一、背景 虹鳟是典型的肉食性鱼类,对饲料中的蛋白质和氨基酸要求较高。在虹鳟的常规颗粒日粮中含有40～50％的蛋白质,这些蛋白质主要来源于鱼粉。鱼粉价格较高,来源渠道狭窄。使用植物蛋白饲料代替虹鳟日粮中的鱼粉,日益受到水产养殖界的关注。但是,与鱼粉比较,植物蛋白饲料除了蛋白质含量低外,限制因素还有缺乏必需氨基酸、碳水化合物消化率低等存在多种抗营养因子。最近的一些研究表明,用乙醇沥滤法加工的 First, the background Rainbow trout is a typical carnivorous fish feed protein and amino acids higher. In rainbow trout conventional grain diets contain 40 to 50% of the protein, these proteins are mainly derived from fishmeal. Fishmeal prices higher, the source of narrow channels. The use of plant protein feed instead of fish meal in rainbow trout diets has drawn increasing attention from the aquaculture community. However, compared with fishmeal, plant protein feed in addition to low protein content, the limiting factor there is a lack of essential amino acids, low carbohydrate digestibility there are many anti-nutritional factors. Some recent studies have shown that ethanol leaching process