They are in the tribs to the ohio. I am not sure if netting is even feasible in the rivers but from my limited convo with the bios they are not doing anything in the rivers to reduce the numbers or limit travel and have concluded that they are not reproducing either from their sampling over the years. (I am not sure I buy that last part though.) The rivers have a lower commercial fishing presence and frankly as you move away from the lakes and the ohio I have never seen a fish market to sell your catch. They can jump the low head dams or go over them in high water. They are in Barren up to bowling green and Green at least up to #5. I haven't run into them above #5 but it wouldn't surprise me if they are. It is a long way from #5 to GRL. Not as far from BG to BRL, plus there are numerous tribs to Barren river as well.