Install aeration.
Reduce fertilizers around the lake. Fence off from cattle. If you can raise the water level that would help.
Poisoning lakes to kill algae or blue green algae just creates a feedback loop of growth, due off, rot, nutrients for the next bloom.
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It is not the most intellectual of the species that survives; it is not the strongest that survives; but the species that survives is the one that is able best to adapt and adjust to the changing environment in which it finds itself. Charles Darwin
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