Further to the answer to question S7W-01986 by Jim Fairlie on 17 August 2026, which stated that the Marine Directorate Licensing Operations…

Marine Directorate recognises that this matter has attracted significant interest and that a number of people have been waiting for the outcome of the investigation. It is also acknowledged that the investigation has taken longer than originally anticipated. This was to ensure that all reasonable lines of enquiry were fully considered before a final decision was reached.Marine Directorate carried out local investigations, including interviewing witnesses and seizing evidence. Witnesses described dead and discoloured prawns and reduced creel catches. One witness reported seeing a large vessel in Loch Hourn, but could not identify it. Marine Directorate undertook aerial surveys, which found no signs of pollution, no visible marine mortality and no costal contamination. AIS, Themis and Telesto vessel tracking analysis was conducted and did not identify any vessels in the area of the suspected pollution incident. A number of vessels were identified operating further away in Loch Hourn and the operators of those vessels were identified. Vessel movement information was provided, operators confirmed that AIS had been active at all times and denied that that any cleaning, disinfection or discharge activity had been undertaken.In collaboration with SEPA, MRV Sir John Murray visited the location and undertook sampling and camera transect analysis of the seabed at the locations of the affected creel fleets and trawl grounds. The survey found isolated dead sea urchins, but could find no evidence of significant or widespread contamination. Further, there was no evidence of unusual odour, contamination or widespread mortality in the sediment samples.Having completed those enquiries, the Marine Directorate has concluded that there is insufficient evidence to establish either that an offence was committed under the Marine (Scotland) Act 2010, or to identify any person or organisation responsible. As a result, the investigation has been closed with no further enforcement action possible.We appreciate that this outcome may be disappointing for those who reported concerns or consider that they were affected by the events observed within Loch Hourn. However, decisions on enforcement action must be based on the available evidence, and the evidential threshold required was not met in this case.