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Goldfish
From Wikipedia, the free encyclopedia.

For the Pepperidge Farm brand of snack crackers marketed in North America, see Goldfish (snack).
The goldfish (Carassius auratus auratus) was one of the earliest fish to be domesticated, and is still one of the most commonly-kept aquarium fish. A relatively small member of the carp family (which also includes the koi and the Crucian carp), the goldfish is a domesticated version of a dark-gray carp native to East Asia (first domesticated in China) that was introduced to Europe in the late 17th century. It may grow to a maximum length of 23 inches (59.0 cm) and a maximum weight of 6.6 lb (3.0 kg), although this is rare: most individuals grow to under half this size.

Goldfish natively live in rivers, lakes, and other slow or still moving bodies of water in depths up to 20 m (65.6 ft. They natively live in a subtropical climate and prefer freshwater with a 6.0 - 8.0 pH, a water hardness of 5.0 - 19.0 dGH, a