Minnesota's battle to stop the spread of invasive species such as zebra mussels and Asian carp will be ramped up in 2013 -- and that fight will affect the state's estimated 2.3 million boaters. For the first time, the DNR launched random roadside checks of boaters in 2012. But just nine check stations were conducted involving 140 boaters. (The violation rate: 31 percent.) This year, DNR officials plan to boost the number of roadside checks, and will try some in busier areas they avoided last year. Meanwhile, the new Aquatic Invasive Species Research Center at the University of Minnesota will be up and running in 2013 -- but don't expect any silver bullets soon.