Biology of Greenland cod,Gadus ogac,at Saqvaqjuac,northwest coast of Hudson Bay |
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Authors: | Mansour Y. Mikhail Harold E. Welch |
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Affiliation: | (1) Department of Fisheries and Oceans, Freshwater Institute, 501 University Crescent, Winnipeg, Manitoba, R3T 2N6, Canada;(2) Present address: C.A.R.E. Centre, 2338 Hurontario Str., Mississauga, Ontario, L5B 1N1, Canada |
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Abstract: | Synopsis The distribution and relative abundance, life history parameters, food habits, and metabolic rate were determined forGadus ogac in Sagvagjuac Inlet, northwest coast of Hudson Bay (63° N). Fish were demersal, non-schooling, and distributed evenly down to 35 m depth. Growth was slow (maximum age 12 y) and mortality relatively low (0.5 y–1).G. ogac first spawned at 2–3 y and spawned annually thereafter, in late March – early April. They tended to remain in the inlet and were not taken on the open coast. They are top carnivores, taking primarily capelin when available, benthic crustacea (crabs, amphipods) when not. The metabolic rate ofG. ogac is intermediate between the elevated rate of Arctic cod,Boreogadus saida, and eurythermal temperate species. Available data indicate they are not important in marine mammal and bird food webs. Their biology is contrasted with that of Arctic cod, which are short-lived, cryopelagic, feed on pelagic crustacea, and are an extremely important component of Arctic marine food webs.Direct reprint requests |
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Keywords: | Food habits Distribution Abundance Respiration Arctic Growth Age Spawning Marine fish |
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