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Key Features
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| Pet Care Type: |
Containment |
| Pet Type: |
Fish |
| Aquariums, Habitats and Accessories: |
Live Plant Care · Test Kits |
| Containment Type: |
Aquariums and Habitats |
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Miscellaneous
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| Product ID: |
29624433 |
| More Information |
| Details: |
Introduction to Oxygen The gas Oxygen (O2) comprises of approximately 21% of the volume of air and is vital for the existence of life on earth. Together with carbon dioxide (CO2), oxygen forms the closed cycle of gas exchange between plants and animals. Through contact with the air and the photosynthetic activity of green water plants, oxygen dissolves in water. The maximum amount that can dissolve (the saturation level) depends on the temperature and salinity of the water. The warmer the water and the higher the salinity, the lower the saturation level. Cold freshwater is therefore considerably richer in oxygen than warm seawater. The saturation levels for several temperatures and salinities are given in the following table. If the level of dissolved oxygen decreases below a certain critical level, fishes and other aquatic animals will suffer from oxygen deficiency, eventually leading to suffocation. Since aquatic animals require more oxygen at high temperature and at the |
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