The Silver Arowana, or Arahuana, is known by many alternate names, sometimes making identification tricky. Scientifically, it is most often called Osteoglossum bicirrhosum, but one may also hear reference to O. vandelli, or Ischnosoma bicirrhosum. Among the group known as band fishes, the Silver Arowana is considered a true bony fish. Indigenous to the flood plains of the Amazon River Basin in South America, the Arowana can reach an intimidating 47 inches in the wild, and is often too much for all but the advanced freshwater aquarist to manage. It can survive short times out of the water breathing air by utilizing its swim bladder.The Silver Arowana prefers a 250-gallon tank with a fine gravel bottom, loosely planted, and soft, peaty water with lots of open space above for swimming. The aquarium must be fitted with a tight, heavy cover because the Arowana will jump, particularly when after prey.