How big do goldfish get?


Quick Answer

The Guinness Book of World Records lists the world's largest goldfish in 2013 as being 18.7 inches long. In 2013, a goldfish caught in Lake Tahoe weighed 4.2 pounds and measured 1.5 feet long. Many other cases of goldfish growing to 15 inches long have been recorded.

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Full Answer

Goldfish kept outdoors in ponds tend to grow larger in the summer only. Goldfish kept in heated bodies of water grow continuously. A high-protein diet and abundant food can boost goldfish growth. Goldfish can live up to 45 years with proper care, growing the entire time. Goldfish are a domesticated type of carp.

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