Koi Care Basics Blog

One of the most common mistakes people make when designing their first Koi pond is that they plan to build it too small.

The smallest pond I would recommend building is 1500 gallons, which would be approximately 7 feet wide by 8 feet long and 4 feet deep.

This may sound very large to some people, but if you build a pond much smaller than that, you will probably not end up being happy with it.

One of the problems is that Koi fish are extremely addictive and just like with Lay’s potato chips, it is hard to be happy with just a few!

You also need to keep in mind that you may start out with several 6 inch long Koi, but within 3 to 4 years they could grow to be 2 feet long or more.

With very few exceptions, most people end up wishing they had made their first pond bigger.

Bigger isn’t always better though. The largest pond I would recommend building is 15,000 gallons. The dimensions would be approximately 17 feet wide by 21 feet long and 6 feet deep.

A Koi pond design much larger than that can cause you several problems. For example it can become almost impossible to catch one of the fish if you need to.

If it becomes necessary to medicate the pond it will become more expensive the larger your pond gets. In addition, all the water in the pond will need to be filtered at least once every three hours. Operating pumps large enough to get the job done can cost hundreds of dollars per month.

Last, but not least, if you design a pond that is too large you won’t be able to enjoy your Koi as much because the larger the pond the less your fish will be visible.

Make sure to plan your Koi pond design carefully to comfortably accomodate your Koi and please your sense of aesthetics!

You can find more helpful information about Koi pond design in my eBook “Koi Care Basics” found at KoiCareBasics.com

Alan Deacon
KoiCareBasics.com

Although it began in Japan, today Koi breeding takes place all over the world. Many people enjoy Koi ponds and some may even consider trying their hand at Koi breeding.

With that in mind let’s get down to the basics!

The first thing you need to do is to determine the sex of your Koi. This is impossible to do until the fish becomes sexually mature which usually hapens when it gets to 10 inches or longer. Even sexually mature fish can be tricky to sex but in general a male Koi will be less plump than a female Koi because a mature female has filled ovaries that expand her body.

The sexually mature male Koi typically looks more slim and streamlined and often has larger and somewhat more pointed pectoral fins than the female. There are some exceptions to these general rules and it is possible to have a scrawny female or fat male Koi fish.

When Koi breeding season begins the male Koi will develop two white spots on his head and on the first rays of his pectoral fins. The breeding tubercles will look like small white elevated spots and can be hard to recognize. The Koi breeder sometimes becomes alarmed and treats their fish for itch when they notice the small white spots, but with practice soon learns to recognize them.

If you keep your Koi in an outdoor pond they will start to spawn in late spring and early summer as the water temperature begins to rise. A water temperature around 20 degrees Celcius or 68 degrees Fahrenheit is ideal to stimulate Koi breeding.

If you keep a lot of Koi together a so-called flock spawning will occur. A flock spawning will give you an abundance of healthy offspring but breeders try to avoid them because these fish often display less desirable colorations.

Thus, during professional Koi breeding, the fish keeper will select desirable parent fish and place them in their own pond. You will need one female and two to three males for a successful Koi breeding.

If you don’t want to dig a new pond especially for Koi breeding you can use a children’s swimming pool. To increase the chances of spawning you can change the water frequently and lower the water temperature somewhat.

Adult Koi eat live foods such as worms and flies and parents won’t hesitate to eat eggs as well as free swimming offspring in their own pond! During professional Koi breeding when a large survival rate is important the eggs are best placed in their own ponds.

Collecting the eggs will be difficult if you let your fish deposit eggs all over the pond. Most breeders therefore use spawning mops. A spawning mop can be made from frayed nylon ropes or pieces of cotton string that are placed on the surface of the pond.

The breeding fish see the mops as floating plants and will most likely choose them as a breeding site.

During the Koi breeding you will eventually notice that the males are chasing the female. This behavior usually goes on for several days before any eggs are released.

When the females deposit their eggs at the spawning mop the males will immediately go over and fertilize them. The spawning mops can then be removed and placed in a fry raising pond.

As you can see, though it takes some preparation and attention it is not all that difficult to perform a successful Koi breeding.

Alan Deacon
KoiCareBasics.com