Gulf of Alaska Acoustic-Trawl Surveys of Walleye Pollock (DY0901, EK60)

The Midwater Assessment and Conservation Engineering (MACE) program of NOAA National Marine Fisheries Service (NMFS), Alaska Fisheries Science Center (AFSC) conducted acoustic-trawl (AT) stock assessment surveys in the western Gulf of Alaska (GOA) during the winter of 2009 to estimate the distribution and abundance of walleye pollock (Theragra chalcogramma). The vessel departed Kodiak, Alaska on 12 February and conducted acoustic echosounder system calibrations in Three Saints Bay, Kodiak Island, Alaska on 12-13 February. The vessel conducted the Shumagin Islands survey (including Shumagin Trough, Stepovak Bay, Renshaw Point, Unga Strait, and West Nagai Strait) 15-18 February. The vessel then surveyed Sanak Trough on 18-19 February, followed by a survey of the continental shelf break from Sanak Island to Unalaska Island 19-20 February. The vessel conducted equipment research operations utilizing a lowered target strength transducer system 21-22 February and arrived in Dutch Harbor, Alaska on 22 February. The primary acoustic echosounder system for this survey was a Simrad EK60; a Simrad ME70 multibeam echosounder system was also operated for the duration of the cruise. The survey was conducted aboard NOAA Ship Oscar Dyson, a 64 meter fisheries research stern trawler equipped with acoustic and oceanographic instrumentation.
  • Cite as: Alaska Fisheries Science Center (2009): Water Column Sonar Data Collection (DY0901, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V59S1P3T [access date]
gov.noaa.ngdc.mgg.wcd:DY0901_EK60
Search Data
Distribution Formats
  • Simrad EK60 raw (.raw) format (Version: 1)
    • File Specification: Simrad EK60 raw files. See the Simrad EK60 interface specification manual for additional information.
Ordering Instructions Contact the NCEI Water Column Sonar Data Manager to order data
Distributor Distributor information not available
Dataset No POCs available for this dataset
Time Period 2009-02-12T03:14:11 to 2009-02-22T15:32:13
Spatial Bounding Box Coordinates
N: 57.78369
S: 53.01667
E: -152.0455
W: -168.09573
Spatial Coverage Map
General Documentation
Associated Resources
    Publication Dates
    • creation: 2009-02-12
    Dataset Progress Status Complete - production of the data has been completed
    Data Update Frequency Not planned
    Purpose Acoustic-trawl (AT) surveys of walleye pollock (Theragra chalcogramma) in the Shumagin Islands and Sanak Trough areas of the Gulf of Alaska, 13-22 February 2009
    Use Limitations
    • These data are considered raw and have not been subjected to the NOAA's quality control or quality assurance procedures. They are released for limited public use as preliminary data to be used only with appropriate caution. NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.
    • Not subject to copyright protection within the United States.
    Dataset Citation
    • Cite as: Alaska Fisheries Science Center (2009): Water Column Sonar Data Collection (DY0901, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V59S1P3T [access date]
    Custodians
    • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    Resource Providers
    • Dataset contact information not available
    Publishers
      Publisher information not available.
    Theme keywords
    • Earth Science > Oceans > Ocean Acoustics > Acoustic Scattering
    • Earth Science > Oceans > Aquatic Sciences > Fisheries
    • Earth Science > Oceans > Ocean Acoustics
    • Earth Science > Biosphere > Ecosystems > Marine Ecosystems > Pelagic
    • Earth Science > Biosphere > Ecosystems > Marine Ecosystems
    • Earth Science > Biosphere > Ecosystems > Marine Ecosystems > Benthic
    • Earth Science > Biosphere > Ecosystems > Aquatic Ecosystems
    • Earth Science > Oceans > Bathymetry/Seafloor Topography > Bathymetry
    • Earth Science > Oceans > Bathymetry/Seafloor Topography > Seafloor Topography
    Instrument keywords
    • In Situ/Laboratory Instruments > Profilers/Sounders > Acoustic Sounders > WCMS > Water Column Mapping System
    Place keywords International Hydrographic Organization (IHO) Sea Area ("Limits of Oceans and Seas" publication S-23)
    • Gulf of Alaska
    • Global
    • Vertical Location > Sea Floor
    Keywords
      Keywords
        Use Constraints
        • Cite as: Alaska Fisheries Science Center (2009): Water Column Sonar Data Collection (DY0901, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V59S1P3T [access date]
        Access Constraints
        • Resource may not be available for up to one year after initial collection.
        Fees
        • Free
        Lineage information for: collectionHardware
        Lineage Statement Calibrated w/o calibration data
        Lineage information for: series
        Lineage information for: series
        Lineage Statement The primary instrumentation for the survey was a Simrad EK60 split-beam echosounder system utilizing five frequencies (18, 38, 70, 120, and 200 kHz). The EK60 transducers installed on the Oscar Dyson are mounted on a deployable centerboard. The transducer draft settings in the EK60 software are nominally correct when the centerboard is fully extended (draft correction setting is 9.15 meters below the surface). When the centerboard is in the retracted position (transducers approximately flush with the vessel's keel), the transducers are nominally 6.1 meters below the surface. The vessel is also equipped with a Simrad ME70 multibeam echosounder system with a hull mounted transducer. The EK60 and ME70 systems were calibrated at the start of the cruise on 12-13 February 2009 in Three Saints Bay, Kodiak Island, Alaska.
        Acquisition Information (collection)
        Instrument
        • Simrad ME70
        • Simrad EK60
        • Simrad ES60
        • Knudsen CHIRP 3260
        • SBE 49 FastCAT
        • SBE 911plus CTD
        • SBE 32
        • POS/MV 320
        Platform
        • Oscar Dyson (DY)
        Operation
        • DY0901_EK60
        Last Modified: 2017-05-31
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