Principal coordinates analysis (PCoA) enabled further investigation
of the genetic relationships amongst populations. The genetic distances
amongst individuals were determined by means of Genalex v.6.4. A
PCoA showed that analysed cod individuals formed two clusters: the
first encompassing the individuals from KIEL population which was
well separated from the other, second one where individuals from G1
and G1 populations were poorly separated from each other, with no
clear demarcation of populations (Fig. 5). Axes 1 and 2 explain 5.84%
and 2.73% of the total genetic variation, respectively.