What is a common consequence of algal blooms in freshwater lakes?

Algal blooms in freshwater lakes often lead to decreased oxygen levels in the water, which can have severe impacts on aquatic life. As algal populations grow rapidly, they consume significant amounts of nutrients, primarily nitrogen and phosphorus, which can initially cause a surge in productivity. However, when the blooms eventually die off, the decomposition of the algae by bacteria uses up a considerable amount of dissolved oxygen in the water. This process can create hypoxic (low oxygen) or anoxic (no oxygen) conditions, making it difficult or even impossible for fish and other aquatic organisms to survive. In some cases, this can even lead to fish kills and a decline in species diversity, demonstrating the severe ecological consequences of algal blooms.