In ponds, catfish will be more likely to stay very close to the deeper parts of the pond.
Plenty. There are several catfish species common to U.S. ponds -- channel catfish, blue catfish, yellow cats, white cats, bullheads -- and each fills a slightly different niche in a pond environment. All told, the family Ictaluridae boasts 24 known species in north America Channel catfish can live in both fresh and salt water and brackish water yet they are generally found in freshwater environments. Channel catfish are found in many bodies of water such as lakes, reservoirs and ponds and also in areas of moving water such as streams, creeks and rivers. Channel catfish are native to the Neartic range, from lower Canada and throughout the midwest of the United States. Channel catfish have been introduced in the Palearctic in Cyprus, the Czech Republic, Romania, Slovakia, and Spain as well as Malaysia. As a pond pro part of my job is to give advice that even I may not want to live by and that includes the advice I give about keeping catfish in your backyard koi pond or water garden installation. However; before I give my angle on catfish, we need to narrow down which type of catfish I am referring to. The channel catfish is rarely bought for the purpose of adding beauty to the pond because they don’t have great coloring, typically grey or “gold”. They also hide most of the time only coming out for feedings. And they will not create better water quality or reduce waste in your pond. For those that are enthusiasts of the keeping the channel cat in the backyard pond or water garden there are many good points to this fish 3. Put your bait on the bottom of the pond. In ponds, catfish will be more likely to stay very close to the deeper parts of the pond. You need to get your bait as close to the bottom as you possibly can. If putting your line down deep doesn't work, try to place you line in other cool dark places. These places may be in or around: The flathead catfish eats live food, while the channel cat(pond stockers) eats mostly on the bottom, & can eat the eggs of other fish, but..... I've had channel cats, bluegill, bass, & crappie thriving together in the same pond for 14 years now. I'm not really Royalty,....... just a Royal pain in the...... The catfish should be fine in a pond that size and depth. They will hang out in the deeper parts and eat some garbage type things that the other fish won't eat. And by garbage I don't mean anything bad. When it comes to catfish in your backyard pond we are not really stocking either of those extremes, but typically the catfish that go into our ponds and water gardens can get very large, very quickly; sometimes up to 10lbs! In the wild the channel cat can get up to 40+ lbs. The channel catfish is rarely bought for the purpose of adding beauty to the pond because they don’t have great coloring, typically grey or “gold”. They also hide most of the time only coming out for feedings. And they will not create better water quality or reduce waste in your pond. For those that are enthusiasts of the keeping the channel cat in the backyard pond or water garden there are many good points to this fish Highly adaptable, catfish are found in a wider range of habitats than most other freshwater fish. They are generally warmwater fish that live in ponds, lakes, or quiet, slow moving streams and rivers, but they are also present in many cool Adirondack lakes.  Many small ponds are managed exclusively for channel catfish. A small, well-managed pond can produce 300 to 500 pounds of catfish per surface acre each year, providing many hours of recreation and an abundance of high quality food for the table. 
http://www.bassresource.com/fish_biology/catfish_stocking.html http://www.biokids.umich.edu/critters/Ictalurus_punctatus/ http://fullserviceaquatics.com/koi-pond/catfish-in-your-backyard-pond-friend-or-foe/ http://www.wikihow.com/Catch-a-Pond-Catfish http://www.backyardchickens.com/t/526132/stocking-catfish-in-pond-good-or-bad-idea http://fullserviceaquatics.com/koi-pond/catfish-in-your-backyard-pond-friend-or-foe/ http://www.dec.ny.gov/animals/7046.html http://mdc.mo.gov/sites/default/files/resources/2011/05/catfishfarmponds_2013.pdf
where do catfish live in ponds