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Dissolved oxygen
From The Aquarium Wiki
Dissolved Oxygen (O2) (mg/L). The amount of oxygen currently dissolved in a body of water.
This gas is constantly entering water from two main sources: the atmosphere and from photosynthesis.
Dissolved oxygen concentrations can be determined by conducting a series of complex chemical reactions via a 'test kit' or by measuring electronically with an oxygen meter (a.k.a. a DO meter).
Note: Some species of fish require a minimum high level of DO to survive.
- A beaker of sterile freshwater left to stand at 25C will hold a maximum of 8.2mg/L of Oxygen (this is said to be 100% saturated).
| Temp °C | freshwater | saltwater |
|---|---|---|
| 0 | 14.6 | 11.7 |
| 5 | 12.8 | 10.4 |
| 10 | 11.3 | 9.3 |
| 15 | 10.1 | 8.5 |
| 20 | 9.1 | 7.8 |
| 25 | 8.2 | 7.1 |
| 30 | 7.5 | 6.5 |
- A level of 7+mg/L is considered high.
- A level of 5-6mg/L is considered to be normal.
- A level of 4mg/L is considered low and getting potentially deadly.
[edit] Links
- A Beginner's Guide to Water Management - Oxygen and Temperature
- Levels of dissolved Oxygen in the aquarium by the OATA
