Acoustic-Trawl Surveys of Walleye Pollock in the Gulf of Alaska (DY1701, EK60)

The Midwater Assessment and Conservation Engineering (MACE) program of NOAA Fisheries, Alaska Fisheries Science Center (AFSC) conducted acoustic-trawl (AT) stock assessment surveys in the Gulf of Alaska (GOA) during the winter and early spring of 2017 to estimate the distribution and abundance of walleye pollock (Gadus chalcogrammus). These surveys were conducted aboard NOAA Ship Oscar Dyson, a 64 meter stern trawler equipped with acoustic and oceanographic instrumentation. The primary instrument for the surveys was a Simrad EK60 split-beam echosounder system utilizing five frequencies (18, 38, 70, 120, and 200 kHz). The vessel departed Kodiak, Alaska on 7 February and conducted the Shumagin Islands survey (including Shumagin Trough from Renshaw Point to Simeonof Island, Stepovak Bay, Unga Strait, and West Nagai Strait) 8-11 February. The Sanak Trough survey was conducted on 11 February followed by the Morzhovoi Bay survey on 12 February. The vessel transited to Pavlov Bay and conducted the Pavlov survey 13-14 February. A calibration of the echosounder system was conducted on 14 February in Volcano Bay, Alaska. The vessel returned to its homeport of Kodiak, Alaska on 16 February, 2017.
  • Cite as: Alaska Fisheries Science Center (2017): Water Column Sonar Data Collection (DY1701, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V5RJ4GRM [access date]
gov.noaa.ngdc.mgg.wcd:DY1701_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 Chuck Anderson
Water Column Sonar Data Manager
DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
(303) 497-4742
wcd.info@noaa.gov
Dataset Principal Investigator Chris Wilson
Supervisory Research Fish Biologist
DOC/NOAA/NMFS/AFSC > Alaska Fisheries Science Center
(206) 526-6435
chris.wilson@noaa.gov
Time Period 2017-02-06T20:53:52 to 2017-02-16T15:42:43
Spatial Reference System urn:ogc:def:crs:EPSG:4326
Spatial Bounding Box Coordinates
N: 58.02224
S: 54.41625
E: -151.99901
W: -163.22527
Spatial Coverage Map
General Documentation
Associated Resources
    Publication Dates
    • creation: 2017-02-06
    Dataset Progress Status Complete - production of the data has been completed
    Data Update Frequency Not planned
    Purpose Acoustic-trawl (AT) surveys of walleye pollock (Gadus chalcogrammus) in the Shumagin Islands, Sanak Trough, Morzhovoi Bay, and Pavlov Bay areas of the Gulf of Alaska, 7-16 February, 2017.
    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 (2017): Water Column Sonar Data Collection (DY1701, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V5RJ4GRM [access date]
    Resource Providers
    • DOC/NOAA/NMFS/AFSC > Alaska Fisheries Science Center
    Points of Contact
    • DOC/NOAA/NMFS/AFSC > Alaska Fisheries Science Center
    Publishers
      Publisher information not available.
    Theme keywords Global Change Master Directory (GCMD) Science Keywords
    • EARTH SCIENCE > Oceans > Ocean Acoustics > Acoustic Scattering
    • EARTH SCIENCE > Oceans > Aquatic Sciences > Fisheries
    • EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Bathymetry
    • EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > AQUATIC ECOSYSTEMS
    • EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > MARINE ECOSYSTEMS
    • Earth Science > Biosphere > Ecosystems > Marine Ecosystems > Benthic
    • Earth Science > Biosphere > Ecosystems > Marine Ecosystems > Pelagic
    • 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
    • GEOGRAPHIC REGION > GLOBAL
    • VERTICAL LOCATION > SEA FLOOR
    Keywords
      Use Constraints
      • Cite as: Alaska Fisheries Science Center (2017): Water Column Sonar Data Collection (DY1701, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V5RJ4GRM [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
      Processor
      • DOC/NOAA/NMFS/AFSC > Alaska Fisheries Science Center
      Lineage information for: series
      Lineage Statement The EK60 echosounder system transducers installed on NOAA Ship 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.
      Acquisition Information (collection)
      Instrument
      • Simrad EK60
      • Simrad ME70
      • Simrad EK60
      • Simrad ES60
      • Knudsen CHIRP 3260
      • Sippican XBT/XSV
      • SBE 49 FastCAT
      • SBE 911plus CTD
      • SBE 32
      • POS/MV 320
      Platform
      • Oscar Dyson (DY)
      Operation
      • DY1701_EK60
      Last Modified: 2018-01-23
      For questions about the information on this page, please email: wcd.info@noaa.gov