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https://www.usgs.gov/special-topic/water-science-school/science/dissolved-oxygen-and-water
Oct 22, 2019 · Dissolved Oxygen and Water. Although water molecules contain an oxygen atom, this oxygen is not what is needed by aquatic organisms living in natural waters. A small amount of oxygen, up to about ten molecules of oxygen per million of water, is actually dissolved in water.
https://www.water-research.net/index.php/dissovled-oxygen-in-water
A trout needs five to six times more DO when the water temperature is 24 degrees C (75 degrees F) as compared to when the water temperature is 4 degrees C (41 degrees F). The increased DO is needed to support an increase in metabolic rates - a phenomenon shared by other cold-blooded aquatic animals.
http://www.actforlibraries.org/how-sunlight-oxygen-and-temperature-contribute-to-aquatic-life/
Fish and other aquatic organisms will die without the appropriate level of oxygen such as levels below three to five parts per million (ppm). Decreasing levels of oxygen are due to the lack of photosynthesis caused by the decreasing filtering of sunlight in the middle and lower depths.
https://www.thepondreport.com/aeration-oxygen-transfer.shtml
For the creatures of the Earth that inhale and breathe air a level of oxygen that is around 21 percent is required to support life but in ponds, lakes and aquaculture waters aquatic life is often supported in water that contains less than 0.0001 percent oxygen, which is equal to 10 mg/l.
https://www.deq.virginia.gov/Portals/0/DEQ/Water/WaterQualityMonitoring/CitizenMonitoring/Chemical_Monitoring.pdf
oxygen levels) <0.5 mg/l - Anoxia Occurs (lack of dissolved oxygen) Level needed to support most aquatic life. Aquatic organisms may become stressed. Mobile organisms will move to areas of higher dissolved oxygen and immobile species may die. Waters cannot support most aquatic life. Table 4-2. Virginia Water Quality Standards for Dissolved Oxygen
https://www.fondriest.com/environmental-measurements/parameters/water-quality/dissolved-oxygen/
The amount of dissolved oxygen needed varies from creature to creature. Bottom feeders, crabs, oysters and worms need minimal amounts of oxygen (1-6 mg/L), while shallow water fish need higher levels (4-15 mg/L)⁵. Microbes such as bacteria and fungi also require dissolved oxygen.
https://www.answers.com/Q/Does_aquatic_life_need_light_and_oxygen
Land animals get the oxygen they need from the atmosphere. Most aquatic organisms get oxygen dissolved in the water in which they live, and others, like alligators and crocodiles, get oxygen …
https://floridadep.gov/sites/default/files/tsd-do-criteria-aquatic-life.pdf
Dissolved oxygen in our waterways is necessary to support respiration of aquatic biology that live in Florida waters. As with humans, aquatic species also require oxygen. The Department sets dissolved oxygen levels to ensure that there is enough oxygen in our waterways to allow growth and reproduction of Florida aquatic species.
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