Aquarium fish

Aquarium fish are fish used in aquariums. They can be freshwater or saltwater. Some fish, such as the betta, can be aggressive.

 List of aquarium fish 

 Freshwater 

 Goldfish 
The goldfish (Carassius auratus) is a freshwater ray-finned fish in the family Cyprinidae of the order Cypriniformes. It is a great fish for aquariums, and is one of the most popular aquarium fish. They have become an invasive pest in parts of North America. The average lifetime of a goldfish is ten to fifteen years.

 Pike topminnow 
The pike topminnow (Belonesox belizanus) is sometimes found in the aquarium trade, but it isn't an easy aquarium resident.

 Green swordtail 
The green swordtail (Xiphophorus helleri) is a freshwater aquarium fish in the family Poeciliidae of the order Cyprinodontiformes. Green swordtails are very popular in aquariums.

 Pygmy sunfish 
Elassoma, the pygmy sunfishes, are popular as aquarium fish because of the males' iridescent colors and fascinating breeding behaviors.