Epizootic ulcerative syndrome
Epizootic ulcerative syndrome (EUS) is a disease caused by the fungus, Aphanomyces invadans. It infects many freshwater and brackish fish species in the Asia-Pacific region and Australia. The disease is most commonly seen when there are low temperature and heavy rainfall in tropical and sub-tropical waters. It may also be referred to as Mycotic Granulomatoses (MG) and Red Spot Disease (RSD).
Clinical Signs & Diagnosis
At first, fish develop red spots on the skin. These lesions expand to form ulcers and extensive erosions filled with necrotic tissue and mycelium. This is followed by the development of granulomas on the internal organs and death.
A provisional diagnosis can be made by using a squash preparations of the skeletal muscle from beneath an ulcer to identify septate fungal hyphae. Definitive diagnosis can be made based on histopathogical findings and fungal isolation.
Treatment & Control
Infected fish should be moved into high quality water, where they may recover if their clinical signs are mild.
If disease occurs eradication is required. Once the disease is eradicated good husbandry, surveillance and biosecurity measures are necessary to prevent recurrence. In countries free of Epizootic Ulcerative Syndrome, quarantine and health certificates are necessary for the movement of all live fish to prevent the introduction of the disease.
- Epizootic Ulcerative Syndrome, reviewed and published by Wikivet at http://en.wikivet.net/Epizootic_Ulcerative_Syndrome, accessed 08/09/2011.