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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.
Good luck. Source(s): lots of foods once opened will tell you on packaging how long. If kept closed up to 3 months, providing the temp. in your freezer is set right also.darkgodzion69 Â· 8 years ago.Thumbs up.ood luck. Source(s): lots of foods once opened will tell you on packaging how long. If kept closed up to 3 months, providing the temp. in your freezer is set right also.