To show shadows, I took a picture of these fish where the light was placed above them, so you could see their shadow below them. The fish are all toward the top of the photo in a different color blue then the background, and the shadow are a dark grey color below the fish. What I find very interesting about this photo is that the shadows of the fish tells a different story than the swimming fish. For this image, my aperture was f4.5, shutter speed was 1/32, and ISO1600.