Assorted Oscar

(Astronotus occelatus) 

The Tiger Oscar was the first, variant (selectively bred) of the original, Wild Oscar from the Amazon River basin in South America. Tiger Oscars are one of the hardiest and most popular Cichlids in the hobby and have the closest resemblance to Wild Oscars out of all the other, selectively bred Oscar variants.

They are extremely intelligent and can distinguish their owner(s) from strangers as well as associate them with food; they will also develop and display unique and interesting personalities. In addition to their constant "begging" for food, they can also be trained to eat from their owner's hand; which is why they are sometimes referred to as river or water dogs.

Tiger Oscars have a base color of tan to gray with varying black, tan, gray and bright orange markings on their body and fins (although their pectoral fins are usually translucent with no additional colors or markings). They also have a black, ocellus spot at the beginning of their caudal fin which is bordered in a bright orange outline.

https://www.aquariumdomain.com/SpeciesProfiles/NewWorldCichlids/TigerOscar.shtml