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

摘要: Energy expended by walleye (Stizostedion vitreum vitreum) for metabolism was assessed by measuring oxygen consumption of different size fish in respirometers under various conditions of temperature, activity, and ration. Standard metabolism was estimated as rate of oxygen 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 °C computed from feeding experiments was over three times greater than that computed by respirometry. Heat increment, which was quantified from the difference in oxygen consumption of resting walleye fed and deprived of food at 20 °C, ranged from about 9 to 11% of the energy ingested and appeared independent of ration and fish size. Metabolism for swimming determined as the difference between rate of oxygen consumption of unfed fish resting and swimming one body length per second was calculated to be approximately equal to the energy expended by walleye for standard metabolism.