the olifants river marks the northern limit of the cape galaxias "(galaxias zebratus)", a south african fish species sharing the same habitat as imported trout species and living in an area between the olifants and the keurbooms river. although in south africa this relatively delicate fish is only near threatened, in australia species of the same genus were driven to extinction by competing salmonids. other species that occur in the olifants riverine system include twee river redfin, ("pseudobarbus erubescens"), fiery redfin ("pseudobarbus phlegethon"), "austroglanis barnardi", clanwilliam rock-catfish ("austroglanis gilli"), chubbyhead barb ("enteromius anoplus"), and clanwilliam sandfish ("labeo seeberi").