الفهرس 
INTRODUCTION
Henneguya suprabranchiae (Landsberg, 1987) and theirhistopathological impactsOnly 14 pages are availabe for public view
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Abstract
Taxonomical and morphological studies of the protozoan parasites infesting gill filaments, suprabranchial organ, skin and blood of the Nile catfish Clarias gariepinus inhabiting Nile Delta Waters particularly Damietta branch of the River Nile. Anatomical studies of these parasites with reference to the possible functions of their organs. Comparison with previously recorded protozoan parasites of the same host in Egypt and other countries all over the world. Studying the histopathological impacts of these parasites particularly Henneguya branchialis and H. suprabranchiae infesting the gill filaments and suprabranchial organ (respectively) of C. gariepinus. Also, the present study includes host tissues reactions towards the infection of these parasites. Comparison of the histopathological impacts as well as the host tissues reactions with previously recorded data of the same parasites and closely related parasitic groups. In the present study a survey has been given of the protozoan parasites infesting the gills, suprabranchial organ, skin and fins of the Nile catfish Clarias gariepinus inhabiting Damietta branch of the River Nile. The survey included the blood parasites of the same host. The pathological impacts of the myxosporean Henneguya branchialis to the gills of C. gariepinus and H. suprabranchiae to the suprabranchial organ of the same host were studied in detail. The present study was also extended to include the host tissue response towards these parasites. The present investigation of the gills, skin and fins of the Nile catfish C. gariepinus has revealed the presence of 10 ectoparasitic protozoans belonging to 7 genera. These protozoans are: Amphileptus sp., Chilodonella hexasticha, Trichodina matsu, T. magna, T. maritinkae, T. sangwala, Tetrahymena sp., Henneguya sp., H. branchialis and H. suprabranchiae. Asingle trypanosome species namely Trypanosoma alhussaini was recorded from the blood of C. gariepinus. Moreover, a single ectocommensal namely Vorticella sp. was recovered from the gills of the same host.