Cape Town, well, rather Swellendam (a small town 225Km outside of Cape Town) has it's own mermaid legend - that of the Kaaiman. From what I can tell sightings are extermely infrequent, with the last reported one being in 2008. The Kaaiman is apparantly a white woman with long black hair, red eyes, and a fish-like lower half. Read this story on Monstropedia for details on the 2008 sighting.