Gulf of Alaska Acoustic-Trawl Survey of Walleye Pollock (DY1103, 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 during the late spring/summer of 2011 in the Gulf of Alaska to estimate the distribution and abundance of walleye pollock (Theragra chalcogramma). The survey was conducted on the Gulf of Alaska shelf extending from the Islands of Four Mountains to the Chiniak Trough east of Kodiak Island, 14 June to 12 August 2011, in three legs (leg 1, 14-29 June; leg 2, 5-22 July; leg 3, 6-12 August) aboard NOAA Ship Oscar Dyson, a 64 meter stern trawler equipped with acoustic and oceanographic instrumentation. The vessel departed Kodiak, Alaska on 14 June with intermediate port calls in Kodiak, Alaska. An extended port call occurred between legs 2 and 3 (22 July to 6 August) due to vessel mechanical issues. Smaller surveys were also conducted in several bays and around islands including Morzhovoi Bay (22 June), Sanak Trough (23 June), Pavlof Bay (25 June), the Shumagin Islands area (7-8 July), Mitrofania Island (9-10 July), Nakchamik Island (11-12 July), Shelikof Strait (16-21 July), Chiniak Trough (7-8 August), Barnabas Trough (9-10 and 11-12 August), and Alitak Bay (10-11 August). The cruise ended when the vessel arrived in Kodiak, Alaska on 12 August 2011.
  • Cite as: Alaska Fisheries Science Center (2011): Water Column Sonar Data Collection (DY1103, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V5WH2N2V [access date]
gov.noaa.ngdc.mgg.wcd:DY1103_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 2011-06-14T01:38:45 to 2011-08-12T22:46:39
Spatial Bounding Box Coordinates
N: 59.24596
S: 52.03333
E: -151.05
W: -170.09375
Spatial Coverage Map
General Documentation
Associated Resources
    Publication Dates
    • creation: 2011-06-14
    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) on the Gulf of Alaska shelf from the Islands of Four Mountains to Chiniak Trough east of Kodiak Island including several smaller surveys in bays and around islands, 14 June to 12 August 2011
    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 (2011): Water Column Sonar Data Collection (DY1103, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V5WH2N2V [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 (2011): Water Column Sonar Data Collection (DY1103, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V5WH2N2V [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 instrument 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 in Three Saints Bay, Kodiak Island, Alaska on 14 June 2011 and a post-cruise calibration was conducted on 7 August 2011 in Kalsin 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
      • DY1103_EK60
      Last Modified: 2017-05-31
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