In this study, three species of crustacean zooplankton i.e. Daphnids(Daphnia carinata), Cyclopoida(Eucyclops serrulatus), and Ostracods(Dolerocypris sinensis) were selected to investigate their interspecific relationship between each of them with Rotifers(Brachionus calyciflorus). Each species of Crustacean zooplankton was cultured at seven initial densities with Rotifers at density of 350 ind/L. The principal response curve(PRC) and multiple comparisons were employed to indicate the effects of crustacean z...