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Chromatium sp. blooming at an upper boundary of the H2S layer of Lake Kaiike was cultured in the medium of PFENNIG (1965) under a variety of light intensities. Specific growth rate of the bacterium (Y) could be approximated by frequency of the dividing cells (X) as follows: Y=0.098e3.8X(r=0.609) indicating that measurement of frequency of the dividing cells was very simplified method adequate to estimating the growth rate. In situ specific growth rate of the bacterium could be estimated as about 0.17-day-1, which is only about twice the maintenance rate constant obtained in the pure culture. Bacterial ability to depress growth capacity to such a low level in response to environmental limitations is considered one of the factors causing the bloom in Lake Kaiike.

Frequency of Dividing Cells of Chromatium sp. Blooming in Lake Kaiike as an Estimate of Growth Rate.