Gold fish is a very familiar foreign bullion fish. Goldfish does not have the pair. It's the world's most nomadic species of fish. Its color is as golden. This fish is usually small size. People usually keep goldfish in house anchorage at the hobby. But if goldfish are released in the natural environment, it can be as big as football. Aquariums are very easy to care for at home. Goldfish is one of the 4000 species of aquarium fish and 1400 species of saltwater.