What are the causes for Hypoxia?
A. Plant nutrients entering river, lake and oceans during Eutrophication result in Phytoplankton blooms. Dense population of phytoplankton bloom reduces Dissolved Oxygen during night by respiration
B. With no support from dissolved Oxygen, phytoplankton cell die, sink towards bottom and later decomposed by bacteria. Fish and certain invertebrates like crabs and clams on bottom are killed by hypoxic conditions
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