Goldfish size

Brizburk

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• Oct 24, 2026

• #1

A few years ago I decided to get a pond and some pond fish. I bought a few goldfish from the feeder fish tank. I overwinter them in a 75 gallon tank. Last winter the tank size seemed fine. This year one of the fish has grown quite a bit. I am considering up sizing to a larger tank but my question is, how big will this fish get? It's about three times the size of the other two. At 3 years old are they done growing?

 

A201

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• Oct 24, 2026

• #2

Depending on the particular genetics of the big gold fish, it could grow up to a foot long.

 

OP

Brizburk

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• Oct 24, 2026

• Thread Starter
• #3

Depending on the particular genetics of the big gold fish, it could grow up to a foot long.

Click to expand...

Wow! Any idea of how long it can take to reach that size? If it does.

 

A201

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• Oct 25, 2026

• #4

I'm not sure. A lot depends on nutrition, the spaciousness of the pond or tank & genetics.

I would think no more than two to three yearrs to reach the majority of maximum size.

 

ProudPapa

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• Oct 26, 2026

• #5

According to Google, your winters are pretty mild, so you might consider leaving them in the pond. They are not tropical fish, and don't need warm water.

I keep goldfish in cattle troughs to control algae and mosquito larva, and I leave them in year-round. Here where I live we occasionally get temperatures down into the 20's, and the fish are fine under a layer of ice for a few days (back when I had tubs outside my shrimp were fine all winter also).

 

R

RayClem

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• Oct 26, 2026

• #6

If you live in an area where the temperature is below freezing for weeks on end, you might need to get a heater to keep a small area of your pond free of ice. As long as the pond is deep enough to avoid freezing solid, you should be fine.