Amoebae isolated from organs of farmed tilapias, Oreochromis niloticus.

Three amoeba species were isolated from 3 out of 193 farmed tilapias, Oreuchromis niloticus (L.), screened for the presence of free-living amoebae in parenchymatous organs. Hurtmannella vermiformis Page, 1967 and Rosculus ithacus Hawes, 1963 were isolated from the kidney tissue. The third strain isolated from the liver shared morphological features of Mayorella and Platyamoeha spp. and therefore its taxonomic position has not been determined as yet. Pathogenicity of cloned strain of H. vermiformis was proved in two fish hosts.