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Farmed salmon doesn't have the red colour we associate with salmon, and they add that colour later so that it looks right to us.

https://www.foodandwine.com/news/your-salmon-might-be-lying-...

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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

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