The oscar fish is a good choice for aquariums. It is a large cichlid fish that can grow to 12 inches long. The oscar is considered unusually intelligent and seems to bond with its owners; some even seem to like being petted. However, the fish can be aggressive toward others.
The oscar has a deep, compressed oval shaped body, and the color can vary according to sex, size, age and even mood. The fish can live up to 10 years. Because the oscar is such a large fish, it needs a tank of at least 100 gallons. The water temperature should range between 72 and 77 degrees Fahrenheit.