Ehrich, S.

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Bundesforschungsanstalt für Fischerei  Institut für Seefischerei       Palmaille 9, 22767 Hamburg        Tel. 38905 179          Fax 38905 263        12.11.2003       Az.: Dr.Ehr./1985                   WH254bre.doc    „WALTHER HERWIG III"  Cruise 254  REPORT  22.07. – 17.08.2003   Personnel  Name    Institution Part  1. Dr. Siegfried Ehrich    ISH-BFA  I  2. Dipl. Oz. Peter Cornus    ISH-BFA  II  3. Svenja Cummerow    ISH-BFA  I + II  4. Wiebke Mohr    ISH-BFA  I + II  5. Sascha Bednarz    ISH-BFA  I + II  6. Ingo Wilhelms    ISH-BFA  I   7. Sandra Löhndorf    EU-DG14  II  8. Dipl.-Biol. Sonja Terraschke   ISH-BFA  I + II  9. Dipl.-Biol. Jens Ulleweit    ISH-BFA  I + II 10. Dr. Ingrid Kröncke    Forsch. Senckenberg  I + II 11. Hermann Neumann    Forsch. Senckenberg  I + II 12. Dipl.-Biol. Henning Reiss    Forsch. Senckenberg  I + II 13. Erich Marschmann    ISH-BFA  II 14. Bastian Kulschewski    ISH-BFA  I+II 15. Dr. Gerhard Rech    BMVEL  I; until 24.7.03   Objectives  1. To participate in the ICES co-ordinated 'International Bottom Trawl Survey' in the North Sea, 3. quarter 2. Biological monitoring of the fish fauna in 6 small areas (boxes) 3. Distribution of temperature, salinity and nutrients in the area of investigation 4. Monitoring of the benthic epi- and infauna in the boxes and in the German Bight  (as part of the ICES-Project MAFCONS)  Narrative (Fig. 1)  With one day delay the scientific programme started in the morning of 22th of July at ICES-rectangle 36F6. During the next 5 days 19 rectangles were monitored by taking samples of fish, water (nutrients, temperature, salinity) and benthic epi- and infauna (Tab. 1). The vessel than worked for 2 days in box C and another 3 days in box L, before it sailed to Bergen/Norway to have a two days break.  In the evening of the 4th of August W. Herwig III left Bergen and stayed for 3 days each in the boxes M, D, B, and A, only interrupted by one day fishing in 4 ICES-rectangles in the German Bight. The scientific program ended on the 16th of August. The 'W. Herwig III' docked at Bremerhaven on Friday, the 17th of August 2003.  Tab. 1: Activities (stations) during the cruise  area GOV-trawl Hydro-Sonde nutrients 2m-beam-trawl v. Veen grab Box A 20 14 9 8 26 Box B 21 15 6 9 30 Box C 14 10 4 6 21 Box D 21 15 9 9 30 Box L 21 15 6 9 30 Box M 21 15 9 9 30 ICES-rectangles 23 23 23 23 115 total 141 107 66 73 282   Results (Tab. 1 and Figs. 2-7)  A total of 141 half an hour and valid hauls were made using the GOV trawl equipped with the standard ground gear, of which 118 hauls were carried out in the boxes to monitor changes in species compositions and 23 hauls in different ICES-rectangles as part of the IBTS Q3 survey, mainly within the German Bight. At 107 stations salinity, temperature and at 66 stations nutrients were measured. Epibenthos was sampled by a 2m beam-trawl at 73 stations and 282 grab samples were taken to sample the benthic infauna.  The preliminary number at age data for the recruiting year-classes of the commercial important species and the catch data were submitted to ICES to make these data available within due time.  Fig. 1 shows the area of investigation. The mean species compositions in the 6 boxes and the variability within the time periods are shown in Figs.2 to 7.         Dr. S. Ehrich          Dipl.-Oz. P. Cornus        ares:5 26 2 °E 5 F 3E 9 F 7E 7F 5F 1 F 9E 6 F 4F 0 F 8E 8 F 6F 2 G 04 45 93 64 84 03 25 04 2 5 73 4 5 34 63 8 5 53 02 95 15 0 °5 14 35 83 54 73 93 14 96 14 15 63 35 24 56 03 75 45 ° W4 3 2 1 0 1 3 4 5 6 87 9 1 02 1 1 ° EDLMBCA Fig. 1: „Walther Herwig III“. Cruise no. 254. Area of investigation and boxes   02004006008001000120014001600180020001987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003yearmean catch rate (kg/30min)othersspratscadmackerelherringwhitingcodplaicedabBox A       Fig. 2: Box A: German Bight: Main species composition (kg/30min)      from 1987 to 2003 (summer)   02004006008001000120014001600180020001987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003yearmean catch rate (kg/30min)othersspratmackerelherringwhitinghaddockcoddabBox B Fig. 3: Box B. English coast. Main species composition (kg/30min)           from 1987 to 2003 (summer)  0501001502002503003504004501987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003yearmean catch rate (kg/30min)othersherringwhitinghaddockcoddabBox C Fig. 4: Box C. Danish coast. Main species composition (kg/30min)           from 1986 to 2003 (summer)   05001000150020002500300035001986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2001 2002 2003yearmean catch rate (kg/30min)othersmackerelherringNorway poutwhitinghaddockcodlemon soledabBox D Fig. 5: Box D. Scottish coast. Main species composition (kg/30min)           from 1986 to 2003 (summer)    02004006008001000120014001600180020001999 2001 2002 2003yearmean catch rate (kg/30min)othersherringmackerelsaithewhitinghaddockBox L Fig. 6: Box L. Norwegian coast. Main species composition (kg/30min)         in 1999 and from 2001 to 2003 (summer)    02004006008001000120014001999 2001 2002 2003yearmean catch rate (kg/30min)othersNorway poutherringmackerelsaithewhitinghaddockcodBox M Fig. 7: Box M. Norwegian coast. Main species composition (kg/30min)         in 1999 and from 2001 to 2003 (summer) 

„WALTHER HERWIG III" Cruise 254 REPORT

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„WALTHER HERWIG III" Cruise 254 REPORT

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