What is often a result of high biochemical oxygen demand (BOD) levels in water?

High biochemical oxygen demand (BOD) levels in water indicate a high level of organic material that microorganisms decompose. As these microorganisms consume the organic matter, they require oxygen for respiration. Elevated BOD levels can lead to a depletion of dissolved oxygen in the water because the microbial activity consumes available oxygen faster than it can be replenished, especially in stagnant water bodies.

This reduction in dissolved oxygen can significantly impact aquatic life, including fish and other organisms that depend on adequate oxygen levels to survive. Low oxygen conditions can lead to stress or even mortality of these organisms, disrupting the aquatic ecosystem. Therefore, understanding the implications of high BOD levels is crucial for maintaining water quality and protecting aquatic habitats.