Method for jointly controlling growth of grass type clean water state system tillering filamentous algae by utilizing snails and fishes

The invention discloses a method for jointly controlling growth of grass type clean water state system tillering filamentous algae by utilizing snails and fishes. The method comprises the following steps: A, investigating the density of snails in a water body at the initial stage of rebuilding submerged plants in a eutrophicated lake; b, controlling the biomass of the filamentous green algae by grazing the snails: putting the bellamya until the total density of the snails reaches a certain amount, and controlling the overgrowth of the filamentous green algae by utilizing the bellamya; c, utilizing the crucian to eat snail eggs and young snails, regulating and controlling the snail quantity and keeping water ecological balance: investigating the quantity of fishes such as the crucian which eat the snails and snail eggs in the water body, and supplementing and putting the crucian to a certain amount; d, artificially catching the crucian carps and regulating and controlling the number of the crucian carps, regul