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Oncomelania quadrasi, the vector snail of Schistosoma japonicum in the Philippines, is said to have been found in waters ranging from pH 6.2 to pH 7.8 and on soils ranging from pH 4.6 to pH 7.2 (Pesigan et al., 1958). On the pH range conditioning the activity and survival of O. nosophora, however, very few reports are available. As to the effect of sea water on the survival of Oncomelania snails, Muto et al. (1915) and Nagao et al. (1918) noted that when snails were submerged into sea water experimentally all of them died within 49 hours and 4 to 6 days, respectively. Practically, the habitat of O. nosophora in Suzunuma district of Shizuoka Prefecture was flooded with sea water in July 1917 and as a result of this almost all snails were found dead (Muto et al., 1918). The present report gives data concerning the effect of pH and salinity on the extruding responce and survival of O. nosophora.

japanese journal of medical science and biology/japanese journal of medical science and biology

THE EFFECT OF HYDROGEN ION CONCENTRATION AND SALINITY OF WATER ON EXTRUDING RESPONSE AND SURVIVAL OF ONCOMELANIA NOSOPHORA, THE VECTOR SNAIL OF ONCOMELANIA NOSOPHORA, THE VECTOR SNAIL OF SCHISTOSOMA JAPONICUM IN JAPAN* **