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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.
Stored in the refrigerator at constant temperatures of 39 F and below, raw tuna remains fresh up to two days. Once cooked, the refrigeration time is extended to five days. Canned tuna, which is actually cooked before canning, also lasts four to five days after it's opened, whether mixed in a salad or by itself. Unopened cans do not require refrigeration, remaining fresh for up to three years in the cupboard.