The Arowana is the world's most costly aquarium fish. It is a tropical freshwater fish from the brackish swamps of Asia, the river basins of South America, and the pools and billabongs of Austrailia. There are numerous types of Arowanas, most of which can easily grow up to three feet long.

This fish is a savage predator that’s been around since the age of the dinosaurs and has remained unchanged, which is why some people call these fish “living fossils.” The Arowana is prized for its unique metallic scales; the bristles that bulge from its jaw; and its...