Report of the Study Group on Multispecies Assessment in the Baltic (SGMAB)

In the case of Baltic herring in the Baltic Main Basin, the assessment unit is directly comparable to the units used by the Baltic Fisheries Assessment Working Group; although at their 2001 meeting WGBFAS (2001) used new stock assessment units for Baltic herring in the Main Basin. As the sprat population in Sub-division 30 is rather low and in Sub-division 31 almost non- existing, the Baltic Main Basin stock estimates are basically also referring to Sub-divisions 25–32. Consequently the effect of ignoring the two Sub-divisions should not hamper a direct comparison between single species and multispecies assessment output in the case of cod and sprat.