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Evaluation of dietary vitamin E supplementation on growth performance and antioxidant status in hybrid snakehead (Channa argus × Channa maculata)

Zhao, H., Ma, H.‐J., Gao, S.‐N., Chen, X.‐R., Chen, Y.‐J., Zhao, P.‐F., Lin, S.‐M.
Aquaculture nutrition 2018 v.24 no.1 pp. 625-632
Channa argus, alanine transaminase, alkaline phosphatase, antioxidants, aspartate transaminase, blood serum, catalase, experimental diets, feed conversion, feed intake, fish, globulins, glutathione peroxidase, growth performance, hybrids, immune response, juveniles, liver, malondialdehyde, protein efficiency ratio, serum albumin, specific growth rate, superoxide dismutase, vitamin E
An 8‐week feeding trial was conducted to investigate the effects of dietary vitamin E on growth performance and antioxidant status of juvenile snakehead. The snakeheads (20.47 ± 0.06 g) were fed with five isonitrogenous and isoenergetic experimental diets that contained 13 (the basal diet), 52, 79, 168 and 326 mg of vitamin E kg⁻¹, respectively. The maximum specific growth rate (SGR) and feed intake (FI) were achieved in fish fed on a diet with 79 mg kg⁻¹ vitamin E (p < .05). No significant differences were found in protein efficiency ratio (PER), feed conversion ratio (FCR) and survival of fish among all groups (p > .05). Vitamin E supplementation improved hepatic glutathione peroxidase (GPx) activity significantly. A consistent decline in the hepatic and serum malondialdehyde (MDA) content was observed in fish fed diets with the increased supplementation of vitamin E (p < .05). In addition, with the increasing level of vitamin E, serum alanine aminotransferase (ALT) and aspartate aminotransferase (AST) were reduced (p < .05). However, serum superoxide dismutase (SOD), catalase (CAT) and alkaline phosphatase (ALP) activities were enhanced in fish fed 79 mg vitamin E kg⁻¹ diet and then decreased significantly as the content of vitamin E in the diet increased (p < .05). Meanwhile, serum albumin (ALB) and globulin (GLB) were not affected by the supplemental levels of dietary vitamin E (p > .05). The vitamin E concentrations in liver and serum increased significantly with increasing dietary vitamin E (p < .05). Based on the broken‐line regression of SGR, vitamin E level in the diet is estimated to be 80.5 mg kg⁻¹ for Channa argus × Channa maculata. In conclusion, this study indicated that the dietary appropriate vitamin E could enhance the growth performance, antioxidant status and non‐specific immune response.