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.
Silver dollar (fish)
Silver dollar is a common name given to a number of species of fishes, mostly in the genus "Metynnis", tropical fish belonging to the Characidae family which are closely related to piranha and pacu. Native to South America, these somewhat round-shaped silver fish are popular with fish-keeping hobbyists.