Parrot's Feather Aquatic Weed {Myriophyllum aquaticum}

Parrot's feather weed is an invasive species of water plant that has somehow been introduced into our lakes within the last few years
(which is why it now appears as a problem, but as has been commented, has not been seen in previous years).
We do not know where this alien species originated from as far as our lakes are concerned, or how it managed to get into the lakes in the first place.
It is likely that it was initially introduced into lake 1, either intentionally, accidently or by natural causes, and has now spread to all of the lakes.

Since it only takes a tiny fragment of stem material to initially populate a lake, it it is likely that it has been moved around by landing/keepnets, or possibly even by local wildlife.
But now that it is established it is going to be very difficult to remove, and our only practical method is continual raking, which, as you can imagine, is going to be a slow and time-consuming activity.

so anyone who wishes to rake out their swim prior to/or after fishing is encouraged to do so - the management team can only do so much!

Some background

First found in the UK in the 1960’s Parrots feather is an alien invasive species. Parrots feather is native to central South America. It can now be found on up to 300 sites across the UK. While it has mostly been found in ponds, there have been instances of it living in gravel pits, reservoirs, canals, streams and ditches. Unlike other plants from the same genus, parrots feather has the ability to continue growing when ponds and waterways dry out. Its characteristic feathery appearance, producing both emergent shoots as well as submerged ones. The plant spreads by asexual means; this is because it is only the female plants that have established within the United Kingdom. The plants stems are quite brittle and the plant propagates itself through the growth of small fragments from the parent plants.

Unfortunately the species is sold by nurseries and aquatic garden centres and as a result is grown in ponds right across the UK. Garden centres also often sell M. propernaciodes, or M. brasiliense, or M. propium – these should be avoided as they are all also highly invasive species. Parrots feather has now become established in Austria and France, as well as the UK. It is not believed that the introduction of these plants has been deliberate, but that small fragments of the plant have been transferred via the soil of other purchased aquatic plants.

taken from https://www.heathlandaquaticengineering.co.uk/article/parrots-feather-aquatic-weed-/