The allelopathic effects between Pseudanabaena mucicola and Microcystis aeruginosa which were seperated from Shanzai reservoir were studied by the methods of co-culture and cell-free filtrate addition. In the co-cultured experiment,the allelopathy was explored under the condition of regular culture,nutrition-limitation and light-limitation. The results show that the cell-free filtrate of Microcystis aeruginosa can stimulate the growth of Pseudanabaena mucicola.,and the stimulation was increasing as the conc...