Based on recent evaluations of the Wisconsin fish bioenergetics models in the laboratory, some scientists have concluded that the models for all fish species contain a systematic bias in that the models underestimate food consumption at relatively high feeding rates. These scientists attributed this systematic bias to an error associated with the egestion, excretion, or specific dynamic action submodels within the bioenergetics model. Further, these scientists advocated that a correction factor be used in applying the bioenergetics model to fish in the field. Other scientists have contended that this underestimation of food consumption is simply an artifact of fish being confined to a laboratory tank with very limited swimming activity while ingesting food at a high rate. Moreover, this underestimation of food consumption was attributable to an increase in resting metabolic rate, and this increase in resting metabolic rate would not occur if the fish were actively swimming. If this underestimation of food consumption was indeed due to increased resting metabolic rate brought about by limited swimming activity while confined in a laboratory tank, then this underestimation of food consumption would not be expected in the field, where fish would not be confined to such a small volume of water. Consequently, a correction factor would be unnecessary in applying the bioenergetics model to fish in the field. The primary objective of this study is to determine whether performance of fish bioenergetics models in the laboratory is influenced by the level of fish activity.
Effect of activity on bioenergetics model performance in the laboratory
Great Lakes Fishery Commission $ 9,900.00USDEstimates
Funding 54 projects for a total of $5,089,137.00
Scope of Study
Scale of Phenomena
Natural Ecological Processes