Thank you for the feedback.
I'm not sure what the vegetation is, it surronds the pond up to the banks and appears to disappear when the water gets deeper then several feet.
This is a photo of the pond just after it was redug in 2002. The shoreline is at the level of the brown dirt. Where the shoreline dips away is where this vegetation disappears. The pond is up to 35', maybe 40' deep.
My intention is to add some grass carp when I can. If it is muskgrass, will the grass carp help control it?
