By providing plenty of plants like hornwort, water hyacinths or water lettuce or even artificial spawning mops or ropes, you can provide an ideal breeding habitat for them. The video below shows koi that have been spawning in the shallow stream at the base of a waterfall. Most of the eggs deposited were deposited in the water cress. Notice the foam at the bottom of the waterfall, that is a sure sign that fish have been spawning in the pond.
The opaque sphere on the right is a koi egg one day after spawning. Eggs will stick to whatever they land on once released by the female, in this case on root of a water hyacinth. Depending on water temperature, the eggs usually hatch in 3 — 5 days.
The fish are now feeding on finely ground flake food. You can see the swim bladder and digestive tract as their bodies are still transparent with a yellow colour. The opaque spheres on the right are koi eggs one day after spawning. If you keep koi then you may be keen to discover when they might begin to mate. Like people, fish can reach sexual maturity at different ages and their age can be difficult to determine.
It is hard to know how old your fish are unless you obtained them shortly after birth. Most koi will be at least one year old before they are sold. This is partly because it may take several months for them to be chosen by a new owner and offered their forever pond.
You cant base your estimate of age on the date that your purchased the koi as the information you were given may not have been accurate. To make matters worse, you cant estimate the age of a fish based on its size.
Koi vary in size naturally and their rate of growth will be influenced by their diet. You could encounter a large fish which is quite young or an older fish which is reasonably small. Breeders and specialist vets would be able to help you. There are indicators of age but you will need the benefit of experience to interpret them. The best way to tell the age of a koi is by checking its ear bone!
It's also helpful to add pond salt to the water to keep fish stress down and help prevent diseases. If you want to learn more, read our article on the benefits of using salt in koi ponds.
Newly hatched fry can't swim and will need a protected area that's safe from natural predators like tadpoles, frogs, and other koi. Make sure you give them plenty of coverage with water hyacinth , water lettuce , and other floating pond plants.
You might also consider using a fine mesh tent, like the Nycon Fish Spawning Incubator , to protect them and prevent them from becoming trapped in your filtration system. As your new additions begin to grow, there will be added ammonia and nitrates in the pond. If you plan to keep these new koi, make sure you're providing adequate filtration in your pond and aren't deviating from a practical fish load based on your pond size. Having more fish in your pond than your filtration system can handle can lead to more severe algae blooms and muck accumulation.
To combat this, keep adding beneficial bacteria like Nature's Defense or Muck Defense to break this waste down. With a little staging and encouragement, koi fish breeding becomes a lot easier. Try implementing some of these steps this season to take your koi spawning efforts to the next level! If you have any questions along the way, our customer service team will be happy to help.
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