Diet selenium improves the antioxidant defense system of juveniles Nile tilapia ( Oreochromis niloticus L.)

Abstract From the advancement of tilapia production in recent years, diets are sought that allow the maximum growth, improving health and fish quality. In this study growth, biochemical, hematological and oxidative parameters were evaluated of tilapia fed with increasing selenium levels: 0.53, 0.86, 1.04 and 1.22 mg kg-1. It was used 400 juveniles (initial weight = 36.51 ± 10.88 g), fed for six weeks. There was no effect of selenium on fish growth, biochemical and hematological parameters. In the oxidative parameters, there was an increase in non-protein thiols and a decrease in malondialdehyde levels, evidencing antioxidant effects of selenium. The diet selenium levels above 0.86 mg kg-1 improved the antioxidant system and does not affect to biochemical, hematological and growth parameters of tilapia juveniles.

摘要 近年来随着罗非鱼养殖产业的发展，科研人员致力于研发可实现鱼类最大生长性能、同时改善其健康状况与鱼肉品质的配合饲料。本试验选取0.53、0.86、1.04、1.22 mg·kg⁻¹四个梯度的硒添加水平配制饲料，投喂400尾初始体重为36.51±10.88 g的罗非鱼幼鱼，试验周期为6周，并对其生长、生化、血液学及氧化相关参数进行检测评估。结果显示，硒添加水平对罗非鱼的生长性能、生化指标及血液学参数均无显著影响；而在氧化相关参数方面，试验组罗非鱼的非蛋白巯基含量显著升高，丙二醛水平显著降低，证实了硒的抗氧化功效。当日粮硒添加水平高于0.86 mg·kg⁻¹时，可有效改善罗非鱼幼鱼的抗氧化系统，且不会对其生化指标、血液学参数及生长性能产生负面影响。