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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.
Place a freezer label on each container of tuna, and use a permanent marker to add an expiration date up to four months ahead. Defrost frozen tuna in the refrigerator until it is completely thawed. The U.S Department of Agriculture warns that food frozen in cans can present a health hazard because cans may bulge, rust or split open, causing the canned food to spoil.