The Asian arowana, also known as the dragon fish, is believed by the Chinese to bring good luck and prosperity due to its red color and coin-like scales. The Asian arowana is the world’s most expensive aquarium fish. It is a tropical freshwater fish from Southeast Asia that grows three feet long in the wild. That’s roughly the size of a snowshoe. It is a fierce predator dating back to the age of the dinosaurs. It has large, metallic scales, like coins; whiskers that jut from its chin; and it undulate like the paper dragons you see in a Chinese New Year’s parade. That resemblance has spawned the belief that the fish brings good luck and prosperity, which is why it has become a highly sought-after aquarium Fish.