Wild salmon gets its distinctive pink color from its krill-based diet. Farm raised salmon, without access to krill, is not actually pink. It's grey. Since no one wants to eat grey salmon, fisheries give the salmon a color boost by using artificial dyes in their feed. One such chemical, Canthaxanthin, has been linked to retinal damage in humans. Dyed salmon should be labeled as such in stores, but this law is poorly enforced. Ask your fishmonger to be sure.
