الفهرس 
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Abstract
The present study was conducted on a total of 286 marine fishes of 3 species represented as ―92 Dicentrarchus labrax, 101 Dicentrarchus punctatus and 93 Sparus aurata‖ were collected in different seasons from Suez Canal in Ismailia Province to investigate the presence of parasites. There were moderate to severe pathognomonic lesions in the naturally infested fishes as deep penetration of tail by isopods, hemorrhagic areas on the body surface around mouth, on gill cover and at base of fins. The main P.M lesions were large section of gill filaments destroyed by isopoda, marbling appearance of gills infested by Lernanthropus kroyeri, Caligus sp. in buccal cavity, on inner surface of operculum and in branchial cavity, abdominal distension and emaciation, darkish spots on the liver and congested spleen and heart. The highest infestation rate was in D. labrax (71.74%), followed by D. punctatus (67.33%) then by S. aurata (9.68%). The isolated parasites were isopods (Renocila thresherorum, Nerocila orbignyi, Nerocila bivittata and Levonica redmanii), Praniza larva of Gnathiids, Lernanthropus Kroyeri, Caligus sp. (Caligus longipedis, Caligus minimus), monogenetic trematodes (Diplectanum aequans), digenetic trematodes (Tangenarchopsis chinensis, Lecithochirium angustiovum, Erilepturus hamate, Propycndenoids secundus) and nematodes (Hysterothylacium sp. Larvae). Seasonal prevalence, relation between fish body length and weight and infestation, histopathological picture, DNA barcoding gene (COI gene) were used to make the genetic characterization for the invasive species of Cymothoidae and will be recorded in the GenBank.