Average (±SE) differences between measured and predicted extreme δ¹⁸O values (in ‰) obtained for the 3 sub-stocks when using either the fractionation equation for inorganic aragonite [2] or that for juvenile plaice reared under controlled conditions [43].

Significant differences, based on unilateral Wilcoxon tests for paired samples, are shown at P<0.05 (*), P<0.01 (**) or P<0.001 (***). Average (±SE) differences between measured and predicted extreme δ18O values (in ‰) obtained for the 3 sub-stocks when using either the fractionation equation for inorganic aragonite [2] or that for juvenile plaice reared under controlled conditions [43].