Results of the echo integration-trawl survey of walleye pollock (Theragra chalcogramma) conducted on the southeastern Bering Sea shelf and in the southeastern Aleutian Basin near Bogoslof Island in February and March 2002
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Results of the echo integration-trawl survey of walleye pollock (Theragra chalcogramma) conducted on the southeastern Bering Sea shelf and in the southeastern Aleutian Basin near Bogoslof Island in February and March 2002

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  • Description:
    "Scientists from the Midwater Assessment and Conservation Engineering (MACE) Program of the Alaska Fisheries Science Center (AFSC) conduct research surveys of Bering Sea walleye pollock (Theragra chalcogramma) to estimate pollock distribution and abundance. Results presented in this report are from the echo integration-trawl (EIT) survey carried out between 18 February and 11 March 2002 on the southeastern Bering Sea continental shelf and in the southeastern Aleutian Basin near Bogoslof Island (the Bogoslof Island area) aboard the NOAA ship Miller Freeman. The primary objective of the Bering Sea shelf portion of the survey was to assess the abundance and distribution of pollock inhabiting the Steller sea lion Conservation Area (SCA) east of 168OW. The primary objective of the Bogoslof portion was to assess the abundance and distribution of pre-spawning pollock in the southeastern Aleutian Basin. The biomass estimate for pollock inside the North Pacific Fishery Management Council's (NPFMC) Statistical Reporting Area 518 (Area 518; the same as the Central Bering Sea (CBS) Convention Specific Area ) obtained during this survey provides an index of abundance for Aleutian Basin pollock. The Japan Fisheries Agency also conducted an EIT survey of pollock in the southeastern Aleutian Basin between 9 February and 5 March 2002. This survey was conducted aboard the R/V Kaiyo Maru in cooperation with the United States in order to estimate distribution and abundance of pre-spawning pollock. In addition to surveying the Bogoslof Island area, they surveyed basin and slope waters north of the Aleutian Islands west of 170°W to about 176°W. Prior to the start of the U.S. survey in February, the two vessels conducted an intership calibration to compare acoustic systems. Intership calibration results will be presented in a different report. This report summarizes the U.S. EIT survey results on observed pollock distribution and biological composition, and provides abundance estimates. It also summarizes oceanographic observations and acoustic system calibration results"--Introduction.
  • Content Notes:
    by Taina Honkalehto, Neal Williamson, Dale Hanson, Denise McKelvey, and Steve de Blois

    "September 2002."

    Also available online in PDF format via AFSC and the NOAA Central Library.

    Includes bibliographical references (pages 15-16).

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