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The Boston Globe

Business

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.

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