If the salmon you have is only partially thawed out, you will in fact be able to put it back into the freezer for a while in order to keep it from going bad. Those who want to keep their salmon around for as long as possible will definitely need to put it in the freezer in order to avoid bacteria forming on it over time, which can cause serious health problems.

Although it is true that there are certain types of foods that cannot be refrozen, salmon is not one of them. Since it only lasts a couple days in the refrigerator, the freezer is really the best place for it.