Lethenteron reissneri, the Far Eastern brook lamprey, is a specieslamprey. 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.[4]
