Looking at the deeds for my house today, I found that the Land Commission took the fishing rights for the land whereon the house is built.
At the moment, these rights are of little value as the house is near the top of a hill and surrounded by other houses and a graveyard. However, what with global warming and all that, it may be that there will be a rise in water levels and that the fishing rights will then be valuable.
Accordingly, I have written to the Department of Agriculture, which may be the successor to the Land Commission, to ask it to give me the fishing rights.
Irish waterways history 