gov.noaa.nmfs.inport:64623 eng UTF8 dataset Other 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 McCarthy, Abigail abigail.mccarthy@noaa.gov 2065264129 pointOfContact 2026-03-04T19:17:27 ISO 19115-2 Geographic Information - Metadata Part 2 Extensions for imagery and gridded data ISO 19115-2:2009(E) Results of 2017 Chukchi Sea Acoustic/Trawl Survey Results of 2017 Chukchi Sea Acoustic/Trawl Survey 2021 publication NOAA/NMFS/EDM 64623 https://www.fisheries.noaa.gov/inport/item/64623 WWW:LINK-1.0-http--link Full Metadata Record View the complete metadata record on InPort for more information about this dataset. information https://www.sciencedirect.com/science/article/pii/S0967064516300297 WWW:LINK-1.0-http--link Abundance and distribution of Arctic cod (Boreogadus saida) and other pelagic fishes over the U.S. Continental Shelf of the Northern Bering and Chukchi Seas Link to publication download We conducted acoustic-trawl (AT) surveys of the US continental shelf region of the Chukchi Sea during ice-free periods (1 August to 27 September) with a focus on Arctic cod (Boreogadus saida), a key species in Arctic ecosystems. These surveys indicate that midwater fishes are dominated by age-0 Arctic cod, with large numbers of age-0 walleye pollock (Gadus chalcogrammus) found in the region for the first time. Age-0 Arctic cod abundances were significantly larger than observed in previous surveys. Age-0 Arctic cod were distributed north of 68 °N with the highest densities in the northeastern Chukchi Sea, and age-0 pollock were found throughout the region north of 66 °N. Additional key pelagic species included capelin (Mallotus villosus), saffron cod (Eleginus gracilis), and Pacific cod (Gadus macrocephalus). These three species were primarily found in coastal areas between 66.5-72 °N. As had been previously observed, sizeable populations of age-0 Arctic cod were observed in the northern Chukchi Sea, which suggests that this area is an important nursery ground. The increase in age-0 pollock abundance suggests that environmental conditions now enable species from the south to colonize the Chukchi Sea, at least on a seasonal basis. There is substantial interest in the fishes of the Pacific Arctic region (northern Bering, Chukchi and Beaufort Seas) due to their important role in the food web, and the potential for human activities to influence these species. The arctic environment is changing rapidly. Sea ice extent and thickness has decreased and temperatures have increased dramatically in recent years. Temperatures have warmed and sea ice has declined faster than predicted by models, and there is substantial concern about the impacts of these changes on the ecosystem. Ecological research in the region has been sporadic. However, recent concern about the potential impacts of climatic changes and the impacts of human activities such as oil and gas development on the ecosystem has stimulated a substantial amount of sampling of fishes in the Pacific Arctic. Previous surveys in the area determined that pelagic fishes were dominated by large numbers of age-0 Arctic cod (Boreogadus saida), but that very few adults were present in the region. The lack of adults suggests that survivorship of age-0 Arctic cod is either very low or that these juvenile Arctic cod emigrate to other areas as they grow. To evaluate the role of the region as a nursery for these age-0 fish and how changes in the physical environment may further influence the ecosystem, we conducted two broad-scale acoustic-trawl surveys of the continental shelf of the ice-free U.S. Chukchi Sea in late summer 2017 and 2019. The work was conducted as part of the Arctic Integrated Ecosystem Survey program. completed DeRobertis, Alex 206 526 4789 alex.derobertis@noaa.gov pointOfContact Towler, Rick rick.towler@noaa.gov custodian asNeeded Acoustic trawl surveys Arctic cod (Boreogadus saida) Arctic zone Chukchi Sea Northern Bering Sea Pacific cod (Gadus macrocephalus) Pacific herring (Clupea pallasii) Walleye pollock (Gadus chalcogrammus) capelin (Mallotus villosus) midwater trawl pelagic fish saffron cod (Eleginus gracilis) theme 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: Chukchi Sea Acoustic/Trawl Survey project InPort otherRestrictions Cite As: Alaska Fisheries Science Center, [Date of Access]: Results of 2017 Chukchi Sea Acoustic/Trawl Survey [Data Date Range], https://www.fisheries.noaa.gov/inport/item/64623. 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. unclassified NOAA Data Management Plan (DMP) NOAA/NMFS/EDM 64623 https://www.fisheries.noaa.gov/inportserve/waf/noaa/nmfs/afsc/dmp/pdf/64623.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 Chukchi Sea: http://www.marineregions.org/gazetteer.php?p=details&id=4257 Gulf of Alaska: http://www.marineregions.org/gazetteer.php?p=details&id=4312 2012-06-01 2013-11-01 dataset 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