What actually caused fish death if algae were not toxic


1) What is the effect of discharging primary-treated sewage on the BOD and dissolved O2 (DO) of the receiving body of water? What is the effect of secondary-treated sewage on the BOD and DO?

2) A newspaper headline reported "Algal Bloom Kills Fish."

a. What actually caused fish death, given that the algae were not toxic?

b. What could have caused the algal bloom?

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Biology: What actually caused fish death if algae were not toxic
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