what fish can I put in a 1000g pond in OH climate and keep there all year?
That all depends on what you want to do with the pond and how much you are investing in it.
Heat pumps, good filter/pump and possible a cover of some kind will allow you to keep fish in there year round, pretty much any outdoor fish you want to. If you don't invest in a good pump/filter and heater then very few fish if any fish will live in there year round.
If you put a building over it, then anything is possible if the building is heated.
If the pond is deep enough then some fish may survive in there as long as it doesn't freeze completely and you can keep some of it open at the surface for oxygen exchange.
We already have a good filter, we are gonna put a heater in when winter comes around so the top doesn't completely freeze over for aeration, and it is about 4- 4 1/2 feet deep so anything that can survive this would be what I'm looking for. How would koi handle this? what kind of catfish would survive this? These are kinda the lines my dad wants to go.
From my understanding of Koi, they don't do well in cold temps. Standard Goldfish one of the other slightly fancier ones are supposed to overwinter well in cold ponds. As for catfish, I don't know of any other than the wild type. Maybe Yellow or Brown Bullhead but they are big fish eater so large fish would be needed to keep them from eating them.
Hopefully someone else with some actual experience with Koi, catfish and other goldfish will post so you have more reliable information than my read it on the internet info.
One koi should be fine, many people have koi in cold areas. Your pond is the perfect depth for koi. However, koi need a minimum of 1000 gallons each, as they grow to be three feet long. It is a myth that they will only grow as large as the tank/pond they are in will allow. There are many varieties of beautiful goldfish though, and they grow no longer than about 12". Just be sure to keep a floating heater on the surface so gases can escape through the opening. Trapped gases under ice are lethal to koi and goldfish. And of course you will need a pump and filter year-round.
so is it onl koi that you can use in ponds. no other freshwater fish???[/u]
No, there are many varieties of goldfish that are great for ponds. I have Comets and Sarrasas goldfish in mine. Another hardy goldfish good for ponds is Shubunkins. The goldfish I mentioned grow to about 12" in length, whereas Koi grow up to 3 feet. It is a myth that fish will only grow as large as their tank/pond will allow them to grow, so Koi are better suited for ponds well over 1000 gallons. Koi and goldfish are not the same fish, they are different.
If you have a really tiny pond, you could instead get mosquito fish, which are similar to guppies in size and look.
Do you have a pond, or are considering one? :D
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