The goldfish, Carassius auratus, was one of the earliest fish to be domesticated, and is still one of the most usually kept aquarium fish and water gardens. A comparatively small member of the carp family ,which also includes the koi carp and the crucian carp, the goldfish is a domesticated version of a dark-gray/brown carp native to East Asia that was introduced to Europe in the late 17th century. The mutation that gave rise to the goldfish is also known from other cyprinid species, such as common carp and tench. Goldfish may grow to a maximum length of 23 inches (59 cm) and a maximum weight of 9.9 pounds (4.5 kg), although this is rare; few goldfish reach even half this size. In optimal conditions, goldfish may live more than 20 years (the world record is 49 years), but most household goldfish generally live only six to eight years, due to being kept in bowls.A group of goldfish is known as a troubling.

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