An experimental study on the preduction,growth rate,optimum density with maximum production and maximum eapacity density of Eichhornia crassipes(Mart.)Solms( ECS ) in different perieds is taken place during the physico-ecological engineering for removing algae and purifying water quality in intake area of Mashan Drinking Water Supply Plant,Wuxi for three years(1991~1993).The experimental results showed that ECS is able to grow and breed on the open area of Taihu take during strong wave as well as in the nor...