Because it can be stored in the refrigerator for many days without going bad, tuna fish salad is an excellent choice for a lunch that can prepare in advance. Because it contains fish and mayonnaise, you should be sure not to leave it out on the counter for excessive time. When you finish making your sandwich, please place it in a container that can seal air out and return it to the refrigerator to stay as fresh as possible. On a butter cracker, a dollop of tuna salad in scoop form.