The lake minnow or swamp minnow (Rhynchocypris percnurus) is a Eurasian species of small freshwater cyprinid fish.

[2] 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).

[1] Individuals in this species can grow up to 18.5 cm.

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