Petrochromis macrognathus Yamaoka 1983

Cryptic species between rocks near shore (Ref. 35773). Occurs in the upper 2-3 m of the water column (Ref. 7343, 46829, 52921). Feeds by scraping loose algae from the vertical faces of boulders in turbulent water (Ref. 6770, 46829). In order to cope with the movement of the surge its feeding speed is fast; very shy species; males are territorial and hide in large caves when threatened (Ref. 46829). Often solitary but more than 2 individuals may be seen at once (Ref. 7343).

fisheries: ; aquarium: commercial

Petrochromis macrognathus is a species of cichlid endemic to Lake Tanganyika found in areas with rocky substrates where it can graze on algae. This species can reach a length of 16.2 cm (6.4 in). It can be found in the aquarium trade.