Lethenteron reissneri, the Far Eastern brook lamprey, is a species of lamprey.

Immature L reissneri are parasitic, but shift to a non-parasitic feeding strategy upon reaching maturity.

[2] It is found in lakes and rivers in China, Japan, Korea, Mongolia, and the Russian Far East.

[3] It may be identical to the Siberian brook lamprey, Lethenteron kessleri, but molecular evidence suggests they are cryptic species.

This jawless fish-related article is a stub.