AFSC/REFM: Isolation by distance (IBD) Alaskan fish stock structure modeling

Description

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.

Resources

Name Format Description Link
0 AKFSC Home Page https://www.fisheries.noaa.gov/about/alaska-fisheries-science-center
33 NOAA Data Management Plan for this record on InPort. https://www.fisheries.noaa.gov/inportserve/waf/noaa/nmfs/afsc/dmp/pdf/25327.pdf
0 http://accession.nodc.noaa.gov/0130929
0 View the complete metadata record on InPort for more information about this dataset. https://www.fisheries.noaa.gov/inport/item/25327
40 Download link (6kb) http://accession.nodc.noaa.gov/0130929/data/0-data/Spies_metadata_file_descriptions.rtf
0 http://accession.nodc.noaa.gov/0130929
0 View the complete metadata record on InPort for more information about this dataset. https://www.fisheries.noaa.gov/inport/item/25327
0 AKFSC Home Page https://www.fisheries.noaa.gov/about/alaska-fisheries-science-center
40 Download link (6kb) http://accession.nodc.noaa.gov/0130929/data/0-data/Spies_metadata_file_descriptions.rtf
0 Global Change Master Directory (GCMD). 2024. GCMD Keywords, Version 19. 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 https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
33 NOAA Data Management Plan for this record on InPort. https://www.fisheries.noaa.gov/inportserve/waf/noaa/nmfs/afsc/dmp/pdf/25327.pdf
0 The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords
0 https://accession.nodc.noaa.gov/0130929
0 View the complete metadata record on InPort for more information about this dataset. https://www.fisheries.noaa.gov/inport/item/25327
0 AKFSC Home Page https://www.fisheries.noaa.gov/about/alaska-fisheries-science-center
33 NOAA Data Management Plan for this record on InPort. https://www.fisheries.noaa.gov/inportserve/waf/noaa/nmfs/afsc/dmp/pdf/25327.pdf
40 Download link (6kb) https://accession.nodc.noaa.gov/0130929/data/0-data/Spies_metadata_file_descriptions.rtf
0 Global Change Master Directory (GCMD). 2024. GCMD Keywords, Version 19. 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 https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords

Tags

  • alaska fisheries science center
  • aleutian islands
  • isolation by distance stock structure
  • fisheries management
  • noaa
  • gadus macrocephalus
  • u.s. department of commerce
  • national marine fisheries service
  • doc/noaa/nmfs/afsc
  • spatial management
  • northern rockfish
  • sebastes polyspinis
  • modeled data
  • genetics
  • bering sea
  • pacific cod
  • groundfish

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