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The two classmates from New York's Trinity school collected and sent off 60 fish samples to the University of Guelph in Canada. Of 56 samples that could be identified by a four-year-old DNA identification technique, 14 were mislabeled.

In all cases, the fish was labeled as a more costly type, apparently ruling out simple chance. It was the first known student use of DNA barcoding technology in a public market.

"It bears on a number of issues -- food safety, fraud and protection of endangered species," said Bob Hanner of Guelph, who oversaw the analysis of samples. Other imports, such as meat, could also benefit from DNA checks.