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Application of Radioisotopes to the Study of the Metabolism of Fresh-Water Snails (Gastropoda-Pulmonata)

Fresh-water snails (Helisoma duryi normale) were placed in solutions containing phosphorus, iodine or copper tagged with the respective isotopes P³², I¹³¹, and Cu⁶⁴. It was shown by means of autoradiographs of the snail tissues that the radioactive compounds were absorbed by the intestinal tract and became diffused through the various organs, with a tendency to concentrate in the hepato-pancreas, especially in the case of phosphorus. The toxic action of copper on the protoplasm was observed, confirming a previous histopathological study. Addition of a phosphate or a sulfate, which are often found in natural habitats of snails, did not interfere with the molluscicidal action of copper sulfate.