The U.S. Supreme Court again has refused to hear a case about Asian Carp.
Five Great Lake states, including Michigan, asked the high court to order temporary closure of locks and canals around Chicago that connect to Lake Michigan. The states say the U.S. Army Corps of Engineers and the agency that regulates the locks are ineffective in their efforts to stop the carp.
Today's decision marks the fourth time in the last two years the Supreme Court has declined to get involved in the controversy, according to the Chicago Tribune.
The five states argue that if it gets into the lakes, the giant invasive carp may disrupt the food web by outcompeting commercial and sports fish.
The federal government says there already are effective measures in place to stop it, including electric barriers designed to block passage of fish into Lake Michigan.
The states of Illinois and Indiana say closing the locks would disrupt commerce that depends on the shipping canals.
The case is expected to continue, even without a court order for temporary closure.