Why is it critical to monitor the level of dissolved oxygen in water?

All aquatic organisms – not just fish, but any aquatic invertebrates and plants, need dissolved oxygen to respire aerobically. Reduced DO (dissolved oxygen) levels cause stress, stunted growth, and eventually mortality. If you wish to know the quality of the water, DO is a key indicator of that quality. High levels of organic pollution – […]

Healthy water for brown trout

Dissolved Oxygen: Brown trout require a Dissolved Oxygen (DO2) of 9mg/l or higher for a healthy population. 6mg/l is the short term lower boundary and anything below this creates stress on the fish.  Below 3mg/l is lethal for brown trout – they asphyxiate through lack of oxygen. Temperature: In terms of temperature, fish generally don’t modify […]