Fig. 6

Biplots from the PCA of concentrations of fatty acids with principal components 1 and 2 and following paired SIMCA test results for a sprat and b herring caught from the Baltic Proper, Bothnian Sea and Gulf of Finland in autumn and spring. Each symbol refers to a pool (whole body homogenate), which for sprat consisted of 12–92 specimens and for herring 7–133 specimens