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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.
Answer: Canned tuna is quite stable and has a long shelf life compared to other canned seafood products. The best way to find the actual shelf life of your canned tuna is to check on the can label and determine the manufactures recommended shelf life. Typically this will be about 3 years. However, if the tuna can is stored in a dry pantry or shelf this can be increased by a few years. Of course you must make sure that the can has not been damaged or broken in any way and there are no air openings. See below for storage of canned tuna once opened.