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This study evaluated the possibility of using  Oocystis borgei  to prevent and control harmful algae blooms. Firstly,  Microcystis aeruginosa  and  O. borgei  were co-cultured to assess the competition for nutrients between them. Different physiological and biochemical parameters, such as growth, cell membrane permeability and esterase activities were determined in exudate culture experiment to investigate allelopathic effects of  O. borgei  culture and mixed cultures ( O. borgei  and  M. aeruginosa ) at different growth phase on harmful microalgae ( M. aeruginosa ). Results showed that  O. borgei  could significantly inhibited  M. aeruginosa  when volume ratios were 4:1 and 1:1 ( M. aeruginosa: O. borgei ) in co-culture experiment. Further, it was found that the membrane system of  M. aeruginosa  was disintegrated by the culture filtrate of  O. borgei  at exponential phase. In addition, esterase activities and photorespiration were significantly inhibited. In conclusion,  O. borgei  exhibited different allelopathic effects at different growth phase. Its exponential phase showed a significant inhibitory effect, while no inhibitory effect was observed at the decline phase.

Allelopathic effect of Oocystis borgei culture on Microcystis aeruginosa