My very wise 92 year old mother who lives in Arizona tells me that carp are used to control millfoil in small lake/pond in her retirement community. I found the attached article through a google search, and although it dates back to 1990, much of it is relevant and informational (and to be sure, much has been further researched since that time). Allow me to share, at the following link:
http://turf.lib.msu.edu/1990s/1990/900901.pdf
In any case, the article contains some interesting "food for thought" and I rather imagine (or would certainly hope) the powers that be in the state of New Hampshire have consulted with their counterparts in other states who are facing similar challenges with their respective bodies of water.
