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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.
Canned salmon is fully cooked and will keep for several years (The official expiration date is five years after the canning date). As with our canned tuna and sardines, opened salmon tins may be kept in the refrigerator for a day or two. Much longer and the fats will begin to oxidize and become rancid.