The Asian arowana is the world’s costliest aquarium fish, rumored to sell for as much as $300,000. But a cheaper alternative is now available – and it comes in the form of an underwater drone! For the crazy rich Asians, the arowana aka “dragon fish” is a status symbol like no other. It is prized by Yakuza gang members in Japan. Chinese business tycoons are obsessed with it because they associate the fish’s red color and coin-like glimmering scales with good luck and prosperity.