Gulf of Alaska Acoustic-Trawl Surveys of Walleye Pollock (DY1002, 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
late winter/early spring of 2010 to estimate the distribution and abundance of walleye
pollock (Theragra chalcogramma). The vessel departed Kodiak, Alaska on 18 March and
conducted a survey along the central Gulf of Alaska shelf east of Chirikof Island
18-19 March. The vessel conducted fisheries research operations on Snakehead shelf
19-22 March. The vessel then surveyed Shelikof Strait 22-28 March and returned to
Kodiak, Alaska on 30 March following a post-cruise EK60 echosounder system calibration
29-30 March. The survey was conducted aboard NOAA Ship Oscar Dyson, a 64 meter stern
trawler equipped with acoustic and oceanographic instrumentation.
- Cite as: Alaska Fisheries Science Center (2010): Water Column Sonar Data Collection (DY1002, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V5QJ7F96 [access date]
- DY1002_EK60
- doi:10.7289/V5QJ7F96
gov.noaa.ngdc.mgg.wcd:DY1002_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 | 2010-03-18T02:30:08 to 2010-03-30T15:06:04 |
Spatial Reference System | urn:ogc:def:crs:EPSG:4326 |
Spatial Bounding Box Coordinates |
West:-157.0034
East:-151.86566
South:55.52075
North:58.74647
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Documentation links not available. |
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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 (Theragra chalcogramma) along the Chirikof shelf break and Shelikof Strait areas of the Gulf of Alaska, 18-30 March 2010 |
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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 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 prior to the start of the cruise on 22 February 2010 in Three Saints Bay, Kodiak Island, Alaska and at the end of the cruise also in Three Saints Bay on 29 March 2010. |
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Last Modified: 2017-05-30
For questions about the information on this page, please email:wcd.info@noaa.gov