LI Rong-ni, TANG Rui-bo, ZHANG Xin*, WANG Sai-sai, ZHU Li-fei, SHI Dong-jie, SUN Yan-sheng
Key Laboratory of Urban Agriculture (North China), Ministry of Agriculture and Rural Affairs, Beijing Fisheries Research Institute, Beijing 100068, China
Abstract: A total of 336 individuals of common carp Cyprinuscarpio with an initial body weight of (73.66±0.21)g were randomly divided into 8 groups with 3 replicates per group, 14 fish per replicates, reared in an indoor tank of 100 cm×50 cm×50 cm and fed basal diet(control group A), and the basal diets supplemented with sun-dried vermicompost, whose nutritional level and safety were evaluated, at a rate of 2.5%(group B1), 5.0%(group B2), and 7.5%(group B3), and with high-temperature dried vermicompost at a rate of 5.0%(group C1), and 7.5%(group C2), and with mixture of sun-dried vermicompost and earthworm powder at a ratio of 5.0%+0.15%(group D1), and 7.5%+0.23%(group D2) at water temperature of 27-29 ℃ for 60 d. The growth performance digestive enzyme activity and antioxidant indices in serum and hepatopancreas ofcommon carp were determined at the end of the experiment. The results showed that the contents of heavy metals in the common carp fed the diets containing vermicompost were well under the level of hygienical standard for feeds, and the different levels of additional vermicompost showed certain effects on the weight gain rate, specific growth rate, serum and antioxidative indices in serum and hepatopancreas, significant differences in superoxid dismutase activity between the treatment groups and the control group(P<0.05) except for B1 group. There was no significant difference in food conversion ratio and activities of intestinal digestive enzymes among the fish fed the diets containing different levels of vermicompost (P>0.05). The findings provided theoretical reference and data for reasonable application and development of vermicompost as feed additives in aquaculture.
2019, Vol. 34 
