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REPORT OF THE STUDY GROUP ON MULTISPECIES ASSESSMENT IN THE BALTIC (SGMAB)

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Version 2 2023-05-25, 11:38
Version 1 2022-03-01, 07:59
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posted on 2005-01-01, 00:00 authored by ICESICES
The Study Group addressed the full range of Terms of References, although it should be recognized that the variety and complexity of the ToRs overstretched the capabilities of the group. Recognizing this, the technical effort concentrated on i) reviewing and updating the multispecies databases, ii) conducting a multispecies key run for the eastern Baltic to be used by WGBFAS, iii) performing spatially dis-aggregated MSVPA runs for the eastern Baltic and iv) testing fishing mortalities for cod suggested by AGLTA to result in low risk to reproduction and high long-term yields. For central Baltic herring, the multispecies assessment unit has not been directly comparable to the units used by WGBFAS, as the single species assessment excludes Gulf of Riga herring. Thus, the multispecies database was re-arranged by excluding the Gulf of Riga from Subdivision 28, making as well preliminary runs to test for the effect of the exclusion. An update of the Western Baltic MSVPA is still pending, as the revision of the western Baltic herring assessment by HAWG in 2002 is still not implemented in the multispecies database. Scientific oriented activities comprised i) a test for the impact of reduced oxygen concentration and consumption rates by cod on predation mortalities estimated by the MSVPA, ii) gathering of information on environmental processes affecting the temporal and spatial distribution and stock dynamics of herring and iii) explaining historical trends and changes in mean weight-at-age of herring. Strategic coordination and planning activities were conducted together with SGBFFI and addressed first specific actions like the organization of a common cod stomach sampling program, and data requirements from future ecosystem oriented surveys. Secondly structural requirements for conducting a regional integrated assessment of the Baltic Sea were discussed. This resulted in a suggestion to restructure the WG and SG group set-up underneath the Baltic and Advisory Committees. This suggestion should be seen as a starting point of a discussion in a broader forum rather than a well defined plan. Finally SGMAB outlined a work programme for the years to come.

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