Egg-Laying Inhibition in Oncomelania Nosophora Maintained on Filter Paper

Edward D. WagnerDepartment of Microbiology and School of Tropical and Preventive Medicine, College of Medical Evangelists, Loma Linda, California

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Lois Wong ChiDepartment of Microbiology and School of Tropical and Preventive Medicine, College of Medical Evangelists, Loma Linda, California

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Summary

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.

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