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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.
Note that the shorter shelf life after opening must run within the unopened period otherwise it should be reduced accordingly. For example, if the recommended expiry after opening is 3 months then if the bottle is opened, say, 2 months from the expiry date, then the expiry after opening is reduced to 2 months.