Cobble Reef Restoration in Sønderborg

Jon C. Svendsen (Author), Lotte Kindt-Larsen (Author), Karsten Dahl (Author), Bo Mammen Kruse (Author), Gesine Ramm (Author), Nicole Rhodes (Author), Jeannet Bertelsen (Author)

Research output: Non-textual formSound/Visual production (digital)Communication


Here, DTU Aqua presents a short film revealing recent progress on a project investigating the effects of cobble reefs on fish abundance and diversity in southern Denmark..
The project uses baited and unbaited underwater cameras to monitor fish at six different locations in Sønderborg Bay. The locations are: two natural cobble reefs, two sandy seabeds (control sites) and two project sites (sandy seabeds where cobble reefs will be restored). Footage was collected from each of the sites, and again will be collected after the cobble reef restoration
Analyses examine if fish abundance and diversity change with cobble reef restoration. Data from the restored cobble reefs will be compared against the control sites and natural reefs. Data will be used to establish whether changes can be attributed directly to the reef restoration. Analyses will also reveal differences between fish species and fish body sizes recorded using baited and unbaited cameras.
Results from this study will be used to determine whether cobble reefs should be restored further to support fish diversity and abundance in coastal areas but also be applied to estimate the impacts of ongoing cobble excavation.
For more information regarding this project, please contact researcher Jon C. Svendsen at:
Original languageEnglish
Publication date2017
Media of outputYouTube video
Publication statusPublished - 2017


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