Use of Radarsat F5 images for detection and positioning of fish cages

We have investigated whether synthetic aperture radar images can be used to observe and position the fish farms and polymer type fish cages along the Norwegian coast. In order to maximize sea-object backscatter difference, the images selected are Radarsat F5 with 10 m×10 m resolution, 45-48° incidence angle and HH-polarization. We found that it was possible to detect and position all fish cages within the study area, even single ones of polymer-type. It was also possible to determine the overall shape of larger collections of fish cages, and count the number of fish cages within the collections. The wind condition was favorable during the satellite pass (less then 5 m/s). It is concluded that Radarsat F5 images are well suited to detect and position fish farms.