الفهرس 
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Abstract
This study carried out to investigate the prevalence of trematodal and
cestodal infections in Clarias gariepinus and Oreochromis niloticus. The
isolated parasites were identified as: in Oreochromis niloticus; the
Cichlidogyrus arthracanthus, Cichlidogyrus longicornis longicornis,
Cichlidogyrus tilapiae, Cichlidogyrus aegypticus, Cichlidogyrus tubicirrus
magnus and Enterogyrus cichlidarum whileas Clarias gariepinus isolated
Quadriacanthus aegypticus and Macrogyrodactylus clarii as monogenean
infections. Clarias gariepinus infected with the digeneans; Emoleptalea sp.,
(from intestine), Phyllodistomum sp., (from kidney) as new records in Egypt,
Orientocreadium batrachoides, Orientocreadium lazeri, Astiotrema reniferum,
Paramacroderoides echinus and Eumasenia aegypticus. Encysted metacercariae
of digenetic trematodes recorded as Prohemistomum vivax and Mesostephanus
sp., in both Clarias gariepinus and Oreochromis niloticus, whileas,
Centrocestus formosanus, Clinostomum tilapiae, Clinostomum complanatum,
Euclinostomum heterostomum, Euclinostomum ardeolae, Posthodiplostomum
sp., Bolbophorus levantinus and other diplostomatid metacercariae in
Oreochromis niloticus were isolated. On the other hand, experimental feeding
infections of laboratory animals; rats and mice with unidentified encysted
metcercariae from revealed; Prohemistomum vivax, Mesostephanus burmanicus
and Mesostephanus appendiculatus as adult flukes. Proteocephalus sp.,
Polyonchobothrium clarias, Polyonchobothrium sp., and Monobothrioides as
well as immature stages of cestodes recovered from Clarias gariepinus. Clinical
signs, postmortem examination, hematological, serological and histological
investigations of infected fish were recorded.