Oscars are a cichlid from south America on the amazon river, they can live ten to twenty years in an aquarium. At adult hood they can reach a length of fourteen to eighteen inches in some cases larger (keep this in mind when considering a fish for your aquarium), and weigh around three pounds. Feeding them a diet of good quality flake and pellets, with an assortment of crickets or mealworms is very health for this fish. They eat live insects in the wild which makes up for most of their diet. The Oscar is known to recognize their owners and are very intelligent fish.