gov.noaa.nmfs.inport:25327 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 2026-03-04T19:17:18 ISO 19115-2 Geographic Information - Metadata Part 2 Extensions for imagery and gridded data ISO 19115-2:2009(E) AFSC/REFM: Isolation by distance (IBD) Alaskan fish stock structure modeling AFSC/REFM: Isolation by distance (IBD) Alaskan fish stock structure modeling 2015-08 publication NOAA/NMFS/EDM 25327 https://www.fisheries.noaa.gov/inport/item/25327 WWW:LINK-1.0-http--link Full Metadata Record View the complete metadata record on InPort for more information about this dataset. information Spies, Ingrid ingrid.spies@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 https://accession.nodc.noaa.gov/0130929/data/0-data/Spies_metadata_file_descriptions.rtf WWW:LINK-1.0-http--link Metadata descriptions Download link (6kb) download tableDigital Spies, I., Spencer, P. D., & Punt, A. E. (2015). Where do we draw the line? A simulation approach for evaluating management of marine fish stocks with isolation-by-distance stock structure. Canadian journal of fisheries and aquatic sciences, 72(7), 968-982. There is no established management protocol for stocks subject to isolation-by-distance (IBD) stock structure. This study examines several management strategies for two marine fish species subject to IBD using simulation, Pacific cod in the Aleutian Islands (AI) and northern rockfish in the Eastern Bering Sea (EBS) and Aleutian Islands. A one-dimensional stepping stone model was used to model isolation by distance, and was intended to mimic regions where marine species are exploited along a continental shelf. The performance of spatial assessment and management methods depended on how the range was split. Splitting anywhere within the managed area led to fewer demes falling below target and threshold biomass levels and higher yield than managing the entire area as a single unit. Equilibrium yield was maximized when each deme was assessed and managed separately and under catch cascading, in which harvest quotas within a management unit are spatially allocated based upon the distribution of survey biomass. The longer-lived rockfish declined more slowly than Pacific cod, and experienced greater depletion in biomass under disproportionate fishing effort due to lower productivity. Overall, splitting a management area of the size simulated in the model improved performance measures, and the optimal management strategy grouped management units by demes with similar relative fishing effort. To examine how best to manage stocks subject to genetic isolation-by-distance stock structure. completed Spies, Ingrid ingrid.spies@noaa.gov pointOfContact Spies, Ingrid ingrid.spies@noaa.gov custodian notPlanned Gadus macrocephalus Isolation by distance stock structure Pacific cod Sebastes polyspinis fisheries management genetics groundfish northern rockfish spatial management theme Aleutian Islands Bering Sea 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 Modeled data project InPort otherRestrictions Cite As: Alaska Fisheries Science Center, [Date of Access]: AFSC/REFM: Isolation by distance (IBD) Alaskan fish stock structure modeling [Data Date Range], https://www.fisheries.noaa.gov/inport/item/25327. 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: There are no legal restrictions on access to the data. They reside in public domain and can be freely distributed. 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 25327 https://www.fisheries.noaa.gov/inportserve/waf/noaa/nmfs/afsc/dmp/pdf/25327.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 R data 170 -160 50 62 Bering Sea and Aleutian Islands | Currentness: publication 2015 false eng false Data File data files 2016-04-28 publication NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact WWW:LINK-1.0-http--link NCEI Contact Information Information for contacts at NCEI. information distributor https://accession.nodc.noaa.gov/0130929 WWW:LINK-1.0-http--link https://accession.nodc.noaa.gov/0130929 download dataset Completeness Report The simulation is based on data from 1991-2012 for Pacific cod and 1980-2012 for northern rockfish. Conceptual Consistency Not applicable. See FGDC methods.