关键词: 中草药制剂； 大口黑鲈； 生长性能； 抗氧化能力； 肝脏组织结构

Abstract: This experiment was conducted to evaluate the effects of Chinese herbal preparations on growthperformance，serum antioxidant capacity and liver health of largemouth bass. A total of 840 juvenile fish with an average initial weight of about 4.40 g were randomly divided into 6 groups with 4 replicates per group and 35 fish per replicate. The basic diet was supplemented with 0，0.05%，0.1%，0.2%，0.4% Chinese herbal extracts and 0.4% fermented Chinese herbal，respectively. Six isonitrogenous and isoenergetic experimental diets were recorded as G0， G0.05，G0.1，G0.2，G0.4 and GF0.4，respectively. The experiment was lasted 51 days. The results showed，there were no significant differences in average weight，weight gain rate，specific growth rate，survival rate and feed intake of largemouth bass among all groups（P>0.05）. Compared with G0 group，the VSI and HSI in G0.05 group and HSI in GF0.4 group were the lowest，but the differences were not significant（P>0.05）. The activities of AST and ALT in G0.1 group，the activities of GPX，SOD and CAT in G0.05 group were significantly increased（P<0.05），while the MDA content in G0.1 and GF0.4 was significantly decreased（P<0.05）. The liver tissue sections showed that the cytoplasm of G0 group was loose and lightly stained，and a few lymphocytes were focal infiltration，while G0.05，G0.1 and G0.2 groups only occasionally showed small focal lymphocytes infiltration. G0.4 group showed more watery degeneration of hepatocytes，loose cytoplasm and light staining，and a small amount of lymphocyte infiltration. No obvious abnormality was observed in GF0.4 group. In conclusion，supplementation of Chinese herbal extract and fermented Chinese herbal in low fish meal diet has no significant effect on the growth performance of largemouth bass， but supplementation of 0.05% Chinese herbal extract and 0.4% fermented Chinese herbal can improve the antioxidant capacity and liver tissue health of largemouth bass which fed low fish meal diet.

Key words: Chinese herbal； Largemouth bass； Growth performance； Antioxidant capacity； Liver tissue structure