How Big Do Goldfish Get? Growth Rate For Different TypesPopular on CamTrader
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| Updated:July 28, 2020
How big do goldfish get? Well, according to the Guinness Book of World Records, the longest pet goldfish recorded to date came from the Netherlands and measured a whopping 18.7 inches in length! Although that size is unusually large, goldfish do grow pretty big if they’re kept in the correct environment and fed a balanced, high-quality diet.
So, how fast do goldfish grow? That depends on a number of factors, and if you want to find out how to grow a really large goldfish in record-breaking time, then you need to read this fascinating article!
Table of Contents
The Biggest Goldfish In The World
The world’s largest goldfish that was actually weighed came from the U.K. and weighed in at over two pounds! Goldie, as the fish was imaginatively named by his owner, lived for 15 years and grew to be five inches tall and just under 15.5 inches in length. Despite being kept in a small tank, Goldie’s impressive size can be attributed in part to the excellent care and diet provided for him by his doting owner.
In Holland, another pet goldfish made it into the Guinness Book of World Records, measuring an amazing 18.7 inches in length. Although the fish was never put on the scales, its weight was estimated at around three pounds.
Why Do They Get So Big?
In the case of these two record-breaking fish, it seems most likely that their impressive size was partly down to the care they received as pets.
Water quality is also extremely influential when it comes to goldfish growth. If water quality is poor, the fishes’ growth will be stunted, and they may even develop physical deformities as a result. Also, a nutritious diet and ample food will be influential.
Average Weight Of A Goldfish
The weight of a goldfish depends on the variety of goldfish and its age. However, on average, a regular pet goldfish weighs around eight ounces. When it comes to length, fancy goldies with their characteristic egg-shaped bodies generally grow to around eight inches in length, while single-tail goldfish can reach between ten and 12 inches long.
So, you can see that the world record-breaking fish of the U.K. and the Netherlands were exceptional specimens, rather than the norm.
Goldfish Growth Rate
Goldfish grow around one inch per year, growing most rapidly during their first few months of life. Unlike most other common pets, goldies keep growing throughout their lives. Goldfish don’t grow in spurts, depending on their environment and other factors. For example, a goldfish that lives in an outdoor pond will grow more during the spring and summer when the water is warmer, growing less during the winter months when the temperature drops.
How Big Can Goldfish Get In The Wild vs. In A Tank?
Modern goldfish are generally thought to be descended from wild Prussian carp and Crucian carp that originally came from Central Asia, although these fish are now found in Europe, Asia, and North America. Goldfish belong to the Cyprinidae family of fishes, together with common carp and minnows.
Prussian carp grow to an average of 18 inches in length, weighing around 6.6 pounds. The species’ usual color is silver, but they are found in other morphs, including orange and gold, which leads to them being mistaken for pet goldfish that have been released into the wild, having outgrown their tanks.
Strictly speaking, there are no wild goldfish. If you ever see a fantail or a comet swimming around in your local lake, it’s a pet fish that’s been released into the wild.
So, if your pet gets too big for his tank, should you turn him loose in your local pond or river?
Absolutely not! Firstly, goldfish are regarded as an invasive, alien species that could have a negative impact on the ecosystem into which they are released. Secondly, it’s unlikely that a pet goldfish would survive for long in the wild, as it would most likely fall prey to larger predatory fish, such as pike or bass.