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Koi Parasites and Treatments

Koi Parasites and Treatments

Identification of Koi parasites. Most koi parasites are not visible to the naked eye. In order to correctly identify any koi parasites you... (click on image for more details)
White Spot (Ich)

White Spot (Ich)

Caused by Ichthyopthirius multifiliis. The white spots on the skin, gills and fins are individual protozoan cells that are under the skin and... (click on image for more details)
Trichodina

Trichodina

Trichodina is one of the easiest protozoan parasites to detect under the microscope as it is almost perfectly round with hundreds of hooks... (click on image for more details)
Skin and Gill Flukes

Skin and Gill Flukes

Gill and Skin flukes are two of the family of monogenetic trematode genera, all of which are characterised by the large grappling hooks which... (click on image for more details)
Costia

Costia

Ichthyobodo necator (Costia) This koi parasite is extreamly small (10-20 microns long) and a magnification of 100 times is the absolute... (click on image for more details)
Chilodonella

Chilodonella

Chilodonella cyprini. Chilodonella is another protozoan parasite which effects the skin and gills of koi.This koi parasite is typically... (click on image for more details)
Anchor Worm

Anchor Worm

Lernea (Anchor Worm). This koi parasite is most commonly found on newly imported koi, and should be dealt with by your koi dealer, it is... (click on image for more details)
Fish Lice (Argulus)

Fish Lice (Argulus)

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... (click on image for more details)
Dropsy

Dropsy

Raised scales (rather like a pine cone) and eyes standing out from the head. Dropsy itself is not a disease, but rather a result of some... (click on image for more details)
Cotton Wool Disease

Cotton Wool Disease

Columnaris (Flexibacter columnaris) or Cotton Wool Disease is another bacterial infection. The common name comes from the white tufts that... (click on image for more details)
Finrot and Ulcers

Finrot and Ulcers

A number of bacteria are associated with finrot, lesions and internal hemorrhaging, notably Aeromonas and Pseudomonas. Ulcers usually start at... (click on image for more details)
Gill Maggots

Gill Maggots

Gill maggots are the mature females of the parasitic crustacean Ergasilus. Ergasilus (gill maggots) will appear as grayish black and white... (click on image for more details)
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... (click on image for more details)
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