There are 75 species of fish belonging to 36 genera and 11 families living in Mongolia rivers and lakes of with 10 species are of 5 families in the Enclosed Basin of Central Asia, 22 species of 11 families in the Arctic basin and 43 species of 11 families in the Pacific Ocean.
Currently 38 species of fish are observed in the River Kherlen which flows in Gun-Galuut Nature Reserve. It includes, Taimen (Hucho Taimen), Lenok (Brachymystax lenok), Amur pike (Esox reicherti), Burbot (Lota lota), Amur dase (Leuciscus waleski) and Flathead asp (Pseudaspius parva) and many more.

The Nature Reserve is open for all 4 seasons with its rich fishery, amazing nature beauty and wilderness. You have opportunities to fish for Taimen – The River King as the world class fishermen call it. List of fish species in the River Kherlen

REPTILES
The most common reptile in Mongolia, Central Asian Viper /Agkistrodon Halys/ is found in the Nature Reserve. Also Pallas’ Coluber /Elafhe dione fallas/ is found here too. Mongolian racerunner /Eremias argus peters/ is the commonest reptile of the Nature Reserve.

AMPHIBIANS
Toads are the commonest in Gun-Galuut from the Amphibians. Siberian Sand Toad /Bufo raddei/ and Siberian wood frog /Rana Amurensisare/ found in wetlands and lakes and along the rivers. They are the main food for wetland birds.