We found that (i) Ttot concentrations of all tissues are heavily affected by the reproductive state (Figures 2, 3, 4); (ii) particularly liver Ttot concentrations and transketolase activity decreased with size/age (Figures 2D and 5B); (iii) the investigated cod stocks showed overall comparable Ttot concentrations (Figure 2) and no transketolase latency (Figure 5D), indicating that none of the stocks were suffering from thiamine deficiency. Here, TKT is linked to Thiamine deficiency.