clipped from: webecoist.com 
The Silver Arowana (sometimes spelled “arawana”) is unique because of its large scales, slender shape, large size and short fins. This South American river species has earned another distinction as well: A slight mutation caused one particular arowana to have a glowing white appearance. The price tag for this fish was said to run into the tens of thousands.
This particular cichlid has earned a special place in the world of fish-keeping. If they are kept in a large enough tank, they can grow to an impressive size. Their mannerisms are not unlike those of a puppy: eating food from their keeper’s hand and responding to people on the other side of the aquarium glass. Many fish-keepers claim that an oscar can recognize when the person who feeds them is near the tank.
