Effects of dietary tocotrienol on growth, digestive enzyme activities, antioxidant capacity, histology, and disease resistance of Largemouth Bass fingerlings

文献类型： 外文期刊

第一作者： Zhang, Shilin

作者： Zhang, Shilin;Chai, Yi;Zhang, Shilin;Li, Luoxin;Liu, Wei;Ren, Huige;Wu, Wenyi

作者机构：

关键词： antioxidant; fingerlings; growth; histology; resistance; tocotrienol

期刊名称：NORTH AMERICAN JOURNAL OF AQUACULTURE （ 影响因子：1.3； 五年影响因子：1.5 ）

ISSN： 1522-2055

年卷期： 2024 年 86 卷 4 期

页码：

收录情况： SCI

摘要： ObjectiveWe sought to assess the efficacy of feeding tocotrienol, a member of the vitamin E family, as it impacts physiological functions in fingerling fish.MethodsFingerling Largemouth Bass Micropterus nigricans with an initial mean body weight (+/- SD) of 0.98 +/- 0.09 g were fed five diets containing tocotrienol at 0, 10, 20, 30, and 40 mg/kg (T0, T10, T20, T30, and T40 diets, respectively) for 42 days. After the feeding experiment, fish were challenged with Largemouth Bass ranavirus (LMBV) and monitored for 48 h.ResultFindings indicated a positive impact of tocotrienol-supplemented diets on fingerling survival. Furthermore, the weight gain and specific growth rate of fish that received the T30 and T40 diets were significantly higher than those of fish that were fed the T0 diet. Tocotrienol supplementation improved the protein efficiency ratio and condition factor and increased the whole-body lipid and protein content. Conversely, the hepatosomatic index, viscerosomatic index, and feed conversion ratio were significantly decreased by tocotrienol supplementation. Fish that were fed the T30 and T40 diets exhibited significantly higher hepatopancreas lipase activity and intestinal protease activity. Generally, superoxide dismutase and catalase activities in the liver increased as the tocotrienol level increased. Additionally, the liver malondialdehyde concentration decreased, and there was an improvement in the structure of liver cell tissue. Survival at 48 h after the LMBV challenge was significantly higher in fish that were fed the T30 and T40 diets compared to fish that were given the T0 diet. Maximum specific growth rate was observed at a tocotrienol concentration of 33.63 mg/kg.ConclusionResults suggest that supplementation of Largemouth Bass fingerling diets with appropriate quantities of tocotrienol can enhance survival, growth, antioxidant capacity, digestion, and uptake of nutrients as well as disease resistance. Impact statement The survival and growth performance of Largemouth Bass fingerlings were improved by adding tocotrienol at a concentration of 33.63 mg/kg in the diet.

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