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KOI INFORMATION

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Koi Diseases

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White spot (Ich)

White spot (Ich)

Koi Diseases

Caused by Ichthyopthirius multifiliis. The white spots on the skin, gills and fins are individual protozoan cells that are under the skin and feed on the body fluids and cells. They then punch out of the skin and fall to the bottom of the pond, collect together and begin breeding, the offspring then re-invest the fish.

As well as white spots symptoms are scratching and swimming into the water inlet, failure to feed and lethargy. It is fatal if untreated. Fortunately commercial white spot remedies are widely available.

More Koi Diseases ↓

Anchor worm

Anchor worm

in the gills of Koi, when they mature they mate and the male leaves the Koi, the fertilized female settles on the body of the Koi and continues to grow, becoming the familiar worm...
Cotton Wool Disease

Cotton Wool Disease

Another bacterial infection. The common name comes from the white tufts that develop around the mouth and spread to the body and fins, often leading to ulcers and a thin appearance....
Dropsy

Dropsy

Raised scales (rather like a pine cone) and eyes standing out from the head. A sign of a number of conditions, may be congenital heart or kidney failure or an internal bacterial...
Fin rot and ulcers

Fin rot and ulcers

A number of bacteria are associated with fin rot, lesions and internal hemorrhaging, notably Aeromonas and Pseudomonas. Ulcers usually start at the site of an injury, the bacteria then...
Fish Lice

Fish Lice

Argulus another crustacean parasite, round and up to 1cm wide. They have a sucker to hold on to the Koi with needle-like mouth parts which they stick into the Koi and inject a toxin....
Gill maggots

Gill maggots

Gill maggots are the mature females of the parasitic crustacean Ergasilus. Heavy infestations can cause severe damage, eroding the gill filaments and allowing secondary infections to...
Saprolegnia fungus

Saprolegnia fungus

One of the most common fungal infections of Koi. The fungal spores will grow anywhere on the Koi, including the gills, initially germinating on dead tissue. Their threadlike hyphae...
Skin and gill flukes

Skin and gill flukes

These are the fish equivalent of fleas. They are two different types of flukes, but despite of their names both can be found on the body and the gills, feeding on mucus. They use...

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