Special report | Fishy business

How the Globe tested fish

Fish samples were collected from restaurants and grocery stores across Massachusetts. Most of the testing was focused on certain species — including Atlantic cod and tuna — because they have been identified by regulators as more likely to be mislabeled.

 Each sample included the receipt and was labeled with the date collected, restaurant or store name, and price. Samples were stored in industrial freezers in a locked room at the Globe.


 Using a sanitized scalpel, reporters placed small pieces of fish — roughly the size of a Q-tip head — in separate ethanol-filled test tubes supplied by officials at the Biodiversity Institute of Ontario at the University of Guelph, which is home to a 26-nation consortium called the International Barcode of Life.

 Test tubes were sent by express mail to the Biodiversity Institute.

Get Talking Points in your inbox:
An afternoon recap of the day’s most important business news, delivered weekdays.
Thank you for signing up! Sign up for more newsletters here

 Barcode of Life researchers successfully conducted DNA analysis from most of the samples, matching them with a species in their database. Two samples were discarded because the DNA could not be read. The Globe also sent a select group of specimens to a second lab for DNA testing.

RESULTS: Of 76 fish samples collected from stores and restaurants that sold mislabeled fish in 2011, more than three-quarters of them were again mislabeled in 2012.

Loading comments...
Real journalists. Real journalism. Subscribe to The Boston Globe today.
We hope you've enjoyed your free articles.
Continue reading by subscribing to for just 99¢.
 Already a member? Log in Home
Subscriber Log In

We hope you've enjoyed your 5 free articles'

Stay informed with unlimited access to Boston’s trusted news source.

  • High-quality journalism from the region’s largest newsroom
  • Convenient access across all of your devices
  • Today’s Headlines daily newsletter
  • Subscriber-only access to exclusive offers, events, contests, eBooks, and more
  • Less than 25¢ a week
Marketing image of
Marketing image of