Acoustic-Trawl Survey of Walleye Pollock in the Gulf of Alaska (MF0309, EK500)

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 Gulf of Alaska during late spring/early summer of 2003 to estimate the distribution and abundance of walleye pollock (Theragra chalcogramma). The survey was conducted along the Gulf of Alaska (GOA) shelf and shelfbreak from the Shumagin Islands to Prince William Sound, 4 June to 16 July 2003, aboard NOAA Ship Miller Freeman, a 66 meter stern trawler equipped with acoustic and oceanographic instrumentation. The vessel departed Kodiak, Alaska on 4 June and arrived in Kodiak on 16 July. The echosounder system was calibrated at the start of the cruise in Three Saints Bay, Kodiak Island, Alaska on 5 June, and at the end of the cruise in Ugak Bay, Kodiak Island, Alaska, 16 July 2003.
  • Cite as: Alaska Fisheries Science Center (2003): Water Column Sonar Data Collection (MF0309, EK500). National Centers for Environmental Information, NOAA. doi:10.7289/V51834KK [access date]
gov.noaa.ngdc.mgg.wcd:MF0309_EK500
Search Data
Distribution Formats
  • Simrad EK500 data logged in .ek5 format (Version: 1)
    • File Specification: Simrad EK500 data logged with Echolog 500. These files contain EK500 data telegrams output by an Ex500 on its Ethernet port. The .ek5 file contains binary Ethernet packets as output by the Simrad echosounder. The EK500 manual contains full details of the EK500 Ethernet telegram formats and should be consulted for interpreting the Ethernet packets recorded within an .ek5 file.
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 2003-06-04T00:00:00 to 2003-07-15T23:59:59
Spatial Reference System urn:ogc:def:crs:EPSG:4326
Spatial Bounding Box Coordinates
N: 60.83285
S: 54.47687
E: -15.39866
W: -160.58005
Spatial Coverage Map
General Documentation
Associated Resources
    Publication Dates
    • creation: 2003-06-04
    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 Gulf of Alaska, 4 June to 16 July 2003
    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.
    Dataset Citation
    • Cite as: Alaska Fisheries Science Center (2003): Water Column Sonar Data Collection (MF0309, EK500). National Centers for Environmental Information, NOAA. doi:10.7289/V51834KK [access date]
    Custodians
    • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    Resource Providers
    • DOC/NOAA/NMFS/AFSC > Alaska Fisheries Science Center
    Points of Contact
    • DOC/NOAA/NMFS/AFSC > Alaska Fisheries Science Center
    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)
    • Gulf of Alaska
    Global Change Master Directory (GCMD) Location Keywords
    • Global
    • Vertical Location > Sea Floor
    Use Constraints
    • Cite as: Alaska Fisheries Science Center (2003): Water Column Sonar Data Collection (MF0309, EK500). National Centers for Environmental Information, NOAA. doi:10.7289/V51834KK [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 acoustic instruments for the survey were a Simrad EK500 split-beam echosounder system utilizing two frequencies (38 and 120 kHz), and a Simrad EK60 split-beam echosounder operating at 200 kHz. The transducers installed on the Miller Freeman were mounted on a deployable centerboard. The transducer draft settings 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 6.15 meters below the surface. The echosounder system was calibrated at the start of the cruise in Three Saints Bay, Kodiak Island, Alaska 6 June 2003, and at the end of the cruise, 16 July 2003 in Ugak Bay, Kodiak Island, Alaska.
    Acquisition Information (collection)
    Instrument
    • Simrad EK500
    Operation
    • MF0309_EK500
    Last Modified: 2017-05-31
    For questions about the information on this page, please email: wcd.info@noaa.gov