I wouldn't touch farmed salmon even if you put a gun at my head. The unfortunate thing is that it creates jobs in areas where jobs can be hard to come by now, since so much previous industry etc was removed. If it was taken away the fall out would be huge, what is required is for it to be properly sorted out once and for all re the failings.
https://www.bbc.co.uk/news/articles/c9wx0l99457o
https://www.bbc.co.uk/news/articles/c9wx0l99457o