Outbreak of epizootic ulcerative Syndrome (EUS) in Seranochromis robustus Fish species in Darwendale dam, Zimbabwe

Abstract

The aim of the study was to investigate the causes of mortality of fish in Darwendale Dam in Zimbabwe. 
Findings of laboratory gross examination of lesions were consistent EUS. Histopathology examination 
showed that the fish had mycotic granulomas. Fish of all ages were affected. High mortalities and severity 
of ulceration suggests a relatively recent invasion by A. invadans at Darwendale dam. EUS spread from 
Darwendale to other areas due to improper surveillance and poor control strategy due to lack of EUS 
knowledge by fishermen and authorities. More studies needed to be done in Zimbabwe to determine 
species of fish affected, strain A invadans circulating and control measures to prevent spread of diseases.  
EUS was confirmed in Seranochromis robustus in Zimbabwe in 2013. The study is the first published 
account of infection with Alphanomyces. invadans in the wild fish populations (Seranochromis robustus) of 
the Darwendale Dam in Zimbabwe.