Seasonal and sex-bound variation in the carbohydrate metabolism of the liver of the whitefish

摘要: Abstract Seasonal variations in the weight of liver, its glycogen content and two carbohydrate enzyme activity values were studied specimens Coregonus nasus (Pallas), sensu Svardson. 1. The results obtained for virgin fish maturing or spent males revealed similar patterns variation, though figures generally somewhat higher. 2. group spawn, measured October, stood out by virtue high liver recorded. 3. Compared with other groups, mature females had larger livers from July (the onset rapid gonadal development) to January, lower during winter, G6Pase September-November phosphorylase August until spring. 4. main reasons these sexual differences are thought be vitellogenetic role an estrogen-induced inhibition metabolism. 5. observed November winter months, increased size found increase midwinter all associated seasonal acclimatization. took place autumn. 6. On one occasion very low activities found, together rapidly increasing liver. 7. In general, decreased considerably spring while sea was still frozen over, this decrease completed between taking May June samples. phenomenon accompanied activity, especially fish.