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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.
Use within 24 hours. If you know the tuna is fresh and not previously frozen, feel free to wrap and freeze it. However, if you're buying fresh tuna in a grocery store, you can almost bet it has been previously frozen, in which case it is best to use it immediately.