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Groundfish Assessment Program

Research

Photo of a trawl net in the water
Photo of a basket of fish and invertebrates

The AFSC Groundfish Assessment Program (GAP), in addition to regularly conducting bottom trawl surveys, also investigates biological processes and interactions with the environment to estimate growth, mortality, and recruitment to improve the precision and accuracy of forecasting stock dynamics.
Impacts of bottom trawls on the seafloor and the description of bottom type are also being studied in the Bering Sea and Aleutian Islands.





  • Alaska Bathymetry, Sediments, and Smooth Sheets Go there >>
  • Validating and improving species distribution models for structure forming invertebrates using an independent survey in the eastern Bering Sea. Go there >>
  • Is the survey selectivity curve for Pacific cod (Gadus macrocephalus) dome-shaped? Direct evidence from trawl studies. Go there >>


  • Recent Poster Presentations, Publications, Reports & Activities

    • PIETSCH, T. W., and J. W. ORR. 2019. Obituary. Jean Richard Dunn (19342017). Copeia 107:379381. https://doi.org/10.1643/OT-19-203  Online.
       
    • ORR, J. W., D. E. STEVENSON, G. HANKE, I. B. SPIES, JAMES A. BOUTILLIER, and G. R HOFF. 2019. Range extensions and new records from Alaska and British Columbia for two skates, Bathyraja spinosissima and B. microtrachys. Northwest. Nat. 100:3747. https://doi.org/10.1898/NWN18-21  Online.
       
    • LAUTH, R. R., E. J. DAWSON, and J. CONNER. 2019. Results of the 2017 eastern and northern Bering Sea continental shelf bottom trawl survey of groundfish and invertebrate fauna. U.S. Dep. Commer., NOAA Tech. Memo. NMFS-AFSC-396, 260 p.   Online.
       
    • ROOPER, C. N., G. R. HOFF, D. E. STEVENSON, J. W. ORR, and I. B. SPIES. 2019. Skate egg nursery habitat in the eastern Bering Sea: a predictive model. Mar. Ecol. Prog. Ser. 609:163178. https://doi.org/10.3354/meps12809  Online.
       
    • Using Triggered Cameras to Determine Fish Behavior in Rocky, Untrawlable Areas
      By:  KRESIMIR WILLIAMS, CHRIS ROOPER, MIKE LEVINE, ALEX De ROBERTIS
      Conference:  Western Groundfish Conference (19th), Newport, OR, Feb 2016
      (2016 poster, .pdf, 468 KB)   Online.

       
    • Introducing the Working Group on Maturity Assessment and Reproductive Variability of Life Stages
      By:  SUSANNE McDERMOTT, SANDI NEIDETCHER, CHRISTINA CONRATH, PAUL SPENCER
      Conference:  Western Groundfish Conference (19th), Newport, OR, Feb 2016
      (2016 poster, .pdf, 1.85 MB)   Online.

       

    See the poster and publications databases for additional listings.

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