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将４月龄花玛丽鱼（Ｍｏｌｌｉｅｎｓｉａ Ｖｅｌｉｆｅｒａ）３００尾随机分成６组，每组５０尾，设１对照组和５个处理组，各处理组饲料在对照组饲料的基础上分别添加１００ｍｇ／ｋｇ、２００ｍｇ／ｋｇ、３００ｍｇ／ｋｇ、４００ｍｇ／ｋｇ、５００ｍｇ／ｋｇ的类胡萝卜素（Ｃａｅｒｏｔｅｎｏｉｄｓ），在近２个月的试验中，每隔７ ｄ从每一组中随机抽取５－６尾鱼测定鱼体肌肉中所含类胡萝卜素的量，通过对鱼体体色的对比观察和鱼体肌肉中所沉积的类胡萝卜素量的比较，结果表明：花玛丽鱼饮料中添加类胡萝卜素的最适添加量为４ｍｇ／ｋｇ。
Three hundred four-month-old Molliensia Velifera were randomly divided into 6 groups with 50 in each group. One control group and five treatment groups were set up. Each treatment group was fed 100 mg / kg on the basis of the control group, 200 mg / kg, 300 mg / kg, 400 mg / kg and 500 mg / kg of carotenoids, 5-6 tilapia fish were randomly selected from each group every 7 days in the nearly 2-month test The amount of carotenoid contained in the body muscle was compared with the body color of the fish and the amount of carotenoid deposited in the muscle of the fish. The results showed that the optimum amount of carotenoids Add the amount of 4mg / kg.