Gulf of Alaska Acoustic-Trawl Survey of Walleye Pollock (DY1302, EK60)
The Midwater Assessment and Conservation Engineering (MACE) program of NOAA National Marine Fisheries Service (NMFS), Alaska Fisheries Science Center (AFSC) conducted acoustic-trawl (AT) stock assessment surveys in the Gulf of Alaska (GOA) during the winter of 2013 to estimate the distribution and abundance of walleye pollock (Gadus chalcogrammus). The vessel departed Kodiak, Alaska on 7 February, conducted EK60 echosounder system calibration on 9 February, then returned to Kodiak due to vessel mechanical issues on 12 February. The vessel departed Kodiak on 24 February following repairs, arriving at the start of the first survey on 26 February. The Shumagin Islands survey was conducted 26 February to 1 March and included Shumagin Trough, Stepovak Bay, Renshaw Point, Unga Strait, and West Nagai Strait. The Sanak Trough survey was conducted on 2 March, followed by the Morzhovoi Bay survey on 3 March; the vessel arrived in Kodiak on 4 March. The survey was conducted aboard NOAA Ship Oscar Dyson, a 64 meter stern trawler equipped with acoustic and oceanographic instrumentation.
Dataset Citation
- Cite as: Alaska Fisheries Science Center (2013): Water Column Sonar Data Collection (DY1302, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V59Z92WF [access date]
Dataset Identifiers
- DY1302_EK60
- doi:10.7289/V59Z92WF
ISO 19115-2 Metadata
gov.noaa.ngdc.mgg.wcd:DY1302_EK60
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Ordering Instructions | Contact the NCEI Water Column Sonar Data Manager to order data |
Distributor | Water Column Sonar Data Manager NOAA National Centers for Environmental Information (303) 497-4742 wcd.info@noaa.gov |
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 | 2013-02-07T19:05:03 to 2013-03-05T03:47:48 |
Spatial Reference System | urn:ogc:def:crs:EPSG:4326 |
Spatial Bounding Box Coordinates |
West: -163.30879
East: -152.02608
South: 54.44067
North: 58.01631
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Dataset Progress Status | Complete - production of the data has been completed |
Data Update Frequency | Not planned |
Purpose | Acoustic-trawl (AT) surveys of walleye pollock (Gadus chalcogrammus) in the Shumagin Islands, Sanak Trough, and Morzhovoi Bay areas of the Gulf of Alaska, 7 February to 4 March 2013. |
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International Hydrographic Organization (IHO) Sea Area ("Limits of Oceans and Seas" publication S-23)
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Lineage Statement | The primary instrumentation for the survey was a Simrad EK60 split-beam echosounder system utilizing five frequencies (18, 38, 70, 120, and 200 kHz). The EK60 transducers installed on the 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 flush with the vessel's keel), the transducers are nominally 6.1 meters below the surface. The EK60 system was calibrated on 9 February, 2013 in Volcano Bay, Kodiak Island, Alaska Peninsula, Alaska. |
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Last Modified: 2017-05-30
For questions about the information on this page, please email: wcd.info@noaa.gov
For questions about the information on this page, please email: wcd.info@noaa.gov