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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.
How long does raw tuna last after being frozen and thawed? Tuna that has been defrosted in the fridge can be kept for an additional 1 to 2 days in the refrigerator before cooking; tuna that was thawed in the microwave or in cold water should be cooked immediately.