Acoustic-Trawl Survey of Walleye Pollock in the Gulf of Alaska (DY1604, 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 in the Shelikof Strait and Marmot Bay areas of the Gulf of Alaska (GOA) during late winter/early spring of 2016 to estimate the distribution and abundance of walleye pollock (Gadus chalcogrammus). The Shelikof Strait survey was conducted 14-21 March, and the Marmot Bay survey was conducted 22-24 March, 2016. 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 (2016): Water Column Sonar Data Collection (DY1604, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V5F769JQ [access date]
gov.noaa.ngdc.mgg.wcd:DY1604_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 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 2016-03-09T21:29:56 to 2016-03-24T12:45:18
Spatial Bounding Box Coordinates
N: 58.51543
S: 54.11874
E: -151.64086
W: -165.17622
Spatial Coverage Map
Documentation links not available.
Publication Dates
  • creation: 2016-03-09
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 Shelikof Strait and Marmot Bay areas of the Gulf of Alaska
Dataset Citation
  • Cite as: Alaska Fisheries Science Center (2016): Water Column Sonar Data Collection (DY1604, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V5F769JQ [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 > 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
  • 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
  • GEOGRAPHIC REGION > GLOBAL
  • Vertical Location > VERTICAL LOCATION > SEA FLOOR
Use Constraints
  • Cite as: Alaska Fisheries Science Center (2016): Water Column Sonar Data Collection (DY1604, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V5F769JQ [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
Processor
  • DOC/NOAA/NMFS/AFSC > Alaska Fisheries Science Center
Lineage information for: series
Lineage Statement 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 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 system was calibrated on 11 February, 2016 in Kalsin Bay, Kodiak Island, Alaska, and again on 18 March, 2016 in Alitak Bay (near Cape Hepburn), Kodiak Island, Alaska.
Acquisition Information (collection)
Instrument
  • Simrad ME70
  • Simrad EK60
  • Knudsen CHIRP 3260
  • SBE 49 FastCAT
Platform
  • Oscar Dyson (DY)
Operation
  • DY1604_EK60
Last Modified: 2017-05-30
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