If you buy cans of store-brand tuna at Trader Joe’s, you may want to check the contents carefully.

That's because a lawsuit filed in a Manhattan federal court Tuesday claims that Trader Joe's underfilled its 5-ounce cans of tuna. According to the lawsuit, tests conducted by the U.S. National Oceanic and Atmospheric Administration found that the Trader Joe's cans of tuna contained an average of 2.43 to 2.87 ounces of tuna. The federal minimum standard is 3.23 ounces per 5-ounce can, according to CNBC.

The lawsuit alleges the Trader Joe’s tuna is “illegal for sale in the United States” due to the underweight cans.

Trader Joe’s spokeswoman Alison Mochizuki wrote in a statement that the company does not comment on pending litigation.

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