الفهرس 
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Abstract
This study was carried out to detect the prevalence and molecular identification of trematodes affecting some marine fishes. Fish species collected were 100 Dicentrarchus labrax and 100 Dicentrarchus punctatus from private farms at Ismailia provinces. There were no pathognomonic lesions in infested fishes except marbling of gills in fishes with gill monogenean infestations. P. M. lesions were haemorrhages, abrasions on skin, sluggish movement, abdominal distension and emaciation, pale liver, congesion of intestine with entritis in some cases. The higher infestation rate was in D. punctatus (52%) followed by D. labrax (35%). The isolated parasites in D. labrax and D. punctatus were monogenetic trematodes (Diplectanum bocqueti), Digenetic trematodes (Acanthostomum sp. and Allostomachicolina secundus) and encysted metacercariea. Detection some parasites using molecular biology (PCR). Seasonal prevalence, relation between fish body weight, length, sex and infestation, statistical analysis and histopathological picture were also recorded.
Key words: Marine fish, trematode, Dicentrarchus labrax and Dicentrarchus punctatus.