Having a fish might be a cheaper alternative if you’re referring to a Beta or Feeder but when it comes to one that’s a rare breed and suffers from an extremely rare condition, it makes it the most expensive fish in the world.
The fish is a platinum arowana and it is 15 inches long. It lives in Singapore, where it is owned by Aro Dynasty, a dragon fish breeder. It’s rare condition causes it’s right eye to pull downward which apparently is not rare for the arowana breed.
However, the pure white color of this particular fish is rare, even amongst its own kind, and is considered a mutation. The fish was displayed and gained international attention at the Aquarama show in 2007. Shortly after the show, Aro Dynasty received an offer of $80,000 for the fish and after declining, they received another offer of about $400,000 USD. Turning that offer down as well, Aro Dynasty still maintains that the fish is not for sale. Regardless of a buyer, this rare fish is still considered to be the most expensive fish in the world.