Oceana found—probably similar to you—that about 22% of retail was actually mislabelled. They used your standards of the fish classification—with 200 species, for example, classified as snapper, which seems confusing to me. It was all DNA-tested at an independent lab, so I think it's a pretty valuable study.
Has the government ever considered labelling for farmed salmon and aquaculture fish and also the distinction between those farmed in Canada and those farmed abroad?