Ehrich, S.

Kafemann, R.

English

Fiskeridirektoratets digitalarkiv

 Bundesforschungsanstalt für Fischerei  Institut für Seefischerei       Palmaille 9, 22767 Hamburg        Tel. 38905 179          Fax 38905 263        15.9.2005       Az.: Dr.Ehr./                   WH290bre.doc   „WALTHER HERWIG III"  Cruise 290  REPORT  17.07. – 15.08.2006  Personnel  Name    Institution  1. Dr. Siegfried Ehrich    ISH-BFA (1. leg)  2. Dr. Rudolf Kafemann    ISH-BFA   3. Dipl. Biol. Christoph Bucher  ISH-BFA  4. Herr Dirk Tinnemeyer    ISH-BFA   5. Herr Sascha Bednarz    ISH-BFA   6. Herr Hermann Neumann    ISH-BFA  7. Herr Piet Linde    ISH-BFA  8. Herr Claus Scholz    ISH-BFA  9. Dr. Ingrid Kröncke    Forsch. Senckenberg 10. Dipl. Biol. A. Markert    Forsch. Senckenberg  11. Herr Daniel Bode    FTZ Westküste 12. Herr Moritz Mercker    FTZ Westküste (1. leg) 13. Frau Henriette Dries    FTZ Westküste (2. leg)  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 epifauna in the boxes and in the German Bight 5. Monitoring of seabirds 6. Comparison fishing with FRV “Scotia”    Narrative (Fig. 1)  W. Herwig III left Bremerhaven the 17th of July 2006. The scientific programme started next morning at ICES-rectangle 38F7. During this day another 3 rectangles were monitored by taking samples of fish, water (nutrients, temperature, salinity) and benthic epi-fauna (Tab. 1). The vessel than worked in the boxes C, L and M (3 days each). The first 2 days of the 4 days in box D a comparison fishing experiment was carried out together with the Scottish FRV “Scotia”. After a two days break in Aberdeen (Scotland) the standard programme was continued at box B. After two days fishing in 8 ICES-rectangles in the German Bight, 3 days in Box A and another 11 rectangles the scientific program ended the 13th of August. The next day was used to check the fishery winches. The 'W. Herwig III' docked at Bremerhaven the 15th of August.   Tab. 1: Activities (stations) during the cruise  area GOV-hauls CTD nutrients 2m-beamtrawl v.Veen grab Box A 21 15 4 9 9 Box B 20 14 6 9 9 Box C 21 15 9 9 9 Box D 24 18 5 12 12 Box L 21 15 6 9 9 Box M 20 15 6 9 9 ICES-rectangles 23 23 23 23 23 total 150 115 59 80 80   Results (Tab. 1 and Figs. 2-7)  A total of 150 half an hour and valid hauls were made using the GOV trawl equipped with the standard ground gear, of which 127 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 115 stations salinity, temperature and at 59 stations nutrients were measured. Epibenthos was sampled by a 2m beam-trawl at 80 stations and 80 grab samples were taken to investigate the sediment.  The preliminary number at age data for the recruiting year-classes of the commercial important species and the catch data were submitted to the co-ordinator of the IBTS-Q3 survey and ICES resp. to make these data available to the ICES assessment working groups 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; Dr. R. Kafemann         ares:5 26 2 °E 5F 3E 9 F 7E 7 F 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 85 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. 290. Area of investigation and boxes   02004006008001000120014001600180020001987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006yearmean catch rate (kg/30min)othersspratscadmackerelherringwhitingcodplaicedabBox A      Fig. 2: Box A: German Bight: Main species composition (kg/30min)      from 1987 to 2006 (summer)   02004006008001000120014001600180020001987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006yearmean catch rate (kg/30min)othersspratmackerelherringwhitinghaddockcoddabBox B Fig. 3: Box B. English coast. Main species composition (kg/30min)           from 1987 to 2006 (summer)  0501001502002503003504004501987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006yearmean catch rate (kg/30min)othersherringwhitinghaddockcoddabBox C Fig. 4: Box C. Danish coast. Main species composition (kg/30min)           from 1986 to 2006 (summer)   050010001500200025003000350019861987198819891990199119921993199419951996199719981999200120022003200420052006Jahrmittlerer Fang (kg/30min)andereMakreleHeringStintdorschWittlingSchellfischKabeljauLimandeKliesche Box D Fig. 5: Box D. Scottish coast. Main species composition (kg/30min)           from 1986 to 2006 (summer)    02004006008001000120014001600180020001999 2001 2002 2003 2004 2005 2006Jahrmittlerer Fang (kg/30min)andereHeringMakreleSeelachsWittlingSchellfischBox L Fig. 6: Box L. Norwegian coast. Main species composition (kg/30min)         in 1999 and from 2001 to 2006 (summer)    02004006008001000120014001999 2001 2002 2003 2004 2005 2006Jahrmittlerer Fang (kg/30min)andereStintdorschHeringMakreleSeelachsWittlingSchellfischKabeljauBox M Fig. 7: Box M. Norwegian coast. Main species composition (kg/30min)         in 1999 and from 2001 to 2006 (summer) 

„WALTHER HERWIG III" Cruise 290 Report

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„WALTHER HERWIG III" Cruise 290 Report

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