Columnaris

Columnaris is less of a “pure infectious disease” and more of an interplay between environmental factors, stress, and management errors. Prevention through stable water conditions and low-stress husbandry is the most effective protection.

All information at a glance

Columnaris disease is caused by water bacteria from the Flavobacterium group (Flavobacterium columnare). The bacteria primarily feed on proteins from mucus or feces and can even “eat away” at bone once they have settled on the fish’s mucous membrane.

Rice-grain-sized gill sample in 100% isopropanol

(Sample containers filled with 100% isopropanol can be ordered free of charge directly from Tauros Diagnostik or obtained from a pharmacy.)

1-2 days after receipt of sample at the laboratory

Samples delivered to us by 10:00 AM will be analyzed on the same day.

Per analysis from gill tissue: €35.20 (incl. VAT)

(Additional effort for submission of whole fish: €10.00 each)

From a clinical standpoint, Columnaris disease can occur in acute or chronic forms, depending on water temperature and quality as well as the pathogenicity of the bacteria.

Early detection

In addition to non-specific symptoms such as loss of appetite and restlessness, characteristic features include gray-white fuzzy patches, particularly in the mouth area (mouth fungus) or on the head and fins. Occasionally, these patches also appear on the sides of the body and the gills, or inflammation can be seen on the corresponding body parts. Damaged gills increase the respiratory rate and the animals become lethargic.

Acute clinical picture
The cotton-like fuzzy patches can appear on the entire body and develop into flat ulcers over time. Severe gill necrosis causes pronounced respiratory distress. Mouth fungus is highly contagious and, in extreme cases, can destroy the fish population within a short period of time.

Differentiation
Only targeted laboratory diagnostics (PCR) allow for clear differentiation.

Common clinical symptoms

  • Skin changes: Whitish-gray, cotton-like coatings on skin and scales, sometimes with a reddish border

  • Mouth and head area: Lesions on the mouth (“mouth rot”), abrasions, ulcerations

  • Fins: Fraying, fin rot, progressive tissue loss

  • Gills: Gill necrosis, mucus deposits, significantly labored breathing

Two ways to DNA analysis – choose what suits you best

Order – Digital

  • Recommended for fast online processing

The fast and cost-effective way: Order your DNA analysis online and receive the results conveniently as a digital certificate in your own archive. Transparent, efficient, and accessible at any time, wherever you are.

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Order – Paper form

  • Recommended for classic documentation

The classic way to DNA analysis: Submit your samples with an order form and receive the results as an official certificate in paper form. Ideal for those who value printed documentation.

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