Abstract: In this experiment, the effects of low nitrogen feed with different dextrin content on the growth of carp（13.12±0.55）g and some physiological and biochemical indexes were studied. The additions of dextrin in the three groups（D1, D2 and D3）were 0%, 7.5% and 15.0%, respectively. After 56 days of breeding test, the growth and some physiological and biochemical indexes of carp were determined. The results showed that there was no significant difference in fish body weight gain rate, specific growth rate and fullnes（P>0.05）. The weight gain rate and specific growth rate of D1 were higher than those of the other two groups, with the average values of 357. 43% and 2.53%. The fatness of D3 reached the highest in the three groups, with an average value of 4.00%. The contents of total cholesterol, triglycerides and serum low-density lipoprotein cholesterol in D2 in serum were significantly lower than those in other treatment groups（P<0.05）. The density lipoprotein content was significantly higher than other treatment groups（P<0.05）, with an average value of 2.33 mmol/L. The serum SOD activity in D2 was significantly higher than D1（P<0.05）, and there was no significant difference with D3（P<0.05）. The SOD activity in liver and pancreas D3 was the highest and there was no significant difference with other groups（P>0.05）. D2 was the highest in serum CAT activity （P<0.05）, MDA activity was the lowest in serum and liver and pancreas（P<0.05）, AKP and LZM activity was the highest, and AKP activity was significantly different between D2 and D3（P<0.05）. It can be concluded from this test that the content of dextrin in the test feed has no significant effect on the growth of carp, and the feed containing 7.5% dextrin has improved the antioxidant capacity and immunity of carp.

Key words: Cyprinus carpio, dextrin, growth, physiological and biochemical indexes