Interesting article. It seems to be saying that wild salmon are pink because of a pigment in their diet, but farmed salmon are only pink because of a pigment in their diet.
Indeed. Farmed ones aren't given the same diet. I suspect it's not as healthy for them either, but it does well enough for industrial purposes. Think of cattle feed v grass, etc
https://www.foodandwine.com/news/your-salmon-might-be-lying-...