Based on the analysis of literature chlorophyll content per phytoplankton biomass unit (chl./B) in different environmental conditions is under consideration. This is caused by the need to obtain conversion coefficients in the evaluation of biomass using chlorophyll method. The high variability of chl./B because of complex dependence on abiotic parameters, algal composition and status, the water body trophic state restricts the use of chlorophyll for the accurate determination of phytoplankton biomass. However, the estimated assessment can be recommended based on calculated chl. B values for different trophic status of water bodies (0.18 in oligotrophic waters, 0.40 in mesotrophic and eutrophic waters, 1.03 in highly eutrophic water), and averaged on a large data rate chl./B values equal 0.53.

Keywords: phytoplankton, chlorophyll, biomass, environment factors

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