真三文鱼肉（姑且说野生是真的）的红色是来自于鱼的食物，它们在天然水域也要吃的。

而且世界上大部分三文鱼都是饲养的。

Since it started in the 1960s, the farmed salmon industry has grown substantially in the past decades, and today approximately 70% of salmon produced worldwide is farmed. In 2021, more than 2.8 million tons of farmed salmonids were produced. In comparison, only around 705,000 tons of wild salmonids were caught.（Published by M. Shahbandeh , Feb 16, 2023）

Farm-raised salmon are fed the carotenoids astaxanthin and canthaxanthin to match their flesh colour to wild salmon[92] to improve their marketability.[93] Wild salmon get these carotenoids, primarily astaxanthin, from eating shellfish and krill.(wiki)
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没用本质区别。当然你可以说天然三文鱼口感更好，这就跟金刚石和人工金刚石一样，得掌握话语权的人来说了。

【 在 madeinchina 的大作中提到: 】
: 真三文鱼要是白色鱼肉，那也没必要给虹鳟鱼喂了。
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