KALI9 / GETTY IMAGES, Tiny Fox Lab
Farm-raised salmon are naturally grey while wild salmon are naturally pink due to their diet which includes astaxanthin, a compound found in krill and shrimp. Salmon farmers have to add astaxanthin to their feed to give them the pink color. It is the most expensive part of their food. – Tiny Fox Lab Facts
Preview photo credit: KALI9 / GETTY IMAGES
Source: https://www.wired.com/2004/02/the-15-colors-of-salmon/
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