When abnormally high levels of aerobic bacterial activity takes place, the level of dissolved oxygen can drop dramatically to hypoxic levels, causing Eutrophication.
Eutrophication is the addition of nitrites/ates to aquatic ecosystems forming a bloom in phytoplankton, algae or cyanobacteria.
Under eutrophic conditions, dissolved oxygen greatly increases during the day, but is greatly reduced after dark by the respiring algae and by microorganisms that feed on the increasing mass of dead algae.
When dissolved oxygen levels decline to hypoxic levels, fish and other marine animals suffocate. As a result, creatures such as fish, shrimp, and especially immobile bottom dwellers die off.
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