Goldfish (Carassius auratus) was one of the first domesticated fish and to this day remains one of the most popular for keeping in aquariums and water gardens. A relatively small representative of the carp family, the golden Fish is a domesticated version of a goldfish, which was brought to Europe in the seventeenth century, as a result of work of Chinese breeders. The maximum size of a goldfish – 59 cm., Maximum weight – 4.5 kg. Record lifespan of goldfish is 49 years, although it usually lives up to 20 years, and in the aquarium maintenance of six to eight years. During the reign of the Chinese Tang dynasty was very popular to raise carp ponds. As a result, mutations appear golden carp, as it is rare, it soon became a more coveted than the silver species. Ancestors of goldfish contain not in containers and in the ponds.
But since the early Sung dynasty, people outside the royal family have banned cultivation of goldfish. The presence of other colors of goldfish was found only in 1276, the first vualehvostaya fish appeared during the Ming Dynasty, and in 1502 the goldfish arrived in Japan. In 1611, the fish travels through Portugal to Europe, and in 1850 gets in America. Goldfish are usually classified as a cold-water, it can live in unheated aquarium. Like all karpoobraznye goldfish produces large amounts of waste. She has a small digestive tract and it can not absorb the excess carbohydrates. If time does not clean the aquarium from such wastes, it can lead to premature death of fish.