Why does the strong “bloom” of water often lead to fish freezing and death of other inhabitants of the reservoir?

1) After rapid reproduction, the plants die, and when rotting, the oxygen of the reservoir is used.
2) This leads to oxygen starvation and the death of its inhabitants.
3) Some blue-green algae emit toxic substances during oxygen-free decomposition of organic substances: methane, ammonia, hydrogen sulfide are released, which are harmful to all inhabitants.

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