Report of the Study Group on Multispecies Assessment in the

2,69

MB

Baltic

82

stron

3605

ID

Helsinki Commission

2003

rok

TABLE OF CONTENTS

Section Page

1 INTRODUCTION

1.1 Participation.

1.2 Terms of Reference..

1.3 Background..

1.4 Supporting projects and background information..

1.5 Overview of Baltic Sea multispecies modelling.

2 STATUS OF THE MULTISPECIES DATABASE.

2.1 Stocks in the Central Baltic (Subdivisions 25–32).

2.2 Stocks in the Western Baltic (Subdivisions 22–24 and Division IIIa).

2.3 Database update (catch at age and weight at age in the Central Baltic)..

2.4 Database update (catch at age and weight at age in the Western Baltic)

2.5 Stomach content information..

2.6 Possible data improvements.

3 MSVPA KEY RUN FOR 1974–2001 IN THE BALTIC MAIN BASIN.

3.1 MSVPA set-up

3.2 Results of the key run for 1974–2001..

4 PRELIMINARY MSVPA KEY RUN FOR 1974–2002 IN THE BALTIC MAIN BASIN.

4.1 MSVPA-run for 1974–2002

4.2 MSVPA set-up for 1974–2002..

4.3 Results of the preliminary MSVPA-run for 1974–2002..

5 STOCK-RECRUITMENT RELATIONSHIP OF COD.

5.1 Modified conventional stock-recruitment relationship exercise..

6 LONG-TERM FORECASTS FOR COD, HERRING AND SPRAT..

7 LONG-TERM SIMULATIONS AND ENVIRONMENT.

7.1 Long-term simulations with environmentally driven cod recruitment..

7.2 Stock recruitment relationships

7.3 Growth.

7.4 Maturity ogives

7.5 Other input data

7.6 Identification of future environmental conditions from historic time series..

7.7 Fisheries management scenarios..

7.8 Long-term projection results.

8 MULTISPECIES STOCK PRODUCTION MODEL..

9 GROWTH CHANGES IN BALTIC SEA CLUPEOIDS

9.1 Growth changes in the Central Baltic

9.2 Growth changes in the Gulf of Finland.

9.3 Possible incorporation of clupeid-zooplankton interactions in Multispecies Models

10 COOPERATION AND COORDINATION OF FUTURE WORK BETWEEN SGMAB AND BSRP.

11 RECOMMENDATIONS..

12 REFERENCES

ANNEX 1: LIST OF PARTICIPANTS AND THEIR CONTACT ADDRESSES..