Oscar ("Astronotus ocellatus") is a species of fish from the cichlid family. Oscars have many common names. Some of these names are oscar, tiger oscar, velvet cichlid, and marble cichlid. The scientific name for the oscar species is "A. ocellatus." Oscars can grow up to long and weigh over . The Oscar fish is a smart species of fish. Oscars are popular as aquarium fish. Oscars are also very aggressive. 