Additional DNA Tests for Fish

Early detection before visible symptoms appear

Many bacterial infections are subclinical in early stages. DNA tests detect pathogens even at very low bacterial loads—before losses occur.

All information at a glance

Many fish diseases show similar symptoms, e.g., lethargy, skin changes, respiratory distress, etc. Our DNA analyses provide a clear differential diagnosis, enabling appropriate therapy to be initiated. This minimizes the use of antibiotics or chemicals and prevents resistance and environmental pollution.

DNA Test for Flavobacterium psychrophilum

  • Sample Material
    rice grain-sized gill sample in 100% isopropanol
  • Test Duration
    1-2 days
  • Cost per Analysis
    €35.20 (incl. VAT)

Clinical Picture
The causative agent of cold water disease is Flavobacterium psychrophilum. Cold water disease occurs, as the name suggests, at water temperatures around 10°C.

The former designation “peduncle disease” describes the occurring symptoms. The typical lesion begins as a small whitish to bluish spot behind the dorsal fin. From here, the necrotizing inflammation spreads from the fin base across the entire caudal peduncle. In some cases, the destruction of muscle tissue leads to loss of the caudal fin or exposure of the spine.

DNA Test for Aeromonas salmonicida

  • Sample Material
    liver tissue in 100% isopropanol
  • Test Duration
    1-2 days
  • Cost per Analysis
    €35.20 (incl. VAT)

Clinical Picture
Furunculosis is an infectious disease caused by the bacterium Aeromonas salmonicida, which primarily affects salmonids of all age classes. The disease occurs more frequently in summer at high water temperatures, oxygen deficiency, overfeeding, and other stress factors.

The typical disease symptoms are boil-like ulcers that appear individually or in groups over the entire body surface, often in the dorsal region. In some cases, bleeding occurs on the inside of the gill covers, the eyes, and the fins. As with most other bacterioses, several disease forms (ulcerative form, hemorrhagic form, intestinal furunculosis, and asymptomatic form) are distinguished.

Fish with furuncles become sluggish in their movements 8-14 days after disease outbreak, separate themselves, and remain at the pond edge. In addition to contact infection, oral uptake of infectious material is also considered a mode of infection, alongside pathogen-containing water and infected eggs. Carcasses of furunculosis-infected trout remain infectious for 6 days after death at 5°C. Entry points for infection are skin damage, e.g., from parasite infestation or epithelial defects on the gills. The incubation period for the disease in salmonids is 7-10 days at optimal temperatures.

DNA Test for Yersinia ruckeri

  • Sample Material
    rice grain-sized gill sample in 100% isopropanol
  • Test Duration
    1-2 days
  • Cost per Analysis
    €35.20 (incl. VAT)

General Information
Enteric redmouth disease is a generalized infectious disease caused by the bacterium Yersinia ruckeri, occurring in acute or chronic form, to which salmonids, particularly rainbow trout, are especially susceptible.

However, many fish species also carry the pathogen as asymptomatic carriers. Externally, the animals appear completely healthy, but they can excrete the pathogen in stressful situations and infect other animals.

Bleeding frequently occurs in the skin and muscle areas, as well as inflammation of the intestine and spleen enlargement.

For the outbreak of the disease, in addition to host susceptibility and pathogen virulence, stress factors such as high stocking density, feed changes, poor water quality with high ammonium and/or low oxygen content, or transport of the animals play a decisive role. Elevated copper levels in the water can also increase fish susceptibility.

Your Advantages

  • Early disease detection – many infections are initially low in symptoms

  • Prevention of stock losses through insidious infections

  • Differential diagnoses – diagnostic clarity prevents incorrect treatments

  • Stock and biosecurity – through appropriate therapeutic measures

Two paths to DNA analysis—choose what suits you

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 digitized certificate in your own archive. Transparent, efficient, and accessible anytime, wherever you are.

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Order – Paper Form

  • Recommended for traditional documentation

The traditional path 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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