Oceana Canada has conducted a study in 2017 and 2018 and collected 382 samples of snapper, sea bass, sole and other fish that other studies indicate are often substituted. The samples came from 177 retailers and restaurants in five Canadian cities, and were sent to the University of Guelph for DNA barcoding. The study found that 44% of the samples were mislabelled. In particular it found cheaper haddock and pollock substituted for cod; farmed salmon served up as wild salmon; and escolar (a fish banned in many countries because of its health risks) masquerading as butterfish or white tuna. In addition, every single sample of so-called “red snapper” tested was actually another species.
Read Oceana's Report here