Abstract
Geosmin and 2-methylisoborneol (MIB) for the past seven years have been responsible for the occurrence of musty odors in Lake Biwa. These odorous compounds are present in the water either in solution or in a form attached to or sited in the body of the responsible cyanobacteria. The concentration of geosmin was found to decrease during its passage through the river. However, MIB was not affected. During the water shortage period of the summer of 1985, the concentration of geosmin was found to increase downstream of the Yodo river. This was attributed to a regrowth of Anabaenamacrospora caused by stagnation of the water in this region.
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