IMPACT OF DIFFERENT FOOD ITEMS AND STARVATION ON THE BIOLOGY AND LABORATORY MAINTENANCE OF BIOMPHALARLA ALEXANDRINA, THE INTERMEDIATE HOST SNAIL OF SCHISTOSOMA MANSONI IN EGYPT
Rizk, E., Abu- Naser, N., Mona, M. (1997). IMPACT OF DIFFERENT FOOD ITEMS AND STARVATION ON THE BIOLOGY AND LABORATORY MAINTENANCE OF BIOMPHALARLA ALEXANDRINA, THE INTERMEDIATE HOST SNAIL OF SCHISTOSOMA MANSONI IN EGYPT. EKB Journal Management System, 1(2), 159-185. doi: 10.21608/ejabf.1997.3382
El-Sayed Rizk; Nagla Abu- Naser; Mohamed Mona. "IMPACT OF DIFFERENT FOOD ITEMS AND STARVATION ON THE BIOLOGY AND LABORATORY MAINTENANCE OF BIOMPHALARLA ALEXANDRINA, THE INTERMEDIATE HOST SNAIL OF SCHISTOSOMA MANSONI IN EGYPT". EKB Journal Management System, 1, 2, 1997, 159-185. doi: 10.21608/ejabf.1997.3382
Rizk, E., Abu- Naser, N., Mona, M. (1997). 'IMPACT OF DIFFERENT FOOD ITEMS AND STARVATION ON THE BIOLOGY AND LABORATORY MAINTENANCE OF BIOMPHALARLA ALEXANDRINA, THE INTERMEDIATE HOST SNAIL OF SCHISTOSOMA MANSONI IN EGYPT', EKB Journal Management System, 1(2), pp. 159-185. doi: 10.21608/ejabf.1997.3382
Rizk, E., Abu- Naser, N., Mona, M. IMPACT OF DIFFERENT FOOD ITEMS AND STARVATION ON THE BIOLOGY AND LABORATORY MAINTENANCE OF BIOMPHALARLA ALEXANDRINA, THE INTERMEDIATE HOST SNAIL OF SCHISTOSOMA MANSONI IN EGYPT. EKB Journal Management System, 1997; 1(2): 159-185. doi: 10.21608/ejabf.1997.3382

IMPACT OF DIFFERENT FOOD ITEMS AND STARVATION ON THE BIOLOGY AND LABORATORY MAINTENANCE OF BIOMPHALARLA ALEXANDRINA, THE INTERMEDIATE HOST SNAIL OF SCHISTOSOMA MANSONI IN EGYPT

Egyptian Journal of Aquatic Biology and Fisheries
Article 10, Volume 1, Issue 2, June 1997, Page 159-185  XML
Document Type: Original Article
DOI: 10.21608/ejabf.1997.3382
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Authors
El-Sayed Rizk1; Nagla Abu- Naser2; Mohamed Mona1
1Zoology Department, Faculty of Science, Tanta University Tata,Egypt.
2Zoology Department, Faculty of Science, Tanta University Tata,Egypt
Abstract
The present investigation has been performed to study the effect of different food items and starvation on some biological
parameters and laboratory maintenance of B. alexandrina snail, the intermediate host of S. mansoni in Egypt. The growth rate, egg laying capacity, hatchability of deposited eggs, development of the newly hatched snails and the mortality rate of the experimental snails were quantitatively determined and compared with the control ones fed on dried lettuce. The tested experimental food items are, a market prepared food (the rabbit food pellets); a natural food source from the
common aquatic plants (Eichhornia carassipes, Lemna gibba and Ceratophyllum demersttm) and a mixed food (dry lettuce supplemented with milk powder). The biochemical composition of the three food items and control food were analyzed. The results showed that snails fed on  market food for a period of six weeks showed a significant increase in
the number of egg masses and eggs, the rate of the egg hatchability and in the rate of growth. Moreover, market food was found a suitable food for maintenance of newly hatched as well as adult snails as indicated by low mortality rate. The results also showed that hermaphrodite gland acini of snails fed on market food were most frequently in the final stages of oogenesis and spermatogenegsis, and their digestive gland tubules were well organized. The wet weight of
the digestive gland gonad complex was significantly increased than that of the control and other tested food items. In conclusion, the market food was recommended as the food for stock aquaria. 
Keywords
food items; Biomphalaria alexandrina; biology; maintenance; DGG complex; histology
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