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DY1207 Bering Sea ME70

Scientists from the Midwater Assessment and Conservation Engineering (MACE) Program of the Alaska Fisheries Science Center (AFSC) have conducted summer surveys to estimate the abundance and distribution of walleye pollock (Theragra chalcogramma) on the eastern Bering Sea (EBS) shelf since 1979. Surveys have been conducted either annually or biennially since 1994. The 2012 acoustic-trawl (AT) survey was carried out between 7 June and 10 August aboard the NOAA ship Oscar Dyson. Its primary objective was to collect acoustic and trawl information to estimate walleye pollock midwater abundance and distribution on the U.S. and Russian Bering Sea shelf. Additional survey sampling included conductivity-temperature-depth (CTD) and expendable bathythermograph (XBT) casts to characterize the Bering Sea shelf physical environment, and supplemental trawls to improve acoustic species classification and to obtain an index of euphausiid abundance using multiple frequency techniques. A number of specialized sampling devices were used during the survey, including light level sensors; a Simrad ME70 multibeam sonar to image fish schools; an 83-112 bottom trawl modified to sample fish in midwater; a trawl-mounted stereo camera ("Cam-Trawl") designed to identify species and determine size and density of animals as they pass by the camera during a haul, and a small, bottom-moored, trigger camera system to autonomously collect images of fish on the seafloor.

Cite as: Alaska Fisheries Science Center (2012): Water Column Sonar Data Collection (DY1207, ME70). National Geophysical Data Center, NOAA. doi:10.7289/V5KK98PX [access date]

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Distribution Formats
  • Simrad ME70 raw files (Version: 1)
Distributor Distributor information not available
No point of contact available for this dataset
Documentation links not available.
Resource Provider
  • Dataset contact information not available
Publisher
    Date(s)
    • creation: 2012-06-08
    Dataset Progress Status Complete
    Data Update Frequency: Not planned
    Purpose: Acoustic-Trawl Survey of Walleye Pollock (Theragra chalcogramma) on the Bering Sea shelf. Data were collected on fish distributions and school characteristics using the EK60 scientific echosounder and the ME70 multi-beam echosounder.
    Time Period: 2012-06-08T00:47:44  to  2012-08-09T15:26:50
    Spatial Reference System:
    Spatial Bounding Box Coordinates:
    N: 63.2933313333
    S: 53.8521558333
    E: -162.007
    W: 178.324
    Spatial Coverage Map:
    Themes
    • EARTH SCIENCE > Oceans > Ocean Acoustics > Acoustic Scattering
    • EARTH SCIENCE > Oceans > Aquatic Sciences > Fisheries
    • EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Bathymetry
    • EARTH SCIENCE > Biosphere > Aquatic Ecosystems
    • EARTH SCIENCE > Biosphere > Aquatic Ecosystems > Marine Habitat
    • EARTH SCIENCE > Biosphere > Aquatic Ecosystems > Benthic Habitat
    • EARTH SCIENCE > Biosphere > Aquatic Ecosystems > Pelagic Habitat
    • EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Seafloor Topography
    Data Centers
    • 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
    Instruments
    • In Situ/Laboratory Instruments > Profilers/Sounders > Acoustic Sounders > WCMS > Water Column Mapping System
    Places
    • Bering Sea
    • Global
    • Sea Floor
    Use Constraints
    • Cite as: Alaska Fisheries Science Center (2012): Water Column Sonar Data Collection (DY1207, ME70). National Geophysical Data Center, NOAA. doi:10.7289/V5KK98PX [access date]
    Access Constraints
    • Resource will be available one year after initial collection.
    Fees
    • Free
    Lineage Statement Lineage statement not available.

    Metadata Last Modified: 2015-08-12

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