Large female Koi fishes can lay approximately 300,000 eggs in a single go. If you want to breed Koi fish successfully, it is important that you are familiar with all the important facts about this type of fish. For one, you should know when the perfect time for breeding is. Koi fish can be bred between April and July. Then again, you have to make sure that you have a high quality and healthy Koi in order to breed properly. If you have a collection of Koi fishes, choose the ones that are in best shapes, proportions, moving strongly, look attractive and of course, the ones that looks normal and with no diseases. You should also pick the Koi according to the pattern of your choice.
Age and Size
When breeding, your fish should be at least 10 inches in length. An ideal male Koi fish for breeding is at 3 to 5 years of age while the female should be between 4 and 5 years old. Take note that this is important, as the age of the fishes can affect the quality of their eggshells. Younger females normally produce eggs with shells that are thinner, meaning it is more fragile and will less likely survive. If the female Koi is too old, on the other hand, the eggshell can be too tough and the sperm will not be able to penetrate it. Male Koi fishes that are ready for spawning have well developed breeding tubes on their pectoral fins and head.
A separate tank is necessary for breeding. The quality of the water should be high and with optimum temperature. It is also important that you have a place where the eggs will be laid, such as branches or grasses. This will serve as a private area once the eggs are hatched as well. The perfect breeding combination is one female and two male Koi fishes. After the eggs are laid, the fishes should be removed from the pond and the pond should be treated with malachite green in order to prevent the accumulation of fungus.
In order for the eggs to hatch, the water temperature should be at 23 degrees centigrade or 73.4 degrees Fahrenheit. These hatchlings will look for a private spot like branches, grasses of pond wall so make sure to provide one. Baby Koi fishes should only be feed after 3 to 4 days and some of the great choices are brine shrimp or hardboiled egg yolk. If you have the money for it, you can also buy foods for the fry from fish stores. You would know if the baby Koi fishes are ready to eat once you see them swimming around or grouping together. Four days after hatching you can now remove the breeding material to get rid of all the unhatched eggs, thus lowering the level of ammonia in the water.
After 3 to 4 Weeks
Once the fry reached three to four weeks, you can now move them to an aquarium, pond or tank. Larger fry might eat the smaller or weaker ones so you better watch carefully or split them in separate tanks. Your Koi fishes will grow faster if you are feeding them properly but make sure that you do not overfeed, as it could cause them to lose their color. Once your Koi has grown to 7 to 8 inches, you can introduce them into your main pond along with the rest of your Koi fishes. If you can follow these breeding tips, you can successfully breed Koi fishes and you can even gain profit from it. For even more information, check out the Koi Farm Guide.