fortunately or unfortunately, depending on your point of view, all trout species were introduced into south Africa. there are a large number of indigenous species here in south Africa, too numerous to mention.
here in the western cape the indigenous fishes threatened, to a greater or lesser extent, are members of the barb and galaxiid families.
we're also blessed to have a variety of indigenous yellowfishes to catch on fly and they're awesome. (google yellowfish and you'll see what I mean.)