Ok I didn't realize I needed the fish icon as well. Thanks for the picture, I'll fix it.
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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.