Then, they have dropped food to the dock and they move to the fish. Fishing a dock or a pier can be tricky if you don't know what you are doing. I've tried near the river with no luck. Docks and piers are both forms of structure in the water. Perfect for all types of fishing. Rather than drop a bait directly on this location, the better approach is to cast well beyond this area. My current challenge is to build a fishing dock but I can't seem to find a "green" spot to build? I like to think of them as an underwater. Dock Fishing Tiny Canals for What ever Bites. The most desirable fish are likely to be located along the outer edge of the dock, near the supports.