The present study conducted to evaluate the impact of dietary C: N: P ratios on Nile tilapia, growth induces in biofloc system and formation of water biotic communities. Five isonitrogenous, 30% crude protein and isocaloric 23.35 MJ/kg gross energy were formulated. Diets were equal but with variation of mono ammonium phosphate, NH₄H₂PO₄ levels to obtain different Carbon/Nitrogen/ Phosphorus (C/N/P) dietary ratios. The basal diet had no NH₄H₂PO₄ added (Co) and contain 12:1 N/P ratio. Diets 2–5 each contained NH₄H₂PO₄ at levels of 1.2 (NP₁₀), 3.3 (NP₈), 6.8 (NP₆) and 13.7 (NP₄) g/kg diet, respectively to provide 10:1, 8:1, 6:1 and 4:1 N/P ratios, respectively. Phytoplankton was collected every two weeks during 70 days using 10 L water samples that were sieved via a 10 µm mesh plankton net. The result revealed that the highest growth performance parameters, best nutrients utilization include FCR and PER values were recorded for Nile tilapia fed NP₁₀ diet compared to control treatment. The poorest FCR value was recorded for fish fed the NP₆ diet. The phytoplankton community increased with the increasing of dietary phosphate level associated with increasing N: P ratios. On the vice versa, zooplankton showed a remarkable decrease with the increase of phosphate concentrations. The density of aerobic plate count, total Diazotroph, spore forming Diazotroph and lactic acid bacteria increased as the N/P ratio increased to 8:1. The present findings revealed that the fish in the biofloc groups had the best performance and nutrients utilization than the basal diet. However, the positive impacts of BFT technology on growth and feed utilization efficiency of Nile tilapia have been stated.

本研究旨在评估日粮 C:N:P 比例对尼罗罗非鱼、生物絮团系统生长诱导和水生物群落形成的影响。配制了五种等氮、30% 粗蛋白和等热量 23.35 MJ/kg 总能量。日粮相同，但磷酸一铵、NH4H2PO4水平不同，以获得不同的碳/氮/磷（C/N/P）日粮比例。基础日粮没有添加NH 4 H 2 PO 4 （Co）并且含有12:1的N/P比。日粮 2-5 中的 NH4H2PO4 含量分别为 1.2 (NP ₁₀ )、3.3 (NP ₈ )、6.8 (NP ₆ ) 和 13.7 (NP ₄) g/kg 日粮，分别提供 10:1、8:1、6:1 和 4:1 的 N/P 比率。在 70 天内，每两周收集一次浮游植物，使用 10 L 水样，这些水样通过 10 µm 浮游生物网筛分。结果表明，与对照处理相比，饲喂 NP _{10日粮的尼罗罗非鱼记录了最高的生长性能参数、最佳养分利用率（包括 FCR 和 PER 值）。喂食 NP 6}的鱼的 FCR 值最差饮食。浮游植物群落随着日粮磷酸盐水平的增加而增加，这与 N:P 比的增加有关。反之亦然，浮游动物随磷酸盐浓度的增加而显着减少。好氧菌落数、总固氮菌、产孢固氮菌和乳酸菌的密度随着N/P比增加到8:1而增加。目前的研究结果表明，生物絮团组中的鱼比基础日粮具有最好的性能和营养利用。然而，BFT 技术对尼罗罗非鱼的生长和饲料利用效率的积极影响已经被阐明。