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Duckweed
#13631866
07/15/20 07:40 PM
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Joined: Mar 2010
Posts: 1,972
thrashfish
OP
Extreme Angler
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OP
Extreme Angler
Joined: Mar 2010
Posts: 1,972 |
How do I get rid of this in a small pond short of draining it and starting over?
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Re: Duckweed
[Re: thrashfish]
#13632295
07/16/20 12:57 AM
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Joined: Apr 2009
Posts: 2,752
Outdoordude
Extreme Angler
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Extreme Angler
Joined: Apr 2009
Posts: 2,752 |
Herbicides with active ingredients bispyribac sodium, fluridone, penoxsulam, or flumioxazin (in rough order of cheapest to most expensive options) will kill it. May need to reapply to keep it under control through the end of the year.
20 lbs of tilapia per acre can work if there aren't lots of largemouth.
65 lbs of goldfish per acre can work if there aren't lots of largemouth.
The root of the problem is excessive phosphorous so it'll keep coming back until that's addressed. You can use phosphorous binders, phoslock is an expensive but well known example, aeration especially down at the pond bottom, and apparently some of the muck-clearing bacteria treatments do actually help to my surprise (but they work best when combined with aeration - they're mostly aerobic bacteria). Alum can bind nutrients but it's not as widely accepted for that purpose, it's more of a clay/mud clearing tool. And, you can drain the pond, dredge the sediment/sludge out and start fresh and new. Duckweed is one of the tough ones to deal with.
Scott Jones
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Re: Duckweed
[Re: thrashfish]
#13633134
07/16/20 06:25 PM
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Joined: Mar 2010
Posts: 1,972
thrashfish
OP
Extreme Angler
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OP
Extreme Angler
Joined: Mar 2010
Posts: 1,972 |
Thank you for the advice!
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Re: Duckweed
[Re: Outdoordude]
#13636071
07/19/20 04:28 PM
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Joined: Jan 2018
Posts: 306
Marc-62
Angler
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Angler
Joined: Jan 2018
Posts: 306 |
Great advice, I have a question 20 lbs of tilapia per acre is that 20 1lb fish or fingerlings. Same question with goldfish .
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Re: Duckweed
[Re: Marc-62]
#13636104
07/19/20 05:11 PM
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Joined: Mar 2014
Posts: 404
DarrellSimpson
Angler
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Angler
Joined: Mar 2014
Posts: 404 |
From my understanding when getting this kind of advice on the Pond Boss forum 1 lb of fish represents a single 1 lb or 1 lb of smaller fish . Though sometimes the advice for fingerlings will change depending on the what is already established in the body of water that will possibly feed on what ever fits in their mouth . When getting advice on grass carp the advice for minnows gets more lbs per acre because of attrition .
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Re: Duckweed
[Re: thrashfish]
#13637053
07/20/20 03:13 PM
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Joined: Apr 2009
Posts: 2,752
Outdoordude
Extreme Angler
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Extreme Angler
Joined: Apr 2009
Posts: 2,752 |
Derrell's got it. You get more bang for your buck with fingerlings but they are at higher risk of predation. Your nearest hatchery or fish truck delivery route may not have size options on the species you're trying to stock so if all they have is small fingerlings and you have lots of hungry bass in the pond you should probably stock a bit heavier to compensate for predator loss.
Also, remember on tilapia that they will probably die in the winter (less than about 55 F degrees is lethal to them) so you'll have a couple weeks of fish kill to look at in winter and you'll need to restock them in the spring if you want their service to continue next year.
Scott Jones
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Re: Duckweed
[Re: thrashfish]
#13637207
07/20/20 05:20 PM
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Joined: Sep 2007
Posts: 166
gillom
Outdoorsman
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Outdoorsman
Joined: Sep 2007
Posts: 166 |
Sit over it with a 12 ga and a half dozen gaddy dekes in January.
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Re: Duckweed
[Re: thrashfish]
#13647274
07/28/20 11:36 AM
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Joined: Apr 2005
Posts: 662
Dave Davidson
Pro Angler
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Pro Angler
Joined: Apr 2005
Posts: 662 |
It all depends on how much DW you have. If not much, you can spot treat it. If its an infestation, nuke about 1/4 of the pond at a time. If you do the whole thing at once, the rotting vegetation robs O2 for the water generally resulting in a fish kill. The fish need somewhere to go where there is still O2.
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