Astronotus ocellatus

Astronotus ocellatus, or the Oscar fish, is a popular freshwater fish known for its intelligence and personality. They are large, territorial, and can be aggressive, especially when under stress or when breeding. Oscars are known for their ability to recognize their owners and may even allow hand feeding. They require a significant amount of tank space due to their size and active nature. It's essential to have a sturdy lid, as Oscars are known to jump. Oscar fish are also sensitive to water quality fluctuations, so regular maintenance is crucial.