Greg Grimes - thankyou.
I have never seen Grass Carp offered for sale by registered fish breeders in California , however I will check further on legality. Any suggestions, generally speaking, how many carp would be needed to keep a 5 acre pond under control with the weeds described. The pond is not a huge problem with weed growth. It's in good shape except for the elodea, and lesser degree the chara.