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Columnaris #029
March 09, 2012

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Columnaris Koi Disease What is it and is it a danger to your Koi?

Columnaris is not a new Koi disease but it can show up occasionally and when it does it causes a lot of damage to your Koi in a short amount of time.

Columnaris is a bacterial infection caused by the bacteria Flavobacterium Columnare. It's been around since man started culturing fish and is present on practically all fish and in all fish symptoms from home aquaria to 500 acre catfish farms. As with most pathogens, it causes few problems in the absence of stress to the fish. Over crowding, poor water quality, and especially sudden environmental changes can compromise the fish's immune system, leading to a Columnaris out-break. Fish are especially vulnerable to it after experiencing the stress inherent in shipping, so be on the lookout for it for a few days after receiving fish from us or any other breeder.

We are excited to announce Blue Ridge Koi now has available 2 NEW Premium Koi Box Sets!!

Hikari Mix

Koi Select Sales

The Hikari Mix is a pleasant blend of orange, white, yellow, and blue fish. These fish are known as "metallic koi" because of their fins, which are opaque rather than transparent.


Microscopically, these bacteria appear as long thin rods, usually clumped together to form dome shaped masses with a "hay stack" appearance. Fish can develop a white film over their body with disintegrating fins and tails. Advanced infections will cause the fish to become emaciated with sunken eyes and necrotic gills. Anytime you see these symptoms along with rapid mortality, especially in warmer water, you should suspect Columnaris. Left untreated it can kill 50% of a population in 2 or 3 days.


Most importantly, realize that Columnaris is not a fungus. (Despite the marketing of "fungus" medications, true fungus infections that cause mortality in koi and goldfish are rare). So medications used to treat fungus, anchor worm , ich and other parasites will be ineffective. Melafix, formalin and malachite, praziquantel, and salt won't work. So look for medications with antibiotics in them. Nitofurazone, Furazolidone, Tetracycline and Oxolinic Acid have been shown to be effective. We've found that Nitrofurazone seems to work best.

Showa & Utsuri Mix

Showa & Utsuri MixThis Mix consists of two of the most popular varieties of koi - the Showa and Utsuri.

Order your set today!

Koi Select Sales

We here at the Koi Pond Guide hope you are enjoying your newsletter. Feel free to pass this newsletter on to your friends or family!

, we would love to hear your comments, and questions are welcomed and appreciated! Also, if you have any photos you would like to share of your pond, fish or plants we would love to see them, so send them in.

Happy Ponding!

The Koi Pond now has a great line of products to help you with your Koi and Pond needs. Koi Pond Products

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