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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.
Life in the Cold Lane. To ensure the best storage life for your tuna, keep it cold from start to finish. Buy your ahi just before leaving the store, instead of walking around with it in your cart, and keep it cold on the way home with ice or a freezer gel pack if you live in a warm climate.