Dissolved Oxygen is the amount of oxygen dissolved in a body of water which reflects the health of the water and its' ability to support aquatic life.
To conduct a dissolved oxygen test, first you take the glass with the chemicals in it out of the package. Then you get a water sample in the beaker, followed by breaking the tip of the glass at the bottom of the beaker to release the chemicals into the water. After that, the chemicals in the glass will turn a different color, and you compare that color to the colors on the package to determine the level of dissolved oxygen.
Some fish can live with dissolved oxygen levels of only 5 ppm, like warm water fish, but other fish need higher levels of oxygen than that, 6-7 ppm. The oxygen level in my ecosystem is 10 ppm. In a small pond the levels might be around 8 ppm, while a large river might be around 10 ppm.
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