 Competition with the Clanwilliam yellowfish ("Labeobarbus capensis") – another South African native that was introduced to the redfin's range – has reduced "B. erubescens" stocks in the Twee River.Ironically, both introductions were well-meaning but misguided attempts to deal with problems caused by animals introduced from foreign countries, that failed to take into account the extremely high level of local endemism in Western Cape Province – and in the case of the Clanwilliam yellowfish were even supported by the Cape Department of Nature Conservation.The exotic fishes that are harmful to the Twee River redfin are the bluegill ("Lepomis macrochirus") and the rainbow trout ("Oncorhynchus mykiss"), illegally released in its range in the 1990, probably by anglers.