Claim: The muksun, a whitefish found in the freshened areas of the Kara and Laptev Seas, can live no more than five years of age.
Evidence: The muksun (Coregonus muksun) is a type of whitefish widespread in the Siberian Arctic waters. It is mostly found in the freshened areas of the Kara and Laptev Seas and up the major rivers, as well as in Lake Taymyr. Depending on population, the muksun can live up to 16–25 years of age.