Goldfish
The goldfish ("Carassius auratus") is a freshwater fish in the family Cyprinidae of order Cypriniformes. It is one of the most commonly kept aquarium fish.
Comet (goldfish)
The Comet is more active than most other goldfish breeds. It is not unusual to see a Comet dashing back and forth in its tank, racing around in a playful manner. Due to the Comet's hardy and active nature, and the relative ease in caring for them, they are the breed best suited to ponds and outdoor pools. They are often kept with koi in outdoor ponds. Comets have a natural life span of 5 to 14 years and may live even longer in optimum conditions.Goldfish are commonly bred on fish farms in many parts of the world. In most instances, the fish produced are offered for sale to aquarists. However, in North America, there is a demand for goldfish used as bait or "feeder fish" to other fish by anglers. Due to the relatively inexpensive prices of comet goldfish, they may also be used as prizes in carnivals or other places of entertainment. The use of goldfish as bait, feeder fish and carnival prizes is controversial, and animal rights activists have attempted to make the practice illegal, albeit unsuccessfully.