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Groundfish Assessment Program

Bottom Trawl Surveys

Scenic photo of island in Alaska

The AFSC Groundfish Assessment Program (GAP) regularly conducts bottom trawl surveys to assess the condition of groundfish and shellfish stocks in Alaskan marine waters.

The surveys range from southeastern Alaska north to the Eastern Bering Sea shelf and slope and to the westernmost Aleutian Islands.

Bottom trawl surveys for groundfish and king and Tanner crabs occur annually in the eastern Bering Sea in cooperation with the AFSC Shellfish Assessment Program. Biennial bottom trawl surveys are conducted in the Aleutian Islands (even years), Gulf of Alaska (odd years), and along the eastern Bering Sea slope (even years).

Beginning in 2017, biennial surveys will occur in the Northern Bering Sea. Bottom trawl surveys are occasionally conducted in the Chukchi and Beaufort Seas. AFSC's Auke Bay Laboratory also conducts longline surveys of sablefish abundance are conducted throughout Alaskan waters.


  • Results of the 2013 Eastern Bering Sea Continental Shelf Bottom Trawl Survey Go there >>
  • Data Report: 2015 Gulf of Alaska Bottom Trawl Survey Go there >>
  • Data report: 2012 Aleutian Islands bottom trawl survey Go there >>
  • Results of the 2012 Eastern Bering Sea Upper Continental Slope Survey 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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