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.
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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1 Answer
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Excessive phytoplankton (organic pollutants such as leaves, grass trash etc.) present in water are biodegradable. Bacteria decompose these organic matters in water. During this process, when a large number of bacteria decompose these organic matters, they consume the dissolved oxygen in water. When the level of dissolved oxygen falls below 6 ppm the fish cannot survive.
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