Abstract
1. 1. Metabolic-temperature curves show summer animals to have higher weight-specific oxygen consumptions at all acute temperatures. 2. 2. Metabolic-temperature curves of both species reveal the winter animals to be less dependent on temperature. 3. 3. Effect of experimental temperature was found to be statistically significant, but the metabolic-temperature curves of acclimated animals showed no consistent change with change in experimental temperature. 4. 4. Experimental temperature affects the seasonal response to salinity, shown by gill respiration rate, differently in the two species. 5. 5. Summer animals of both species show an increase in respiration rate as the osmotic gradient between blood and environment increases. Data obtained during the winter show little change. These data present indirect evidence which indicates that the gills are involved in regulating blood electrolytes. 6. 6. The regression coefficient of weight-specific oxygen consumption as a function of whole body weight was found to be similar in both species and to have a value of −0.169.
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