Well… close. The Golden Age Aquaman's parents were famous marine biologists, and they modified his biology so that he could breathe underwater, survive the environment of the depths, and move in the sea as naturally as he could walk on land. But this was done through scientific means, not through sorcery. So think Captain Nemo if he didn't need to put on a diving suit in order to exit the Nautilus. But yeah; other than that, you got the concept I was going for.