If you're purchasing fish at the supermarket, buyer beware! As this Marketplace doc discovers, the labels on fish may be hiding the facts. Using cutting-edge technology, their team tests more than 150 pieces of fish — everything from halibut to sea bass to shark — bought from major chains across Canada. The results reveal some questionable business ethics and may mean that Canadians are being overcharged, left unable to make wise ecological choices, and vulnerable to food safety concerns.