Thymallus nigrescens

Thymallus nigrescens, also known as the Hovsgol grayling, is a species of freshwater fish in the salmon family. It is endemic to the Mongolian Lake Khovsgol where they usually live near or on the bottom of the lake.

Description
Hovsgol grayling can reach a recorded maximum length of 48.4 cm (19 inches) while the average size varies between 17 and 20 cm (6.6 - 7.9 inches). The species are omnivorous and mainly feed on plankton.