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.
Banded knifefish
The banded knifefish ("Gymnotus carapo") is a species of gymniform knifefish native to a wide range of freshwater habitats in South America. It is the most widespread species of "Gymnotus", but it has frequently been confused with several relatives, including some found outside its range like the Central America "G. maculosus". The English name "banded knifefish" is sometimes used for the entire genus "Gymnotus" instead of only the species "G. carapo".