Koi diseases - recognize and treat


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Kois are great fish. They are getting big and look great from the drawing. Their housing conditions are not easy and unfortunately the animals are afflicted by numerous diseases.
In addition to the relatively high purchase price, Koi often incurs considerable animal husbandry costs on the owner. A distinction is made between parasitic and bacterial diseases, as well as fungal and viral diseases.
parasites... can be recognized by the fact that the animals suffer frugality, rub themselves and jump, get sunken eyes, pinch fins, make strong gills or sit on the ground and attract attention by apathetic or terrible behavior. One distinguishes between two groups of parasites:

  • Mehrzeller such as anchor worms and carp lice can be seen with the naked eye on Koi.
  • Protozoa are often recognized by white spots or a milky surface. They are better to see and distinguish under the microscope.
If the infestation with the parasites is not detected in time, this often leads to death. Parasites are often introduced by the weather or by animals such as birds. Sometimes the pathogens are already present in the water. Stress can also lead to an infestation. In general, it is important to ensure good water quality. This reduces the risk of parasite infestation.
Bacterial diseases in Kois
To distinguish are wounds and ulcers, fin and mouth rot, ascites / dandruff and others. Bacteria are found in every water and every koi. If the conditions are ideal for them, they multiply explosively. A small wound can lead to death, will not intervene quickly.
  • Again, a good water quality is crucial that the diseases do not occur. Important is a pond filter that is powerful enough to keep the water clean.
  • Open wounds, holes and ulcers can often be seen well. The wound is usually bloody and also infectious. This is caused by unicellular organisms, poor water quality and increased germ density. The remedy is to get the koi quarantined and treated with antibiotics.

  • The fin / mouth rots show wrinkled fins and there are inflamed areas that can be bloody. The infection can be fatal. The koi is isolated and treated with antibiotics. Triggers are often bad housing conditions. Illness only curable in the initial stage.
  • The ascites / dandruff can be recognized by protruding scales, goggle eyes, a total swollen body, apathy and frugality. Later, the fish decay in a supine position. They are breathing heavily. The disease is almost always fatal. The koi must be isolated and treated with antibiotics.
fungal disease
The two main fungal diseases are gill necrosis / rot and mold (fungal infestation). The pathogens are found almost everywhere in the water.
  • The Kiemennekrose (Dying gill tissue) is indicated by markedly increased breathing, gill swelling, mucus formation on the gills and a brown to yellow fungal infection on the gills. The koi is isolated and treated with antibiotics. The disease progresses very quickly and often ends fatally. It is best recognized by the fast breathing. Cause are algae fungi. Good housing conditions prevent their occurrence.

  • fungal infection can be seen on cotton ball-like coverings on injured mucous membranes, wounds and holes. There are several treatment options. It is beneficial to isolate the Koi. Malachite green, formalin sabbactisun and antibiotics help. Healthy fish are hardly affected. Often a small injury that the molds settle will suffice. They multiply and infest the whole body. Then that usually means the death of the animal.
Viral diseases in Kois
In the case of viral diseases, a distinction is mainly between the Karpenpocke (KhV1) and KHV4 (Koi herpes virus).
  • at carp pox one recognizes spongy, waxy growths, often on the fins. The disease occurs mainly in spring and autumn, with falling temperatures. As the water warms up, the symptoms disappear. The altered sites are contagious. It is a herpes virus. Often it comes through bad housing conditions to the outbreak of infection. The growths deface the koi, but are not deadly. They treat with fish mineral from Sökk and use short-term baths with table salt.

  • KHV 4 is another infection caused by a herpes virus, which can be seen in a lack of appetite, excessive mucus production, mucus, orientation problems, sunken eyes and dead tissue. This disease occurs in the summer. The temperature should be raised to 30° C and kept for two weeks. It is treated with chloramine T, acriflavine and copper sulfate. The death rate is very high. There is a vaccine that is not approved in Germany.
ConclusionRecognizing the above diseases is one thing.If you want to play it safe, you should still consult a specialist, in the special case a veterinarian who knows Koi carp!

Video Board: 5 Common Fish Diseases And How To Spot And Treat Them.

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