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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

    • KASTELLE, C. R., T. E. HELSER, J. L. MCKAY, C. G. JOHNSTON, D. M. ANDERL, M. E. MATTA, and D. G. NICHOL. 2017. Age validation of Pacific cod (Gadus macrocephalus) using high-resolution stable oxygen isotope (δ18O) chronologies in otoliths. Fish. Res. 185:43-53. http://dx.doi.org/10.1016/j.fishres.2016.09.024   Online.
       
    • SOMERTON, D. A., R. A. McCONNAUGHEY, and S. S. INTELMANN. 2017. Evaluating the use of acoustic bottom typing to inform models of bottom trawl sampling efficiency. Fish. Res. 185:14-16. http://dx.doi.org/10.1016/j.fishres.2016.09.029  Online.
       
    • COOPER, D. W., and D. G. NICHOL. 2016. Juvenile northern rock sole (Lepidopsetta polyxystra) spatial distribution and abundance patterns in the eastern Bering Sea: spatially dependent production linked to temperature. ICES Journal of Marine Science http://dx.doi.org/73:1138-1146. 10.1093/icesjms/fsw005   Online.
       
    • STEVENSON, D. E., and R. R. LAUTH. 2012. Latitudinal trends and temporal shifts in the catch composition of bottom trawls conducted on the eastern Bering Sea shelf. Deep-Sea Res. II 6570:251-259. http://dx.doi.org/10.1016/j.dsr2.2012.02.021   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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