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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

    • CONRATH, C. L., and N. B. SISSON. 2018. Delayed discard mortality of the giant Pacific octopus, Enteroctopus dofleini, in the Gulf of Alaska cod pot fishery. Fish. Res. 197:10-14. https://doi.org/10.1016/j.fishres.2017.10.003   Online.
       
    • SOMERTON, D., K. WEINBERG, P. MUNRO, L. RUGOLO, and T. WILDERBUER. 2017. The effects of wave-induced vessel motion on the geometry of a bottom survey trawl and the herding of yellowfin sole (Limanda aspera). Fish Bull., U.S. 116:21-33.  Online.
       
    • BOLDT, J. L., K. WILLIAMS, C. N. ROOPER, R. H. TOWLER, and S. GAUTHIER. 2018. Development of stereo camera methodologies to improve pelagic fish biomass estimates and inform ecosystem management in marine waters. Fisheries Research 198:66-77. https://doi.org/10.1016/j.fishres.2017.10.013   Online.
       
    • von SZALAY, P.G., D.A. SOMERTON. 2017. A method for predicting trawlability in the Gulf of Alaska with the use of calibrated, split-beam, echosounder backscatter. Fish. Bull. 115: 496-503 http://dx.doi.org/10.7755/FB.115.4.6   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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