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Most salmon is fed colorants
Unless your supermarket salmon is specifically labeled ‘wild’, you can assume that, like 80% of salmon on the market, it comes from a fish farm. Wild salmon get their pink-colored flesh from their diet of shrimp, krill and small algae-eating fish. Farmed salmon are fed fish-food pellets containing the colorants canthaxanthin or astaxanthin. Without these additives, all farmed salmon flesh would be an unappetizing grey.