gov.noaa.nmfs.inport:12859 eng UTF8 dataset 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 2026-03-04T23:23:25 ISO 19115-2 Geographic Information - Metadata Part 2 Extensions for imagery and gridded data ISO 19115-2:2009(E) AFSC/REFM: Acoustic trawl cooperative survey near Shumagin Islands 2007-2013 AFSC/REFM: Acoustic trawl cooperative survey near Shumagin Islands 2007-2013 publication NOAA/NMFS/EDM 12859 https://www.fisheries.noaa.gov/inport/item/12859 WWW:LINK-1.0-http--link Full Metadata Record View the complete metadata record on InPort for more information about this dataset. information Dorn, Martin 7600 Sand Point Way, NE Seattle WA 98115-6349 Martin.Dorn@noaa.gov originator Alaska Fisheries Science Center (206) 526-4000 (206) 526-4004 7600 Sand Point Way N.E., Building 4 Seattle WA 98115 USA afsc.webmaster@noaa.gov https://www.fisheries.noaa.gov/about/alaska-fisheries-science-center WWW:LINK-1.0-http--link Alaska Fisheries Science Center Website AKFSC Home Page information 0700-1700 Pacific Time originator mapDigital In May of 2006, scientists from the Alaska Fisheries Science Center participated in a pilot outreach program in Sand Point, Alaska. At the meetings, fishermen raised a number of concerns about the adequacy of walleye pollock (Theragra chalcogramma) assessment. The issues appeared to be related to the contrasting observational scales of fishermen and National Marine Fisheries Service (NMFS) scientists responsible for conducting assessment surveys and population modeling. NMFS resource assessment surveys have a large spatial scale (i.e., the entire Gulf of Alaska) and occur infrequently as they are biennial summer bottom trawl and acoustic-trawl surveys, with annual or biennial winter acoustic-trawl surveys targeting key spawning areas(von Szalay, et al. 2010; Guttormsen and Yasenak, 2007; Guttormsen and Jones, 2010). The stock assessment model for pollock estimates stock abundance for the central and western Gulf of Alaska (Dorn et al., 2011). In contrast, the observational scale of fishermen is spatially restricted but temporally extensive, since they are on the water fishing throughout the year. Fishermen questioned whether NMFS assessment activities were appropriately designed to monitor the status of pollock in their area. They noted that additional surveys in different seasons and a more comprehensive acoustic-trawl survey effort in winter could help address seasonal issues such as movement between spawning and feeding areas. Cooperative research projects with the Sand Point fishing community were identified as a potential approach for addressing some of these issues, but fishermen wanted the assurance that their investment of time and effort will lead to improvements in stock assessment. The acoustic-trawl surveys described in this report resulted from collaboration between NMFS scientists, the Aleutian East Borough, and local fishermen to address issues raised during the outreach program. Acoustic-trawl surveys were conducted from a local fishing vessel in the western Gulf of Alaska during 2007-2013. To some extent, the surveys carried out during this period reflected shifting program objectives. The initial objective was simply to demonstrate the feasibility of using local fishing vessels to conduct acoustic-trawl surveys and to collect acoustic and biological information sufficient to estimate walleye pollock biomass and spatial pattern. Once this was demonstrated, the focus of the project expanded to include other objectives. Specific objectives of the project were the following: Evaluate the feasibility of conducting acoustic-trawl surveys of pollock using local fishing vessels. Evaluate the quality of acoustic data collected from the Simrad ES60 echosounder. Evaluate the appropriateness of the design of the current NMFS acoustic-trawl surveys in the western Gulf of Alaska. Specific issues to be addressed included 1) transect density in bathymetrically complex regions in the western Gulf of Alaska, 2) day/night differences in pollock density, and 3) temporal variability of pollock density during replicate transects. Evaluate the timing of the NMFS survey (mid-February) in Sanak Trough by conducting a survey in January prior to the NMFS survey. Evaluate relationships between adult pollock density, young-of-the-year pollock density, euphausiid density, and the distribution of foraging humpback whales (Megaptera novaeangliae). The estimates of abundance and distribution of walleye pollock were developed for areas covered by cooperative acoustic-trawl surveys conducted aboard a fishing vessel during alternate Septembers and Januarys between 2007-2013. Physical oceanographic and biological composition observations, initial findings from ancillary data collections of marine mammal observations, and dual-frequency differencing techniques to discriminate different types of acoustic backscatter were also developed. cooperative research, outreach Suzanne Romain, Vidar Wespestad completed Barbeaux, Steve 7600 Sand Point Way, NE Seattle WA 98115-6349 Steve.Barbeaux@noaa.gov pointOfContact Haltuch, Melissa A 206-860-3480 2725 Montlake Boulevard East Seattle WA 98112 melissa.haltuch@noaa.gov custodian notPlanned https://www.afsc.noaa.gov/metadata-images/REFM/SSMAshum.jpg Collection location map. url Fishery-Dependent Tracked Asset theme Fisheries CTD abundance acoustic backscatter line-transect survey theme fall winter temporal Alaska Gulf of Alaska Shumagin Islands 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 Fish Abundance Surveys project InPort otherRestrictions Cite As: Alaska Fisheries Science Center, [Date of Access]: AFSC/REFM: Acoustic trawl cooperative survey near Shumagin Islands 2007-2013 [Data Date Range], https://www.fisheries.noaa.gov/inport/item/12859. 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 has been analyzed and is available for distribution. Contact the Point Of Contact. otherRestrictions Use Constraints: User must read and fully comprehend the metadata prior to use. Applications or inferences derived from the data should be carefully considered for accuracy. Acknowledgement of NOAA/NMFS/AFSC, as the source from which these data were obtained in any publications and/or other representations of these, data is suggested. unclassified NOAA Data Management Plan (DMP) NOAA/NMFS/EDM 12859 https://www.fisheries.noaa.gov/inportserve/waf/noaa/nmfs/afsc/dmp/pdf/12859.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 biota oceans AccessSQLserverExcel -162.3 -160 54.4 55.4 Shumagin Islands to Sanak Islands, AK | Currentness: Ground Condition 2007 2013 false eng false Data File data files 2016-05-05 publication dataset Accuracy multi year calibrations indicate a stable acoustic system for 38kHz, 120kHz Completeness Report exploratory survey, some areas with multi year coverage. Conceptual Consistency relational db, acoustic calibration, noise removal, bottom editing View metadata record as uploaded FGDC record.