25327 AFSC/REFM: Isolation by distance (IBD) Alaskan fish stock structure modeling Data Set Published / External 24500 Modeled data Project Completed 2015-08 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. Loaded by FGDC Metadata Uploader, batch 6894, 08-24-2015 12:52 The following FGDC sections are not currently supported in InPort, but were preserved and will be included in the FGDC export: - Taxonomy (FGDC:taxonomy) 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. Theme ISO 19115 Topic Category biota Theme ISO 19115 Topic Category oceans Theme Gadus macrocephalus Theme Isolation by distance stock structure Theme Pacific cod Theme Sebastes polyspinis Theme fisheries management Theme genetics Theme groundfish Theme northern rockfish Theme spatial management Spatial Aleutian Islands Spatial Bering Sea National Centers for Environmental Information - Silver Spring, Maryland Silver Spring MD Data Set None Planned Table (digital) na na na 32109 Published / External Data File Data Steward 2015-10-19 Person Spies, Ingrid ingrid.spies@noaa.gov Distributor 2015 Organization NOAA National Centers for Environmental Information NCEI ncei.info@noaa.gov https://ror.org/04r0wrp59 https://www.ncei.noaa.gov/contact NCEI Contact Information Information for contacts at NCEI. Online Resource Originator 2015-08-24 Person Spies, Ingrid ingrid.spies@noaa.gov Originator 2015-08-24 Organization Alaska Fisheries Science Center AFSC afsc.webmaster@noaa.gov https://ror.org/01h7fye62 7600 Sand Point Way N.E., Building 4 Seattle WA 98115 USA (206) 526-4000 (206) 526-4004 https://www.fisheries.noaa.gov/about/alaska-fisheries-science-center AKFSC Home Page Online Resource 0700-1700 Pacific Time Point of Contact 2015-08-24 Person Spies, Ingrid ingrid.spies@noaa.gov publication 170 -160 62 50 Bering Sea and Aleutian Islands Discrete 2015 Unclassified na There are no legal restrictions on access to the data. They reside in public domain and can be freely distributed. 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. https://accession.nodc.noaa.gov/0130929 https://accession.nodc.noaa.gov/0130929/data/0-data/Spies_metadata_file_descriptions.rtf Metadata descriptions Online Resource Download link (6kb) R data The simulation is based on data from 1991-2012 for Pacific cod and 1980-2012 for northern rockfish. Not applicable. See FGDC methods. No Unknown Yes No no unknown na NCEI-MD unknown IT Security and Contingency Plan for the system establishes procedures and applies to the functions, operations, and resources necessary to recover and restore data as hosted in the Western Regional Support Center in Seattle, Washington, following a disruption. 1 See FGDC methods. 32109 Entity gov.noaa.nmfs.inport:25327 Angie Greig 2015-06-11T11:38:35 SysAdmin InPortAdmin 2026-03-04T19:17:18 2016-04-28 Alaska Fisheries Science Center AFSC 7600 Sand Point Way N.E., Building 4 Seattle WA 98115 USA https://www.afsc.noaa.gov 0700-1700 Pacific Time 1001 Public No No 2016-04-28 1 Year 2017-04-28 none groundfish Kingdom Animalia Genus Gadus Species macrocephalus Pacific cod Genus Sebastes Species polyspinis northern rockfish