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Koi Diseases

   

Disease

Primary Symptoms

Argulus

-  see Fish Lice

Anchor Worm Disease (parasitic)

-  presence of Lernaea or anchor worms on the skin

Cachexia

-  excessively thin body, to the point of looking 'triangular'

Carp Pox (viral)

-  presence of solid, waxy lumps on the koi

-  generally harmless but certainly unpleasant to look at

Chilodonella (parasitic)

-  heavy and labored breathing

-  rubbing of body against rocks and pond surfaces

-  skin cloudiness due to excess mucus

Cloudy Eye (bacterial)

-  milkiness over eyes

-  loss of appetite and energy

Columnaris Disease (bacterial)

-  see Cotton Wool Disease

Costia (parasitic)

-  rubbing of body against rocks and pond surfaces

-  skin cloudiness due to excess mucus

-  focal redness

-  long spells of lethargy at the pond bottom with clamped fins

Cotton Wool Disease (bacterial)

-  white spots around the mouth and head areas that spread to the body and fins

-  white cottony growths that eat away the mouth

-  disintegration of fins starting at the edges

Cotton Mouth Disease (bacterial)

-  see Cotton Wool Disease

Dropsy or Pine-cone Disease (bacterial)

-  swollen abdomen

-  raised scales that exhibit a pinecone appearance

-  usually leads to death

Finrot/Tailrot (bacterial)

-  begins with light, foggy patches on the skin

-  progresses to bloody, rotten tails or fins

Fish Lice (parasitic)

-  presence of fish lice (argulus) on the skin that look like dark spots at first glance; argulus is one of the very few fish parasites visible to the naked eye

-  rubbing of body against rocks and pond surfaces

Flexibacter Disease (bacterial)

-  see Cotton Wool Disease

Flukes (parasitic)

-  see Gill Flukes and Skin Flukes

Fungus (fungal)

-  wooly and cotton-like attachments on the body and fins which look green if algae-ridden

-  tissue damage follows if left untreated

Gill Flukes (parasitic)

-  presence of gill flukes on the gills and body

-  labored breathing

-  swimming in jerky motions

Gill Rot (fungal)

breathing difficulty or gasping at the water surface

Hole-in-the-Side Disease (parasitic)

-  see Ulcers

Hypoxia

-  lethargy

-  gasping at the water surface

Ich or White Spot (parasitic)

-  presence of small white spots all over the body and fins

-  rubbing of body against rocks and pond surfaces

Koi Herpes Virus (KHV) Disease (viral)

-  patches of dead gill tissue similar to those caused by columnaris disease

-  may have sunken eyes or rough skin

Leeches (parasitic)

-  presence of brown and gray worms up to an inch long on the body

Mouth Fungus Disease (bacterial)

-  see Cotton Wool Disease

Skin Flukes (parasitic)

-  whitish or cloudy skin due to excess mucus production

-  rubbing of skin against rocks and pond surfaces

-  long periods of rest at the bottom of the pond with clamped fins

Spring Viremia of Carp (SVC) (viral)

-  lethargy and uncoordinated movement

-  bulging eyes, skin hemorrhages

-  bloated appearance due to fluids in the abdomen

-  bloody mucus trailing from vent and within the intestine

Sunken Back Disease

-  back of the fish looks very thin and emaciated

-  falling off of flesh on both sides of the dorsal area

Tailrot/Finrot (bacterial)

-  begins with light, foggy patches on the skin

-  progresses to bloody, rotten tails or fins

Trichodina (parasitic)

-  extreme irritation of the fish leading to rubbing of body against rocks and pond surfaces

- frayed fins; milky or opaque fins and body

Ulcers (bacterial)

-  open sores on the body

-  can lead to death

 

 

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