| Abstract: |
Morphology, identifcation, nomenclature, distribution, seasonal and relative prevalence, host specificity and histopathology of some ectoparasites which foundinfesting some important marketed marine fish from both Mediterranean Sea and Red Sea, were studied.A total of 2620 fish were collected from the Mediterrenean Sea and RedSea , and examined for the presence of ectoparasites . The collected fish hosts were 16 species, belonging to 8 families.The total infested fish with ectoparasites were 650 (24.81 0/0) fish. The total infested fish hosts with monogeneans were 520 (19.85%) , with digeneans were 50(1.91 %), with protozoa were 21 ( 0.80%) ,and those infested with crustaceans were 59 (2.250/0) from the Red Sea, 1155 fish (9 species belonging to 5 families) were collected, among them 189 (16.36%) fish were found to be infested with variousspecies of ectoparasites. The number of infested with monogenea were 115(9.96%) ,with digenea was 36 (3.120/0), and those infested with crustacea were38 (3.29%) fish.The gills were the common site of infestation with ectoparasites, while,the buccal cavity, lower and higher pharyngeal teeth plates, pharynx and the skin were infested with lower numberThe monogean parasite Encotyllabe spari was found infesting the pharyngeal teeth plates and the gills of Acanthopagrus bifasciatus and Argyropsspinifer in the Red Sea. The highest prevalence was found in summer in both hosts (20.00% and 13.330/0) respectively,while, the lowest prevalence was found in winter and autumn (15.380/0 and 5%) respectively. The relative prevalence reached (8.94% and 8.5
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