Pond turtles and duckweed.


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We have just acquired a ranch with 2 fairly large ponds that are covered with duckweed. There also are quite a few large (6-10") turtles living in it. I think there may be some fish in it also. Is there something we could use to kill the duckweed without harming the turtles or fish? We also see herons sitting on the log. We are in Zone 5 or 6 in Oregon. Thanks in advance.
 

addy1

water gardener / gold fish and shubunkins
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Welcome to our group!

This is from the web:

Biological Duckweed Control Add natural predators of duckweed, such as Koi, grass carp, goldfish and domesticated waterfowl. Alone these biological controls cannot remove the problem, but if introduced to the pond before duckweed begins to grow, they can assist with duckweed control. Get rid of duckweed before it takes over the pond by increasing aeration at the bottom, manually removing plants from the surface and reducing nutrients that create bottom sediment. Try a combination of these methods before resorting to chemical duckweed control.

Read more at Gardening Know How: Controlling Duckweed – How To Kill Duckweed https://www.gardeningknowhow.com/plant-problems/weeds/duckweed-control.htm
 
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the extreme would be something in this idea
 
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Not sure how big your ponds are but vigorous aeration is helpful. If the ponds are not too large, you can use a leaf blower and a swimming pool net. Have someone hold the net and blow & corral the stuff. Toss the duckweed into a compost pile. Start the aeration after you skim off most of the duckweed. Goldfish also devour it. Doing the above is environmentally sound. By the way, welcome to the forum!
Stephen
 
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