I knew this assignment would be a good candidate for my fish tank rig. The setup is simple: I place my camera in the bottom of a $10 aquarium tank, putting the lens against the glass on one side, then I run a remote trigger cord up to the rim of the tank. I then push down on the tank, trying to keep the waterline in the middle of the lens so that it shows the scene both above and below. What I didn’t anticipate was the sheer number of alewives that would be coming up through the fishway.