Koi & Pond Water Care

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Pond Water Quality

Pond Ammonia
Pond Nitrite
Pond Nitrate
Pond pH
Pond pH Crash
Pond Dissolved Oxygen
Pond Hydrogen Sulfide
Pond Water Changes
Pond CO2

Parasites Main

Koi Flukes
Koi Trichodina
Koi Costia
Koi Chilodonella
Koi Ich
(White Spot)

Medications Main

Potassium Permanganate
Chloramine T

Shotgun Remedy

Feeding Koi

Go Green 100% Natural Aquameds

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Pond Care Treatments

Deadly Bacteria Control
Remove Bottom Sludge
Remove Ammonia Spikes
Control Organic Growth
Maintain a Healthy Pond
Winter Pond Care

Koi Costia (Ichthyobodo necatrix)

Costia or Ichthyobodo necatrix, is a ciliated protozoan parasite of freshwater fish that also has the capability to kill pond fish in great numbers, and in no short time-span. The only good fortune in this is that most Costia perishes readily when salted. Costia may be attached, or free swimming. Attached Costia look like little commas stuck into the skin (or gill) by the thin end. Free swimming Costia are graceless wobbly swimmers that look like commas or almost like half open Conch shells.

In most cases, Costia clears easily with salt, and this infection should be suspected when a lot of fish are dying, fins may be reddened, and it appears that the koi fish cannot breathe very well. Spider web lesions in rapidly dying pond fish are also characteristic as well as excess mucus.

When salt is ineffective in treating Costia, Terminate is recommended.

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