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Groundfish Assessment Program

The Groundfish Assessment Program is responsible for planning, executing, analyzing, and reporting results from surveys to establish time series estimates of the distribution and abundance of Alaska groundfish resources in the Gulf of Alaska, Bering Sea, and Aleutian Islands. The program 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.

The Groundfish Assessment Program in cooperation with the RACE Shellfish Assessment Program annually conducts a bottom trawl assessment survey for groundfish and king and Tanner crabs in the eastern Bering sea. This survey was initiated in 1971 and has been conducted annually since 1979. Annual surveys of sablefish abundance in the Bering Sea/Aleutian Islands region and Gulf of Alaska have been conducted since 1979 in cooperation with the AFSCs Auke Bay Laboratory. Major triennial surveys have been conducted for groundfish resources in the Aleutian Islands region, and in portions of the eastern Bering Sea not included in the annual groundfish/crab survey since 1977. Standard trawls and longlines have been used throughout these time series surveys. Special purpose surveys and studies have been conducted to improve understanding of biological processes, interaction with the environment, and factors affecting the precision and accuracy of estimates of abundance and population forecasts.

Data derived from Groundfish surveys are documented in scientific reports and are incorporated into stock assessment advice to the Pacific Fishery Management Council, the North Pacific Fishery Management Council, international fishery management organizations, the fishing industry, and the general public.


  • Smooth Sheet Bathymetry of Cook Inlet, Alaska Go there >>
  • Yes, Virginia, Walleye Pollock is Gadus chalcogrammus Go there >>
  • 2014 Groundfish ADP and Species Codebooks. Go there >>


  • Recent Poster Presentations, Publications, Reports & Activities

    • OKAMOTO, M., D. E. STEVENSON, and H. MOTOMURA. 2014. First record of Paracaristius maderensis from the central North Pacific and a second specimen of Platyberyx rhyton (Perciformes: Caristiidae). Biogeography 16:23-29. 
       
    • GODDARD, P., R. LAUTH, and C. ARMISTEAD. 2014. Results of the 2012 Chukchi Sea bottom trawl survey of bottomfishes, crabs, and other demersal macrofauna. U. S. Dep. Commer., NOAA-TM-AFSC-278, 110 p. (.pdf, 8.74 MB).  Online.
       
    • KOTWICKI, S., J. N. IANELLI, and A. E. PUNT. 2014. Correcting density-dependent effects in abundance estimates from bottom-trawl surveys. ICES J. Mar. Sci. 71:11071116. 
       
    • ORR, J. W., D. T. DRUMM, G. R. HOFF, and D. E. STEVENSON. 2014. Species identification confidence in the Bering Sea Slope surveys (1976-2010). AFSC Processed Rep. 2014-05, 71 p. Alaska Fish. Sci. Cent., NOAA, Natl. Mar. Fish. Serv., 7600 Sand Point Way NE, Seattle WA 98115. (.pdf, 754 KB).  Online.
       
    • Seasonal Habitat Use and Productivity of Commercially Important Rockfish in the Gulf Of Alaska
      By:  BRIAN A. KNOTH, CHRISTINA L. CONRATH, CHRIS ROOPER
      Conference:  ComFish Alaska 35th Annual Trade Show, Kodiak, AK, Apr 2014
      (2014 poster, .pdf, 459 KB)   Online.

       
    • Discard Mortality Studies for the Giant Pacific Octopus, Enteroctopus dofleini, in Alaska Waters
      By:  CHRISTINA L. CONRATH, M. ELIZABETH CONNERS, MICHAEL LEVINE
      Conference:  Alaska Marine Science Symposium, Anchorage, AK, Jan 2014
      (2014 poster, .pdf, 4.37 MB)   Online.

       

    See the poster and publications databases for additional listings.

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