Brachymystax lenok, the sharp-snouted lenok, is a salmonid fish distributed in rivers and lakes in northeastern Asia. It formerly included the blunt-snouted lenok, but recent authorities typically treat the latter as a separate species, B. tumensis, based on differences in morphology and genetics.
- Series: Fish
- Country: Mongolia
- Year: 1965-11-25
- Emission: Commemorative
- Perforation: comb 11
- Printing: Photogravure
- Size: 43 x 43 mm
- Face value: 10 Mongolian möngö
- Number of catalogue Michel: MN 399