Dig through the archives here. Grass carp can be an effective, biological control for certain types of aquatic growth when used accordingly. I have absolutely noticed they slow down on control when they get older, which is why most recommend removing those fish and replacing with smaller, younger individuals.
As a fellow Hoosier, I too have had many a discussion with the officials in our IDNR. I would only say to be sure and seek out other, professional opinions. I wouldn't place all of my eggs into the IDNR's basket....my experience has been they seem a few years removed from modern practice.
I understand that you are angry, and upset. But you portray your opinion as fact, rather than opinion. I would suggest reading through the archives, and making an educated decision. Are grass carp for every BOW and every situation? Of course not, no more than a root canal fits the bill for every patient. But it remains an option in some cases, no?
