Understanding Water Oxygen Capacity
- Enter the current Water Temperature in °C.
- Enter the Salinity of the water (ppt).
- Input your Elevation above sea level in meters.
- The calculator will determine the Dissolved Oxygen (DO) Saturation Point (mg/L).
- Check the Context Cards to understand how temperature and pressure affect your results.
Frequently Asked Questions
What is Dissolved Oxygen (DO) Saturation?
DO Saturation is the maximum amount of oxygen that water can hold at a given temperature, salinity, and atmospheric pressure (elevation). It represents the equilibrium state between the water and the atmosphere.
Why does oxygen decrease at higher elevations?
At higher altitudes, the atmospheric pressure is lower. Since Henry's Law states that the amount of dissolved gas is proportional to its partial pressure, lower pressure results in less oxygen being driven into the water.
What is the critical DO level for fish?
For most tropical fish and shrimp, DO levels below 3.0 mg/L are stressful and levels below 1.0–2.0 mg/L are often lethal if sustained. Knowing your saturation point helps you understand how much 'headroom' you have before levels become critical.
How can I increase the oxygen in my pond?
The most common methods include mechanical aeration (paddle wheels, diffusers), increasing water turnover, or adding specialized oxygenating plants (though plants can deplete oxygen at night).
Key Benefits
- Accounts for elevation and air pressure changes
- Salinity-corrected DO calculations
- Helps identify high-risk 'Oxygen Drop' windows
- Essential for high-density aquaculture systems
- 100% private — your project data stays with you
- Fast and mobile-ready for pond-side monitoring