From personal observation with placing duckweed in water features as a start-up water conditioner.
Hard rain kills duckweed. Rain will bruise/damage the leaves, killing it in a few days.
Waves do the same thing, beating the leaves against the shoreline kill it.
Well, most of it, the few survivors will continue to reproduce.
Having some duckweed would be good for the water and fish, too much could be a problem.
So, one option to manage the plant in a small pond with trout is to hook up a pump to a large sprinkler.
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Alberta Fish and Wildlife Outdoor Recreation Policy -
"to identify very rare, scarce or special forms of fish and wildlife outdoor recreation opportunities and to ensure that access to these opportunities continues to be available to all Albertans."
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