الفهرس 
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Abstract
This study was carried out on 121wild tilapia (Oreochromis niloticus). Parasitological examination revealed intestinal parasites as acanthocephalan parasites (Acanthosentis tilapiae and Neochinorhincus spp) and an adult digenetic trematode (Thaparotrema botswanensis) and a monogenean parasite (Cichilidogyrus tilapiae) isolated from gills, besides un-identified encysted metacercariae (EMC) from musculature and Euclinostomum spp. EMC from kidney. Bacteriological examination revealed four pathogens (Aeromonas hydrophila, A.sobria, Vibrio alginolyticus and V. parahemolyticus). Confirmation was done by PCR and VITEK2 compac system. Prevalence of total parasitic infestation was (57.02%) and the total bacterial infection was (71.07%). Acanthocephaln infested fishes showed total vibriosis as (56.60%) and total motile aeromonas septicemia (MAS) as (35.85%). Fishes infested with the un-identified EMC showed total vibriosis as (56.36%) and total MAS as (54.55%). While fishes infested with Euclinostomum spp. showed the same prevalences of infection for total vibriosis and total MAS (53.85%). Results revealed increased bacterial infections in the parasitized fishes as parasitism affects fish immunity negatively, facilitates portal of entry for bacterial invasion and considered as a stress factor.