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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.
Cooked tuna will usually stay good for 3 to 4 days in the fridge and 4 months in the freezer. How to tell if raw tuna is bad? The best way is to smell and look at the tuna: signs of bad tuna are a sour smell, dull color and slimy texture; discard any tuna with an off smell or appearance.