Descriptor 3. Five main steps were identified to assess Good Environmental Status GES for D3: • Selection of commercially exploited (shell)fish populations relevant to the MSFD (sub)region, or MS-specific sub-division, being assessed with respect to D3;
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Five main steps were identified to assess Good Environmental Status GES for D3:
• Selection of commercially exploited (shell)fish populations relevant to the
MSFD (sub)region, or MS-specific sub-division, being assessed with respect
• Identification of stocks that can be assessed in relation to the primary assessment
criteria for D3.1 and D3.2;
• Determination of criteria to apply to stocks that can not be assessed in relation
to the primary assessment criteria, and identification of stocks that
can be assessed according to these secondary criteria;
• Interpretation of how to define GES for D3 with respect to combining individual
stock assessments at the criteria level, and how to combine criteria
level assessments at the descriptor level;
• Assessment of current status in relation to GES.
Fishery indicators V.Raykov,IO-BAS
For the overall assessmentof Descriptor 3, three approaches were considered in the case studies: (1) noaggregation across criteria; (2) application of the one-out-all-out aggregation rule or“assessment by worst case”; or (3) application of weights for the different criteria.
A higher proportion of assessed stocks increases the quality of the GES assessment;
species/taxa for which no information is available decreases the quality;
length of the time-series (with/without Reference levels);
stock assessments are conducted
for which only information from monitoring programs is available.
Proportion of fish larger than the mean size of first sexual maturation
Mean maximum length across all species found in research vessel surveys
95% percentile of the fish length distribution observed in research vessel surveys
Size at first sexual maturation, which
may reflect the extent of undesirable genetic effects of exploitation
Threshold for inclusion of species – 1% but in Baltic Sea 0.5% as a threshold for salmon – important but with low catches;
Daskalov et al., 2012
7.20 cm < Lmean < 8.80 cm.
Cumulative contribution of TL=7cm varied 3.2-24.5%(max 2008,min 2010)