Flavobacterium columnare (F. columnare) is the causative agent of columnaris disease. This bacterium affects both cultured and wild. Vet Rec. Jun 1;(22) Flavobacterium columnare (Flexibacter columnaris) associated with severe gill necrosis in koi carp (Cyprinus carpio L). Information about the fish disease Flexibacter columnaris. Gives answers to why it occurs, what can be done.

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The only caution is that Trimethoprim can be a problem with fish with large bleeding sores, so if such sores or similar are present, it should not be used. This page was last flexibactter on 24 Aprilat Now that your fish are on coljmnaris right track to healing, flexibscter need to get them eating again. Languages Deutsch Svenska Edit links. The disease is highly contagious and the outcome is often fatal.

It has a clean, penetrating quality to it, but it is not irritating. Since it is difficult to absorb enough oxygen from the water using damaged gills, the fish will start breathing rapidly cokumnaris the fish might also swim up to the surface gasping for air.

IMPORTANT; often Columnaris infections are present in well circulated, oxygenated tanksunlike Aeromonas Infections which are often anaerobic and are much more common in tanks with poor circulation, high bio loads, and large amounts of organic wastes. Please note that Anabantids such as Gourami and bettas seem to be especially susceptible to this disease, which is good reason to practice good cleaning practices with these fish even though they have the ability to get oxygen from the air.

Finally, since Columnaris is an opportunistic aerobic infection even a well maintained aquarium can suffer from a Columnaris infection with even a slight opportunity for infection assuming this bacterial pathogen is present. Pimafix can aid as a natural “in-tank” treatment for VERY MILD columnais of Flexibacteria in combination with lower temps, salt, improving stressors including oxidative stressand baths I would NOT recommend it for more moderate to serious cases.

Treating Columnaris or Body Fungus – Not a True Fungus | CFLAS

Reference for use of Hydrogen Peroxide: The species was first described by Davisand the name was validated by Bernardet and Colmnaris The obvious first step is lowering stressors and improving water parameters not necessarily just “clean water” as outlined in these sections of this article. It is important to catch this disease early, as Flexibacter advances it attacks the internal organs making for more difficult treatment.


One specimen say flexibacted newly introduced one may succumb to the level of bacteria in the tank, while the others may not. Always dissolve the salt in a container of aquarium water first and add it slowly to the aquarium.

The picture to the right shows necrosis of the fins, please click the picture to enlarge.

Central Florida Aquarium Society

This is an important distinction, since it is often found on dying or dead tissue of a live fish, as well as the remains of a decomposing fish, shrimp, etc. Please see this article for more about Baths: It also helps remove the egg sacs and developing cysts of parasites that have settled in the gravel.

Unlike Doxycline, many Tetracyclines are primarily gram positive while Columnaris is a gram negative rod bacteria although Oxytetracycline is more broad spectrum than Tetracyline Hydrochloride, it is still primarily a gram positive treatment.

I would use plain salt non iodized or even; “SeaChem Cichlid Salt” which is a balanced salt with other essential elements necessary for most freshwater fish flexibwcter just cichlids as the name implies.

Reducing the amount of organic waste in the tank increases the efficiency of medications, particularly organophosphate-based ones used for treating parasites. This is NOT to say that sudden shifts in parameters such as spikes in ammonia assuming an aerobic environmentwill not trigger Columnaris, as this too is a stressor that can allow for an opportunistic Columnaris infection.

Oregon Grape Xolumnaris – It could save the world With severe quick moving Columnaris infections that have entered the bloodstream via a gill infection as noted flexibqcter in this articlecombining Kanamycin, Nitrofurazone and Folumnaris Wonder Shells is a strong option that address mineral Cations and also helps with osmoregulation and blood issues. This is what differentiates Saprolegnia referred to as fungus from Columnaris as you will not see the thin hair like structures upon fish with Columnaris.

The point here is that even if the symptoms look like Columnaris, but the water conditions do not match and one uses a treatment regimen likely not to work for Columnaris, this most likely was NOT a Columnaris infection!


Columnaris – Wikipedia

flexibwcter Columnaris bacteria normally feed on decaying matter, like the detritus in the gravel and left over fish food. Potassium permanganate, copper sulfateand hydrogen peroxide can also be applied externally to adult fish and fry, but can be toxic at high concentrations. Old age allows many opportunistic infections to get a foothold in at least the fish in question.

Secondary zoospores are more motile for a longer period of time than primary zoospores and as well are considered the main dispersion phase of Saprolegnia. colimnaris

Do not confuse Melafix with Pimafix, as Melafix is more of an antiseptic with no effect on Columnaris whatsoever! Aeromonas, Vibrio, Septicemia, Furunculosis Bacterial Infections The bottom line is Columnaris is an aerobic bacterial pathogen that does NOT thrive on organic wastes this despite claims of inaccurate, poorly researched articles about Columnaris such as one found at about.

It is noteworthy that Saprolegnia thrive in lower pH water, especially under 6. If you have ever seen a piece of fish food left in the aquarium and was covered in what looks like cotton, those are all fungus filaments doing their job of breaking down organics, and although they are a natural part of the aquatic environment, an overabundance of Saprolegnia Fungus caused by decaying matter especially in new aquariums can result with the Saprolegnia to start trying to break down your living fish and can also appear as cottony growths on the fish as well.


First, it has an antiseptic meaning it inhibits the growth and reproduction of disease-causing microorganisms quality, and clears excessive gill and skin mucous along with small particle debris.

Injured fish colunaris open sores will amplify this potential problem.

Retrieved 25 July This also includes lowering water temperature to 75F 24C. However, a fish having an intact epidermis is probably the best defense against saprolegniasis Hatai and Hoshiai, ; Pickering, It is not easy to control, and because the disease is related to stress, an effort to identify and correct the source of the problem is necessary to prevent excessive or chronic mortalities.