الفهرس 
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Abstract
This study has been applied on a total number of 480 marine fishes (140 Dicentrarchus labrax, 140 Siganus revulatus and 200 Moolgarda seheli) that collected seasonally from different areas of Ismailia governorate. The parasitological examination revealed two types of crustacean parasites where 6 species of copepods (Caligus minimus, Caligus longipedis, Caligus lichiae, Lepeophtheirus lichiae, Lernanthropus sp. and Lernanthropus kroyeri) and 4 species of isopoda (Renocila sp., Levonica sp., lironeca sp. and Nerocila sp.). While the result of the monogenea was 3 species (Pseudohaliotrema sphincteroporus, Paranella diplodae and Benedenia sekii) in all examined marine fishes. The total parasitic infestation in the examined marine fishes was highest in D. labrax followed by S. revulatus then M. seheli, where the total crustacean infestation was highest in in D. labrax followed by M. seheli then S. revulatus and the monogenetic trematodes infestation was high in S. revulatus followed by M. seheli then D. labrax. The prevalence of copepod in D. labrax was high in the intermediate length than shorter and longer fish. The seasonal prevalence of total parasitic infestation in D. labrax and M. seheli was the highest in the winter and the lowest was summer, while in S. revulatus was the highest in the spring and the lowest was autumn. The histopathological change and the pathognomonic abnormalities in gill of infested fish with ectoparasites depend on the number of parasites to make harmful effect on fish which reflect in fish health where heavy infestation destroy the gills and threat fish life. Molecular identification of Benedenia sp. using PCR analysis of the 28S rRNA (mix of C1/D2 pairs) was useful tool for identification. Then sequencing and phylogenetics revealed that our sample was more closely related to Benedenia sekii from Australia followed by Benedenia sciaenae from Australia.