Lohi

http://www.smoker-cooking.com/coldsmokedsalmon.html
The Salmon

Fresh salmon and previously frozen salmon are not equals when it comes to cold smoking salmon. Freezing actually benefits the cold smoked salmon in a couple of ways.

Freezing Ruptures Cell Membranes
Freezing Kills Parasites

As the salmon freezes, the liquid in the cells expands, causing the cell walls to rupture. When thawed, liquid drains readily from the flesh, meaning there's less water for the brine to remove.
Freezing also kill parasites. One week at minus ten degrees Fahrenheit kills parasites that would otherwise survive brining and cold smoking. To be safe, deep-freeze cold smoked salmon that has been prepared from fresh, never frozen fish.