Low Dissolved Oxygen

What this symptom may mean

Warm water, high biomass, organic decomposition, stratification and inadequate gas transfer or circulation can reduce DO.

Information and testing priorities

• Measure DO and temperature by depth, location and time, especially before sunrise; record biomass, feeding, BOD or organic loading where relevant.

Responsible treatment pathway

• Emergency aeration or oxygen may be necessary. A designed Nano Bubble oxygenation and circulation system can support longer-term management after demand and hydraulics are understood.

Urgency

Urgent when fish or animals show distress.

What to send Puroxi

• Complete laboratory report and sampling date
• Source, intended use, volume, flow and photographs
• History of the symptom and existing equipment or treatment
• Required outcome and any applicable health, animal, process or discharge requirements

Important technical notice

Possible causes are not a diagnosis. Do not use this page to declare water safe, prescribe a chemical dose or delay emergency, health, veterinary or regulatory action. Testing and site-specific review are required.