 In August, the stock of phytoplankton is dominated by cyanobacteria and green algae, of which several are potentially poisonous and caused major algae blooms during the 1990s.The community of zooplankton is representative for lakes rich in nutrients with medium-sized taxa dominating in late spring and June, while minor taxa are otherwise prevailing.Larger zooplankton, such as Cyclopoid Copepods, are rare and reaches about 40 per cent in July and August.