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Effect of Compound Chinese Herb Medicine on Resistance to White Spot Syndrome Infection in Red Swamp Crayfish Procambarus clarkii |
TIAN Haijun1, REN Shengjie2, YANG Zhiguo1, GU Xizhang3 |
1. Fisheries College of Xinyang Agriculture and Forestry University, Xinyang 464000, China; 2. College of Marine and Biological Engineering, Yancheng Institute of Technology, Yancheng 224051, China; 3. Sheyang Liuhe Feed Co., Ltd., Yancheng 224300, China |
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Abstract In order to evaluate the non-specific immunity, antioxidant capacity and anti-white spot syndrome virus (WSSV) infection effect of supplementation with compound Chinese herb medicine prepared byrhubarb root and rhizome, baical skullcap root, virgate wormwood herb, creeping euphorbia, largehead atractylodes rhizome, and isatis rootin red swamp crayfish Procambarus clarkiiin diet, juvenile red swamp crayfish with body weight of (8.94±1.16)g was reared in a 2 m×3 m×1 m aerated pond at stocking rate of 120 individuals per pond and fed the basic diet (control group) and supplemented with the compound Chinese herb medicine at a dose of 0.5%, 1.0%, 1.5% and 2.0% for 14 d. Then the non-specific immunity of hemolymph and the antioxidant capacity of hepatopancreas were determined, and the anti-infection ability of the red swamp crayfish against WSSV infection was analyzed. The results showed that the activities of lysozyme, phenol oxidase (PO), acid phosphatase (ACP) and alkaline phosphatase (AKP) in the serum of the red swamp crayfish fed the compound Chinese herb medicine were found to be increased by 4.07%-16.20% (P<0.05), 12.96%-31.94% (P<0.05), 32.36%-39.87% (P<0.05) and 36.50%-71.94% (P<0.05). The total superoxide dismutase (T-SOD), catalase (CAT) and total antioxidant capacity (T-AOC)in hepatopancreas were increased by 4.39%-25.76% (P<0.05), 32.85%-93.43% (P<0.05) and 21.52%-55.10% (P<0.05), and the malondialdehyde content in hepatopancreas was decreased by 26.22%-45.05% (P<0.05). The red swamp crayfish treated with compound Chinese herb medicine and then challenged with WSSV had increase insurvival rate by 13.33%-31.67% during the 5 d (P<0.05).The findings indicated that the addition of dietary compound Chinese herb medicine significantly enhanced the non-specific immunity, antioxidant capacity and resistance to WSSV infection in red swamp crayfish, with optimal dose of 1.0%.
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Received: 15 May 2022
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