Rhodeus sinensis is a subtropical freshwater ray-finned fish belonging to the family Acheilognathidae, the bitterlings. It originated in inland rivers in China, and has been introduced as an exotic species in Afghanistan. The fish reaches a length up to 5.2 cm (2.0 in), and is native to freshwater habitats with a pH of 6.8 to 7.8, a hardness of 20 DH, and a temperature of 10 to 25 °C (50 to 77 °F). When spawning, the females deposit their eggs inside bivalves, where they hatch and the young remain until they can swim.

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