Which condition may arise due to low dissolved oxygen levels in water?

Low dissolved oxygen levels in water can lead to fish kills, which occurs when aquatic organisms, particularly fish, are unable to obtain enough oxygen to survive. Dissolved oxygen is crucial for the respiration of fish and other aquatic life. When oxygen levels drop below a certain threshold, fish can experience stress, suffocation, or even death. This condition may arise due to various factors, including nutrient pollution, which can lead to increased organic matter decomposition and the subsequent consumption of oxygen by aerobic bacteria, ultimately decreasing the availability of dissolved oxygen for fish.

The other conditions mentioned, while they can occur in aquatic environments, do not directly stem from low dissolved oxygen levels. For instance, blooms of algae often occur in nutrient-rich waters but are typically associated with high levels of nutrients rather than low oxygen. Similarly, freezing of water pertains more to temperature conditions than to dissolved oxygen concentrations, and increased turbidity relates to sediment and particulate matter in the water rather than directly to oxygen levels. Thus, the primary and most direct consequence of low dissolved oxygen is the potential for fish kills.