The physiological and ecological properties of Alexandrium tamarense , a kind of red tide causative alga, and the ecological relationship between this alga and three strains of marine bacteria isolated from Xiamen western sea area were examined in the controlled ecological conditions. A. tamarense can growth well and keep some of its peculiarity when cultured under the laboratory conditions. Its growth curve is as same as that of the general microorganism. Bacteria are not found in the purely cultur...