الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 165 |  |  |
| | | from | 165 | | |
Abstract
The present study was carried out on 630 specimens of 0. niloticus fish randomly collected from fish
farms, canal branches and River Nile (Rasheed branch, Kafr EI Sheikh Governorate) at spring,
summer and autumn seasons.To overview the clinical picture of ectoparasitic infestations which
revealed asphyxia,dullness, emaciation,excessive amounts of mucus,scale sloughing,haemorrhagic
wounds, frayed ragged fins, Marbling appearance with numerous white dots in gill filament,
exophthalmia and opacity of eyes. The isolated parasites were 9 species : Ichthyophthariuis
multiphilus, Trichodina Jultoni, Chilodonella hexastica, Ichthyoboda necatrix, Myxobolus dermatobia,
Cichlidogyrus tilapiae, Gyrodactylus sp, Ergasilus ovatus and Lamporgelena. The highest prevalence
was in farms 27%,then in branches 20.6% and finally in River Nile 17.4%. The highest infestations
were by protozoa followed by monogenia then mixed infections ,Cnidaria and finally Crustacean. The
highest seasonal prevalence of infestations were in summer followed by spring then in autumn in all
areas. The water analysis revealed that the highest levels of ammonia, salinity, alkalinity and pH were
of that sample of farm while the lowest DO levels.The infrected fish revealed a significant decrease in
RBCs count, Hb and PCV% , While increase in WBCs count and heterophils with a decrease in
agranulocytes % ,marked elevation in blood glucose level and decrease in serum cholesterol levels.
Application of three differert doses of medicinal plants for treatment trials as 400 mgGarlic,800 mg
Artemisia and mixture of (400 mg Garlic+ 800 mg Artemisia) / kg diet for 15 days revealed that, the
best effective dose causing a great damage to the parasites was the mixture.