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The effects of food consumption rate, body size and temperature on net food conversion efficiency in saithe and whiting

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Net food conversion efficiency κ was estimated from growth experiments on saithe Pollachius virens and whiting Merlangius merlangus that were fed natural prey at a range of ration levels including satiation rations. The conversion efficiency, which specifies the net energy fraction of ingested energy C, was described appropriately by a simple power function of food consumption rate as κ = 0·272C 0·18 and κ = 0·426C 0·11 for saithe and whiting. This functional relationship was supported by the patterns of accretion of lipids and proteins in saithe. No significant effects of temperature and body size on κ was, however, demonstrated in this study except for the indirect influence using feeding levels (rations expressed relatively to satiation rations) in bioenergetics models.

Keywords: Merlangius merlangus; Pollachius virens; bioenergetics; gadoids; maximum food consumption; net conversion efficiency

Document Type: Research Article


Affiliations: Danish Institute for Fisheries Research, Department of Marine Ecology and Aquaculture, North Sea Centre, P. O. Box 101, DK-9850 Hirtshals, Denmark

Publication date: 2003-02-01

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