The common goldfish or by its scientific name Carassius auratus auratus is one of the most popular coldwater fish all over the world. The Goldfish originated in Japan and China. They can live in  very low temperatures and consider being low demanding species but to be honest the goldfish suit to ponds and not to aquariums. There are many goldfish variants including the oranda, the shubunkin,Lionhead ranchu goldfish and more...

The goldfish discovered by Linnaeus in 1758 and now it is very common species. This amasing fish is an omnivore, it will accept flake and pellet foods, also include some vegetable matter and live or frozen foods. The common goldfish requires at least 50 gallon tank size with plenty of swimming room. best kept with other goldfish or large coldwater species due to the fact that it is coldwater fish so do not mix it with tropical fish as it require a less temperature than tropical fish Goldfish are notoriously filthy, producing much waste, frequent water changes and good filtration system is essential. The goldfish is very easy to breed Males are thinner then females and may exhibit breeding spots on their heads and flanks during the spawning season. Gradually increase the temperature to 75 degrees F. Provide soft vegetation or a spawning mop, and excellent water quality. Recommended to remove parents once the eggs are layed, or the eggs will be eaten. A mature pair may produce over 1,000 eggs which hatch after 4-5 days. The fry are easy to feed on small live foods.

More information: Aquariumpassion.com