Algae growth in water bodies is a common environmental concern, as excessive proliferation can lead to harmful algal blooms (HABs) that disrupt aquatic ecosystems and pose health risks to humans and animals. Preventing algae growth requires a multifaceted approach that addresses the underlying causes and implements effective control measures. One primary factor contributing to algae growth is nutrient pollution, particularly from phosphorus and nitrogen. These nutrients often enter water bodies through agricultural runoff, wastewater discharge, and stormwater. To mitigate this, implementing best management practices (BMPs) in agriculture is essential. Farmers can adopt measures such as strip tillage and cover cropping to reduce fertilizer runoff, as these practices help retain nutrients in the soil, preventing them from leaching into nearby water bodies. For instance, efforts in the Lake Erie basin have focused on reducing phosphorus input by 40% by 2025 through such agricultural practices, aiming to curb the occurrence of HABs. In urban areas, managing stormwater runoff is crucial. Installing green infrastructure, like rain gardens and permeable pavements, can help absorb and filter runoff, reducing the amount of nutrients reaching aquatic systems. Additionally, upgrading wastewater treatment facilities to remove more nutrients before discharge can significantly impact algae prevention. Physical methods of algae control include aeration and mechanical removal. Aeration increases the oxygen levels in water, disrupting the conditions that favor algae growth. Mechanical removal involves physically extracting algae from the water, which can be effective for small-scale blooms but may not be feasible for larger bodies of water. Biological controls involve introducing or promoting organisms that consume algae. For example, certain species of fish and invertebrates feed on algae, helping to keep its growth in check. However, this method requires careful consideration to avoid disrupting the existing ecosystem balance. Chemical treatments, such as algaecides, can provide immediate results in controlling algae. However, they should be used judiciously, as they can have unintended consequences on non-target species and may lead to the development of resistant algae strains. Moreover, chemical treatments do not address the root cause of nutrient pollution and thus are not a sustainable long-term solution. Emerging technologies offer innovative approaches to algae prevention. Nanobubble technology, for instance, introduces ultra-fine bubbles into the water, increasing oxygen levels and disrupting algae's ability to thrive. This method has shown promise in various settings, including ponds and lakes, by enhancing water quality without the adverse effects associated with chemical treatments. Public education and community involvement are also vital components of algae prevention. Educating the public about the impacts of over-fertilization, proper disposal of waste, and the importance of maintaining natural vegetation buffers around water bodies can lead to more environmentally conscious behaviors that reduce nutrient pollution. In summary, preventing algae growth in water bodies necessitates a comprehensive strategy that combines nutrient management, physical and biological controls, responsible chemical use, and public engagement. By addressing the root causes and employing sustainable practices, it is possible to mitigate the occurrence of harmful algal blooms and protect aquatic ecosystems.