Infection with Aphanomyces invadens (epizootic ulcerative syndrome)

Last Modified: Fri, 23 Jun 2023 10:15:13 IST
Disease name Infection with Aphanomyces invadens (epizootic ulcerative syndrome)
Animal Health Law Category if applicable N/A
Species affected Fish
Description Epizootic Ulcerative Syndrome; also known as Red Spot Disease, Mycotic Granulomatosis or Ulcerative Mycosis; is caused by infection with the fungus Aphanomyces invadens. This causes necrotising ulcerative lesions which can appear as red spots or various sizes of ulcerative lesions on the body which are often complicated by secondary infection of Gran negative bacteria. The ulceration or red spot is caused by the zoospores attaching to the skin of the fish and from there the hypae invade through the skin to the underlying muscle and internal organs of the fish. The fish exhibits loss of appetite, the fish becomes darker in colour, can float near the surface and display hyperactive jerky movements. Often the result is death but mild to moderately affected fish have been seen to survive and recover. It is seen in multiple species of wild and farmed fish worldwide with cases seen in North America, South America, Asia and Australia
Status in Ireland Disease Absent
Date of Last known case of disease in Ireland Never Reported
DAFM Division Responsible The Marine Institute
Link to relevant external website
Notifiable in Ireland No
WOAH Listed No