Gulf of Alaska Acoustic-Trawl Survey of Walleye Pollock (DY1403, EK60)
The Midwater Assessment and Conservation Engineering (MACE) program of NOAA National
Marine Fisheries Service (NMFS), Alaska Fisheries Science Center (AFSC) conducted
an acoustic-trawl (AT) stock assessment survey in the Shelikof Strait, Marmot Bay,
and Izhut Bay areas of the Gulf of Alaska (GOA) during late winter/early spring of
2014 to estimate the distribution and abundance of walleye pollock (Gadus chalcogrammus).
The survey was conducted 13-25 March (Shelikof Strait 15-22 March; Marmot and Izhut
Bays 22-24 March), departing from Dutch Harbor, Alaska and ending in Kodiak, Alaska.
The survey was conducted aboard NOAA Ship Oscar Dyson, a 64 meter stern trawler equipped
with acoustic and oceanographic instrumentation. The primary instrument for the survey
was a Simrad EK60 split-beam echosounder system utilizing five frequencies (18, 38,
70, 120, and 200 kHz).
- Cite as: Alaska Fisheries Science Center (2014): Water Column Sonar Data Collection (DY1403, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V5J964BK [access date]
- DY1403_EK60
- doi:10.7289/V5J964BK
gov.noaa.ngdc.mgg.wcd:DY1403_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 | 2014-03-13T20:48:18 to 2014-03-25T03:12:49 |
Spatial Reference System | urn:ogc:def:crs:EPSG:4326 |
Spatial Bounding Box Coordinates |
West:-166.52837
East:-151.67651
South:53.89422
North:58.46687
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Dataset Progress Status | Complete - production of the data has been completed |
Data Update Frequency | Not planned |
Purpose | Acoustic-trawl (AT) survey of walleye pollock (Gadus chalcogrammus) in the Shelikof Strait, Marmot Bay, and Izhut Bay areas of the Gulf of Alaska |
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Theme keywords | Global Change Master Directory (GCMD) Science Keywords
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Data Center keywords | Global Change Master Directory (GCMD) Data Center Keywords
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Instrument keywords | Global Change Master Directory (GCMD) Instrument Keywords
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Place keywords | International Hydrographic Organization (IHO) Sea Area ("Limits of Oceans and Seas"
publication S-23)
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Lineage Statement | 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. |
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Last Modified: 2017-05-30
For questions about the information on this page, please email:wcd.info@noaa.gov