is a simple GNU/GPL software for quick low-cost biomass coverage estimation of algae, cyanobacteria and other microorganisms in culture on Petri dishes.The usage for phytoplankton assessment is now being tested. The method of assessment biomass using NAJA image Analysis software is non-destructive and relatively cheap.

The results of this method were compared with results of chlorophyll a assessment after LORENZEN and were found to be fully sufficient for quite precise biomass estimation.

Citation
Full description of the method is available in Hauer, T. & Jirka L. (2007): Image analysis - a simple method of algal culture growth assessment. - Journal of Applied Phycology 19 (5): 599-601, http://dx.doi.org/10.1007/s10811-007-9154-y