Acoustic-Trawl Surveys of Walleye Pollock in the Central Gulf of Alaska (DY0904, ME70)

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 central Gulf of Alaska (GOA) during the late winter/early spring of 2009 to estimate the distribution and abundance of walleye pollock (Theragra chalcogramma). The vessel departed Kodiak, Alaska on 19 March and conducted a survey along the central Gulf of Alaska shelf east of Chirikof Island 20-22 March. The vessel then surveyed Shelikof Strait 23-28 March and performed an acoustic equipment calibration on 29 March. The Marmot Bay survey was conducted 29-30 March followed by fisheries research equipment testing on 31 March. The vessel ended the cruise in Kodiak, Alaska on 1 April. The survey was conducted aboard NOAA Ship Oscar Dyson, a 64 meter stern trawler equipped with acoustic and oceanographic instrumentation.
  • Cite as: Alaska Fisheries Science Center (2009): Water Column Sonar Data Collection (DY0904, ME70). National Centers for Environmental Information, NOAA. doi:10.7289/V5NZ85Q5 [access date]
gov.noaa.ngdc.mgg.wcd:DY0904_ME70
Search Data
Distribution Formats
  • Simrad ME70 raw (.raw) format (Version: 1)
    • File Specification: Simrad ME70 raw files. See the Simrad ME70 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 2009-03-19T20:54:52 to 2009-03-28T16:35:54
Spatial Bounding Box Coordinates
N: 58.39255
S: 55.1
E: -152.368
W: -156.83156
Spatial Coverage Map
General Documentation
Associated Resources
    Publication Dates
    • creation: 2009-03-19
    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 Chirikof shelf break, Shelikof Strait, and Marmot Bay areas of the central Gulf of Alaska, 19 March to 1 April 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 (DY0904, ME70). National Centers for Environmental Information, NOAA. doi:10.7289/V5NZ85Q5 [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
      Use Constraints
      • Cite as: Alaska Fisheries Science Center (2009): Water Column Sonar Data Collection (DY0904, ME70). National Centers for Environmental Information, NOAA. doi:10.7289/V5NZ85Q5 [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 EK60 system was calibrated prior to the start of the cruise on 12 February 2009 in Three Saints Bay, Kodiak Island, Alaska and at the end of the cruise also in Kizhuyak Bay, Kodiak Island, Alaska. A Simrad ME70 multibeam echosounder system is installed on the vessel; the transducer is mounted on the ship's hull 10 meters forward of the centerboard trunk and about 1.5 meters to the port side of the ship's centerline.
      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
      • DY0904_ME70
      Last Modified: 2017-05-31
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