Over run with Duckweed.


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My fishpond is currently over run with Duckweed. Is there an additive I can buy that will kill it off without endangering the fish please?
 
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You apparently don't have a koi . I take it your pond is on the smaller side?
 
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Welcome to the forum!
Yes. But I wouldn't use any for a garden pond especially if you have fish. Keyword 'Duckweed control' or 'Lemna' control. I agree with @GBBUDD, use fish. Goldfish will devour the stuff. There are all sorts of ways to deal with it depending on your pond's size and other factors. How many gallons is your pond? Do you have fish?
 

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My fishpond is currently over run with Duckweed. Is there an additive I can buy that will kill it off without endangering the fish please?
Especially if your pond is small, it'll take you a whole 5 minutes to net it all out. Easy peasy. Had a 1000 gallon pool for overwintering and it was completely covered with duckweed by the time spring came (damn turtles; don't they know it's there for THEM??). Netted it out, threw it into the pond outside, in 3 days, it was completely gone. Wouldn't have taken THAT long if I'd done it in summer...
 

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@alshookup

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I just took a bunch of duckweed out of my fish free little wildlife pond yesterday. I just used a long bamboo stick and stuck it in the duckweed and wound the stick around it and pulled it out and took it to my big pond w/fish and they will suck it up in no time till every morsel is gone. I have goldfish only. Wonder why your fish don't eat it up? Anyways if you just keep pulling it out eventually you will either have it all gone or under control as long as you keep on top of it.
 

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View attachment 143031@alshookup

View attachment 143033
I just took a bunch of duckweed out of my fish free little wildlife pond yesterday. I just used a long bamboo stick and stuck it in the duckweed and wound the stick around it and pulled it out and took it to my big pond w/fish and they will suck it up in no time till every morsel is gone. I have goldfish only. Wonder why your fish don't eat it up? Anyways if you just keep pulling it out eventually you will either have it all gone or under control as long as you keep on top of it.
do you have some sort of spreadsheet, or just a very very good memory of just what ani-gifs you have????? @j.w
 
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j.w

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All organized by category and then some! I can easily find what I want in other words
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I agree that skimming out any extra Duckweed (Lemna spp.) is the way to go. However it will likely decrease on its own anyway as Fall gives way to Winter.

If you do skim it out, use it as mulch or compost in your garden beds.
 
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View attachment 143031@alshookup

View attachment 143033
I just took a bunch of duckweed out of my fish free little wildlife pond yesterday. I just used a long bamboo stick and stuck it in the duckweed and wound the stick around it and pulled it out and took it to my big pond w/fish and they will suck it up in no time till every morsel is gone. I have goldfish only. Wonder why your fish don't eat it up? Anyways if you just keep pulling it out eventually you will either have it all gone or under control as long as you keep on top of it.
Me thinks that's the most twisted emoigi you've shared yet
 
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It's crazy while my buddies and I stopped for a bite we sat at the. Bar when I got the most bizarre request ever. This well I belive he cled himself a guy came up to me and asked if he could get his girl friend in my bar stool so he could take a pic of her with this horrible plaster bust of Elvis it realy was that bad. And here you are with creepy Elvis number 2 in one day.. worst part is neither beat the fool that asked me to be in the pic with his gf .
 
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Thanks to all who replied. It is only a small pond with a few Goldfish/Rudd and of varying sizes. I also have plants including Lillies which mean it is almost impossible to scoop out the Duckweed which gets amongst the leaves. If left a couple of days it seems to spread rapidly. I know you can buy a chemical additive for the Duckweed problem but don't know if it works.
 

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Thanks to all who replied. It is only a small pond with a few Goldfish/Rudd and of varying sizes. I also have plants including Lillies which mean it is almost impossible to scoop out the Duckweed which gets amongst the leaves. If left a couple of days it seems to spread rapidly. I know you can buy a chemical additive for the Duckweed problem but don't know if it works.
if you take a rake in one hand and pull the lily leaves out of your way, then take the net in your other hand and get the duckweed. Not that hard. There's not going to be a chem that affects the duckweed and DOESN'T the lilies...
 
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That was my concern. Worried whether an additive would be less than desirable. Thanks for advice. Does the Duckweed sink to the bottom in winter or just die off?
 

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The duckweed I have in another tub pond just sits there on top of the water here but we don't get very cold in the winter. Sometimes tho it will freeze and get ice on top solid for a few days but duckweed is back after that and looking fine. Since your pond is not very big then I think you can just drag it out and keep doing that whenever you can and keep it under control that way. I would never add chemicals to my ponds, just not worth the risk of throwing your whole pond off balance.
 
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The duckweed I have in another tub pond just sits there on top of the water here but we don't get very cold in the winter. Sometimes tho it will freeze and get ice on top solid for a few days but duckweed is back after that and looking fine. Since your pond is not very big then I think you can just drag it out and keep doing that whenever you can and keep it under control that way. I would never add chemicals to my ponds, just not worth the risk of throwing your whole pond off balance.
Thanks for advice.
 

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Just increase surface agitation. With enough movement, it'll be gone in no time.
Must be another reason besides just my fish eating it as I have pretty good agitation going on in my big pond. It always disappears fast!
 
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Me thinks that's the most twisted emoigi you've shared yet
Who me? Well as I'm relatively a newby to ponds I relish any info that could be useful to enhance the quality of life to the inhabitants of the new world I've created for them.
This duckweed that is being mentioned, is that the string alea kind, which is thread like when pulled at?
I've been putting off clearing mine out of my little 300gal pond, thinking the fish may appreciate it, and fine debris was getting, caught in it, but this evening I finally got to check on my fish and to my horror 1 of the orandas was snagged by the weed which was being drawn into the waterfall pump, No one gave me the heads up on the vaunerability of little oranders in small ponds with string algea, maybe I should post a comment on the newbys section, if string algea is the correct term lol
 

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