ABSTRACT
The phytoplankton of Lake Donghu was compared between two periods (i.e., 1982–83 and 1999–2001). During 1982–1983, Lake Donghu was characterized by cyanobacterial blooms, very high summer phytoplankton biomass, and a spring clear-water phase. However, during 1999–2001, the lake was dominated by dinophytes and diatoms and had a relatively low phytoplankton biomass and a very turbid state. Increased stocking of silver carp and bighead carp during the interim years eliminated cyanobacterial blooms and large-bodied daphnids from the lake, creating favorable conditions for growth of the small-sized algae.