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A: Once your canned tuna has been opened it must be kept in a refrigerator if you did not eat all of it. If wrapped properly and stored in your fridge it should last for around three days.
Most agree that this practice originated with a 1987 law required by the state of New Jersey to put an expiration date on all food products (including water); however, in 2004, New Jersey changed the law to simply mark the bottle with the date produced.