Wegner, Gerd

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Fiskeridirektoratets digitalarkiv

 Bundesforschungsanstalt für Fischerei  Institut für Seefischerei   Palmaille 9, 22767 Hamburg, Tel. 38905 177  Fax 38905 263  02.03.2005  Az.: Wg./IBTS            WH271rep.doc   FRV WALTHER HERWIG III  Cruise 271: IBTS 2005 (I)  REPORT  19.01. – 14.02.2005   Participants  Gerd Wegner   BFA für Fischerei, Hamburg (in charge) Wolfgang Ahlers  BFA für Fischerei, Ast. Cuxhaven Annika Elsheimer  BFA für Fischerei, Hamburg Frank Fuhr   BFA für Fischerei, Hamburg (student helper) Gitta Hemken   BFA für Fischerei, Hamburg Dr. Matthias Kloppmann BFA für Fischerei, Hamburg Melanie Kruppe  BFA für Fischerei, Hamburg (student helper) Tobias Pfingstl   University of Graz (voluntary helper) Karin Schiefenhövel  University of Bremen (voluntary helper) Ingo Wilhelms   BFA für Fischerei, Hamburg   Objectives  1. Participation in the ICES co-ordinated 'International Bottom Trawl Survey' 2004 (I) in the North Sea 2. Distribution of herring larvae, temperature, salinity, and nutrients in the area of investigation   Narrative  Time schedule 19.01.2005, 18:30 Departure Bremerhaven 21.01., 08:00  Start of fishing in the northern German Bight 22.01.-04.02.  Sampling in the central area 04./05.02.  Break in Aberdeen, Scottland 06.02.-13.02.  Sampling in the western, norther, and eastern areas 14.02.2004, 18:00 End of survey in Bremerhaven  According to the international ICES program coordinated by the Netherlands (RIVO-DLO) the rectangles assigned to Germany in the northern and central North Sea were to be fished by means of the ICES standard bottom trawl GOV during daytime and by the pelagic herring larvae net MIK during night. Additionally, temperature and salinity measurements and nutrient samples were to be taken in each rectangle. Due to persistent gale and storm periods, WALTHER HERWIG was able to work only in 60 of the 77 rectangles assigned (comp.: cruise track). Another six GOV hauls were overtaken from the Norwegian vessel. In total, WALTHER HERWIG did 98 MIK and 66 GOV hauls as well as 64 CTD profiles.   Results  Except three larger hauls (herring, mackerel, young mackerel), the total catches of the 66 GOV hauls were in the lower part of the variations of the preceding years. Although giving a totally incomplete view on the basis of an incomplete survey, a comparison of the German 1-group fish numbers from the period 2001 to 2005 in the ICES roundfish areas (see table) demonstrates the further on disappointing recruitment situations.  Numbers of 1-group (ICES def.; 60 min trawling time)            year area herring cod haddock whiting mackerel sprat Norw. pout   <20cm <25cm <20cm <20cm <25cm <10cm <15cm          2001 1 4942 99 35166 2090 12402 150 1535052002 1 166 8 6706 290 11744 2 1351522003 1 452 1897 239 2231 1569412004 1 10 2 638 187 2744 347342005 1  1382 381 324696 50416         2001 2 18388 40 2190 1361 131 6 277792002 2 49752 35 227 3890 98 51302003 2 19921 2 48 455 207 2 29132004 2 700 99 28 959 4 8772005 2 1242 16 2 112 2 263 36         2001 3 7618 6 12364 7321 6 2288 170082002 3 1427 74 970 3675 10 10758 167532003 3 1533 2 242 6100 4 254 94702004 3 830 64 7698 17915 7543 558572005 3 24668 10 414 1498 23275         2001 6 30567 6 12 143964 4 34835 2002 6 28266 8 236 8105 2003 6 44815 2 466 13205 2004 6 6287 12 80 6712005 6 992 12 6 14791 The distribution of the herring larvae caught by the MIK was similar compared with the previous two years. Larger concentrations were spread over a larger offshore area in the north-western North Sea. The quantities were partly beneath the numbers of those years.  The hydrographic situation was characterized by temperatures of 0.4 –1.3 K and salinities of 0.1 ppt above the long term mean values in the whole area.     Gerd Wegner  gerd.wegner@ish.bfa-fisch.de  

FRV WALTHER HERWIG III Cruise 271: IBTS 2005 (I) Report

NORA - Norwegian Open Research Archives

https://fdir.brage.unit.no/fdir-xmlui/bitstream/11250/2358051/1/040812.pdf

FRV WALTHER HERWIG III Cruise 271: IBTS 2005 (I) Report

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