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    • EK60 Water Column Sonar Data Collected During SH1601

    Metadata Updated: September 17, 2021

    Scientists from the Fishery Resource Analysis and Monitoring (FRAM) division at the Northwest Fisheries Science Center (NWFSC) led the winter 2016 hake IAT survey aboard the NOAA Ship Bell M. Shimada, a 63.7-m (209-foot), acoustically quieted Fisheries Survey Vessel equipped for fisheries and oceanographic research. The survey was conducted between January 9 and February 9 (Table 1). The Shimada surveyed from 45.5°N to 31.3°N, beginning at Newport, Oregon, proceeding south to the U.S./Mexico border, and then heading north back to Newport (Figures 1 and 2). Pre-planned (“coarse”) zigzag transects were oriented east-west, with larger offshore diagonals connected via smaller nearshore diagonals. Offshore diagonals, spaced roughly 100 nmi apart at the inshore side, ranged from the 30-m isobath (or as close to shore as was safely navigable) to bottoms depths of roughly 3,500–4,500 m. Nearshore diagonals extended from the ≥30-m contour to roughly 2,000 m. If hake were detected at the offshore end of a transect, the vessel proceeded west to the end of the hake sign and then beyond for an additional 0.5 nmi to ensure that the end of the aggregation was located. When aggregations of spawning hake were detected along a pre-planned transect and confirmed by midwater trawling, adaptive transects, either parallel at a fine resolution (spaced either 0.5 or 1.0 nmi apart) or in a star pattern, were used to determine the spatial extent and size of the spawning aggregation(s). Additional acoustic data were collected to evaluate crepuscular migration (vertical and/or horizontal) of spawning hake aggregations by having the Shimada remain stationary one hour before sunrise to one hour after.

    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 September 14, 2021
    Metadata Created Date November 12, 2020
    Metadata Updated Date September 17, 2021
    Reference Date(s) January 7, 2016 (creation), February 8, 2017 (publication)
    Frequency Of Update notPlanned

    Metadata Source

    Harvested from NGDC MGG Sonar Water Column

    Other Data Resources

    Additional Metadata

    Resource Type Series
    Metadata Date September 14, 2021
    Metadata Created Date November 12, 2020
    Metadata Updated Date September 17, 2021
    Reference Date(s) January 7, 2016 (creation), February 8, 2017 (publication)
    Responsible Party NOAA National Centers for Environmental Information (Point of Contact)
    Contact Email
    Guid gov.noaa.ngdc.mgg.wcd:SH1601_EK60
    Access Constraints Cite as: Northwest Fisheries Science Center. 2016. Water Column Sonar Data Collection (SH1601, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V5FF3QQV [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., Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose., Resource may not be available for up to one year after initial collection.
    Bbox East Long -117.30221
    Bbox North Lat 45.49275
    Bbox South Lat 31.3234
    Bbox West Long -128.13003
    Coupled Resource
    Frequency Of Update notPlanned
    Harvest Object Id 009b8d20-6e22-40d9-b6ef-d62ea33bb2c1
    Harvest Source Id ab8b0290-e4db-4a00-89f2-4e427c2054b2
    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 eng; USA
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-128.13003, 31.3234], [-117.30221, 31.3234], [-117.30221, 45.49275], [-128.13003, 45.49275], [-128.13003, 31.3234]]]}
    Progress completed
    Spatial Data Service Type
    Spatial Reference System urn:ogc:def:crs:EPSG::4326
    Spatial Harvester True
    Temporal Extent Begin 2016-01-07T21:43:41
    Temporal Extent End 2016-02-09T20:04:44

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