Merfolk are a race of humans who have mutated into half-fish, half-human creatures. Their city of Atlanta was taken off the coast and set to sea, where it sank. The humans then quickly mutated because of the Coca-Cola bottling plant's leakage.
Merfolk reproduce differently than humans because of their tails. It is similar to a fish's reproductive ways. The female lays her eggs and then the male sprays them with his fertilizer.