Is 5 yr old vacuum packed king salmon out of the fridge edible?

Vacuum-packed king salmon is typically safe to eat for at least 1-2 weeks in the refrigerator. However, it is recommended to check the "best before" date on the packaging to be sure. If the salmon has been vacuum-sealed for longer than 2 weeks, it is not recommended to eat it, as the quality of the fish may be compromised. It is always better to err on the side of caution when it comes to food safety. If the fish smells "off" or has a slimy texture, it is definitely not safe to eat.