Lethenteron reissneri
{{Short description|Species of jawless fish}}
{{Speciesbox
| image = Eastern-brook-lamprey_L_reissneri-02.jpg
| status = LC
| status_system = IUCN3.1
| genus = Lethenteron
| species = reissneri
| authority = (Dybowski, 1869)
}}
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.{{cite book |author=Claude B. Renaud|title=Lampreys of the World|series=FAO Species Catalogue for Fishery Purposes No. 5|url=http://www.fao.org/docrep/015/i2335e/i2335e00.htm}} It is found in lakes and rivers in China, Japan, Korea, Mongolia, and the Russian Far East.{{FishBase |id=17205|Lethenteron|reissneri}} It may be identical to the Siberian brook lamprey, Lethenteron kessleri, but molecular evidence suggests they are cryptic species.{{Cite journal |last=Yamazaki |first=Y. |last2=Yokoyama |first2=R. |last3=Nishida |first3=M. |last4=Goto |first4=A. |title=Taxonomy and molecular phylogeny of Lethenteron lampreys in eastern Eurasia |url=https://onlinelibrary.wiley.com/doi/10.1111/j.0022-1112.2006.01070.x |journal=Journal of Fish Biology |language=en |publication-date=7 June 2006 |volume=68 |issue=SB |pages=251–269 |doi=10.1111/j.0022-1112.2006.01070.x |issn=0022-1112}}