Question

In intensive aquaculture ponds, dissolved oxygen levels can suddenly deplete in the early morning hours, since phytoplankton and other pond organisms continue respiring and consuming oxygen overnight without any photosynthetic oxygen production. This phenomenon, which can cause mass fish mortality if aeration is not provided, is known as a:

A Dissolved oxygen crash/pond turnover
B Eutrophication
C Biomagnification
D Algal bloom
E Thermal stratification
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