown Copyright © 2007. Published by Oxford Journals on behalf of the International Council for the Exploration of the Sea. All rights reserved

Influence of El Niño/La Niña on the western winter–spring cohort of neon flying squid (Ommastrephes bartramii) in the northwestern Pacific Ocean

Xin Jun Chen1,, Xiao Hu Zhao1 and Yong Chen2

1 College of Marine Science and Technology, Shanghai Fisheries University, PO Box 67, Jungong Road 334, Shanghai 200090, People's Republic of China
2 School of Marine Sciences, 218 Libby Hall, University of Maine, Orono, ME 04469, USA

Correspondence to X. J. Chen: tel: +86-21-65711303; fax: +86-21-65710389, e-mail: xjchen{at}shfu.edu.cn

Chen, X. J., Zhao, X. H., and Chen, Y. 2007. Influence of El Niño/La Niña on the western winter–spring cohort of neon flying squid (Ommastrephes bartramii) in the northwestern Pacific Ocean. – ICES Journal of Marine Science, 64: 1152–1160.

Ommastrephes bartramii is an oceanic squid distributed widely in the North Pacific, and its western winter–spring cohort is the target of a traditional squid fishery. Commercial fisheries data from the Chinese mainland squid-jigging fleet for the period 1995–2004 were analysed with respect to environmental variables. Sea surface temperature anomalies (SSTA) in the Niño 3.4 region had the strongest negative correlation with the SSTA of feeding and spawning grounds of the squid, with a time-lag of three and eight months (p < 0.05), respectively. A La Niña event would result in a decrease in squid recruitment through variability in environmental conditions on the spawning grounds, whereas an El Niño event would lead to environmental conditions favourable to squid recruitment. El Niño/La Niña events also influenced squid distribution on the feeding grounds, resulting in a northward shift of the fishing grounds in La Niña years and a southward shift in El Niño years. A multiple linear regression equation was derived to describe the dependence of the squid abundance index on environmental variables.

Keywords: abundance index, El Niño, La Niña, northwestern Pacific, Ommastrephes bartramii, sea surface temperature anomaly

Received 5 September 2006; accepted 7 June 2007; advance access publication 11 July 2007.


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