What is the relationship between dissolved oxygen content and fish populations in the body of water?

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Dissolved oxygen represents the oxygen gas that is dissolved in water. Fish and other aquatic species need this oxygen for their survival. Fish have specific organs for this purpose. 

From the given data, we can see that dissolved oxygen (DO) is necessary for fish. At 0 ppm DO concentration, there...

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Dissolved oxygen represents the oxygen gas that is dissolved in water. Fish and other aquatic species need this oxygen for their survival. Fish have specific organs for this purpose. 

From the given data, we can see that dissolved oxygen (DO) is necessary for fish. At 0 ppm DO concentration, there are no fish. In fact, even at 2 ppm DO level, there is only 1 fish. The fish population starts increasing beyond a DO level of 4 ppm, reaching a maximum value of 15 at 12 ppm DO. There is an increasing trend in the fish population up to a DO value of 12 ppm; then it falls and then rises again. 

In general, DO is necessary for fish survival and a minimum value of about 6 ppm is required for a significant fish population. 

Hope this helps. 

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