The National Institute of Aquatic Resources (DTU Aqua), Denmark, has been conducting drone surveys to evaluate the effects of barrier removal on habitat changes, fish diversity and density. Lowland barriers, such as those present in Denmark, are often associated with fish farms, which use them to take water in (as depicted in 1 of the pictures). In the event of weir removal, the fish farms will shut down (also depicted), giving wild fish – and especially salmonids – ease of passage. DTU Aqua’s work in the AMBER project is to evaluate the effects of barrier removal, and its efficiency in reinstating river connectivity and restoring natural habitats for fish populations. For more info, please contact Kim Birnie-Gauvin