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.
Best Answer: Never leave anything out overnight. Yes, you can put canned tuna (or any other food) in the fridge overnight as long as you put it in an airtight container. Canned foods are cooked, sealed in the can, and cooked again to kill all the bacteria. Never keep anything more than 3 days after you open it. Source(s): certified food safety manager.