In non-limited nutrient experiments (basal medium + 100 µg Ptot. dm-3 and 2000 µg Ntot. dm-3) the highest production (growth rate, chlorophyll ɑ, dry weight) of Chlorella fusca and Ankistrodesmus falcatus grown in pure cultures was obtained. Similar enhancement of mixed cultures (1:1) was observed despite the production of each one being lower than its own in pure culture. C. fusca requires relatively higher amounts of nitrogen than A. falcatus. However, the uptake of phosphorus by C. fusca was lower than A. falcatus. On the other hand, C. fusca can inhibit the growth of A. falcatus, while A. falcatus somewhat improved the growth of C. fusca.