The lake minnow or swamp minnow (Rhynchocypris percnurus) is a Eurasian species of small freshwater cyprinid fish. It has a wide but disjunct distribution including parts of Europe (Belarus, Czech Republic, Germany, Lithuania, Poland, Russia, and Ukraine) and Asia (northern China, Japan, Korea, and Siberia).
Individuals in this species can grow up to 18.5 cm.[1]