In total, 95 individuals obtained from 3 sampling sites were
analysed: G1 (40 individuals) from the Bay of Gdańsk, International
Council for the Exploration of the Sea (ICES) subdivision 26; G2 (29 individuals),
ICES SD 25 and KIEL (26 individuals) fromKiel Bight, ICES SD
22 (Fig. 1) during March and June of 2012.