Parasites of Oreochromis niloticus from Nubia Lake,Sudan

The aims of the study are to provide information about the parasites of Oreochromis niloticus in Nubia Lake, Sudan, Identify the collected parasites to the genus level and determine the prevalence and intensity of infection with respect to sex and length. A total of 1200 specimens of O. niloticus were investigated for parasites. The fish samples collected in the period from (September, 2015 to August, 2016) and were measured and sexed by internal examination of gonads. A total of 1200 specimens of O. niloticus from Nubia Lake were investigated for parasites. The results obtained in this study revealed the presence of (Nematode) Contracaecum sp., (Trematode) Clinostomum tilapia, cyst of Clinostomum sp. in buccal cavity and on kidney, The total infected fish were 953from the total number of O.niloticus examined (1200) taken from the Nubia Lake. In 471kidney samples the prevalence of parasites was 39.3% of infection and the intensity was 49.4%. In 261 buccal cavity samples the prevalence of parasites was 21.8% of infection and the intensity was 27.4%. The general percentage of infection was 79.4%.A total of infected male fish were 492 out of 611 males examined; and the total of infected female fish was 477 out of 589 females examined of O.niloticus from the Nubia Lake. The results obtained that there is no relation between the infection and the total length, the total weight and the sex .The infection is highest in January 91% and lowest in October 68%.The Kidney have the highest intensity (49.4%).

Keywords: O. niloticus, parasites, intensity and prevalence.