The great seafood-restaurant swindle

Those were among the findings of a five-month Globe investigation into the mislabeling of fish. It showed that Massachusetts consumers routinely and unwittingly overpay for less desirable, sometimes undesirable, species – or buy seafood that is simply not what it is advertised to be. In many cases, the fish was caught thousands of miles away and frozen, not hauled in by local fishermen, as the menu claimed. It may be perfectly palatable – just not what the customer ordered. But sometimes mislabeled seafood can cause allergic reactions, violate dietary restrictions, or contain chemicals banned in the United States.

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The Globe collected fish from 134 restaurants, grocery stores, and seafood markets from Leominster to Provincetown, and hired a laboratory in Canada to conduct DNA testing on the samples. Analyses by the DNA lab and other scientists showed that 87 of 183 were sold with the wrong species name – 48 percent.

The results underscore the dramatic lack of oversight in the seafood business compared with other food industries such as meat and poultry. Nationally, mislabeled fish is estimated to cost diners and the industry up to hundreds of millions of dollars annually, according to the National Fisheries Institute, a trade group.

It happens for a range of reasons, from outright fraud to a chef’s ignorance to the sometimes real difficulty of discerning one fillet from another. But industry specialists say money is commonly the motivator: It’s a way to increase profits – a cheaper fish sold as something more pricey – on the assumption that customers will not detect the difference.

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