They had potential health impacts. For example, the type of species substituted had higher risk of certain environmental contaminants. We came to the number by cross-referencing the CFIA's fish list, which lists all of the potential health impacts of certain species.
We cross-referenced the substituted species that CFIA flagged as having associated health risks with what was on the label. In that 60% of cases, they were fish with flagged health concerns that weren't reflected in the species on the label.