AFSC/REFM: Isolation by distance (IBD) Alaskan fish stock structure modeling (NCEI Accession 0130929)

Metadata Updated: March 10, 2021

This model study examines several management strategies for two marine fish species subject to isolation-by-distance (IBD): 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.

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Dates

Metadata Created Date March 10, 2021
Metadata Updated Date March 10, 2021
Data Update Frequency irregular

Metadata Source

Harvested from Commerce Non Spatial Data.json Harvest Source

Additional Metadata

Resource Type Dataset
Metadata Created Date March 10, 2021
Metadata Updated Date March 10, 2021
Publisher DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce (Point of Contact)
Unique Identifier Unknown
Maintainer
Identifier gov.noaa.nodc:0130929
Language en-US
Data Last Modified 2015-08-21
Public Access Level public
Data Update Frequency irregular
Bureau Code 006:48
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Old Spatial {"type": "Polygon", "coordinates": 170.0, 50.0, -160.0, 50.0, -160.0, 62.0, 170.0, 62.0, 170.0, 50.0}
Program Code 006:059
Source Datajson Identifier True
Source Hash 80785b1482fc210d68f17797df389740ba8917b1
Source Schema Version 1.1
Spatial {"type": "Polygon", "coordinates": 170.0, 50.0, -160.0, 50.0, -160.0, 62.0, 170.0, 62.0, 170.0, 50.0}
Temporal 1980-01-01T00:00:00/2012-01-01T00:00:00

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