Epizootic ulcerative syndrome

These lesions expand to form ulcers and extensive erosions filled with necrotic tissue and mycelium.

A provisional diagnosis can be made by using squash preparations of the skeletal muscle from beneath an ulcer to identify the septate hyphae of the water mould.

Infected fish should be moved into high quality water, where they may recover if their clinical signs are mild.

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.