الفهرس 
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Abstract
During this study 180 fishes were collected from 8 species which are Siganus rivulatus Forsskåll, 1775; Diplodus noct Cuvier and Valenciennes, 1830; Epinephalus fasciatus Forsskåll, 1775; Parpeneus forsskali Fourmanoir and Gueze, 1976; Oedalechilus labiosus Forsskåll, 1775; Lethrinus variegates Cuvier and Valenciennes, 1830; Thalassoma klunzingeri Fowler and Steinitz, 1956 and Atherinomorus lacunosus Bloch and Schneiden, 1801. They are examined for parasites at the period from December 2010 till November 2011. The parasites found are Trematodes (Pseudocreadium laymani Ramadan, 1979; Hexangium sigani Goto & Ozaki, 1929; Saccocoelium obesum Looss, 1902; Pseudopecoelina microdonii; Hamacreadium mutabile Linton, 1910; Helicometra hypoditis Yamaguti, 1934 and Neolebouria moretonensis.), Cestodes (Rhinebothrium sp.) and Nematodes (Anisakis simplex third stage larva, Procamallanus elatensis Fusco and overstreet, 1979) During the present study, 128 fishes were parasitically infected with prevalence 71.11%, Siganus rivulatus and Thalassoma klunzingeri showed the highest prevalence 100%, while the lowest prevalence belonging to Oedalechilus labiosus 11.11%. The recorded prevalence of trematodes reached to 47.05 in the infected fishes followed by nematodes with a ratio of 45% while the lowest prevalence was cestodes which recorded 7.95%. Thalassoma klunzingeri recorded the highest trematodes prevalence (71. 10%), while the lowest was Epinephalus fasciatus (20%). On the other hand, the highest cestodes infection was in Epinephalus fasciatus (28.89%), while the lowest was in Lethrinus variegates (3.30%). Siganus rivulatus was the highest infected fish by nematodes (60.22%) while the lowest infection was in Thalassoma klunzingeri (20.23%).Abu Qalawa area showed the highest parasitic infections among the examined fishes while the lowest infections were in Reef saad area. The histopathological study in Thalassoma klunzingeri revealed that there are chronic gastroenteritis and hepatopancreatic lesions due to triple infections in this fish species and this alternation in the infected tissues could be a direct result of the attachment of the parasites to the wall of the gastrointestinal tract which causes damage, degeneration and inflammatory reactions in the infected tissues and the adjacent tissues.