Police have appealed to the public for information amid signs of suspected illegal fishing on Loch Ochiltree, west of Bargrennan.
Oars and boats have been moved around in the shed at the remote loch, which is managed by Newton Stewart Angling Association and requires permission to be fished.
Over the past few weeks, it is believed access has been gained and someone has been using the boats. No damage has been caused.
Contact police by calling 101 with any information.