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What is oxygen sag?

Updated: 4/28/2022
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14y ago

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Oxygen sag is a dip in the amount of dissolved oxygen in a body of water. This can be caused by several things, ranging from a drop in water flow to an increase in waste in the water.

Occasionally when waste is introduced into a body of water, bacteria will begin to consume the waste. As they consume the waste, the bacteria use up oxygen, causing the overall amount of oxygen in the water to drop. In some cases, the waste itself will consume oxygen without an bacteria.

Oxygen sag can lead to massive die-offs of oxygen-breathing aquatic creatures, such as fish, crustaceans and mollusks.

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14y ago
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