Why can't anglers use two lines in Minnesota?
At Stevens, program consultant for the MN DNR section of fisheries, working primarily with lake surveys, regulations and fishing tournaments, said:
Minnesota’s bag limits, size restrictions, and seasons are based on that requirement. We manage our fish populations, and all states do this, with a suite of three tools: We regulate seasons, possession limits (bag limits) and the methods, like number of lines and number of hooks.
When one of the main three regulatory tools is liberalized, the others must compensate or we risk over-harvest and decline in quality. If you don't do that, too much angling pressure can lead to declines in fish quality. For example, we allow one line and Wisconsin allows two, three in the winter. But, they have some other compensating regulations: They don't allow motor trolling in many areas and they don't allow winter pike spearing, like we do. So, all states have some way of managing their harvest.