Gov. Pat Quinn of Illinois, a Democrat, will be joined by Republicans Gov. Rick Snyder of Michigan and Gov. Scott Walker of Wisconsin on Saturday.
The governors met in Chicago with the Council of Great Lakes Governors, an organization representing the eight states and two Canadian provinces in the Great Lakes region.
Saturday's final round of meetings resulted in a mutual aid agreement under which the states and provinces will share staff and expertise in the event of a serious regional threat from invasive species.
The two-day gathering of the Council of Great Lakes Governors and the provinces of Ontario and Quebec also addressed strategies for improving maritime transport and attracting Chinese and other foreign investment in manufacturing.
Michigan Gov. Rick Snyder says, "The threat of aquatic invasive species transcends borders" and Saturday's agreement will empower the region to work together in solving the problem.