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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.
Make sure the rim of the jar and lid are wiped clean before putting it away.   the salsa my wife made cooked and jarred was opened a little over two .5 wks ago well....... there should be an expiration date on the jar..........