الفهرس 
Introduction and Review of literatureOnly 14 pages are availabe for public view
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Abstract
The present study dealt with Pirenella conica snail, the intermediate host of Heterophyid trematodes. Parasitic infection of the snail was found to be relatively high affecting 36% of the examined population. The obtained results can be summarized as follow: 1- A significant decrease (P≤0.5 (in the total protein concentration in the cephalopedal mass by 44.5% and in the digestive gland by 45.7%. 2- A significant decrease in the total lipids concentration in both the cephalopedal mass by 70% and in the digestive gland by 78%. 3- Small range of variation of glucose concentrations in both the cephalopedal mass by 22.3% and in the digestive gland by 34.8%. 4- A significant increase in the uric acid concentration in both the cephalopedal mass by 63.7% and in the digestive gland by 37.8%. 5- A significant increase in the superoxide dismutase (SOD) activity by 49.6% in the cephalopedal mass and by 55.7% in the digestive gland. 6- A significant increase in the Glutathione-S-transferase (GST) activity by 55% in the cephalopedal mass and by 60% in the digestive gland. 7- A significant increase of the nitric oxide production by 61.3% in the cephalopedal mass and by 66% in the digestive gland. 8- Considerable changes in digestive gland including mechanical damages of the digestive tubules due to larval movement, feeding, growth and multiplication; and physiological changes as necrosis which are the result of the release of proteolytic enzymes from the ruptured digestive cells. 9- A significant increase in P53 % and in apoptosis % in the digestive gland cells. 10- A significant decrease in BCl2 % in the digestive gland cells. 11- Increase in tail length and DNA migration and fragmentation in the digestive gland cells. 12- Significant depressions, of two biogenic monoamine dopamine and serotonin levels in the soft parts.