Barbonymus schwanenfeldii can be distinguished from other closely related Barbonymus species by its red dorsal fin with a black blotch at the tip, red pectoral, pelvic and anal fins, red caudal fin with white margin and a black submarginal stripe ...
Females are yellow with a black submarginal band in the dorsal fin in the southern populations while they are silvery-beige north of Mepdona. This species, like all Tropheops species, feeds by tearing off filamentous algal strands from the substrate.
It is distinguishable from other species of the genus in having a red dorsal fin with a black blotch at the tip, red pectoral, pelvic and anal fins, red caudal fin with white margin and a black submarginal stripe along each lobe, ...
Apistogramma agassizii males have a very pronounced spade shaped tail while Apistogramma is much rounder with a white submarginal band.. In his original description Kullander thought that there were a number of features that made A.
The subject species' body colouration is more silvery, and the red caudal fin has a distinct black submarginal stripe along both lobes; this is absent on B. altus, whose colouration is more golden than silver.
The dorsal fin is red and has a black marking or blotch along the tip. The pectoral, pelvic and anal fins are also red. The caudal fin is orange or a deep red and has black lines submarginally on the upper and lower portions of each lob.
Orange and blue accents may be present just in front of this keyhole blotch on their black body. Their dorsal, anal, and caudal fins have submarginal blue lines, and the lower part of the anal fin is yellow, demarcated from the black by a white line.
 See also: Filament, Plants, Water, Pectoral, Origin
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