Diseases that usually attack Koi fish

Koi fish are one type of ornamental fish that are very popular among aquarium and pond lovers. With bright colors and beautiful movements, koi fish are not only a symbol of good luck and peace, but also the main attraction in pond decoration. However, to maintain the health of koi fish, pond owners need to know the various diseases that can attack them. Generally, diseases in koi fish are caused by parasitic, bacterial, or worm infections. When this happens, the fish will appear lethargic, then white spots will appear on its skin. It should be noted that healthy koi are active and have bright colors. The following are several types of diseases that commonly attack koi fish.

• Aeromoniasis: This is a disease that is often found in all stages of koi fish. This disease is caused by the bacteria Aeromonas hydrophyla which shows clinical symptoms in the form of red spots (haemmorhagi) on the surface of the fish and the fish tends to be passive.
• Pop Eye: Pop Eye or has another term Exophthalmia is a disease experienced by koi fish and is caused by tuberculosis bacteria. Koi fish with symptoms of Pop Eye disease will experience swelling in the eyeballs that appear bulging or protruding.
• Koi Herpes Virus: Koi Herpes Virus or abbreviated as KHV is a disease caused by the Cyprinid Herpesvirus 1 (CyHV-1) virus. Symptoms of this disease are characterized by gill damage, excess mucus production, sunken eyes, and blisters.
• Gill Flukes and Skin Flukes: This disease is a symptom caused by ectoparasites, namely Dactylogyrus spp and Gyrodactylus spp. This parasite will attack the gills and skin of the fish, causing loss of appetite.

• Blood Brown: Blood Brown can occur in koi fish due to nitrite (NO2) poisoning containing more than 0.25 ppm in the pond. This causes the fish’s skin to become dull and causes a red rash around its body.
• Blood Brown: Blood Brown can occur in koi fish due to nitrite (NO2) poisoning containing more than 0.25 ppm in the pond. This causes the fish’s skin to become dull and causes a red rash around its body.
• Fungus: Fungus can attack koi fish until they experience injuries due to poor pond conditions. Koi fish infected with bacteria can also make it easier for fungus to grow around the surface of their bodies.
• Cotton Mouth Disease: Cotton Mouth Disease, also known as Columnaris Disease or Cotton Wool Disease, is a disease caused by Columnaris bacteria. Infected koi fish will be covered in white cotton threads or clumps around their mouths.
• Dropsy: Dropsy is a disease that makes fish look bloated with raised scale surfaces.

Don’t forget to examine the symptoms of koi in each disease, so that you can provide the right help. Hopefully all koi hobbyists at home are always healthy 🙂