After the U.S. Supreme Court twice rejected requests from Michigan to close off Chicago area waterways to the invasive Asian carp species, the state is hoping there’s greater influence in numbers.

Now, five Great Lakes states – Michigan, Minnesota, Ohio, Pennsylvania and Wisconsin – are asking the U.S. Supreme Court to require nets in the waters and also to speed up a study of the problem, reports the Chicago Tribune. The U.S. Army Corps of Engineers is set to release a study in 2015, but “we can't afford to wait years before the federal government takes meaningful action,” said Michigan Attorney General Bill Schuette.

In August, a federal appeals panel rejected the states’ same request, but the Great Lakes states are hoping the high court will overturn that decision.

In the meantime, some states are taking their own action to curb the spread of the species. Read more about Illinois’ attempt to add Asian carp to the menu in food shelters here.