الفهرس 
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Abstract
In a systemic survey on the ectoparasites of fresh water fish species;
Oreochromus niloticus. 600 fish specimens collected from Fish Research
Center of Suez Canal University. The incidence of infestation with the different
ectoparasite species was 84.5 % ( 507 fish were infested). The incidence of
infestation with trematode was (68.67 %), protozoa (48.0 %) and
crustacea(4.17 %). The detected ectoparasitic species and their incidence were;
three trematode species; Cichlidogyrus tiberianus (41.83 %); Cichlidogyrus sp.
(30.67 %) and the Encysted metacercaria (7.83 %); five protozoan species;
Trichodina fultoni (19.83 %); Trichodina microdenticulata (18.5 %);
Trichodina salmincola (17.5 %) Chilodonella hexasticha (3.33) and Myxobolus
dermatobia (0.17%) and three crustacean species; Lamproglena monodi (3.83
%) Lernaea cyprinci (0.17 %) andArgulussp.larva(0.17%). Theseasonal
dynamics showed that the peak of ectoparasites infestation was observed during
summer (93.33 %) and the lowest rate during Autumn (76 %). The highest
infestation rate with trematode was (77.33) in Summer and the lowest one (62.0
%) in Winter; and for protozoa, the highest in Summer, (59.33 %) and the
lowest one (34.0%) in Winter while for Crustacea; the highest (10%) in
Summer and the lowest (6.67%) in winter and on contrary, were not detected
during the other seasons.
This study cleared that Cichlidogyrus tiberianus was the most preve1ant
ectoparasite in this investigation, were its rate (50.0%) was the highest in
summer and the lowest (36.67%) in winter for Cichlidogyrus sp. the highest
(32.67%) was in summer and the lowest (27.33) in winter, while for Encysted
metacercaria the highest (10.67%) was in winter and spring and the lowest
(4.67%) in autumn. Concerning the Protozoan ectoparasites; Trichodina fultoni
showed the highest rate (25.33%) during summer and the lowest one (12.0%)
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during winter; followed by Trichodina microdenticulata as the highest rate
(24.67%) during summer and the lowest (12.0%) during winter; Trichodina
salmincola (22.0 and 11.33% during summer and winter respectivelly);
hilodonella hexasticha (9.33 and 1.33 % during winter and spring respectivelly
and not detected during summer. Dealing with the crustacean ectoparasites
detected cought the present investigation; Lamproglena monodi was the
prevalent one where showed the highest rate (9.33%) during summer and the
lowest (6.0 %) during autumn but not detected during winter and spring,
whereas Lernaea cyprinci was recorded only during autumn (0.67 %) and also
Argulus sp. Larva detected only in summer (0.67 %).
Concerning Trichodina salmincola and Trichodina microdenticulata of
the present study; These were recorded for the first time in Fishes in Egypt.
The morphological descriptions of the collected ectoparasites using photos and
Camera Lucida as well as the pathological and clinicopathological alterations
and also treatment of the infested fishes using potassium permanganate were
stated. As well as the present studies and results were also discussed in
comparison with those of the previous authers.
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