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.
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