Frank,
If it is legal to stock grass carp either diploid or tripolid (white amur)I suggest about 25-50 in your 5 acre pond. If you are willing to wait and see 25 may work. My expereince is they do a great job on elodea but do not like chara as well. If you want to rid of both weeds next year stock 50. If at some point you fell you have too many have a blast catching these hard fighting fast growing fish. Believe it or not they are good table fare as well. Two concerns when stocking...if the water overflows the pond construct a fish barrier, they love flowing water. Also if you have large bass greater than 18 inches stock a minimum size of 10 and better 12 inch fish. Otherwise they will be expensive bass food.


Greg Grimes
www.lakework.com