Аннотация:Ecological Characteristic of a Highly Eutrophic Pond:The Role of Green Algae in EutrophicationAbstract—Patriarch’s Pond is a small water body located within the boundaries of Moscow, where regular andmass blooms of green algae are observed. Various fish species exhibit intermittent spawning throughout the sum-mer, and young fish of different sizes are consistently present in the pond, primarily consuming large zooplanktonindividuals. This predation results in a shift in the size structure of the zooplankton population toward smallerspecies. A total of twenty-three zooplankton species have been recorded in the pond, with rotifers being the mostabundant. Phytoplankton analysis revealed the presence of 106 species of algae and cyanobacteria, with greenalgae comprising 67 species.Keywords: eutrophic water body, green algae, mineral phosphorus, total nitrogen, pond ichthyofauna,zooplankton