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What can be used to kill algae in a 14 acre pond?

Posted on 6/19/22 at 1:11 pm
Posted by shoelessjoe
Member since Jul 2006
10832 posts
Posted on 6/19/22 at 1:11 pm
Have a pond behind our house that we own but has a lot of algae. What to use to get rid of but not hurt fish, turtles and alligators.
Posted by GREENHEAD22
Member since Nov 2009
20034 posts
Posted on 6/19/22 at 1:17 pm to
How deep is it? 14 acres is a good size to have algae issues.
Posted by LSUEnvy
Hou via Lake Chas
Member since May 2011
12385 posts
Posted on 6/19/22 at 1:42 pm to
I’ve used copper sulfate but read instructions carefully.
Posted by keakar
Member since Jan 2017
30152 posts
Posted on 6/19/22 at 1:52 pm to
quote:

Have a pond behind our house that we own but has a lot of algae. What to use to get rid of but not hurt fish, turtles and alligators.


have you tried natural remedies like carp that eat grass and algae?

im not sure if it would be a bad idea, but some aquarium fish like algae eaters dont eat grass, if thats a concern, so that could be an option
Posted by shoelessjoe
Member since Jul 2006
10832 posts
Posted on 6/19/22 at 2:06 pm to
Was hoping there was a chemical that would be safe to use. I say it’s 14 acres but it’s in the shape of a horse shoe. The whole area is 14 acres but the pond may be 7 to 10 acres total. It’s surrounded by trees is about 15 feet deep in its deepest part.
Posted by Classy Doge
Member since Nov 2021
4031 posts
Posted on 6/19/22 at 2:16 pm to
quote:

Have a pond behind our house that we own but has a lot of algae


Pics?

As suggested previously, copper sulfate can be effective but is toxic to crawfish and invertebrates in high ppm's (not sure about fish)

Paging CrawDude!
This post was edited on 6/19/22 at 2:19 pm
Posted by keakar
Member since Jan 2017
30152 posts
Posted on 6/19/22 at 2:28 pm to
quote:

Was hoping there was a chemical that would be safe to use. I say it’s 14 acres but it’s in the shape of a horse shoe. The whole area is 14 acres but the pond may be 7 to 10 acres total. It’s surrounded by trees is about 15 feet deep in its deepest part.


well 15 ft is shallow so light still reaches all depths and that is a big part of the problem for you.

i think some sort of algae eating fish is your only permanent and safest solution not to harm the fish in it.

constant chemical treatments is expensive and you are just asking for mistakes to happen and kill off all or most of your fish.

a pond needs to be self regulating and self sustaining as far as its health so look into natural control rather then chemical control of it.

you may also want to look into some form of aeration system to help maintain good healthy oxygen levels so the algae doesnt cause a die off from lack of oxygen
This post was edited on 6/19/22 at 2:30 pm
Posted by wryder1
Birmingham
Member since Feb 2008
4590 posts
Posted on 6/19/22 at 2:31 pm to
Copper Sulfate and a boat motor prop. Make damn sure to read the instruction on how to dose because if you overdose, bye bye fish. I currently feed it at the majority of my water plants this time of year to kill the algae coming in. We are feeding around 8-10pm and it’s doing it’s job but I’m not trying to keep any fish alive either.
One thing to keep in mind is that when you kill all that algae, it will go to the bottom, rot and produce food for the next bloom. Once you kill it, keep an eye on things and do a maintenance dose until water temps start dropping.
Posted by deltaland
Member since Mar 2011
96465 posts
Posted on 6/19/22 at 2:37 pm to
Diuron or copper sulfate crystals. 2-3 50 lb bags of copper sulfate should do it

Dissolve it in a container of water then pour it in the pond. Don’t dump the crystals into the pond they don’t dissolve easily you need to mix it first.
Posted by deltaland
Member since Mar 2011
96465 posts
Posted on 6/19/22 at 2:49 pm to
quote:

As suggested previously, copper sulfate can be effective but is toxic to crawfish and invertebrates in high ppm's (not sure about fish)



In a 10 acre catfish pond at 5 feet deep it doesn’t get toxic to fish until about 3-400 lbs. I use it to kill trematodes. to knock back the algae 150lbs should do it.

5-7.5 gallons of diuron sprayed around the edge will also do it but you may need an applicators license to buy it or get someone who has one to buy it for you
Posted by LSU fan 246
Member since Oct 2005
90567 posts
Posted on 6/19/22 at 2:58 pm to
quote:

im not sure if it would be a bad idea, but some aquarium fish like algae eaters dont eat grass, if thats a concern, so that could be an option


That would be a bad idea. Do not put aquarium 'algae eating' fish in your pond. Dunno what fish you are even referring to but I am assuming plecos. Theyre sold as algae eaters but they dont do that at all.

They also get massive.
Posted by Classy Doge
Member since Nov 2021
4031 posts
Posted on 6/19/22 at 3:01 pm to
Great info. Does Diuron have similar toxic properties in high concentrations? I've spot sprayed sparingly with dissolved copper sulfate diluted, but very cautiously since my ponds only average 18"-21" deep
Posted by keakar
Member since Jan 2017
30152 posts
Posted on 6/19/22 at 3:01 pm to
quote:

That would be a bad idea. Do not put aquarium 'algae eating' fish in your pond. Dunno what fish you are even referring to but I am assuming plecos. Theyre sold as algae eaters but they dont do that at all.

They also get massive.


thats why i said i wasnt sure, i know they do good keeping aquariums clean from algae.

but my main point is he needs a natural fish that eats algae to maintain the pond without harsh chemicals
Posted by LSU fan 246
Member since Oct 2005
90567 posts
Posted on 6/19/22 at 3:05 pm to
quote:

i know they do good keeping aquariums clean from algae.


they dont. theyre sold as algae eaters to people that dont know any better then the fish gets huge and they dump it in a public waterway or kill it
Posted by armsdealer
Member since Feb 2016
11932 posts
Posted on 6/19/22 at 3:26 pm to
1a. Aeration
1b. Clean the muck out of the pond
2. Add desirable vegetation
3. block the sun. A shade is probably cost prohibitive and unfortunately most shade blockers you add to the water are bright blue. I have seen green, but green might filter too much light.

I wouldn't use copper sulphate or copper anything. It is toxic to fish even if it doesn't kill them, it will wipe out your crustaceans. It is very effective in killing plants though.

I'd personally "Farm" part of the pond with lots of aquatic plants to act as a breeding ground and nursery for fish and crawfish and only focus on keeping part of the pond clear. Then I would add aeration via windmill pond pumps.
Posted by deltaland
Member since Mar 2011
96465 posts
Posted on 6/19/22 at 3:35 pm to
Diuron won’t hurt the fish. If you use too much you can kill the oxygen levels and that can cause a problem. I’d suggest applying it in increments, not at once. Do half a gallon every other day for algae management. It also kills the shite out of moss
Posted by shoelessjoe
Member since Jul 2006
10832 posts
Posted on 6/19/22 at 5:26 pm to
I found a video that shows duck seed carp contain it. 10 per acre they use. They are sterile so don’t reproduce.
Posted by Trytoon
Member since Jan 2019
28 posts
Posted on 6/19/22 at 6:23 pm to
Don’t put carp in your pond. I did this in my pond 12 years ago, they cleaned the pond of all grass and I haven’t caught a bass over 2lbs since. I’ve removed all carp and some grass is coming back and fishing is better. Also the carp wouldn’t eat the algae in my pond
Posted by lsufan1971
Zachary
Member since Nov 2003
21300 posts
Posted on 6/19/22 at 6:39 pm to
I have a 14 acre and use pond dye with algaecide. Get 10-12 bottles.


Airmax Nature's Blue Pond Dye Plus with PondClear Beneficial Bacteria, Cleans & Clears Water, Safe for The Environment - 1 Gallon LINK
Posted by TutHillTiger
Mississippi Alabama
Member since Sep 2010
45878 posts
Posted on 6/19/22 at 8:08 pm to
Goldfish?
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