Acoustic-Trawl Survey of Walleye Pollock in the Gulf of Alaska (DY1503, EK60)

Metadata Updated: February 8, 2018

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 Chirikof shelf break areas of the Gulf of Alaska (GOA) during late winter/early spring of 2015 to estimate the distribution and abundance of walleye pollock (Gadus chalcogrammus). The survey was conducted 15-31 March (Marmot Bay, 15-16 March; Shelikof Strait 17-23 March; Chirikof shelf break, 23-24 March), starting 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).

Access & Use Information

Downloads & Resources

Dates

Metadata Date May 30, 2017
Metadata Created Date September 5, 2016
Metadata Updated Date February 8, 2018
Reference Date(s) March 15, 2015 (creation)
Frequency Of Update notPlanned

Metadata Source

Harvested from NOAA CSW Harvest Source

Additional Metadata

Resource Type Series
Metadata Date May 30, 2017
Metadata Created Date September 5, 2016
Metadata Updated Date February 8, 2018
Reference Date(s) March 15, 2015 (creation)
Responsible Party DOC/NOAA/NMFS/AFSC > Alaska Fisheries Science Center (Principal Investigator)
Contact Email
Access Constraints Cite as: Alaska Fisheries Science Center (2015): Water Column Sonar Data Collection (DY1503, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V53R0QT2 [access date], Resource may not be available for up to one year after initial collection.
Bbox East Long -151.61283
Bbox North Lat 58.55018
Bbox South Lat 55.60306
Bbox West Long -156.72228
Coupled Resource
Frequency Of Update notPlanned
Guid gov.noaa.ngdc.mgg.wcd:DY1503_EK60
Harvest Object Id 7bd146eb-f0be-4b1b-9237-2c9e3c6460d7
Harvest Source Id 2aed8e29-fc5b-4cde-aa66-fb1118fd705e
Harvest Source Title NOAA CSW Harvest Source
Licence While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, 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., 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 2015-03-15T00:37:49
Temporal Extent End 2015-03-31T16:04:29

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