الفهرس 
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Abstract
This study was conducted on 175 Dicentrarcus labrax ,175 of Mugil cephalus and 175 of Moolgarda seheli The clinical examination of the infested fish showed respiratory distress, surface swimming, bulging of opercula, sluggish movement, emaciation and sever erosion and hemorrhages of gills .Hemorrhagic areas was found on gill cover and in late stages, external ulcers located in the gill filaments. The total prevalence in different examined fish species 55.05% .The prevalence of infestation in D.labrax was 48.57% , the prevalence of infestation in M.cephalust was78.28% and the prevalence of infestation M. seheli was 38.29% .The infestation rate in summer was the highest (75.56%), followed by autumn (44%), followed by Spring (42.67%) and then winter (28%). The study also showed that fishes with high weight are the highest percent of infestation as well as the female fish appeared liable to infestation than males , also, the greater the length of fish the more susceptiblity to parasitic infestations. The infested fish with parasites lose weight which lead to economic losses at marketing in marine farms.