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14.18.    A large number of fish are suddenly found floating dead on a lake. There is no evidence of toxic dumping but you find an abundance of phytoplankton. Suggest a reason for the fish kill.

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The abundance of phytoplankton causes the reduction of dissolved oxygen present in water. This is due to the decomposition of phytoplankton by bacteria present in water requires a large amount of oxygen. Hence, they used the dissolved oxygen in the water. Thus the BOD level of water reduced below a certain level, preventing the growth of fish and causing excessive fish-kill.

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manish

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