Oxidation-Reduction Potential (ORP) - Gov
environment for fish or bugs. In healthy waters, ORP should read high between 300 and 500 millivolts. In the North, we might expect low ORP in waters that receive sewage inputs or industrial waste. How do we measure oxidation-reduction potential? ORP is measured directly in the lake or river water that you are investigating using an ORP sensor.
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Dissolved Oxygen (DO)
www.enr.gov.nt.cawater, fish and other animals may suffocate and die. For example, oxygen cannot enter the water when it is covered in ice, so fish can often suffocate towards the end of the winter. The chances of winter fish kills are even higher if the fish are living in a polluted or overgrowing (overproductive) system.
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