Thank you Fire for your hint.
I'll surely follow your method if needed.
I need to understand first what are the Rudd needs for best reproduction. I know PS make nests on gravel beds, but I've read that Rudd lay the eggs making them adhere to acquatic vegetation. I'll try to understand if they are more "comfortable" with soft lilies stalks or with rigid branches' twigs.
About lilies I have a little 4000 gallons pond dug in 2015 for my daughters and their red fish and it led me to a passion for lilies. Now I have about 50 different varieties of waterlilies in it. At this latitude they go dormancy from november to april, but as you say they must be managed carefully or become quickly invasive. In my little pond every single rhizome is planted in a black bucket and every year it needs to be explanted, dissected and replanted (only the best one) because they grow and sprout alot and "escape" from the bucket.
I'm thinking of trying to put bare-root lilies in the forage pond, simply tied to a weight to prevent them from floating and going around, to maximize their phyto-purifying effect. My biggest fear is that the water, with so many fish, will become too rich in nutrients and therefore fill up with algae.
Done some math and the forage pond will be a 1/15 of acre and about 100k gallons. Probably it won't be aerated and fish will be pellet feeded so I'm worried about eutrophication.
