I think we may have missed part of the story. Wild salmon eat masses of
oceanic crustaceans that contain the orange or red pigment that makes
flamingos pink, scarlet ibises scarlet, and the meat of wild salmon
red. Farmed fish don't have access to crustaceans, so the fishfeed
formulators put red dye into the food to color the flesh as the
consumers have come to expect it to be.

There are scientific studies that claim the dye is harmful and should
not be eaten with consistency. And many of us like fish as a favorite
food to go after salmon with consistency.

Can't catch wild ones because of habitat degradation and overfishing
(Alaska silver salmon sport limit is down to one per day from six per
day as late as 1998). Can't eat the pen-reared ones because they're not
good for your body. Switch off to another favorite fish is the only
plan I have. My Mom used to tell me "there are plenty of fish in the
sea." She was talking about girls then, but I find that, fish or
girls, there are fewer and fewer keepers and the sea isn't as
well-populated now, either way you take it.