The performance, efficiency of consumed feed, body chemical composition, survival rate, antioxidant and immunity parameters of Nile tilapia (Oreochromis niloticus) reared in probiotic-treated water were studied. Two hundred apparently healthy Nile tilapia (20 ± 0.3 g) juveniles were reared for 70 days in five different treatments, with five replications as the control group (clean water) and four test groups with two probiotics strains (Bacillus toyonensis and Geobacillus stearothermophilus) at two different levels (1 or 2 × 105 CFU ml⁻¹) applied in rearing water. Fish reared in water supplemented with G. stearothermophilus at low level demonstrated significantly enhanced (p < 0.05) growth performances in terms of final body weight (FBW), weight gain (WG), daily weight gain (DWG), specific growth rate (SGR), and relative growth rate (RGR) compared to the control group. In the same context, supplied fish rearing water a lower amount of G. stearothermophilus (GS1) remarkedly reduced feed conversion ratio values when compared to the control group. In contrary, all other feed efficiency parameters increased significantly when G. stearothermophilus (GS1) water was added at low amount in the compartment with the untreated group. Moreover, probiotic water additives significantly reduced the range and median levels of unionized ammonia (NH₃) in water when compared to the untreated group. According to the findings of the body chemical composition, treated tilapia water with a high level of B. toyonensis had significantly higher crude protein and fat levels, as well as lower ash levels, than the control group. When compared to the control group, probiotic-water supplementation significantly improved oxidative status and immunological activity at all bacterial dosage levels, with the fish group enriched with a high level of G. stearothermophilus recording the maximum values of both antioxidant and immune activity. Finally, results reveal that water treated with B. toyonensis or G. stearothermophilus as a probiotic promoted Nile tilapia growth and health status, and this technology may be applied to stimulate tilapia productivity in culture farms.

研究了在益生菌处理过的水中饲养的尼罗罗非鱼（ Oreochromis niloticus ）的性能、采食效率、身体化学成分、成活率、抗氧化和免疫参数。将 200 条明显健康的尼罗罗非鱼 (20 ± 0.3 g) 幼鱼在 5 次不同的处理中饲养 70 天，其中 5 次重复作为对照组（清洁水）和 4 个试验组，其中含有两种益生菌菌株（丰盈芽孢杆菌和嗜热脂肪地芽孢杆菌）两种不同水平（1 或 2 × 105 CFU ml ^-1）应用于饲养水中。在添加了G. stearothermophilus的水中饲养的鱼在最终体重 (FBW)、体重增加 (WG)、日增重 (DWG)、比生长率 (SGR) 和相对生长率 (RGR) 方面，在低水平下表现出显着增强 (p < 0.05) 的生长性能与对照组相比。在同样的情况下，与对照组相比，提供较少量的G. stearothermophilus (GS1)的养鱼用水显着降低了饲料转化率值。相反，当在未处理组的隔间中以少量添加G. stearothermophilus (GS1) 水时，所有其他饲料效率参数均显着增加。此外，益生菌水添加剂显着降低了非离子氨（NH ₃) 与未处理组相比，在水中。根据身体化学成分的研究结果，与对照组相比，含有高水平B. toyonensis的处理过的罗非鱼水具有显着更高的粗蛋白和脂肪水平，以及更低的灰分水平。与对照组相比，益生菌-水补充显着改善了所有细菌剂量水平的氧化状态和免疫活性，富含高水平G. stearothermophilus的鱼组记录了抗氧化和免疫活性的最大值。最后，结果表明用B. toyonensis或G. stearothermophilus处理的水作为一种促进尼罗罗非鱼生长和健康状况的益生菌，该技术可用于刺激养殖场的罗非鱼生产力。