Abstract:Rotifer in 18 reservoirs of Guangdong Province, South China were investigated in the year 2000. The effect of retention time on rotifer distribution was also analyzed in three reservoirs: Feilaixia Reservoir, Liuxihe Reservoir and Xinfengjiang Reservoir with different retention time from 2001 to 2003. 101 species belonging to 36 genera of 20 families were identified. The majority of the species were monogononts, while bdelloids were represented only by Rotaria sp.. The largest fraction belonged to the follo...