Emergency Disease Control for WSV

White Spot Syndrome virus (WSSv) is the most serious viral pathogen of farmed shrimp. It is highly virulent and can spread rapidly, resulting in up to 100% mortality within shrimp farm populations in just 3-10 days. WSSv has been reported within all stages of the shrimps life cycle, from eggs to brood stock, decimating shrimp stocks and drastically affecting the productivity and profitability of the farm.

TRANSMISSION

Vertical transmission of the disease occurs from infected brood stock with horizontal transmission usually occurring directly through contaminated water, or via cannibalism of sick or dying shrimp.

Selecting Specific Pathogen Free (SPF) brood stock can help prevent vertical transmission, but the only real way of preventing horizontal transmission of the disease is through implementing a best practice biosecurity programme, utilising a proven effective disinfectant.

PATHOGENESIS

The pathogenesis of WSSv can be divided into two distinct stages. The first stage is when a newly infected shrimp is living in a stress-free environment. Under stress-free conditions the shrimp will show no symptoms of the disease, the virus is effectively under control and its spread is contained in the affected internal organ.

Stage two occurs when the infected shrimp are subjected to stressful environmental conditions. The disease becomes virulent with the virus spreading rapidly to the shrimps other vital organs, resulting in high levels of mortality.

VIRKON™ AQUATIC – UNIQUE FORMULATED DISINFECTION POWER BACKED BY SCIENCE

Virkon™ AQUATIC’s modern, powerful broad spectrum formulation has been scientifically developed to address and meet the pathogen control needs of the intensified shrimp production industry. As with pharmaceutical products, disinfectants with similar chemistries can have widely different performance when it comes to efficacy and kill power. Selecting the correct disinfectant for shrimp production biosecurity with a solid dataset is therefore critical for the survival of the shrimp.

With proven efficacy against the WWS virus, Virkon™ AQUATIC can be applied directly and continuously into shrimp ponds to reduce the risk of cross-contamination and prevent the disease from taking hold and helping to: 

  • Rapidly knock-down and control the infections
  • Reduce the rate of infection spread within the shrimp population
  • Reduce the risk of the infection spreading to adjacent ponds

BELOW IS AN EXAMPLE OF HOW BEST TO CONTROL WSSV WITH VIRKON™ AQUATIC

Disease Pathogen  Dilution rate Organic Challenge Salinity  Contact Time 
White Spot Syndrome White Spot Syndrome virus (WSSv) 5 ppm 20 mg/L 20 ppt 24 hours

NEIGHBOURING FARMS:

To prevent the spread of WSSv from an infected farm to its neighbours during an outbreak:

  • Install a plastic fence around the farm(s).
  • Treat all incoming water in the reservoir with Virkon™ Aquatic at 2ppm.
  • Apply Virkon™ Aquatic at 2ppm in culture ponds, and repeat every 7 days.
  • If shrimp mortality occurs in a previously uninfected pond, please follow the Emergency Disease Control (EDC) Biosecurity procedures as above.
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