Thornback ray (Lat. Raja clavata). It lives at the base of the continental shelf and near the coastal seashore. It tends to prefer areas with mud, gravel, sand, and rocks. An adult R. clavata lives near the shore during summer and moves into deeper water for the onset of winter up to 400m depth. It grows up to 139cm (average 98-120cm) and 18 kilos (average 2-4kg). During the winter and spring time females deposit up to 150 eggs from which after five months arrive small ones. The thornback ray likes to bury itself in the sediment during the day and come out at dusk to hunt. It feeds on crabs, fish, cephalopods polychaetes. In can be found all over the Adriatic Sea and around 200 tons are caught per year. The thornback ray is generally harmless to humans.