There was an issue similar to this one several years ago, I believe on the Dundee in Maryland. If I remember correctly, property owners did own land under the water surrounding their docks. They filed a claim, I guess the right term, to prevent fisherman in boats from fishing around their docks.

The judge ruled that while the owners owned land, they did not own the water and fisherman in boats had every right to the water, not get out on docks or set foot on private land.

All people had a right to the water.

Hope I remembered this right.