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  • DY1207 Bering Sea ME70

    Metadata Updated: October 13, 2020

    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.

    Access & Use Information

    License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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    Dates

    Metadata Date May 30, 2017
    Metadata Created Date October 13, 2020
    Metadata Updated Date October 13, 2020
    Reference Date(s) June 8, 2012 (creation)
    Frequency Of Update notPlanned

    Metadata Source

    Harvested from NGDC MGG Sonar Water Column

    Additional Metadata

    Resource Type Series
    Metadata Date May 30, 2017
    Metadata Created Date October 13, 2020
    Metadata Updated Date October 13, 2020
    Reference Date(s) June 8, 2012 (creation)
    Responsible Party DOC/NOAA/NMFS/AFSC > Alaska Fisheries Science Center (Principal Investigator)
    Contact Email
    Access 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], 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 will be available one year after initial collection.
    Bbox East Long -162.007
    Bbox North Lat 63.2933313333
    Bbox South Lat 53.8521558333
    Bbox West Long 178.324
    Coupled Resource
    Frequency Of Update notPlanned
    Guid gov.noaa.ngdc.mgg.wcd:DY1207_ME70
    Harvest Object Id e7a03a7a-1d8a-4081-a748-94329a6b08ab
    Harvest Source Id 05749f71-eeac-4431-872a-137d664b78cc
    Harvest Source Title NGDC MGG Sonar Water Column
    Licence 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.
    Metadata Language
    Metadata Type geospatial
    Progress completed
    Spatial Data Service Type
    Spatial Reference System urn:ogc:def:crs:EPSG:4326
    Spatial Harvester True
    Temporal Extent Begin 2012-06-08T00:47:44
    Temporal Extent End 2012-08-09T15:26:50

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