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How cold is too cold?


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Some fish, typically pond fish like koi or some native cold weather species like sticklebacks and minnows can hibernate under the ice in winter. But you'll need a pretty deep pond (sounds like 3 to 5 feet deep) to give them space below the ice.

Here's an article for how to prepare koi for winter in cold climates, in case that helps give you an idea what they'll need:

https://www.kodamakoifarm.com/winter-koi-pond-preparation-survival/

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What type of fish?  Climate? How deep will the water be?  Above ground or below ground?

 

I live in northeastern Pa.  Near Pittsburgh, Pa.  I have left feeder goldfish outside in a pond only 18-20 inches deep.  Make sure to have a strong current so water doesn’t freeze solid.   I would stop feeding mid August (if I fed at all) and increase the size of the water pump.  
 

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2 hours ago, Dwayne Brown said:

What area do you live in? If you live in maine you cant really keep anything outside in the winter vs florida where almost anything would work. Yes i know these are the extreme but proves a point

I live on west coast my winter low all winter is probably in the high 20s at its lowest and I would say late in winter probably 60s ad the high 

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2 hours ago, Brian said:

What type of fish?  Climate? How deep will the water be?  Above ground or below ground?

 

I live in northeastern Pa.  Near Pittsburgh, Pa.  I have left feeder goldfish outside in a pond only 18-20 inches deep.  Make sure to have a strong current so water doesn’t freeze solid.   I would stop feeding mid August (if I fed at all) and increase the size of the water pump.  
 

I want koi but I don’t know if I could do that in a 150g  above ground 

 

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Well, you said Koi and 150 gallons.   A couple options 

first do you have some place you could bring them in? Maybe some large containers in a garage?

Or explain to pet shop that you want to keep koi.  But in the fall you would be returning them.  Work out a deal, those fish are going to out grow 150 gallons....   so maybe every spring start over?  

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13 hours ago, Angelfishlover said:

I want koi but I don’t know if I could do that in a 150g  above ground 

 

You could do goldfish instead of koi, they would be fine in a 150 gallon however in the winter if your going to keep it above ground you will need to run air and a deicer. If your able to dig into the ground if the 150 was at least 2 feet deep I think you would be okay without a heater if the lows are only in the mid 20's. 

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