What is one potential consequence of nutrient pollution from aquaculture?

Nutrient pollution from aquaculture primarily occurs when excess nutrients, such as nitrogen and phosphorus, enter the aquatic environment. These nutrients often originate from fish waste, uneaten feed, and fertilizers used in aquaculture operations. When nutrient levels are elevated, it creates an ideal environment for the rapid growth of algae in a phenomenon known as algal blooms.

Algal blooms can significantly alter aquatic ecosystems. They can deplete oxygen levels in the water as the algae die and decompose, which can lead to hypoxic conditions that harm or kill fish and other aquatic life. Additionally, some algal blooms can produce toxins that are harmful to both aquatic organisms and humans. Therefore, the result of increased nutrient pollution is primarily associated with the occurrence of algal blooms, making it the correct answer to this question.

The other options do not relate appropriately to the impacts of nutrient pollution. For example, decreased water temperatures and improved water clarity are generally not consequences of nutrient pollution. Increased fish population may occur in some cases with enhanced nutrient availability, but this is overshadowed by the negative effects that algal blooms bring to the overall ecosystem health.