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ICES Journal of Marine Science: Journal du Conseil 2005 62(7):1463-1474; doi:10.1016/j.icesjms.2005.08.003
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© 2005 International Council for the Exploration of the Sea

The effect of abiotic and biotic factors on the importance of macroplankton in the diet of Northeast Arctic cod in recent years

E.L. Orlova*, A.V. Dolgov, G.B. Rudneva and V.N. Nesterova

Polar Research Institute of Marine Fisheries and Oceanography (PINRO) 6 Knipovich Street, 183763 Murmansk, Russia

*Correspondence to E. L. Orlova: tel: +7 8152 473424; fax: +7 1 78910518. e-mail: orlova{at}pinro.ru.

Using cod feeding data, this paper considers the distribution and abundance of macroplankton from different ecological groups (euphausiids and hyperiids) and the variability in their consumption by cod over a period of years during which different water mass temperatures were observed. These years were also characterized by variable abundance of capelin, cod's main food source. Differences in intensity and duration of cod consumption of euphausiids and hyperiids species are shown, depending on their abundance, temperature conditions, cod distribution, and the supply of capelin for cod. This paper discusses the energetics of consuming different types of prey and the role euphausiids play in the energy balance of cod. The low fat content of cod is sometimes associated with feeding on postspawning euphausiids in summer and autumn.

Keywords: Barents Sea, cod, euphausiids, feeding, hyperiids

Received 1 July 2004; accepted 4 August 2005.


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