GRAFTON, Ill. (AP) — When they arrive at the processing plant, the fish that have been cursed as a menace to American lakes and rivers are raked onto a conveyer belt, some of them still flopping.

Brought by the boatload to this facility north of St. Louis, the Asian carp quickly meet a gruesome fate: They are ground to a bloody pulp in a maze of machines that churn their bony bodies into dehydrated meal and fish oil.