Oxygen consumption by Clonorchis sinensis (C.S.) was observed in a medium of valuable pH of KRP, lack of certain electrolytes of KRP and of glucose, acetic acid or propionic acid was added to KRP. The results were as follows. 1. In a different solutions, KRP with or without 0.4%-glucose, 0.9%-saline solution, the variation of oxygen consumption by C.S. was not significant. 2. Oxygen consumption by C.S. was inhibited by the solution of KCI, CaCl2, or MgSO4 in a 0.9% solution of saline. 3. Under the acidity, oxygen consumption was enhanced but under the alkality, it was inhibited. 4. Oxygen consumption by C.S. was inhibited by acetic acid or propionic acid in KRP solution. 5. C.S. keeping in KRP solution for a long duration, oxygen cosumption was reduced in the course of time.
