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.

Asked by Abhisek | 1 year ago |  130

1 Answer

Solution :-

Phytoplankton is consumed by bacteria which require dissolved oxygen for this process. Thus, the higher the amount of Phytoplankton, the larger is the use of dissolved oxygen by bacteria to consume Phytoplankton. Thus, all the oxygen in the lake is used up and BOD drops below 6 ppm, suffocating the fish.

Answered by Pragya Singh | 1 year ago

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