Taimen (Hucho taimen) are a landlocked salmonid that can grow to huge proportions.  They are an aggressive fish that feed on anything that they can fit in their mouth, from minnows and fry to mature grayling and trout, or even small birds or rodents.   The average Taimen in the rivers we fish are around 30 inches long, weighing roughly 12lbs, but there are many of over 40 inches, around 20lbs, and we have opportunities to catch taimen of over 50 inches on most trips.   Taimen can grow up to a massive 70 inches, although these monsters are extremely rare and only found in the remotest locations.   

Lenok (Brachymstax lenok) are the Mongolian equivalent of a trout, distantly related to Char, generally around 15 to 20 inches (2 to 3 lb) they can grow to over 30 inches in Mongolia.  These are an exciting sport fish.  Grayling are plentiful in Mongolia's waters and there are in fact four sub-species here.