2022-2023 Participants:
| Organisation | Fish - Reverse Ring Test | Fish - Ring Test | Country |
| Agri Food Biosciences Institute (AFBI) NI | 1 | 1 | UK |
| Cyfoeth Naturiol Cymru / Natural Resources Wales | 0 | 2 | UK |
| DAERA Environment, Fisheries and Marine Group Laboratory | 1 | 1 | UK |
| Environment Agency | 6 | 1 | UK |
| Fugro GB Marine Ltd. | 0 | 1 | UK |
| Hull Marine Laboratory (University of Hull) | 0 | 1 | UK |
| Ocean Ecology Ltd. | 0 | 1 | UK |