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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 DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
Principal Investigator Chris Wilson
DOC/NOAA/NMFS/AFSC > Alaska Fisheries Science Center
(206) 526-6435
chris.wilson@noaa.gov
Documentation links not available.
Resource Provider
  • DOC/NOAA/NESDIS/NGDC - National Geophysical Data Center
Publisher
  • DOC/NOAA/NESDIS/NGDC - National Geophysical Data Center
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.
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.
Time Period: 2012-06-08T00:47:44  to  2012-08-09T15:26:50
Spatial Reference System: urn:ogc:def:crs:EPSG:4326
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: 2014-07-14

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