When you think of mermaids, it’s hard not to picture the fish-tailed princess imagined by Hans Christian Andersen in his classic fairy tale: “her skin was as clear and delicate as a rose petal, and her eyes as blue as the deepest sea.”When you think of mermaids, it’s hard not to picture the fish-tailed princess imagined by Hans Christian Andersen in his classic fairy tale: “her skin was as clear and delicate as a rose petal, and her eyes as blue as the deepest sea.”