The primary result of eutrophication in aquatic ecosystems is the excessive growth of algae, often referred to as algal blooms. This phenomenon occurs when nutrient runoff, especially nitrogen and phosphorus, enters water bodies, promoting algae proliferation. While this might initially seem beneficial, the subsequent algae die-off depletes oxygen levels in the water, leading to hypoxia and creating dead zones where aquatic life cannot survive. Eutrophication disrupts ecosystem balance, affects fish populations, and can produce toxins harmful to both wildlife and humans, ultimately deterring recreational activities and impacting water quality.