Graduate Thesis Or Dissertation
 

The relationship between body size and metabolism in Lepomis macrochirus Rafinesque

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  • Weight-specific oxygen consumption of intact bluegill sunfish was estimated in relation to body weight and temperature by the sealed jar method. The relationship between body weight and weight-specific oxygen consumption was represented by the equation: Y = aX[superscript b]⁻¹ in which Y is the weight-specific oxygen consumption, expressed as cc/kg/hr, X the body weight, and a and b-1 are constants indicating the intercept and slope, respectively, of the curve of log metabolism versus log body weight. The mean slope of the regressions was found to be -0.3800 at ten degrees C. and -0.4285 at 20 degrees C. Tissue QO₂'s for gill, liver and muscle in relation to body weight were determined at ten and 20 degrees C. The regression coefficients for gill, liver and muscle at ten degrees were -0.0852, -0.1505 and -0.3116, and at 20 degrees -0.0799, -0.2070 and 0.1247. Muscle tissue at 20 degrees C. thus showed an increase in QO₂ with increasing body size. At ten degrees muscle showed metabolic over- compensation. Metabolic compensation to low temperature was not seen in gill, liver, or the intact animal.
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