Goldfish is one of the most commonly kept aquarium fish. A relatively small member of the carp family the goldfish is a domesticated version of a dark-gray/olive/brown carp native to east Asia. Goldfish that have constant visual contact with humans also seem to stop associating them as a threat. After being kept in a tank for several weeks, it becomes possible to “pet” a goldfish on the head, feed it by hand, or even cup a hand around it without it reacting in a frightened manner.
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