Up to a quarter of fish in stores and restaurants in New York City was mislabelled as a more expensive variety, according to samples collected by two U.S. teenagers and tested with modern genetic identification methods.

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 mislabelled.

In all cases, the fish was labelled 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.

Read more here: Teenage DNA sleuths expose New York fish fraud – Yahoo! News