The Hazards of Low Dissolved Oxygen in Water

Dissolved Oxygen (DO) refers to the amount of gaseous oxygen (O₂) that is dissolved in water. It is a crucial measure of water quality, as it is essential for the survival of most aquatic life forms, including fish, invertebrates, and bacteria.

Oxygen enters water primarily through direct diffusion from the surrounding air and as a byproduct of photosynthesis from aquatic plants and algae.

Dissolved oxygen (DO) is essential for the survival of aquatic ecosystems. When its levels drop too low, numerous serious consequences can occur.

Firstly, aquatic life is severely affected. Fish and other organisms struggle to breathe, leading to stress, reduced growth, and mass mortality events. This loss of biodiversity disrupts the entire food chain.

Secondly, low DO promotes the growth of anaerobic bacteria, which produce harmful substances like hydrogen sulfide and methane. These compounds degrade water quality, create foul odors, and make the water unsuitable for recreation or consumption.

Additionally, low oxygen levels can cause the release of pollutants from sediments, further contaminating the water. This can harm both wildlife and human health, especially if the water is used for drinking.

In summary, maintaining adequate dissolved oxygen is critical for sustaining healthy water ecosystems, supporting biodiversity, and ensuring water safety for human use. Reducing pollution and protecting natural habitats are key to preventing these dangers.