Six Great Lakes state attorneys general have filed an amicus brief defending the right of states to protect their natural resources from aquatic invasive species.

The brief specifically voices support of Michigan regulations for ocean-going ships. The rules, based on a 2005 law, are the focus of a federal lawsuit now being heard by the U.S. Court of Appeals for the Sixth Circuit. A U.S. district court judge ruled in favor of the Michigan law last year.

Legislation has been introduced in several Great Lakes states to follow Michigan's lead on ballast water regulations. In addition, state regulators in Minnesota and Wisconsin are considering the adoption of statewide ballast water rules.

Click here for more information on the amicus brief.