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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.
For tuna salad, I would think the tuna would spoil quickest. This is from Bumblebees website regarding canned or pouched seafood; once cans or pouches are opened, any unused contents should be immediately refrigerated and utilized within one to two days.