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

IF 1.4 4区 农林科学 Q3 FISHERIES North American Journal of Aquaculture Pub Date : 2024-09-05 DOI:10.1002/naaq.10352
Shilin Zhang, Huige Ren, Wenyi Wu, Luoxin Li, Yi Chai, Wei Liu
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Abstract

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.
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膳食生育三烯酚对大口鲈鱼幼鱼的生长、消化酶活性、抗氧化能力、组织学和抗病性的影响
方法将初始平均体重(±SD)为 0.98 ± 0.09 g 的大口鲈鱼幼鱼饲喂含有生育三烯酚的 0、10、20、30 和 40 mg/kg 五种日粮(分别为 T0、T10、T20、T30 和 T40 日粮)42 天。结果表明,添加生育三烯酚的日粮对幼鱼的存活率有积极影响。此外,摄入 T30 和 T40 日粮的鱼类的增重和特定生长率明显高于摄入 T0 日粮的鱼类。补充生育三烯酚可提高蛋白质效率比和体况系数,增加全身脂质和蛋白质含量。相反,添加生育三烯酚后,肝脏指数、粘液指数和饲料转化率明显下降。饲喂 T30 和 T40 日粮的鱼类的肝胰脏脂肪酶活性和肠道蛋白酶活性明显提高。一般来说,随着生育三烯酚含量的增加,肝脏中的超氧化物歧化酶和过氧化氢酶活性也会增加。此外,肝脏丙二醛浓度降低,肝细胞组织结构得到改善。与饲喂 T0 日粮的鱼类相比,饲喂 T30 和 T40 日粮的鱼类在受到 LMBV 挑战 48 小时后的存活率明显更高。结果表明,在大口鲈幼鱼日粮中添加适量的生育三烯酚可提高存活率、生长速度、抗氧化能力、消化能力、营养吸收能力和抗病能力。
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来源期刊
CiteScore
2.50
自引率
0.00%
发文量
46
审稿时长
18-36 weeks
期刊介绍: The North American Journal of Aquaculture publishes papers on new research and practical experience in all areas of intensive and extensive fish culture. Topics include broodstock selection and spawning, nutrition and feeding, health and water quality, facilities and production technology, and the management of ponds, pens, and raceways. The journal will consider papers dealing with ways to improve the husbandry of any aquatic species—marine or freshwater, vertebrate or invertebrate—raised for commercial, scientific, recreational, enhancement, or restoration purposes that may be of interest to practitioners in North America. Its scope includes both basic and applied science, but applied scientific endeavors—including practical experiences, descriptive studies, and other nontraditional, but pertinent works—are emphasized.
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