Notes on the current status of hydrobiology of continental water-bodies

The article deals with the main conceptions of production hydrobiology and the theory of biological productivity and some applications of these conceptions for the resolution of theoretical and practical tasks. Emphasis is placed on the necessity to develop a theory of the functioning of aquatic ecosystems and on the scanty knowledge of matter flows and particularly of information flows in ecosystems and on the necessity to gain knowledge of spatio-temporal relationships in ecosystems of different water-bodies. Such knowledge is needed for understanding the mechanisms of the functioning of aquatic ecosystems.