Metabolic expenditure of waleye (Stizostedion vitreum vitreum) as determined by rate of oxgen consumption

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Abstract
Energy expended by walleye (S. v. vitreum) for metabolism was assessed by measuring O2 consumption of different size fish in respirometers under various conditions of temperature, activity and ration. Standard metabolism was estimated as rate of O2 consumption of unfed resting fish, and relationships to weight and temperature were expressed by simple and multiple regression equations. Although slopes for simple regressions did not differ significantly from slopes for analogous equations determined previously for walleye in maintenance feeding trials, the intercept or level of metabolism for a fish of unit weight at 20.degree. C computed from feeding experiments was more than 3 times > that computed by respirometry. Heat increment, which was quantified from the difference in O2 consumption of resting walleye fed and deprived of food at 20.degree. C, ranged from .apprx. 9-11% of the energy ingested and appeared independent of ration and fish size. Metabolism for swimming, determined as the difference between the rate of O2 consumption of unfed fish resting and swimming 1 body length/s, was calculated to be approximately equal to the energy expended by walleye for standard metabolism.

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