Is pondweed good or bad?
Last year first time Algae, this year floating pondweed. We built our pond in 91.
In 93 due to our stupidity of putting the level control pipe horizontally through the dam near the middle of the dam length the winter ice pushed the pipe up and during the spring thaw water leaking under the pipe from the ice swell began eroding the dam at the pipe. In a couple weeks the pipe wash out had lowered the
water level to about 25% of normal and made a need to haul in a lot of dirt to repair the dam. We put the overflow pipe at the far end during the repair and had it come up vertically through the water to the water height we wanted. That has worked fine and we have never had an overflow of the dam to date with the 18 pipe. As the pond refilled from rain and field runoff we stocked it with fish including a couple special carp to help keep the bottom clean. Haven稚 seen them for a couple years so they are probably dead. Last year, 2010 we began getting Algae around the edge of the pond for the first time during our August drought. We treated it with copper sulfate doing 3 doses over 3 weeks, each being 1/3 the amount needed for our size pond. It worked great and no more was required for the year.
This year some Algae is just starting again but a floating pondweed started growing in the shallow area a few weeks ago where the fish make their nests.
You can see it in the picture from the previous post. In the meantime it has doubled in area to date. Looking for a control on the net I find there are many
rather expensive treatments as well as less expensive but all are chemicals. While researching today I find that our use of a little bit of Copper Sulfate last year
has probably contributed to the growth of the pondweed this year. The article at
Using Natural Ingredients for Algae Control and Pond Weed Control looks like using most of the chemicals for pondweed just makes conditions worse for the fish and will make the Algae worse, a vicious circle. The bacteria this site recommends sounds good but I have no experience with this problem or the solutions and am asking for other pond owner input who have had these problems as well as what to do to fix it. Or, is the pondweed a good thing if I rake some of it out to keep the spread under control?
Ron