We studied Lakers when I lived in the Arctic.
The lakes locally known as Husky Lakes (Eskimo Lakes on most maps) are actually the remnants of the ancient McKenzie River waterway. It held two distinct populations - one in the upper lakes, and one in the lower adjacent to the salt chuck. The latter actually moved into the estuaries to forage, and got massive as a consequence. Oldest among the snaky uphill versions we found was mid to late 40's. The lower populations on the other hand were proven to live as long as early 70's.
Rather adaptable, long living species IMO.
Cheers - Nog
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