These days, you can see mud pouring continuously from the cultivated land into both sides of the Chichiawan Stream. The water is filled with silt, greatly reducing the oxygen permeability. In addition, chemical fertilizers from the farm have caused an overgrowth in the algae on the rocks. As a consequence, both the rate at which eggs are produced and the rate at which the eggs hatch have been in decline.
如今七家灣溪兩岸農田整地，只見泥沙不斷沖入溪流，河流充滿細砂，河床透氧率降低，加上來自農場的化肥滲入溪水，造成營養過度，鵝卵石上孳生綠藻，鮭魚產卵率與孵化率也越來越低。