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That’s not super true. Salmon for instance. Or Easter eggs.

Wild salmon have their characteristic color because they are eating organisms that contain the naturally occurring Astaxanthin. Farmed salmon subsist on grains, fish oils, etc and come out looking grey unless pigments are added to their feed.

https://en.wikipedia.org/wiki/Astaxanthin

Great lakes salmon flesh lacks orange coloring as well

Definitely not.

https://www.youtube.com/watch?v=Cvvshpw4FxM

Check at 6 minutes into the video.

interesting, the Salmon I have caught has not been as colorful- I mostly fish in the rivers though

edit: it looks like that vid had some steelhead (trout) mixed in? This is more like what I have seen, but the color is even more "dulled" in person https://www.youtube.com/watch?v=e09UmeqAd4g

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