Fish-mussel-algae-bacteria model remedied eutrophication pollution: Application in Dongxiang district reservoir

Eutrophication pollution has become an important ecological problem in China. Biological treatment is a common means to repair eutrophication pollution. Therefore, based on the biological manipulation technology, we put forward a fishing scheme for the Xiaoxiangshan and Shizishan reservoirs in Dongxiang District, which have been in a serious eutrophication pollution level for a long time, that is, to improve the quality and control water by operating fish, mussel, algae, and bacteria. The monitoring results in the middle stage of treatment showed that the structure of phytoplankton changed, and the degree of eutrophication pollution improved. In the later stage of treatment, the plankton diversity and richness of the two reservoirs increased significantly, the density and biomass of Cyanobacteria decreased significantly, and the degree of eutrophication pollution decreased to mesotrophic type. Overall, our research puts forward new ideas for the prevention and control of water eutrophication pollution and provides a reference for other kinds of water body treatment. [Display omitted] •Water quality of reservoir improved after treating the water using fishing scheme.•Nitrogen and phosphorus in water has been reduced, and improve water transparency.•Cyanobacteria is reduced to 0.01 mg/L and curb the growth of algal blooms.•Fish-Mussel-Algae-Bacteria system improved water, and promote aquaculture industry.