Mixing Koi and goldfish - A good idea? | Garden Pond Forums

Quick instructional video on how to change your koi and goldfish pond's water.
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Wow, this is a very informative Hub! I´ve always wanted a goldfish pond but have never had the room. I didn´t realize that by not feeding the goldfish, you can keep the pool properly balanced. I´ve kept goldfish in tanks and they do eat and poop a LOT! I also didn´t realize koi and goldfish can breed but produce hybrid offspring. It makes sense! Thanks for all this great information and the nice photos, too.
Q: What is the difference between a koi pond and a goldfish pond (Landscape feature)?
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Yes, there is a difference. In a water garden the focus is generally on the plants and the overall appearance in the landscape while often keeping a few goldfish as well. With a koi pond the focus is on the koi and proper accommodations should be made. We will now detail each a little more thoroughly. Prazinquantel (brand name Prazi Pond) Effective to treat flukes on goldfish and Koi.
Photo provided by FlickrSimply said: Koi are a lot more work and require bigger/deeper ponds than goldfish...
Photo provided by FlickrMany find a watergarden with plants and goldfish more relaxing and enjoyable than a koi pond....
Photo provided by Flickr
“Water is a unique substance. At about 40 degrees F. it is denser than water warmer or colder, so the 40 degree water settles to the bottom of the pond. It forms a puddle that if left undisturbed will not mix with the colder water above it,” said Rugg. “The ice floating on the top of the pond insulates the water from even colder air above it. Koi and goldfish can safely spend the winter hibernating in the 40 degree water.All the above aside, people do successfully keep them together. Those that do, usually come to the conclusion that they need separate ponds. And catching all the goldfish is nearly impossible. There are many, many people that kick themselves in the butt for introducing goldfish to "age" a pond prior to introducing koi: once you got 'em, ya GOT 'em (kinda like cockroaches, only much prettier ;) )This result is referred to as “winter kill” and occurs commonly in natural ponds and our over-stocked backyard Koi and goldfish ponds are much more susceptible. “Water is a unique substance. At about 40 degrees F. it is denser than water warmer or colder, so the 40 degree water settles to the bottom of the pond. It forms a puddle that if left undisturbed will not mix with the colder water above it,” said Rugg. “The ice floating on the top of the pond insulates the water from even colder air above it. Koi and goldfish can safely spend the winter hibernating in the 40 degree water.Although goldfish and koi carp are sometimes kept together in the same pond, and are related, the two types of fish are actually different species.This result is referred to as “winter kill” and occurs commonly in natural ponds and our over-stocked backyard Koi and goldfish ponds are much more susceptible.