Acoustic-Trawl Survey of Walleye Pollock in the Gulf of Alaska (DY1706, ME70)

The Midwater Assessment and Conservation Engineering (MACE) program of NOAA Fisheries, Alaska Fisheries Science Center (AFSC) conducted an acoustic-trawl (AT) stock assessment survey along the Gulf of Alaska (GOA) shelf and associated bays during the late spring and summer of 2017 to estimate the distribution and abundance of walleye pollock (Gadus chalcogrammus). The survey was conducted 9 June-16 August aboard NOAA Ship Oscar Dyson, a 64 meter stern trawler equipped with acoustic and oceanographic instrumentation. The primary instrument for the survey was a Simrad EK60 split-beam echosounder system utilizing five frequencies (18, 38, 70, 120, and 200 kHz). A Simrad ME70 multibeam echosounder system was used during nighttime operations to evaluate the topography of the seafloor in various habitats for select (typically untrawable) areas. The vessel departed Kodiak, Alaska on 9 June and conducted the survey in three legs with all port calls in Kodiak; the project was completed with the arrival of the vessel in Kodiak on 16 August. Leg 1 of the project was conducted 9-28 June along the Gulf of Alaska (GOA) shelf from the Islands of Four Mountains to Outer Shumagin Trough (12-18, 20-21, 22, and 26-27 June). Leg 1 survey areas included Sanak Trough (19 June), Morzhovoi Bay (19-20 June), Pavlof Bay (21 June), Shumagin Islands area (23-25 and 26 June), and Mitrofania area (25 June); the vessel transited to Kodiak 27-28 June. The vessel departed Kodiak on 3 July to start leg 2 (3-28 July) and conducted survey work in Shelikof Strait (3-8 and 10 July), Nakchamik area (9 July), Alitak Bay (12-13 July), initial survey of Barnabas Trough (14-15 July), and GOA shelf (9-10, 10-12, and July). The vessel returned to Kodiak on 15 July, ending leg 2, due to mechanical issues and departed Kodak on 28 July to start leg 3. Leg 3 work included surveys of Chiniak Trough (28-29 July), Barnabas Trough (31 July-1 August), Marmot Bay (3-4 August), and completion of GOA shelf work (3 July; 2 and 4-14 August). The vessel transited to Kodiak Island (14-15 August) and ended the project in Kodiak on 16 August. Sphere calibrations of the EK60 and ME70 echosounder systems were conducted in Kalsin Bay, Kodiak Island, Alaska on 9 June with an additional EK60 calibration conducted at the end of the project on 16 August. Small surveys were conducted on select untrawlable habitat areas throughout the project using a Simrad ME70 multibeam echosounder system.
  • Cite as: Alaska Fisheries Science Center (2017): Water Column Sonar Data Collection (DY1706, ME70). National Centers for Environmental Information, NOAA. doi:10.7289/V5C827J3 [access date]
gov.noaa.ngdc.mgg.wcd:DY1706_ME70
Search Data
Distribution Formats
  • Simrad ME70 raw (.raw) format (Version: 1)
    • File Specification: Simrad ME70 raw files. See the Simrad ME70 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 2017-06-09T11:39:37 to 2017-08-12T13:13:57
Spatial Bounding Box Coordinates
N: 60.17117
S: 52.60697
E: -144.36042
W: -169.45381
Spatial Coverage Map
General Documentation
Associated Resources
    Publication Dates
    • creation: 2017-06-09
    Dataset Progress Status Complete - production of the data has been completed
    Data Update Frequency Not planned
    Purpose Acoustic-trawl (AT) survey of walleye pollock (Gadus chalcogrammus) along the Gulf of Alaska shelf and associated bays from the Islands of Four Mountains to Yakutat Bay, 9 June-16 August, 2017.
    Dataset Citation
    • Cite as: Alaska Fisheries Science Center (2017): Water Column Sonar Data Collection (DY1706, ME70). National Centers for Environmental Information, NOAA. doi:10.7289/V5C827J3 [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
    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 > SEA FLOOR
    Use Constraints
    • Cite as: Alaska Fisheries Science Center (2017): Water Column Sonar Data Collection (DY1706, ME70). National Centers for Environmental Information, NOAA. doi:10.7289/V5C827J3 [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/ 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 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 even with the vessel's keel), the transducers are nominally 6.1 meters below the surface. The ME70 multibeam echosounder system transducer is mounted on the ship's hull about 10 meters forward of the centerboard and about 1.5 meters to the port side of the vessel centerline. ME70 transmit pulses are synchronized with the EK60, with the EK60 providing its timing to the ME70. The EK60 and ME70 echosounder systems were calibrated at the start of the cruise in Kalsin Bay, Kodiak Island, Alaska 9 June 2017; the EK60 was again calibrated at the end of the cruise, 15 August 2017 also in Kalsin Bay.
    Acquisition Information (collection)
    Instrument
    • Simrad ME70
    • Simrad EK60
    • Knudsen CHIRP 3260
    • SBE 49 FastCAT
    Platform
    • Oscar Dyson (DY)
    Operation
    • DY1706_ME70
    Last Modified: 2018-01-23
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