2023-2024 Participants:
| Organisation | Fish - Reverse Ring Test | Fish - Ring Test | Country |
| Agri Food Biosciences Institute (AFBI) NI | 1 | 1 | UK |
| CIBM "G.Bacci" | 1 | 0 | Italy |
| Environment Agency | 10 | 8 | UK |
| Fugro GB Marine Ltd. | 0 | 1 | UK |
| Hull Marine Laboratory (University of Hull) | 0 | 1 | UK |
| Northern Ireland Environment Agency (NIEA) | 1 | 1 | UK |
| Ocean Ecology Ltd. | 0 | 1 | UK |
| The Marine Biological Association of the UK | 0 | 1 | UK |