sg 3 controls the cyanobacteria or algae was determined to be related to the extent to which it reduces the chlorophyll a content in the cyanobacteria and algae cultures the lower the chlorophyll a content the more effective the bacterium sg 3 was at controlling a particular species of cyanobacteria or algae the particular species of cyanobacteria and algae tested are summarized in table 1 of the algae and cyanobacteria examined 7 days after inoculation bacterium sg 3 reduced the chlorophyll a content primarily in species and isolates of anabaena and oscillatoria a 77 reduction of chlorophyll a was noted for lyngbya sp utex 386 a culture that is cross referenced as oscillatoria chalybea in the utex culture collection catalog in shake flask cultures the lyngbya sp formed aggregates and adhered to the bottom and sides of the flasks these growth characteristics were very different from our culture of oscillatoria cf chalybea that exhibited growth characteristics of a planktonic species with the exception of one isolate chlorophyll a reductions of the anabaena spp ranged from 77 to 98 reductions for anabaena sp atcc 27892 and anabaena variabilis atcc 29413 were 14 and 77 respectively and anabaena variabilis utex 377 exhibited a 97 reduction no resistance to bacterium sg 3 was detected in any of the oscillatoria species that were tested and chlorophyll a reductions ranged from 94 to 98 although no statistically significant reductions in chlorophyll a were noted for any of the green algae microcystis.