Many of us understand that when it comes to a cold or the flu, we're most contagious before we start feeling sick; that by the time we've got a runny nose, sore throat and achy muscles, the damage to the people around us has already been done. In fact, many of us are completely wrong.
Immediately refrigerate leftover canned tuna in a glass or plastic container. Do not leave the tuna in the opened can, as it may become rusty once open. You can refrigerate canned tuna in a tightly covered container for up to two days. If you are storing your canned tuna in an unheated garage, ensure that it does not freeze during the winter months. This can cause the can to bulge or rust.
The latest commercial innovation is tuna packed in vacuum pouches with no added oil or water. Unopened canned tuna can be stored in a cool cupboard up to 1 year. Place leftover canned tuna in a sealed container in the refrigerator and use with four days. Tuna salad with a dressing can be refrigerated up to three days. Cooked tuna dishes such as casseroles can be frozen up to 2 months.