There's a town. To the left of the town I put a water siphon. To the left of that I put a fishery. I tried to put the fishery harvesters in the water in front of the fishery. The game just kept saying the harvesters needed to be in the water even though I was putting them in the water.
Were they completely in the water AND next to fish? http://prntscr.com/gha0vg