| Results of the March 2009 echo integration-trawl survey of walleye pollock (Theragra chalcogramma) conducted in the southeastern Aleutian Basin near Bogoslof Island, cruise DY2009-03 - :11980 | National Marine Fisheries Service (NMFS)
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Results of the March 2009 echo integration-trawl survey of walleye pollock (Theragra chalcogramma) conducted in the southeastern Aleutian Basin near Bogoslof Island, cruise DY2009-03
  • Published Date:
    2009
Filetype[PDF-1.07 MB]


Details:
  • Personal Authors:
  • Corporate Authors:
    Alaska Fisheries Science Center (U.S.)
  • Description:
    Scientists from the Midwater Assessment and Conservation Engineering (MACE) Program of the Alaska Fisheries Science Center (AFSC) regularly conduct echo integration-trawl (EIT) surveys in late February and early March to estimate pre-spawning walleye pollock (Theragra chalcogramma) abundance in the southeastern Aleutian Basin (Honkalehto et al. 2008). These surveys were conducted annually between 1988 and 2007 (with the exception of 1990 and 2004), and biennially starting in 2009. The biomass estimate for walleye pollock within the Central Bering Sea (CBS) Convention Specific Area obtained during these surveys provides an index of abundance for the Aleutian Basin walleye pollock stock. This report summarizes observed walleye pollock distribution and biological information from the winter 2009 EIT survey, and provides an abundance estimate. It also summarizes physical oceanographic observations and acoustic system calibration results.

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