Eutrophication can lead to decreased dissolved oxygen in a body of water. This often results in

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In some developing nations the percentage of the animal protein from fish in the diet can be as high as 25 percent.  about 85% of fish caught is used for human consumption.  the remainder is converted into fishmeal and fish oil. 

The reactants are co_{2} aka carbon dioxide and h_{2}o aka water along with light energy