الفهرس 
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Abstract
The present study aimed to survey some of the ectoparasitic monogenean (Metazoa) parasites infecting commercially important marine and fresh water fishes from Suez, Hurghada and Beni-Suef Cities at the Gulf of Suez, Red Sea and Beni-Suef Governorate, respectively. 235 fish specimens were collected during the present study at the period from September 2012 to October 2013. The examined fishes assigned to eight different species of five families, these were: spotted coral grouper Plectropomus maculatus (F: Serranidae), brown spotted reef cod Epinephelus chlorostigma (F: Serranidae), Nile tilapia Oreochromis niloticus
(F: Cichlidae), redbelly tilapia Tilapia zilli (F: Cichlidae), mango tilapia Sarotherodon galilaeus (F: Cichlidae), Nile carp Labeo niloticus (F: Cyprinidae), parrot fish Scarus harid (F: Scaridae) and two red spot snapper Lutjanus bohar (F: Lutjanidae). Nine different monogenetic trematode worms representing four families were recovered from the examined fishes during the present study. These were: Acleotrema sp. (F: Diplectanidae) from Plectropomus maculatus, Pseudorhabdosynochus sp. (F: Diplectanidae) from Epinephelus chlorostigma, Gyrodactylus cichlidarum (F: Gyrodactylidae) from Oreochromis niloticus, Cichlidogyrus aegypticus (F: Dactylogyridae) from Oreochromis niloticus and Labeo niloticus, Cichlidogyrus tilapiae (F: Dactylogyridae) from Tilapia zilli and Sarotherodon galilaeus, Cichlidogyrus tubicerrus magnus (F: Dactylogyridae) from Tilapia zilli, Protoancylodiscoides sp. (F: Dactylogyridae) from Labeo niloticus, Diplectanum sp. (F: Diplectanidae) from Scarus harid and Haliotrema sp (F: Ancyrocephalidae) from Lutjanus bohar. Histopathological studies showed that, adult specimens of these parasites were seen attached between the secondary gill lamellae, the parasite penetrates deeply with its haptor to the gill lamella causing its damage and degeneration of epithelial cells leading to the formation of a cup-shaped depression as well as breakdown of the outermost layer of the coating epithelial cells. Moreover, an alteration of the normal position of the gill lamellae mostly occurred.
Key Words: Monogenetic trematodes – Freshwater fish – Nile River - Marine fish – Red Sea – Light microscopic studies.