Abstract
This study was carried out on 694 Clarias gariepinusand 846Oreochromis niloticus fish specimens. The fish were randomly collected seasonally, from different fish farms of El-Abbassa, Abu-Hammad, Sharkia Governorate, Egypt. They were used to investigate the prevalence of cestode parasites in C. gariepinus and O. niloticus. Parasitological examination of these fishes revealed that the, highest prevalence rates of Cestodain the fish were recorded in small fishes during summer and the lowest values were observed in the samples of the large size during winter. The study concluded that, the C. gariepinus are more attacked by internal cestode parasites compared O. niloticus. Parasites included Proteocephalus glanduligerus, Polyonchobothrium clarias and Monobothrium sp. The morphology of each species was compared with earlier descriptions, and a diagnostic character of intestinal Cestode species in this geographic region was developed.
Highlights
Freshwater fish parasitology is an important and rapidly advancing field of aquatic science
Gariepinus and O. niloticus was recorded during summer and the minimum during winter; this could be related to the availability of intermediate hosts of these parasites at these seasons and increase the feeding activity in warm temperature
Was nearly similar to (Eissa et al, 2011) who recorded the highest prevalence in spring and the lowest prevalence occur in winter and (Akinsanya et al, 2008) who recorded increase prevalence of cestodes in spring and summer
Summary
Freshwater fish parasitology is an important and rapidly advancing field of aquatic science. Fish parasites constitute the main cause of economic losses in aquaculture, including various types of pathogens (protozoa, trematodes, cestodes, nematodes, acanthocephalan and crustacean parasites), those causing, deformity, weight loss mortality etc (Eissa, 2002). Cestodes are known to inhibit nutrient absorption and is more pronounced in cultured species due to overstocking coupled with poor water quality management (El-seify et al, 2011). Parasites affect the fish host through destroying tissue, removing blood and cellular fluids, diverting part of its nutrient supply and allowing secondary infections to develop .Factors that enhance parasitic infection include nature of ponds ,quality of feed, culture systems, and low oxygen levels resulting from poor pond management (Abowei et al.,2011 and Lugo,2014). The objective of study to assess the prevalence of Cestode parasites infected O. niloticus and C. gariepinusunder in El-abbasa fish farm
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