Rapti

This species is sometimes sold under the trade name of 'chameleon fish' due to its ability to rapidly change colour, especially when breeding or stressed. It was originally described as Labrus badis by Hamilton but Bleeker reclassified it as Badis buchanani in 1854; he had adopted the species name 'badis' as the new name for the genus and wished to avoid using a tautonym. At that time the use of tautonyms was avoided in zoological taxonomy but is now permissible under ICZN ru...

Type locality is given as 'Cedawáti [Vedawati] stream, headwaters of Krishna River near Heriuru, Mysore, India', with the species currently considered to occur throughout India, Bangladesh, Nepal, and probably Bhutan. It's also been recorded in Pakistan, Myanmar, Thailand and Sri Lanka although some or all of these reports may refer to other species.