Map showing the general location of the Outer Oslofjord with the study area (black star) and the details of the study area.
Black line delimits the Ytre Hvaler National Park; Stripped polygons delimit the areas with full protection (i.e. no fishing or other leisure or commercial activities); Brown areas indicate areas with kelp forest. The 300 m isobaths is shown. The figure was made using the software ArcMap 10.1 by ESRI (http://www.esri.com/).