The Color of Salmon
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/