Found in rocky substrates. Restricted to places with large, very steeply sloping boulders, where it inhabits the immediately inshore slope between 0.5 and at least 5 m water depth and lives in crevices between boulders, including rock pools within emerged rocky reefs. Stomach content analyses of males showed a seasonally variable diet of insect larvae, filamentous Cyanophyta, Bryozoa, prawns, detritus and juvenile fish .
Dorsal spines (total): 15 - 16; Dorsal soft rays (total): 9 - 10; Anal spines: 3; Anal soft rays: 9 - 10; Vertebrae: 29 - 31. : fusiform / normal.
Behavioural data for Haplochromis Xanthopteryx is currently being reviewed.
Diet information for Haplochromis Xanthopteryx is currently being compiled.
A polygynous female mouth brooder with maternal parental care.
Freshwater; demersal. Tropical endemic to the Mwanza Gulf in southern Lake Victoria, Tanzania.
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