Two experiments were conducted in order to determine the optimum food density of Moina mongolica and to clarify M. mongolica have or not the phenomenon of compensatory growth. The test animals were two strains of Moina mongolica(Jinnan strain and Neimeng strain) in this study. Jinan strain of M. mongolica was collected from Lake Xiaochi in south of Shanxi Province in 1982; Neimeng strain of M. mongolica was collected from Lake Zhagesitai in Inner Mongolia in 2002. Laboratory-reared M. mongolica juveniles( a...