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Report of the Workshop to Draft Recommendations for the Assessment of Descriptor D3 (WKD3R), 13-17 January 2014, Copenhagen, Denmark

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Report of the Workshop to Draft Recommendations for the Assessment of Descriptor D3 (WKD3R), 13-17 January 2014, Copenhagen, Denmark ICES WKD3R REPORT 2014 ICES ADVISORY COMMITTEE ICES CM 2014/ACOM:50 REF. ACOM, SCICOM Report of the Workshop to draft recommen- dations for the assessment of Descriptor D3 (WKD3R) 13-17 January 2014 Copenhagen, Denmark International Council for the Exploration of the Sea Conseil International pour l’Exploration de la Mer H. C. Andersens Boulevard 44–46 DK-1553 Copenhagen V Denmark Telephone (+45) 33 38 67 00 Telefax (+45) 33 93 42 15 www.ices.dk [email protected] Recommended format for purposes of citation: ICES. 2014. Report of the Workshop to draft recommendations for the assessment of Descriptor D3 (WKD3R), 13-17 January 2014, Copenhagen, Denmark. ICES CM 2014/ACOM:50. 153 pp. For permission to reproduce material from this publication, please apply to the Gen- eral Secretary. The document is a report of an Expert Group under the auspices of the International Council for the Exploration of the Sea and does not necessarily represent the views of the Council. © 2014 International Council for the Exploration of the Sea ICES WKD3R REPORT 2014 | i Contents Executive summary ................................................................................................................ 1 1 Introduction .................................................................................................................... 4 1.1 Terms of reference ................................................................................................ 4 1.2 Background............................................................................................................ 4 1.3 Conduct of the meeting ........................................................................................ 4 1.4 Structure of the report .......................................................................................... 5 1.5 Follow-up process within ICES .......................................................................... 6 2 Setting the scene ............................................................................................................ 8 2.1 Introduction ........................................................................................................... 8 2.2 Presentations ......................................................................................................... 8 2.3 Steps identified ...................................................................................................... 9 2.4 Generic report structure for each of the four marine regions of MSFD ...................................................................................................................... 9 2.5 Indicators and reference levels – follow-up to presentation by Rainer Froese ....................................................................................................... 10 2.6 Population age and size distribution indicator .............................................. 11 2.7 References cited in Sections 2 ............................................................................ 11 3 Baltic Sea Region ......................................................................................................... 12 3.1 Introduction ......................................................................................................... 12 3.1.1 Identification of commercially exploited fish- and shellfish populations for the Baltic Sea ............................................................... 12 3.1.2 Compilation of stock information relating to D3 criteria ................. 14 3.2 Overall summary ................................................................................................ 25 3.3 Problems and gaps identified ........................................................................... 25 3.3.1 Data gaps in the context of single and multispecies ......................... 25 3.3.2 Indicators in a multispecies environment – some considerations for the central Baltic Sea stocks ................................. 26 Single species and multispecies MSY reference points ................................ 28 3.4 Recommendations for further development ................................................... 29 3.5 References cited in Sections 3 ............................................................................ 30 3.6 Overall status of the Baltic Sea in relation to Criteria 3.1 and 3.2 ................ 31 3.7 References cited in Sections 3 ............................................................................ 32 4 North-east Atlantic Region ........................................................................................ 33 4.1 Introduction ......................................................................................................... 33 4.1.1 Regional scope ........................................................................................ 33 ii | ICES WKD3R REPORT 2014 4.1.2 Selection of commercial fish and shellfish stocks .............................. 33 4.1.3 Compilation of stock information relating to D3 criteria ................. 33 4.1.4 Stocks assessed by ICCAT .................................................................... 34 Category 3 stocks were reviewed in terms of the survey(s), used as a basis of advice, their data availability and overall suitability to apply approximation methods of reference points, fishing mortality and biomass as described below in Section 4.1.5............................................................................................. 34 4.1.5 Secondary indicators for Criteria 3.1 and 3.2 ..................................... 34 4.2 North Sea ............................................................................................................. 43 4.3 Celtic Sea .............................................................................................................. 51 4.4 Bay of Biscay and Iberian Coast ........................................................................ 61 4.5 Macronesia ........................................................................................................... 68 4.6 Overall status of the North-east Atlantic in relation to Criteria 3.1 and 3.2 .................................................................................................................. 70 4.7 References cited in Sections 4 ............................................................................ 73 5 Mediterranean Sea Region ......................................................................................... 75 5.1 Introduction: overview on the knowledge on the status of commercial stocks in the Mediterranean ......................................................... 75 5.1.1 Current data collection under CFP/DCF ............................................ 83 5.2 Comparison of approaches for MSFD implementation - Descriptor 3 ............................................................................................................................. 83 5.2.1 Selection of commercially exploited populations .............................. 84 5.2.2 Assessment of current status in relation to GES ................................ 88 5.2.3 Approaches and methods applied for indicators .............................. 89 Primary Indicator 3.2.1 - Spawning Stock Biomass ............................................ 91 Primary indicator 3.3.1 - Proportion of fish larger than the mean size of first sexual maturation ............................................................................. 92 Primary indicator 3.3.2 - Mean maximum length across all species found in research vessel surveys ............................................................... 92 Primary indicator 3.3.3 - 95% percentile of the fish length distribution observed in research vessel surveys .......................................................... 92 5.2.4 Evaluation of the performance of trend-based indicators to detect stock status .................................................................................. 93 5.2.5 Status by region/sub-region ................................................................. 95 5.2.6 Classification of Mediterranean stocks ............................................... 98 5.3 Problems and gaps identified ......................................................................... 101 5.4 Recommendations ............................................................................................ 103 5.4.1 Enhance standardized approaches for GES assessment ................. 103 5.4.2 Develop methods for the assessment of data-limited stocks ......... 105 5.4.3 Evaluation of the GES ......................................................................... 105 5.5 References cited in Sections 5 .......................................................................... 106 5.6 List of species to be monitored in the Mediterranean Sea under the DCF (Annex 1) ................................................................................................... 107 ICES WKD3R REPORT 2014 | iii 5.7 Case studies in the Mediterranean Sea using the Catch-MSY method for estimating MSY (Annex 2) .......................................................... 111 6 Black Sea Region ....................................................................................................... 124 6.1 Introduction ....................................................................................................... 124 6.2 Selection of commercially exploited fin- and shellfish populations relevant for Descriptor 3 in the Black Sea .....................................................
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