الفهرس 
Introduction
Distribution of the Encysted metacercariae (EMC) in fish tissues and organs:Only 14 pages are availabe for public view
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Abstract
A bacteriological and Parasitological survey on Mugil cephalus from different fish farms in Dakahlia Province was conducted from November 2002 until November 2003, where fish are collected seasonally. Ectoparasites were found included Ciliated protozoa, represented by Trichodina sp., flagellated protozoa, represented by Ichthyobodo necator., Monogenetic trematodes and Encysted metacercariae of digenetic trematodes. The seasonal incidence of external parasites revealed that the highest rate of infestations was during spring season while the lowest rate was during winter season. Concerning the EMC, it reached a peak of infestation rate during summer season. Various bacteria were recovered namely A.hyDROPhila was the predominant bacteria, followed by P. fluorescens then the Streptococcal spp. from lesions designated haemorrhagic septicemia, and the seasonal incidence was coincided with high water temperatures especially in spring and summer seasons. The most clinical signs and postmortem findings of Mugil cephalus infested with ectoparasitic protozoa were in form of loss of appetite, irritation, skin cloudiness or focal reddening resulting from excess mucus production, hyperemic gills and grayishblue coat of excessive mucus secretion with frayed fins. The signs associated with bacterial infection were congestion and redness of the body fins especially the caudal and dorsal fins, inflammation as well as edema of the vent region, hemorrhagic patches allover the body, the most common observed postmortem changes were congestion and haemorrhage in all visceral organs. The result of histopathological investigation proved the presence of congestion and desquamation of secondary lamellae and necrotic changes, degeneration, in many organs as liver, kidneys, spleen, and intestine. Experimental infection using one isolate of A.hyDROPhila in apparently normal Mugil cephalus, revealed that the clinical signs & postmortem findings were similar to those revealed from naturally infected Mugil cephalus.