Between July 20. and August 18. 1976, daily observations were carried out on the number and biomass of the phytoplankton of Lake Balaton, separately for micro- and macroalgae; in addition, organic carbon content, temperature and transparence of teh water were measured. Comparable investigations on the Lake Balaton have not been made so far.
The dynamics of certain determined variables reflect the character of a large, extensive and shallow lake. The data presented here draw attention to the difference between the thirty day variations of macro- and microalgae, and point ti the differences between information content, along with some other data, indicates the advanced state of eutrophication of the lake
