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

Metadata Updated: January 17, 2017

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.

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Metadata Date July 20, 2016
Metadata Created Date October 3, 2016
Metadata Updated Date January 17, 2017
Reference Date(s) March 10, 2016 (publication)
Frequency Of Update notPlanned

Metadata Source

Harvested from NOAA CSW Harvest Source

Additional Metadata

Resource Type Dataset
Metadata Date July 20, 2016
Metadata Created Date October 3, 2016
Metadata Updated Date January 17, 2017
Reference Date(s) March 10, 2016 (publication)
Responsible Party National Oceanic and Atmospheric Administration (NOAA) Alaska Fisheries Science Center (AFSC) Resource Ecology and Fisheries Management Division (REFM) (Point of Contact)
Contact Email
Access Constraints 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.
Bbox East Long -160.0
Bbox North Lat 62.0
Bbox South Lat 50.0
Bbox West Long 170.0
Coupled Resource
Frequency Of Update notPlanned
Guid gov.noaa.nmfs.inport:25327
Harvest Object Id 6a227e6d-d685-4956-bacf-2fee1ba8cd72
Harvest Source Id 2aed8e29-fc5b-4cde-aa66-fb1118fd705e
Harvest Source Title NOAA CSW Harvest Source
Metadata Language
Metadata Type geospatial
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 2015-01-01
Temporal Extent End 2015-01-01

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