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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.
Raw tuna can be safely stored for up to two days at temperatures of 39 degrees Fahrenheit or below. Refrigerated cooked tuna is safe to consume for five days after preparation. Canned tuna used in casseroles and salads will last for five days in the refrigerator.