Short-Term Starvation Changes the Sensitivity of Intestinal Glycosidases of Juvenile Common Carp Cyprinus carpio L. to an Increase in the Water Temperature

Abstract

The activity of glycosidases (maltase activity and amylolytic activity) in the intestinal mucosa of juvenile common carp Cyprinus carpio (L.) under a sharp increase in water temperature depends on its physiological state (satiety or starvation). The fish are acclimated to a temperature of 22°С during the summer (young-of-the-year) and winter (yearling) seasons. An increase in water temperature at a rate of 8.0°C/h leads to an increase in amylolytic activity in well-nourished fish, but the maltase activity does not change. Starving for 3 or 10 days changes the response of glycosidase to temperature stress: the maltase activity increases, but amylolytic activity does not change. Short-term starvation does not affect the thermal tolerance of juvenile common carp; i.e., the values of the critical thermal maximum in hungry and well-nourished specimens do not differ.