is widely spread across the Belgian part of the North Sea (BPNS) and reaches a high frequency of occurrence in all areas. A low distribution frequency was only observed in the eastern coastal zone in the 1994-2001 period. In addition to its wide distribution pattern S. bombyx
was mainly found in high densities (1976-1986 period: up to 1,500 ind./m2; 1994-2001 period: up to
12,000 ind./m2). In short, S. bombyx
is one of the most common species on the BPNS.