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ICES Journal of Marine Science: Journal du Conseil Advance Access published online on September 23, 2009
ICES Journal of Marine Science: Journal du Conseil, doi:10.1093/icesjms/fsp230
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© 2009 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Density-dependent distribution of Atlantic cod (Gadus morhua) into deep waters on the Faroe Plateau

Petur Steingrund and Lise H. Ofstad

Faroe Marine Research Institute, Nóatún, PO Box 3051, FO-110 Tórshavn, Faroe Islands

Correspondence to P. Steingrund: tel: +298 35 39 00; fax: +298 35 39 01; e-mail: peturs{at}hav.fo.

Steingrund, P., and Ofstad, L. H. 2010. Density-dependent distribution of Atlantic cod (Gadus morhua) into deep waters on the Faroe Plateau. – ICES Journal of Marine Science, 67: 000–000.

The natural production of cod on the Faroe Plateau depends on the spatial overlap between cod and their prey. However, cod tend to be distributed shallower than the bulk of their prey fish, such as Norway pout and blue whiting. We used commercial and survey catch per unit effort (cpue) data to investigate the distribution of cod in the deep water (150–400 m) on the Faroe Plateau. Cod often move to deep water when they are 4 or 5 years old. The extent of this habitat shift was positively correlated with the total biomass of 3- or 4-year-old cod on the Faroe Plateau, whereas prey densities in the shallow and deep areas, respectively, seemed to have much less influence. Hence, year classes that were a year older than strong year classes were distributed deeper than normal, and vice versa. The cpue in deep water for all ages pooled was strongly correlated with the age 3–6 biomass of cod on the entire Faroe Plateau. These findings are discussed in relation to food utilization and management.

Keywords: catchability, density-dependence, Faroe Plateau, food availability, Gadus morhua

Received 24 February 2009; accepted 30 July 2009.


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