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    • Manual for the International Bottom Trawl Surveys. Revision IX. 

      International Council for the Exploration of the Sea; International Bottom Trawl Survey Working Group (International Council for the Exploration of the Sea, Copenhagen, Denmark, 2015)
      The International Bottom Trawl Survey (IBTS) in the North Sea has been conducted in the 1st quarter of the year since the beginning of the 1960s. The survey was first aimed at juvenile herring in the central and southern ...