Biomass production and Nitrogen fixation in stigonematales

Stigonematales are highly evolved group of Cyanobacteria by having heterotrichous habit and other morphological complexities. Present communication deals with the biomass-production (in terms of chlorophyll-a) and nitrogen fixation of ten selected strains of Stigonematales. It was found that Chlorogloeopsis-354, Hapalosiphon-53, Hapalosiphon-384 and Westiellopsis-29 were better biomass producing strains and Hapalosiphon-53 was best nitrogen fixing strain. Interesting observation was noticed that biomass production was found better in nitrogen enriched medium than in nitrogen deficient medium. Hapalosiphon-53 was found to be best biomass producing and fast growing strain in enriched medium and nitrogen deficient medium after 20^th day growth intervals.