Fantail Goldfish in Aquarium.

- Image ID: BJNM64
Fantail Goldfish in Aquarium.
Stephen Emerson / Alamy Stock Photo
Image ID: BJNM64
The goldfish (Carassius auratus auratus) is a freshwater fish in the family Cyprinidae of order Cypriniformes. It was one of the earliest fish to be domesticated, and is one of the most commonly kept aquarium fish.