الفهرس 
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Abstract
This study has been applied on a total of (400) marine fish of five species (100 Alepes djedaba, 100 Dicentrarchus labrax, 100 Argyrosomus regius, 40 Saurida undosquamis and 60 Siganus revulatus) of different body weights and lengths which were collected in different seasons from Ismailia Governorate from April 2018 to December 2019. The examined fish showed no pathognomonic clinical abnormalities and were apparenently normal. Some Argyrosomus regius infested with digenea showed abdominal distention, pale coloration and emaciation. Affected Dicentrarchus labrax with digeneaniasis showed hemorrhagic areas on operculum, abrasion, ulcerations of fins and abdominal distention. On the other hand, liver was hemorrhagic and fatty in some examined Argyrosomus regius, slight marbling of gills with excessive mucus secretion, and slight abdominal bulging were also recorded. The total prevalence of infestation was 21 %. The highest percentage was in Saurida undosquamis 30% followed by Dicentrarchus labrax 20%, Alepes djedaba was 19%, in Argyrosomus regius 17% and then Siganus revulatus 11.66%. The isolated parasites were digenea (Erilepturus hamati , Erilepturus tiegsi , Erilepturus lemeriensis, Acanthostomum spinices , Sclerodistomum sp. and Lecithochirium fusiformi), larval cestodes (Pseudogrillotia sp. and Callitetrarhynchus gracilis ), Nematodes(Hysterothylacium aduncum and Procamallanus inopenatus)and acanthocephalan parasites (Neohydinorhynchus macrospinosus).The histopathological alterations were recorded and discussed.