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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.
The open lid means the expiration date applies once the product is opened or the seal is removed. The letter is usually an M for month or Y for year. So if you see 12 M on the symbol that means the product will last up to 12 months after it has been opened.