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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.
1 Buy a six-ounce steak per serving you need. 2  If you're using frozen tuna steak, thaw it completely and put in the refrigerator before using.  Fresh tuna is in season from late spring to early fall. If you're choosing fresh tuna, it's best to get it while it's in season.