Despite all the money and effort, what has gone wrong? Just check the habitat for salmon. The water is suffering from increasing eutrophication, causing algae to run riot. Water-born insects have departed, so there is no food left for the fish.
進一步檢視國寶魚棲息地，溪水逐日優養化，藻類滋生，水生昆蟲避之而去，少了食物與淨水，小魚一回到溪裡，幾乎百分百夭折。