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虹鳟是世界名贵冷水性鱼类，在我国已有４０多年的养殖历史。随着虹鳟养殖技术研究的不断深入，虹蹲饲料配制也不断得到改进和完善。特别是近几年来，市场竞争日趋激烈，众多消费者把虹蹲鱼体表和肌肉的颜色（如红色程度）视为判断其营养优劣和健康状况的重要指标，因此生产红
Rainbow trout is the world’s most expensive cold-water fish, in our country more than 40 years of aquaculture history. With the continuous research of rainbow trout breeding technology, rainbow squat feed preparation has been continuously improved and perfected. Especially in recent years, competition in the market is becoming fiercer and fiercer. Many consumers consider the color (such as the degree of redness) of the body surface and muscles of the rainbow fish as an important index for judging the nutritional quality and health status of the fish. Therefore,