Acoustic-Trawl Survey of Walleye Pollock in the Southeastern Aleutian Basin near Bogoslof Island (DY0903, EK60)

The Midwater Assessment and Conservation Engineering (MACE) program of NOAA National Marine Fisheries Service (NMFS), Alaska Fisheries Science Center (AFSC) conducted an acoustic-trawl (AT) stock assessment survey in the Bogoslof Island area of the southeastern Aleutian Basin during late winter of 2009 to estimate the distribution and abundance of walleye pollock (Theragra chalcogramma). The survey was conducted 7-13 March, departing from Dutch Harbor, Alaska on 7 March and arriving in Kodiak, Alaska 15 March. A calibration of the Simrad EK60 echosounder system (the primary survey instrument) was conducted on 7 March. 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 (DY0903, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V5XG9P74 [access date]
gov.noaa.ngdc.mgg.wcd:DY0903_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 No POCs available for this dataset
Time Period 2009-03-07T20:52:34 to 2009-03-15T16:19:46
Spatial Reference System urn:ogc:def:crs:EPSG:4326
Spatial Bounding Box Coordinates
N: 57.72959
S: 52.81726
E: -152.08508
W: -169.87547
Spatial Coverage Map
General Documentation
Associated Resources
    Publication Dates
    • creation: 2009-03-07
    Dataset Progress Status Complete - production of the data has been completed
    Data Update Frequency Not planned
    Purpose Acoustic-trawl (AT) survey of walleye pollock (Theragra chalcogramma) in the Bogoslof Island area of the southeastern Aleutian Basin, 7-13 March 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 (DY0903, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V5XG9P74 [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
    • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    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 > 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
    Data Center keywords Global Change Master Directory (GCMD) Data Center Keywords
    • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
    • DOC/NOAA/NMFS > National Marine Fisheries Service, NOAA, U.S. Department of Commerce
    Instrument keywords Global Change Master Directory (GCMD) 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)
    • Bering Sea
    Global Change Master Directory (GCMD) Location Keywords
    • Global
    • Vertical Location > Sea Floor
    Use Constraints
    • Cite as: Alaska Fisheries Science Center (2009): Water Column Sonar Data Collection (DY0903, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V5XG9P74 [access date]
    Access Constraints
    • Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.
    • 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 prior to the start of the cruise in Broad Bay, Unalaska Island, Alaska.
    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
    • DY0903_EK60
    Last Modified: 2017-05-31
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