All Burtoni are endemic from tanganyika lake, it is a fish of the swamp zone of the lake , it can also be found in the river lake basin Rusizi/Ruzizi, Malagarazi, Ifume, Mutambala ... but clearly it doesn't exist in Victoria lake!
Apparently also collected in others lake see :http://www.africancichlids.net/articles/astatotilapia_burtoni/
Two forms exist a blue and a yellow
Name Astatotilapia burtoni and Haplochromis sp. burtoni are synonyms
in France / Belgium
we have this fish
Haplochromis cf. burtoni "Cathy" Bujumbura (in blue or yellow), this should be the same as the burundi morph