الفهرس 
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Abstract
The present study was conducted on a total of 540 marine fishes of 3 species represented as (180 Dicentrarchus labrax, 180 Sparus aurata” and 180 Mugil cephalus) of different body weights and lengths which were randomly collected from aquacultured ponds from a private fish farm in Portsaid Governorate to investigate the presence of crustacean diseases. Affected fishes showed distress, surface swimming, rubbing the body against hard objects, excessive mucous secretion andemaciation. Postmortem lesions revealed destroyed gill filaments, marbling of gills, hemorrhages all over the body, abdominal distension and congested liver, spleen andstomach. The detected crustaceans were (Caligus sp, Lernanthropus kroyeri and Livoneca redmanii).The total infestation rate was (46.48%). The total prevalence of infestations was (61.67%, 45.56% and 32.22%) in D. labrax, S. aurata and M. cephalus, respectively. Autumn was the highest season of total infestation (77.78%). A treatment trial during autumn using Aloe emodin and Zooaromaor’ego powders at a dose of 2g/Kg diet/10 days on 315 naturally crustacean-infested fishes (123 D.labrax, 117 S.aurata and 75 M.cephalus) revealed high efficacy of Aloe emodin than Zooaromaor’ego in treating Caligus sp. and Livoneca redmanii-infested fishes.