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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.
Warnings. 1  Use canned tuna by the expiration date on the can. 2  If the can doesn't have a best by date, mark it with the date of purchase and use the tuna within 12 to 24 months of purchase. 3  Eat canned tuna as soon as possible after purchase to ensure that it is the best quality, texture and flavor.