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Egg-Laying Inhibition in Oncomelania Nosophora Maintained on Filter Paper¹

Oncomelania nosophora maintained on moist filter paper alone for a period of one year did not lay eggs. The lack of soil for the formation of the egg capsule and/or the inadequacies of the diet may account for the absence of egg laying. The survival rate of the snails maintained on moist filter paper for one year was slightly lower than those maintained in standard rearing dishes. When transferred to standard rearing dishes, the snails produced young in the normal reproductive pattern for the species.

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. DA-49-007-MD-307.