Studies on the marine yeasts. IV : Yeasts isolated from marine plankton

1) A remarkable development of yeasts was observed in the storage of marine plankton that was stored for several days at 20℃ after the addition of chlortetracycline and citric acid. The plankton was completely surrounded by the pseudomycelium of the yeasts after 12 days storage as if the plankton were entirely changed into the yeast cells. 2) Eighty cultures of yeasts were isolated from the stored plankton. Sixteen of the cultures were members of genus Rhodotorula, 13 of Cryptococcus, 34 of Candida, 2 of Trichosporon, 1 of Torulopsis, 7 of Black yeast and 7 of yeast-like fungi. 3) After five days storage, 8 x 10^9 cells of yeasts developed in 1 g of pure cultured phytoplankton, treated with chlortetracycline and citric acid. 4) After six days storage, 2 x 10^9 cells of yeasts developed in 1g of Doliolum sp. (zooplankton) treated with these compounds. 5) In the storage of the treated plankton, developing yeasts were Rhodotorula (90 %) and Cryptococcus (10 %) during the first two days, and after seven days Candida was dominant genus. 6) The species of Candida varied according to the seasons. In summer they were C. parapsilosis var