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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 can be frozen for three to four months. To freeze tuna properly, it should be removed from the original can or pouch and placed in an airtight, freezer-proof bag or container, with all excess air removed before freezing. Continue Reading.