-African Arowana - origined from Africa and it is the most common Arowana available . The African Arowana has a rounded head with smoother and rounded jaws . The scales and its caudal fin ( tail ) are smaller , similar to that of the Silver and Black Arowana . It is a filter fish which eat mainly plankton , algae and even small fishes . When keep in aquarium , the African Arowana will eat shrimps , fish pellets , bloodworms and other tiny fishes . However , when fully grown , it look more like a catfish than a Arowana .