The oscar ( Astronotus ocellatus ) is a species of fish from the cichlid family known under a variety of common names, including tiger oscar , velvet cichlid , and marble cichlid . In tropical South America, where the species naturally resides, A. ocellatus specimens are often found for sale as a food fish in the local markets. The fish has been introduced to other areas, including India, China, Australia, and the United States. It is considered a popular [aquarium](https://en.wikipedia.org/
wiki/Aquarium) fish in Europe and the U.S.