Kosogol grayling (Thymallus nigrescens)

General data
- Main name: Kosogol grayling
- Habitat: Freshwater
Classification
- Genus: Thymallus - Graylings
- Family: Salmonidae - Salmons and Trouts
- Order: Salmoniformes - Salmons and Trouts
- Class: Teleostei - Ray-finned fishes
- Superclass: Osteichthyes - Bony fishes