Up to a quarter of fish in stores and restaurants in New York City was mislabeled as a more expensive variety, according to samples collected by two U.S. teenagers and tested with modern genetic identification methods.In the worst cases, two samples of filleted fish sold as red snapper, caught mostly off the southeast United States and in the Caribbean, were instead the endangered Acadian redfish from the North Atlantic, according to the tests, revealed on Friday.
“We never expected these results. People should get what they pay for,” Kate Stoeckle, 18, told Reuters of the project with Louisa Strauss, 17.
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.
“We really like sushi and we’d take home fish samples and put them in alcohol,” Stoeckle said of fish bought in shops and restaurants in Upper Manhattan.
Stoeckle’s father Mark is an expert in genetic barcoding — a system that produces a unique readout of a species’ genes similar to the black and white barcode stripes often used to identify items sold in shops.
“Americans spend an estimated $70 billion per year on seafood and we think authorities should do routine DNA barcoding of fish,” Louisa Strauss said in a statement. Costs of barcoding run to tens of dollars per sample.
Up to a quarter of fish in stores and restaurants in New York City was mislabeled as a more expensive variety, according to samples collected by two U.S. teenagers and tested with modern genetic identification methods.
In the worst cases, two samples of filleted fish sold as red snapper, caught mostly off the southeast United States and in the Caribbean, were instead the endangered Acadian redfish from the North Atlantic, according to the tests, revealed on Friday.
“We never expected these results. People should get what they pay for,” Kate Stoeckle, 18, told Reuters of the project with Louisa Strauss, 17.
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.
“We really like sushi and we’d take home fish samples and put them in alcohol,” Stoeckle said of fish bought in shops and restaurants in Upper Manhattan.
Stoeckle’s father Mark is an expert in genetic barcoding — a system that produces a unique readout of a species’ genes similar to the black and white barcode stripes often used to identify items sold in shops.
“Americans spend an estimated $70 billion per year on seafood and we think authorities should do routine DNA barcoding of fish,” Louisa Strauss said in a statement. Costs of barcoding run to tens of dollars per sample.