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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.
Quick Answer. Fresh, uncooked tuna keeps in the refrigerator for up to two days before it should be used or frozen. A prepared dish like tuna salad is safe for up to five days, while cooked tuna leftovers should be eaten within four days for maximum safety. Continue Reading.