We have indeed, but the fish ladders here dont seem to work.
The salmon stock in that river actually died out all together, what is there now are a mix of various Atlantic salmon, and even those are needed to constantly be caught and stripped off eggs ASO so they can grow up artificial.
Even if it have been many decades the stock are not self reproducing in useful numbers.
In the #2 largest river here, the salmon as also thought to have died out, but a handful managed to survive in a 1/8 milt stretch of some little side canal, to the Skjern river salmon are still the original stock.