Posted by James22 on April 01, 2011 at 22:50:16 from (207.179.239.175):
In Reply to: Weeds in pond!!! posted by SJ on April 01, 2011 at 01:23:53:
It takes a lot of chemical to clean up when you let it get that bad. I've used grass carp a little, but they initially eat the plants you would prefer keeping for the fish and they only digest approx 40% with the remainder passed as green "stuff" into the water, which doesn't make it look that attractive. To get them to eat the less desirable stuff you need to overstock the pond and they will eventually eat everything. Grass carp will even jump out of the pond and eat grass if they don't have alternative forage. I've successfully controlled cattails by cutting them off below the water line when they are just setting their head. Only about 20% recover which thins them pretty quick, and after a couple years they are gone. RU will also kill them but I've avoided using it. I have been using copper sulfate with good success in controlling the other green stuff. But you must hit it early before the pond gets covered or risk killing too much green stuff and it will suffocate the fish when it sinks to the bottom. I try and treat it when there is only a couple of feet around the edge and although you might not kill the fish it takes alot more chemical when you get behind. I have treated a 50% covered pond, but it is over 20 ft deep and treated only 1/2 each time. Copper sulfate will corrode metal and can be hard on overflow pipes and boats.
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