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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.
Fresh tuna is usually sold already skinned since the skin is extremely tough. 1  When selecting fresh tuna, avoid any with dry or brown spots (other than the natural darker brown area). 2  If your refrigerator is not that cold, place the wrapped fish on a bed of ice or in a plastic bag filled with ice. Use within 24 hours. If you know the tuna is fresh and not previously frozen, feel free to wrap and freeze it.