Yeah, never have I had any luck with frozen fish and it's mostly because of the textural change and the taste of course, I have not bought frozen fish in decades but have had it served to me more than once, basically I'd rather go without and I'm not trying to be snobby, it's just, cooking is what I did for a living and buying and eating food I don't like is a no go every time.
Yes, wild caught salmon is also a no go in the US, it's against the law basically under the Endangered Species Act and in Canada you might get lucky if you knew someone that had access, specifically it would be Canadian indigenous peoples who are allowed to fish for it, basically very limited and pretty much not available, so yeah it's all farmed. Personally I don't normally consumed farmed if i can help it, so I'm biased, just getting that out there.