This photo was taken on the same day as the alewives. I went back to the river in the early evening when the sun had gone behind the trees edging the river. This shot was about 30 feet upstream from where the fish were navigating the waterfall. To decrease the shutter speed, so I could get the silky water effect, I put a polarizing filter on the front of the lens which also helped to reduce the reflections. When I first set up, the rock on the left of the frame was bone dry and extremely bright. Luckily the water was shallow so I waded over and splashed water on it which darkened it up and reduced the contrast.