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Keine überdurchschnittlichen Nachwuchsjahrgänge bei den Nutzfischen der Nordsee = No outstanding youngest year-classes of commercially important fish species in the North Sea
Dornheim, H.; Stein, M.; Wegner, G. (2001). Keine überdurchschnittlichen Nachwuchsjahrgänge bei den Nutzfischen der Nordsee = No outstanding youngest year-classes of commercially important fish species in the North Sea. Inf. Fischwirtsch. Fischereiforsch. 48(1): 12-18
In: Informationen für die Fischwirtschaft. Bundesforschungsanstalt für Fischerei: Hamburg. ISSN 0020-0344, more
Peer reviewed article  

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Keyword
    Marine

Authors  Top 
  • Dornheim, H.
  • Stein, M.
  • Wegner, G.

Abstract
    In January/February 2001, Germany participated with Walther Herwig III in the International Bottom Trawl Survey (IBTS) of ICES by contributing 70 half hour tows with the Grande Ouverture Verticale Bottom Trawl (GOV), 78 hydrographic stations, and 88 catches with the Method Isaac-Kidd net (MIK), mostly in the central and northern North Sea. In total, 368 fishing stations by means of the GOV were covered by the international fleet. Preliminary results indicate that only indices for herring, whiting, and - to some degree - haddock are in the long-term mean. In contrast, the index for cod gives reason to serious concern. In addition, indices for both mackerel and Norway pout do not show any signs for an increasing strength of these stocks. Oceanographic data show that in comparison with the data from 1995 onwards actual temperatures and salinities are in the normal range. However, mean water temperatures of this short period are about more than a half degree above the long-term means of the period 1961 to 1990.

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