الملخص

In this research, a histochemical study was undertaken on a caryophyllidian , Khawia grypi, recently described from Barbus grypus .The materials detected were: protein using mercuric bromophenol blue, lipids using Sudan black B , deoxyribonucleic acid using Feulgen reaction, (t is recovered from the results that protein and lipids are present in large quantities in the tegument , muscle bundles, mesenchyma and excretory canals while DNA was present in these organism in reasonable quantities, however, it was more abundant in the mesenchyma. The reproductive organs have reacted in different levels after applying the three techniques , protein and lipids were abundant or moderate in these organs, while in cirrus pouch lipid was scarce. The gonad high content of the protein indicates the high physiological activities of these organs such as gametogenesis, supply the nutrients and metabolites transport.