I have a page about the Fergus estuary here with links from that page to others about places on the estuary (including Paradise).
Mediaeval fishweir at the Boarland Rock in the Fergus Estuary © Dr Aidan O’Sullivan, UCD 2008
The UCD School of Archaeology has, for many years, been investigating the Fergus estuary and has found remarkable evidence of settlement and activities on the estuary stretching back to the Iron Age (about 100 BCE) and the Bronze Age (almost 800 BCE). Read about the project here and see more photos of mediaeval fishweirs and earlier artefacts here.
The photo above is used in accordance with the terms set out here.
Irish waterways history 