A recent study conducted by two New York City high-school students shows that fish is commonly misnamed. When 60 fish samples from four sushi restaurants and 10 supermarkets were inspected using a genetic fingerprinting technique, a quarter turned out to be mislabeled.
Some findings: "White tuna" was really Mozambique tilapia, a much cheaper, commercially farmed fish. "Flying fish roe" was actually smelt roe. And more than 75 percent of "red snapper" samples weren't the real McCoy: Instead, they turned out to be everything from Atlantic cod fish to endangered Acadian redfish.
This study was done on a small scale, but according to the New York Times, it's "unlikely to be a mere statistical fluke."