gov.noaa.nmfs.inport:22011 eng UTF8 dataset Binary Alaska Fisheries Science Center 7600 Sand Point Way N.E., Building 4 Seattle WA 98115 USA https://www.afsc.noaa.gov WWW:LINK-1.0-http--link Website Website for this organization information 0700-1700 Pacific Time resourceProvider 2025-05-15T19:15:45 ISO 19115-2 Geographic Information - Metadata Part 2 Extensions for imagery and gridded data ISO 19115-2:2009(E) AFSC/RACE/MACE: Results of 2009 ACOUSTIC-TRAWL SURVEYS OF THE SHUMAGINS, SANAK TROUGH & WESTERN GULF OF ALASKA SHELFBREAK DY0901 2009 ACOUSTIC-TRAWL SURVEYS OF THE SHUMAGINS, SANAK TROUGH & WESTERN GULF OF ALASKA SHELFBREAK DY0901 publication NOAA/NMFS/EDM 22011 https://www.fisheries.noaa.gov/inport/item/22011 WWW:LINK-1.0-http--link Full Metadata Record View the complete metadata record on InPort for more information about this dataset. information Guttormsen, Mike mike.guttormsen@noaa.gov originator Scientists from the Midwater Assessment and Conservation Engineering (MACE) Program of the Alaska Fisheries Science Center's (AFSC) Resource Assessment and Conservation Engineering (RACE) Division routinely conduct echo integration-trawl (EIT) stock assessment surveys in the Gulf of Alaska (GOA) during late winter and early spring to estimate the distribution and abundance of walleye pollock (Theragra chalcogramma). Surveys were conducted in the Shumagin Islands area in 1994-96, 2001-03, and 2005-07 and along the GOA continental shelf break east of Chirikof Island to Barnabas Trench in 2002-07. This report presents the distribution and abundance of walleye pollock for surveys conducted in the Shumagins during February and March 2009. Collect echo integration data and trawl data necessary to determine the distribution, biomass, and biological composition of walleye pollock in the Shumagins area; Collect pollock target strength data using hull-mounted or lowered transducers for use in scaling echo integration data to estimates of absolute abundance; Calibrate the ER60 and ME70 acoustic system using standard sphere calibration techniques; Conduct a codend-comparison experiment; Collect physical oceanographic data (temperature and salinity profiles) at selected sites, and continuously collect sea surface temperature and salinity data. The Shumagins region is a critical spawning ground for walleye pollock and annual surveys of pollock age structure and biomass are used to inform GOA pollock stock assesment models. In particular, there is a strong correlation between the abundance of age-1 pollock in the Shumagin Islands survey and year-class strength for the GOA region. underDevelopment Guttormsen, Mike mike.guttormsen@noaa.gov pointOfContact Towler, Rick rick.towler@noaa.gov custodian asNeeded Acoustic Trawl surveys; Theragra chalcogramma; Midwater trawls; Bottom trawls; echo integration-trawl (EIT) surveys; theme Western Gulf of Alaska shelfbreak; Shumagin Islands; Sanak Trough; Sanak Shelfbreak; Chirikof Shelfbreak; Shelikof Strait; Marmot Bay; eastern Shumagin Trough; place DOC/NOAA/NMFS/AFSC > Alaska Fisheries Science Center, National Marine Fisheries Service, NOAA, U.S. Department of Commerce dataCentre Global Change Master Directory (GCMD) Data Center Keywords 2017-04-24 publication 8.5 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 22. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian AFSC/RACE/MACE: Pollock Acoustic/Trawl Survey Spawning Annual Shumagins project InPort otherRestrictions Cite As: Alaska Fisheries Science Center, [Date of Access]: AFSC/RACE/MACE: Results of 2009 ACOUSTIC-TRAWL SURVEYS OF THE SHUMAGINS, SANAK TROUGH & WESTERN GULF OF ALASKA SHELFBREAK DY0901 [Data Date Range], https://www.fisheries.noaa.gov/inport/item/22011. NOAA provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. It is the responsibility of the user to determine whether or not the data is suitable for the intended purpose. otherRestrictions Access Constraints: The data set is still being analyzed and will not be available for distribution until it has been finalized and all QA/QC practices have been performed. Contact the Data Point Of Contact for estimated time of release. otherRestrictions Use Constraints: User must read and fully comprehend the metadata prior to use. User must acknowledge the Originator when using the data set as a source. User must share data products developed using the source data set with the Originator. Data should not be used beyond the limits of the source scale. unclassified NOAA Data Management Plan (DMP) NOAA/NMFS/EDM 22011 https://www.fisheries.noaa.gov/inportserve/waf/noaa/nmfs/afsc/dmp/pdf/22011.pdf WWW:LINK-1.0-http--link NOAA Data Management Plan (DMP) NOAA Data Management Plan for this record on InPort. information crossReference eng; US oceans Gulf of Alaska: http://www.marineregions.org/gazetteer.php?p=details&id=4312 | Currentness: Ground Condition 2009-02-13 2009-03-31 Acoustic Systems: Simrad ER60 echosounder (18, 38, 70, 120 & 200 kHz) and Simrad ME70 multibeam echosounder. Nets: Midwater = Aleutian wing trawl (headrope/foot rope = 270 ft, vertical opening = 90 ft, codend liners = ? in.; Bottom = Poly Nor'eastern bottom trawl (headrope = 90 ft, footrope = 105 ft, vertical opening = 19 ft, codend liner = 1? in.) Research: lowered 38 kHz acoustic system, multi opening/closing codend (MOCC) dataset Completeness Report There was no sampling during the dates of February 21- March 19. Acoustic data were recorded at the five split-beam frequencies using ER60 software and, as a backup, acoustic telegram data were logged with Myriax EchoLog 500 software. Acoustic measurements were collected from 16 m below the sea surface to within 0.5 m of the sounder-detected bottom or a maximum of 1,000 m in deep water. Data were analyzed using Myriax Echoview post-processing software. See National Marine Fisheries Service (NMFS) 2013. NOAA protocols for fisheries acoustics surveys and related sampling (Alaska Fisheries Science Center), 23 p. Prepared by Midwater Assessment and Conservation Engineering Program, Alaska Fish. Sci. Center, Natl. Mar. Fish. Serv., NOAA. Available online: http://www.afsc.noaa.gov/RACE/midwater/AFSC%20AT%20Survey%20Protocols_Feb%202013.pdf