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Can epizootic ulcerative syndrome (EUS)-affected fish be treated?

Which species are not susceptible or affected by EUS?

Nile tilapia (Oreochromis niloticus), common carp (Cyprinus carpio) and milk fish (Chanos chanos) are believed to be naturally resistant to infection with Aphanomyces invadans.

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Nile tilapia and common carp are frequently farmed species in Africa and feral populations are widespread in some natural waters.

Figure 30. Oreochromis niloticus – Nile tilapia. Farmed fish such as this one from a farm on Lake Kariba, Zimbabwe, have been extensively introduced for aquaculture in Zambia and Zimbabwe.

Figure 31. Cyprinus carpio – Common carp. An introduced species that has become feral in some freshwater systems in Southern and Central Africa and is popular with recreational fishermen.

©FAO/D. Huchzermeyer, Rhodes University

©FAO/T. Sinclair, Lydenburg, South Africa

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