 The Cape kurper ("Sandelia capensis") is native to South Africa but does not occur naturally in the Twee River redfin's range; it has been introduced to the Suurvlei River, however.The kurper competes with the redfin for food and probably also eats young "B. erubescens".It is the probable cause for the redfin's disappearance from the lower Suurvlei River.