Comparative activities of glycogen phosphorylase and gamma-amylase in livers of carp (Cyprinus carpio) and goldfish (Carassius auratus).

1. The activity of glycogen phosphorylase in goldfish liver is fivefold greater than that in carp liver, suggesting that the enzyme may not be as important in regulating glycogenolysis in the latter species. 2. The activity of gamma-amylase is comparable in carp and goldfish liver. 3. The activity of hepatic gamma-amylase is approximately one-half that of glycogen phosphorylase in carp whereas in goldfish, the activity of gamma-amylase is less than one-sixth that of phosphorylase. Hepatic gamma-amylase may be an important glycogenolytic enzyme in carp but makes an insignificant contribution to glycogenolysis in goldfish.