Abstract
1. The seasonal changes of aquatic fungi were studied in the bottom mud of Lake Nakanuma from October 1957 to September 1958. The water temperature of the bottom layer varied only 3°in the course of a year. The water became anaerobic from May to December in bottom layer.2. The aquatic fungi in the profundal bottom mud showed remarkable seasonal changes. They showed distinctly a mid-summer minimum and a mid-winter maximum. The variation of fungi had correlation with the dissolved oxygen in the water of bottom layer.3. Six species were isolated from the bottom mud through the year. Pythium sp. was seen through the year with the maximum in winter. Achlya flagellata, Achlya racemosa, Dictyuchus sp., Aphanomyces sp. and Saprolegnia sp. were obtained during the circulation and winter stagnation periods when the bottom layer water contained the oxygen.4. Some experiments were carried out in the laboratory on the effect of oxygen upon the fungus activity. The results were in accordance with the observations in natural lakes.
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