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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.
Canned tuna is as durable as any food can be, with a shelf life measured in years. That's not the case with fresh tuna, which, like other seafood, is extremely perishable. It must be held under refrigeration at all times before it's cooked, and any leftovers must be returned to the refrigerator as soon as possible after cooking.