dissolved oxygen (DO)

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Amount of oxygen dissolved (and hence available to sustain marine life) in a body of water such as a lake, river, or stream. DO is the most important indicator of the health of a water body and its capacity to support a balanced aquatic ecosystem of plants and animals. Wastewater containing organic (oxygen consuming) pollutants depletes the dissolved oxygen and may lead to the death of marine organisms.

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When you are going to go fishing find a lake that is filled with dissolved oxygen and the fish should be much healthier.
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Background Information dissolved oxygen (DO) is essential to healthy streams and lakes. The dissolved oxygen level can be an indication of how polluted the water is and how well the water can support aquatic plant and animal life. Generally, a higher dissolved oxygen level indicates better water quality. If dissolved oxygen levels are too low, some fish and other organisms may not be able to survive. Much of the dissolved oxygen in water comes from oxygen in the air that has dissolved in the water. Some of the dissolved oxygen in the water is a result of photosynthesis of aquatic plants. On sunny days, high DO levels occur in areas of dense algae or plants due to photosynthesis. Stream turbulence may also increase DO levels because air is trapped under rapidly moving water and the oxygen from the air will dissolve in the water. Water temperature also affects DO levels. Colder water can hold more oxygen in it than warmer water. A difference in DO levels may be seen at the test site if
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Dissolved oxygen was present in the readings taken after the scientific experiment. I was pleased to see such a hospitable environment for life.
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