Details

Autor(en) / Beteiligte

• Zhao, H.
• Ma, H.‐J.
• Gao, S.‐N.
• Chen, X.‐R.
• Chen, Y.‐J.
• Zhao, P.‐F.
• Lin, S.‐M.

Titel

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

Ist Teil von

• Aquaculture nutrition, 2018-02, Vol.24 (1), p.625-632

Ort / Verlag

Oxford: Hindawi Limited

Erscheinungsjahr

2018

Quelle

Wiley Blackwell Single Titles

Beschreibungen/Notizen

• 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.