Abstract：The effects of ultraviolet radiation ( 0-150 mj﹒cm-2) on the growth, development and reproduction of Moina mongolica Daday were studied. Two experiments were conducted in laboratory. The results showed that M. mongolica had been injured seriously and its fecundity were decreased in high dosage of UV radiation (above 70 mj cm-2) e.g. pre-reproduction period , neonates number per brood and fecundity was 5.8d, 13 ind. brood-1 and 186 ind. respectively. And relate indicates were 5.4-5.6d, 23.9-33.1ind. brood-1 and 406.8-535.8 ind. respectively, in other treatments groups ( UV 60, 50 ,40 ,30 ,20,10 mj cm-2) and control group. The capability of growth or reproduction of M. mongolica , such as life fecundity and daily increase rate of body length could be stimulated by low dosage of UV radiation. E.g. above two indicates in treatment group were higher than those of control grops in experiments 1; the cumulative duration of development of adult instar of M. mongolica in treatment groups was less than that of control groups in experiment 2. The effects of UV radiation on the life of aquatic organisms and use prospect in mass culture of M. mongolica were discussed.
