Wild oscars are the default type of oscar fish. The original species of Astronotus ocellatus is native to the Amazon River ...

Oscar (Astronotus ocellatus), a popular aquarium fish from South America. Oscar (Astronotus ocellatus), a popular aquarium fish from South America. Jón Helgi Jónsson/Wikimedia Commons/CC BY-SA 3 ...

An Asian customer spotted the markings on the astronotus ocellatus at Walker Aquatics in Waterfoot, Rawtenstall, Lancs, and offered to buy it for £10. The customer bought the most expensive tank in ...

and stress response of oscar (Astronotus ocellatus; 5.7 ± 0.8 g). Nine experimental treatments were tested, as follows: Control, Stress28 (EMS in weeks two and eight), Stress27 (EMS in weeks two and ...