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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.
The latest commercial innovation is tuna packed in vacuum pouches with no added oil or water. Unopened canned tuna can be stored in a cool cupboard up to 1 year. Place leftover canned tuna in a sealed container in the refrigerator and use with four days. Tuna salad with a dressing can be refrigerated up to three days.