Mesogobio lachnerithe Yalu River gudgeon, is a species of freshwater ray-finned fish belonging to the family Gobionidae, the gudgeons. It is endemic to the Yalu River on the border between China and North Korea.
Named in honor of Ernest A. Lachner (1916-1996), curator of fishes at the U.S. National Museum, for facilitating the senior authorâÂÂs visits to several museums in the United States.