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日本山田养殖场试验利用类胡萝卜素来改变虹鳟鱼的颜色获得成功。其方法是利用Adonis activalis(一种金盏花属)的花瓣中提取的所含的金黄色类胡萝卜素作为色素源(不可用花瓣直接添加)
Yamada farm trials in Japan have used carotenoids to change rainbow trout color success. The method uses the golden yellow carotenoid contained in the petal of Adonis activalis (a kind of marigold flower) as a pigment source (it can not be directly added with petals)