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In the previous report (Yanagisawa et al., 1961) respiratory metabolism especially oxygen uptake of Oncomelania nosophora, an intermediate snail host of Schistosoma japonicum and effects of starvation upon it were investigated as the first step to lay a foundation toward the practice in the chemical control of this snail. Data obtained from the study on the effect of starvation revealed the gradual decrease in its oxygen uptake at the initial period of starvation, reaching and keeping a rather constant level in it, and a rapid recovery from the low level by re-feeding snails on rice-powder. No explanation, however, was given for such phenomena as seen in starvation and re-feeding experiments by the present authors. The present work is an extension of the previous one elucidating such a decrease and recovery mechanism in oxygen uptake by the quantitative determination of polysaccharide in the whole soft tissue of snails during starvation. Informations thus obtained and presented below would cast light upon physiology of the snails, especially its food habit.

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

PHYSIOLOGICAL STUDIES ON ONCOMELANIA NOSOPHORA, THE VECTOR SNAIL OF SCHISTOSOMA JAPONICUM II. EFFECT OF STARVATION UPON GLYCOGEN CONTENT OF THE SNAIL SOFT TISSUE