2. Material and Methods
Algal monocultures. Monocultures of two common in Lithuanian lakes algae species, Chlorella sp. and Scenedesmus sp., were cultivated in BG11 medium (Stainier R. Y. et al. 1971) in the laboratory from 29 to 50 days with different inorganic nitrogen,carbon dioxide and salinity sources and concentrations. Algal strains were cultivated in the temperature controlled condition at 28 oC under illumination of white fluorescent lamps for approximately 8 hours daily. The cultures were hand
shaken once or twice a day to avoid sticking.