METACERCARIAL ENCYSTATION IN BAGRUS BAYAD FRESHWATER FISH AT SOHAG PROVINCE, EGYPT

Document Type : Research article

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SUMMARY Fish tody has become a highly productive industry in Egypt due to the pressure of a rapidly exp < /strong>anding human population and lack of animal protein. Neverthless, a number of endemic larval parasites in freshwater Nile fish have a piscivorous mammalian carnivores as their final host and able to infect human due to the low host specificity of such adult stages. The present study attempts to find out any metacercarial infection in tissues or organs of Bagrus bayad collected from the markets in Sohag province. The present study showed that 60% of infection was localised in subcutaneous tissues, muscles and base of dorsal fin, while liver, kidney, spleen gills, intestinal wall, the body cavity and brain with its surrounding tissues were free from the infection. The number of metacercarial encystation were up to 31.25 cyst per gram of edible fish tissues. Metacercariae were identified according to the a dult worms which have been recovered after exp < /strong>erimental feeding of parasite free kittens into two groups. The first groups was related to family Cyathocotylidae and yeilded adults of Prohenistomum vivax. The second group was related to family Heterop < /em>hyidae and yeilded adults of Hap < /em>lorchis pumilio. The public health importance of these parasites was discused.

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