What affects the level of dissolved oxygen in water?
The level of dissolved oxygen in a body of water can vary from hour to hour. The level falls as fish remove oxygen molecules from the water with their gills. The more fish in the water, the more dissolved oxygen they remove. Fish are cold-blooded, so their body systems work more slowly in cold water and speed up in warm water. The warmer the water, the more oxygen their body systems require. Plants in the water, including the tiny floating phytoplanktonMicroscopic aquatic plants that live suspended in the water., also use small amounts of the dissolved oxygen for respirationThe physical process that supplies oxygen to living cells and the chemical reactions that take place inside the cells.. Photosynthesis requires…
