In temperate lakes, fall blooms are occasionally followed by fish kills.

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Fall blooms, also known as autumnal turnovers, occur when the surface water of a lake cools down, becomes denser, and sinks to the bottom, bringing oxygen to deeper layers of the lake. This can cause nutrients and organic matter from the bottom sediments to be stirred up and brought to the surface, leading to an increase in algae growth. However, when this algae growth dies off, it can consume a large amount of oxygen as it decomposes, leading to low oxygen levels in the water. This can cause fish and other aquatic organisms to suffocate and die. Therefore, in some cases, fall blooms can be followed by fish kills.

In Temperate Lakes, Fall Blooms Are Occasionally Followed by Fish