How to treat koi egg bound, egg bound koi / Egg retention Occasionally, a koi may develop an unusual physical characteristic, such as a swollen abdominal area or a growth on a fin.
These can be caused by a number of factors: some are hereditary, and others are induced by changes in the environment or the presence of a bacterial or viral infection.
If you find a tumor, nine times out of ten it will prove to be harmless. If it is internal, little can be done, other than careful monitoring of the affected koi.
If the growth is external, it may be possible for a veterinarian to remove it surgically, but the chances are that it may return once removed. There is also a risk that the area from which it is removed may become infected.
Generally, the best approach is to leave suspected tumors alone and just monitor the affected fish. Consider taking action only if the koi appears in distress and loses its ability to eat.
Then euthanasia should be considered as the humane option.
A female koi is presumed to be egg-bound when she fails to spawn and the abdomen may be very distended. Female carp-and, therefore, koi – can carry eggs for many years without actually shedding them and it causes them no harm.
Generally, female carp/koi will resorb eggs and use them as a nutrient source during periods of starvation or when as a consequence of illness, they have ceased feeding.
This condition is known as “atresia.” Healthy female carp do not resorb eggs, even in cold periods during the winter. The final maturation and release of eggs for spawning is very rapid and presumed to be due to the release of an enzyme into the ovaries.
Sometimes most of the eggs are shed, but a number remain in the ovary postspawning. Over time, these eggs become encapsulated in fibrous tissue and over a period of years are probably responsible for the tumors and cysts that are common in females of this species.
Females may become egg-or spawn-bound if the eggs have been released into the ovaries and the spawning fish are disturbed, say, by the appearance of a predator. In this situation, if the males stop chasing the females and spawning stops, the eggs are not shed and the females die, presumably through bacterial contamination
Both male and female koi can suffer from a variety of internal swellings and tumors, which appear to deform the body. It is very common for female koi to suffer from cysts and tumors within the ovaries and these do lead to the body becoming visibly swollen.
In order to identify the condition, first, confirm that the fish is female. A koi needs to be around 30 cm(12 in) or longer to sex.
It is possible to identify a female koi by comparing body shape and fin size. Female koi tend to be broader across the shoulders and fuller-bodied, with a cigar shape, whereas male koi tend to be more slender and torpedo-shaped.
The fins on a male koi may be larger and less rounded a the ends. learn more koi fish male and female difference
However, the most reliable method of sexing is to inspect the vent area. A female koi will have a line running from head to tail in the vent area, crossed at one end with another line running from side to side to give the appearance of a T. A male koi will simply have a line running from to tail. Having determined that the koi is female,
gently feel the swollen area: if it is soft to the touch, but not too fluid, it could possibly be unreleased eggs. If the area feels hard, it could still be eggs, but is more likely to be a tumor. However, without invasive surgery, which is normally ineffective, it is impossible to make an exact diagnosis.
How to treat koi egg bound koi Prevention
Just because you have a pond containing male and female koi, it does not mean that the females will spawn. Generally, however, if the environmental and dietary conditions are right, female koi will produce and store eggs each year.
These are generally released during spawning, which takes place when the water temperature reaches 20 degrees Celcius 68 degrees Fahrenheit or higher. Unless you are a koi-breeder, it is best to maintain a constant temperature throughout the winter of around 16 degrees or 61 degrees
In order for koi to spawn, feeding regimes play an important role. In the weeks leading up to spawning, the koi should be offered a high-protein diet to enhance the maturation of both eggs and milt.
Providing there is suitable spawning material, the koi should spawn. In the wild, carp and therefore, koi prefer shallow marginal areas in which to lay their eggs, but most formal koi ponds tend to be deep and steep-sided, following the traditional Japanese style.
Once the water temperature in the pond reaches about 18 degrees celsius 64 degrees Fahrenheit in early summer, it may help to introduce spawning mats or brushes and sometimes this can induce the koi to spawn. learn more about how to breed koi fish
egg bound koi Treatment
As female carp, and therefore koi, can carry their eggs for several years without spawning, the abdomen may become very distended. Even though a koi is extremely healthy, the condition can cause the koi owner great anxiety.
Although these koi usually do spawn eventually, often the reason they fail to do so is that conditions are inappropriate. It has been advocated that female koi that appear egg-bound should be either hand-stripped or given hormones to induce spawning.
It is important to realize that unless the eggs are mature and have been released into the body cavity, any attempt at hand-stripping the koi will only result in internal injury and possible death. If a koi is ready to drop her eggs, applying the gentlest pressure on the abdomen will cause a stream of eggs to be released from the vent.
In this instance, continue gently massaging the abdomen in the direction of head to tail until all the eggs have been released. Although many koi-keepers view pituitary extract or synthetic equivalent hormone injections as the panacea for koi that retain their eggs, these will only have an effect if the female is within 24 hours of spawning naturally.
If a koi is genuinely egg bound where spawning has been interrupted and the males have lost interest and are no longer inducing the female to shed her eggs then hand stripping should be undertaken right away, Once the eggs have been released from the ovaries and the koi does not spawn, peritonitis set in as the eggs disintegrate and the female will die within a few days
How to treat koi egg bound
How do I know if my koi is egg bound?
If you have females, it’s easy to tell if they have eggs – large bulging area, lower abdomin around the vent. If they don’t spawn or release the eggs usually they absorb them over winter. So I would say, don’t feed an egg bound female.
How does a pregnant koi look like?
Females will typically be larger than males and have rounder, more translucent fins. They also tend to have a wider build. As they produce eggs, their bodies will appear increasingly swollen, as their reproductive organs make room for thousands of eggs
Why is my koi bloated?
If a koi has advanced dropsy, it is very noticeable and recognizable as the fluid inside the koi’s body will cause it to swell and bloat. As the body swells more and more, the scales will develop gaps between them which will make them lift away from the body of the koi.
How long do koi fish hold their eggs?
In water temperatures around 20 C / 68 F, the koi will hatch in about 3-4 days. When they hatch, the juveniles are about 7 mm long and will feed from their yolk sac for few days until they are more developed and can eat food found in the water. These baby koi hatched in 4 days.