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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.
Best Answer: Never leave anything out overnight. Yes, you can put canned tuna (or any other food) in the fridge overnight as long as you put it in an airtight container. Canned foods are cooked, sealed in the can, and cooked again to kill all the bacteria. Never keep anything more than 3 days after you open it. Source(s): certified food safety manager.