The red-tailed silverside, or zona (Bedotia geayi) is a species of Madagascar rainbowfish endemic to the Mananjary River drainage in Madagascar. It is threatened by habitat loss and introduced species. It has often been confused with the related B. madagascariensis, which is common in the aquarium trade. In addition to meristics, the two can be separated by the exact colour pattern on their tail fin (males of both typically have red in the tail) and the distinct red spot on the lower jaw of breeding male B. geayi (lacking in B. madagascariensis).
- Froese, Rainer and Pauly, Daniel, eds. (2014). "Bedotia geayi" in FishBase. April 2014 version.
- Loiselle, P.; Participants of the CBSG; ANGAP CAMP "Faune de Madagascar" workshop (2004). "Bedotia geayi". IUCN Red List of Threatened Species. Version 2014.1. International Union for Conservation of Nature.
- SeriouslyFish: Bedotia madagascarensis. Retrieved 3 July 2014.
- Loiselle, P.V.; and Rodriguez, D. (2007). A new species of Bedotia (Teleostei: Atherinomorpha: Bedotiidae) from the Rianila drainage of Eastern Madagascar, with redescriptions of Bedotia madagascariensis and Bedotia geayi. Zootaxa 1520: 1-18.
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