饲料的能量蛋白比（P／E）是衡量饲料质量的一个重要指标，这是因为不适宜的能量含量会使蛋白质成为一种能源，用于产生能量的蛋白质越多，鱼体排泄的氨就越多，体内保留的氮越少，蛋白质效率（PER）就越低，从而造成蛋白质的浪费。然而，当饲料中的蛋白质含量适宜而能量水平过 Feed energy protein ratio (P / E) is a measure of feed quality is an important indicator, because the inappropriate energy content makes the protein into an energy source, the more protein used to generate energy, the fish excreted ammonia The more nitrogen is retained in the body, the lower the protein efficiency (PER) is, resulting in a waste of protein. However, when the protein content in the feed is appropriate and the energy level is too high