Size,age and diet of polar cod,Boreogadus saida (Lepechin 1773), in ice covered waters |
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Authors: | O. J. Lønne B. Gulliksen |
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Affiliation: | (1) Department of Marine Biology, Tromsø Museum, University of Tromsø, P.O. Box 2550, N-9001 Tromsø, Norway |
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Abstract: | Summary Polar cod (Boreogadus saida) associated with drifting sea-ice were collected in the western Barents sea and north of Svalbard with dip-nets while SCUBA-diving in 1986 and 1987. Length-frequency measurements and otolith-readings suggested that the specimens were either one or two years old. The diet of fish from the western Barents sea (first-year ice) consisted mainly of copepods (Calanus finmarchicus, Calanus glacialis) and the hyperiid amphipod Parathemisto libellula. Fish collected north of the Svalbard archipelago (multi-year ice) had a more diverse diet, in which P. libellula and the sympagic amphipod Apherusa glacialis contributed more to the total diet biomass than copepods. |
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