yah,im possative that you need to obtain a permit from the dnr to stock fish anywhere here.so maybe the dnr should think about doing it where ever they encounter problems with these fish in various states.i remember watching videos on youtube about how some one put yellow perch in a lake they had stocked with trout.the yellow perch took over and were hogging the food sources from the trout.they(dnr or whatever wildlife authorities) put some big net in the water and took a lot of yellow perch out and brought them somewhere in some truck