Silver carp and hyriopsis cumingii combined algae-controlling method

Abstract

The invention relates to a biological combination control technical method of alga growth in eutrophic water bodies; the method is also applicable to water works and water source plants for controlling alga in source water. Chub and hyriopsis cumingii are bred in the eutrophic water bodies by the method; density of the chub in the eutrophic water bodies is 45 to 95 g / m<3>, and weight per chub is 90 to 300g; density of the hyriopsis cumingii in the eutrophic water bodies is 40 to 70 g / m<3>, and weight per hyriopsis cumingii is 50 to 450g. Compared with the existing alga control method, the invention has the advantages of low cost, simple operation, lasting effect, having no secondary pollution and no ecological risks caused by invasive species. Meanwhile, some nutritive salts are taken out of the water bodies by harvesting chubs and hyriopsis cumingiies, and certain economic benefits can be produced.

Description

technical field [0001] The invention relates to a technical method for jointly controlling the growth of algae in eutrophic water bodies, which can also be used for controlling algae in water sources in waterworks. Background technique [0002] The algal blooms caused by eutrophication of water bodies have become a problem that plagues many lakes and reservoirs in my country, especially for water sources. Excessive algae concentrations in water bodies not only cause damage to local ecosystems, but also cause damage to downstream water plants. Water treatment poses a huge burden. At present, the methods of algae control at home and abroad mainly include: (1) chemical method: such as adding chemical agents to remove algae; (2) physical method: such as mechanical algae removal, dredging sediment, dilution and washing, etc.; Plant large aquatic plants, release microbial agents, biological manipulation, etc. Among these methods, the chemical method is quick to remove algae, but ...

AI Technical Summary

Problems solved by technology

Among these methods, the chemical method is quick to remove algae, but the use of chemicals is easy to cause secondary pollution and residual effects

Physical methods are often time-consuming and costly

Among the biological methods, the planting of aquatic plants may cause the invasion of alien species, such as water hyacinth, which is difficult to control, while the recovery rate of indigenous aquatic plants in eutrophic water bodies has not been high; the use of microbial agents to control algae has certain health risks and ecological risk

The classic biological manipulation method adopted abroad removes zooplankton-eating fish from the water body by feeding carnivorous fish or manual fishing, so as to increase the population of zooplankton in the water body to control the level of algae. However, the success rate of this method is not high. Especially in large water surface and deep water body, the effect is not obvious

The more non-classical biological manipulation method used in China is to control algae by stocking silver carp and bighead carp and other filter-feeding fish directly to filter algae in water. The rapid growth of small algae often makes the total level of algae and chlorophyll concentration in the water body higher than before treatment