Survey of External Protozoa Parasites of Two Fish Species of (Oreochromis niloticus and Clarias lazera) in Khartoum State-Sudan

The aim of this study to survey the external protozoa parasites in Oreochromis niloticus and Clarias lazera in Khartoum state –Sudan. Seventy samples of fish were examined (40 samples of  Oreochromis niloticus and 30 samples of Clarias lazera) were collected from three different sites in Khartoum state include: Jable Awlia Reservoir pond- College of Vet Medicine and Animal Production culture pond- Alsaham Alzahabie pond. The study conducted from March to August 2010 . The study revealed different type of protozoa in Oreochromis niloticus and Clarias lazera. Chilodonella and Icthyopthirius were recovered in and Clarias lazera (95%) in Jable Awlia Reservoir pond. Trichodinia was found in Oreochromis niloticus (80%) in Alsaham alzahabie pond and also found in Oreochromis niloticus in College of Vet. Medicine culture pond with density more than Clarias lazera.  Oreochromis niloticus had high prevalence rate of protozoa parasites than Clarias lazera. There is no any relationship between number of parasite and health status of fish.