Oncorhynchus mykiss

Rainbow trout (Oncorhynchus mykiss) is among the most widely introduced fish in rivers of the Cape Floristic Region, and may pose a serious threat to endemic fish such as redfin minnows, members of the genus Pseudobarbus, which are a unique and vulnerable group of freshwater fishes. In the Cape Floristic Region alone, there are twelve species of redfin minnow, some of which live in only a single river or stretch of river. Nine Cape minnow species face a serious threat of extinction by introduced predatory fish, such as trout.