In order to research the effects of anthraquinones extracte from Rheum officinale Baill on prevention of high temperature of Macrobrachium rosenbergii

Macrobrachium rosenbergii were divided into five groups randomly. The controls were fed with basal diet

the treated groups were fed with basal diet supplemented with 0.05%

0.10%

0.200%

0.40% anthraquinones extracte for 8 weeks

respectively. After that

shrimp were stressed by high temperature at 35 ℃ for 48 hours continuously. Then the growth and the changes of nitrogen oxide

lysozyme

glucose

triglyceride and cholesterol and in haemolymph before and after the stress were investigated. The results showed that 0.10% dose group significantly increased weight gains and reduced feed conversion rate

and 0.40% dose group significantly increased haemolymph lysozymes contents before the stress. After the stress

0.10% and 0.20% dose groups were relatively higher in haemolymph lysozymes and nitrogen oxides contents than those of the control. Stress also caused mortality in all groups of which 0.10%~0.20% dose groups were less than 30%

but the control was about 60%. It is concluded that ingestion of 0.10%~0.20% dose of anthraquinones extracte could help prevent negative effects of stress and improve shrimp growth.