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Effects of the aqueous extract of astragalus root Astragalus membranaceus on immunity and antioxidation in Amur sturgeon (Acipenser schrencki Brandt)

LIU Hong-bai~(1,2), LU Tong-yan~(2), ZHANG Chun-yan~(3), SUN Da-jiang~(2),BAI Xiu-juan~1 (1.Northeast Agriculture University,Harbin 150030,China;2.Heilongjiang River Fisheries Research Institute,Chinese Academy of Fishery Sciences,Harbin 150070,China;3.Heilongjiang Traditional Chinese Medical University,Harbin 150030,China)  
Effects of aqueous extract of radix Astragalus membranaceus Fisch on immunity and antioxidation of 1 year old Amur sturgeon(Acipenser schrencki Brandt) were studied by oral perfusion.The sturgeon were orally perfused aqueous extracts from Astragalus root at a rate of 0.5%(Group A),1.0%(Group B)and 2.0%(Group C) of diet and distilled water at a rate of 0.3 mL/100 g body weight(Group D) once a day,respectively.The results showed that lysozyme level in plasma and different tissues increased in Group A and Group B,and changed in Group C,but statistically there were no significant.There were no significant differences in nitrogen monoxide(NO) and nitrogen monoxide synthetase(NOS) levels in plasma in all groups.In hepatopancrease in Group B and Group C,however,NO levels were significantly higher than that in Group D.NOS level in hepatopancrease was significantly higher than that in Group D.The fish in Group B had higher superoxide dismutase(SOD) than that in Group D.
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