The Kyushu bitterling (Rhodeus atremius) is a temperate freshwater fish belonging to the Acheilognathinae subfamily of the Cyprinidae family. It originates on Kyushu Island in Japan. It was originally described as Acanthorhodeus atremius by Jordan & Thompson in 1914. The fish reaches a size of up to 6 cm (2.5 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).
There are two currently recognised subspecies, Rhodeus atremius atremius and R. a. suigensis.
- Devi, R. & Boguskaya, N (2009). "Rhodeus atremius". The IUCN Red List of Threatened Species. IUCN. 2009: e.T62206A12581319. doi:10.2305/IUCN.UK.2009-2.RLTS.T62206A12581319.en. Retrieved 14 January 2018.
- Froese, Rainer and Pauly, Daniel, eds. (2007). "Rhodeus atremius" in FishBase. February 2007 version.
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