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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.
Tips. 1  Immediately refrigerate leftover canned tuna in a glass or plastic container. Do not leave the tuna in the opened can, as it may become rusty once open. 2  If you are storing your canned tuna in an unheated garage, ensure that it does not freeze during the winter months. This can cause the can to bulge or rust.