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Effects of Water Level Fluctuation on Egg Laying in Oncomelania Nosophora and Oncomelania Quadrasi¹

Experiments on the effect of flooding culture dishes containing Oncomelania nosophora gave results that were variable, but the combined results showed a reduction in the number of eggs laid. Flooding experiments conducted on Oncomelania quadrasi showed an increase in egg laying in the ratio of 2.2:1. Oncomelania nosophora laid approximately 92% of the eggs above the water line, and Oncomelania quadrasi laid about 84% of their eggs in that position. Fewer young snails were found than eggs, probably because some of these died and the shells were not recovered, and probably because some eggs failed to hatch.

¹ This work was conducted under the sponsorship of the Commission on Parasitic Diseases, Armed Forces Epidemiological Board, and was supported by the Office of the Surgeon General, Department of the Army under Contract No. DA49-007-MD-307.