The new pond is only big enough for about 3 ducks to fit on, and I think that the local fox would make short work of them.
How can I reduce nutrient content without adding filtration (running electricity to the ponds is not viable)? Are there any aquatic or marginal plants suitable for the small pond that will mop up nutrients?
Introducing fast growing plants may pose a competition for Lemna and reduce it´s growth.
However i don´t really undertsnad why Lemna seems to be so annoying for you.
Elodea, Eichornia crassipes, Azolla....are some fast growing plants you could use. However, i don´t think they will erradicate Lemna, they´ll just compete with it, and if they are removed duckweed will probably strike back.
I think your best bet is to net it off, and "clean" the plants with stuck duckweed with a hose, and then net it of again.
I agree that adding plants to compete with the duckweed would help. But I'd prefer native species. Azolla is defitely not suitable as this fixes nitrogen and makes the problem worse.
Myrrhiophyllum or Potamogeton species should be OK. Just shop around in ponds and lakes in the neighbourhood.
It is also likely to become less of a problem when the pond ages.
The older pond probably has a nutrient problem because of fallen leaves in the autumn; trees that are not our property have grown up to overhang the pond. We recently revamped the pond and restocked it with plants after a a major dredging, so hopefully things will balance out in time. The new pond is just a normal hole dug in the garden with a butyl liner. We don't use fertilisers in our garden. The duckweed hasn't got a hold yet, so hopefully all the other plants (Elodea, Nymphaea, Potomogeton, water forget-me-not) will outcompete it. I am also removing the little bits that I see.
The duckweed is a problem because it smothers the submerged plants byt blocking out almost all the light. The submerged plants then die, rot and cause the pond ecosystem to collapse, whilst providing more nutrients for the duckweed to grow. I don't mind having a little bit, as it provides cover for amphibians and invertebrates, but I don't want it to smother the pond by becoming too prevalent.
A further recommendation as a native boggy semi floating marginal - watercress. It mops up nitrogen very well in my small tanks and grows well in shallow ponds. If there are not sheep to carry liver fluke you can also eat it.
Avoid azolla like the plague. It's like duckweed on steroids.
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Hi all I'm new here I'm just looking some advise on cycle witch is currently driving me insane . So we are week 8 I'm dosing daily with 4pp of amonia and for the last week has been dropping to zero witch I no is good. But my question is my nitrites are sitting at between 0.50 and 1.0 PM and nitrates are between 10 and 20 and neither of these seem to be dropping. I have done 2 40% water changes a few days ago and no change the only thing I can think of is I didnt use the seachem stability stuff which I have now ordered but surely that shouldn't have much difference this far into cycling