Studies on Ectoparasites Of Fresh water Fish

This study was carried out to reveal the external parasites that infest fresh water fish mainly Tilapia species (zilli, ourea and nilotica), clarias garipeins, common carp and mugil ” capito, cephalus”) collected from different localities in Sharkia gover2- Cichlidogyrus tiberinaus3- Cichlidogyrus tubicirrus magnus4- Cichlidogyrus arthracanthus5- Cichlidogyrus euzeti6- Cichlidogyrus longicornis longicornis 7- Cichlidogyrus thurstonae8- Heterothecium dicrophallum(2) Protozoa which are Trichodina domergue and Henneguya branchialis ,(2) Crustacean which are 6 stages of learnea species and Ergasilus species.Out of 424 examined fish, 156 (36.68%) were infested with externalparasites. Concerning the seasonal flactuation of these parasites the highest prevalence was observed in autumn followed by spring , then summer and winter.