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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.
Expiration dates are a recommendation for unopened cans, jars, bottles, or packages. Once opened, the date is no longer valid in most cases, and shelf life has to be estimated from that point forward. Some products specifically say âonce opened, use within 7 days.â Always follow such product instructions.