We tested the hypothesis that the fate of dietary phosphorus will not differ among a dicalcium phosphate-free practical diet treated with 6-phytase (3000 FTU/kg; Quantum Blue™; P-F + Phy), and positive (C) and negative (P-F) control practical diets when fed to hybrid tilapia (Oreochromis aureus x O. niloticus; 29.8 g initial weight) stocked at 29 fish/m³ and grown for 5 months to market size (454 g/fish) in outdoor biofloc production system tanks (16.6 m³). The ideal protein diets were formulated to contain 27.7% digestible protein and 4% lipid from practical ingredients and were extruded commercially. Final weights (467–494 g), weight gains (1636-1723%), and average daily intake (2.10–2.18%) did not differ for fish fed the P-F + Phy or C diets; however, these metrics were significantly lower in the P-F diet treatment. There were fewer market size fish (46.8–54.7%), feed conversion ratios were poorer (1.59–1.61), and intraperitoneal fat contents (6.96–7.40%) were higher for fish fed the phosphorus-free diets compared to the C diet (65.3%, 1.46, 5.90%). Geosmin, as compared to 2-methylisoborneol, was considered the more relevant off-flavor compound and fillet concentrations were higher than those for 2-methylisoborneol, but concentrations present of each compound were unlikely to cause “earthy” or “musty” off-flavors. Accumulation rates of soluble reactive phosphorus, organic phosphorus, and total phosphorus in tanks fed the phosphorus-free were diets nearly half those observed for the C diet while phosphorus loading from feed was 37.7% lower.

我们测试了以下假设：在经过6植酸酶（3000 FTU / kg; Quantum Blue™; PF + Phy），阳性（C）和阴性（PF）处理的无磷酸氢钙的实际饮食中，饮食中磷的命运不会有差异）以杂交鱼罗非鱼（Oreochromis aureus x O.niloticus ; 29.8 g初始重量）喂养时控制实际日粮，以29鱼/ m ^3的比例放养，并在室外生物絮体生产系统罐中生长5个月至市场规模（454 g /鱼）（ 16.6米³）。理想的蛋白质日粮应配制为含有27.7％的可消化蛋白质和4％来自实用成分的脂质，并进行商业挤出。饲喂PF + Phy或C饲料的鱼的最终体重（467–494 g），体重增加（1636-1723％）和平均每日摄入量（2.10–2.18％）没有差异。但是，这些指标在PF饮食治疗中显着降低。与C日粮相比，无磷日粮鱼的市场规模鱼较少（46.8–54.7％），饲料转化率较差（1.59–1.61），腹膜内脂肪含量（6.96-7.40％）高。 65.3％，1.46、5.90％）。与2-甲基异冰片醇相比，Geosmin被认为是最相关的异味化合物，且鱼片浓度高于2-甲基异冰片醇，但是每种化合物的浓度均不太可能引起“土味”或“发霉”味。饲喂无磷日粮的罐中可溶性反应性磷，有机磷和总磷的累积速率几乎是C日粮的一半，而饲料中的磷负荷降低了37.7％。