This study was conducted to evaluate the effects of the feeding rate (0%, 2.5%, 5.0%, 7.5%, and 10% of body weight per day; BW.d⁻¹) on growth performance, nutritional efficiency, and profitability of Nile tilapia (Oreochromis niloticus) juveniles (3.1 ± 0.1 g) using the biofloc technology (BFT) system for 70 days. Fish were randomly stocked (15 fish. Tank⁻¹) in 24 experimental units (50 L), while water quality parameters remained within acceptable limits for the species during the experiment. Animal performance parameters were influenced by feeding rates (P < 0.05), but not survival (P > 0.05), which remained around 81%. Final body weight, weight gain, and thermal growth coefficient increased significantly (P < 0.05); however, the gradual increase in feeding rates had reduced feed efficiency, protein, and energy productive values (P < 0.05). Whole-body lipid and gross energy increased significantly (P < 0.05) as the feeding rate increased, while the moisture content showed an opposite trend up to 5.0% BW.d⁻¹. The results show that Nile tilapia juveniles raised in the BFT system should be fed between 4.3 and 6.1% BW.d⁻¹ to exhibit improved profitability and growth.

进行这项研究以评估饲喂率（每天体重的0％，2.5％，5.0％，7.5％和10％； BW.d ^-1）对生长性能，营养效率和利润的影响。使用生物絮凝技术（BFT）系统的尼罗罗非鱼（Oreochromis niloticus）幼鱼（3.1±0.1 g）70天。在24个实验单位（50升）中随机放养鱼类（15条鱼，水箱^-1），而在实验期间水质参数保持在该物种可接受的范围内。动物的性能参数受饲喂率的影响（P  <0.05），但不受存活率的影响（P  > 0.05），后者保持在81％左右。最终体重，体重增加和热生长系数显着增加（P  <0.05）; 然而，摄食率的逐渐提高降低了饲料效率，蛋白质和能量生产价值（P  <0.05）。随着摄食率的增加，全身脂质和总能量显着增加（P <0.05），而水分含量却呈现相反的趋势，达到5.0％BW.d ^-1。结果表明，在BFT系统中饲养的尼罗罗非鱼幼鱼的BW.d ^-1应当介于4.3和6.1％之间，以表现出改善的获利能力和增长。