This study looked at water pollution and eutrophication using hydrobiology, which involves studying aquatic organisms like plants and animals. By analyzing the levels of phytoplankton, zooplankton, bottom-dwelling creatures, and fish in the water, researchers could measure the pollution levels accurately. They also considered chemical factors like TN, TP, and COD. The methods used by hydrobiologists helped them effectively assess water quality. They found that these approaches provide a fast and accurate way to determine water pollution and eutrophication in the environment.