Northwest Fisheries Science Center

Groundfish Ecology Teams

Staff

Staff Directory


U.S. West Coast Groundfish Bottom Trawl Survey

The Fisheries Research Survey team conducts the West Coast Groundfish Bottom Trawl Survey from May to October each year. This annual survey is conducted at depths from 55 meters to 1280 meters from the area off Cape Flattery, Washington (U.S.-Canada border) south to the U.S.-Mexico border. The goal of the survey is to ensure the sustainability of marine fisheries with a focus on ending overfishing. The groundfish fishery includes about 90 commercially fished stocks off Washington, Oregon, and California. The survey provides data on abundance, spatial distributions, sex, length, maturity, weight, and age structure of groundfish in trawlable habitats.

The survey is a key source of fishery-independent data that is necessary for stock assessments of managed groundfish species inhabiting trawlable habitat along the upper continental slope and shelf on the U.S. West Coast. The time series of survey estimates are used in age-structured assessment models for important management species. All survey operations are conducted within strict compliance with NOAA protocols for bottom trawl surveys. Catch and related information are quality checked at sea. The survey area is covered twice each year using chartered commercial fishing vessels (20 to 28 m length). This survey contributes to assessment models for multiple groundfish species providing data vital for the ongoing management of important West Coast fisheries resources.

Location

U.S. — Canada border to U.S. — Mexico border

Research Theme

Recovery, Rebuilding, and Sustainability of Marine Species

Research Partners

West Coast commercial fishermen, Oregon State University, Moss Landings Marine Research Laboratory, University of Wasington.

Scientific Personnel

Keith Bosley: NOAA, NWFSC
John Buchanan: NOAA, NWFSC
Aaron Chappell: NOAA, NWFSC
Doug Draper: NOAA, NWFSC
Peter Frey: NOAA, NWFSC
Melissa Head: NOAA, NWFSC
John Harms: NOAA, NWFSC
Dan Kamikawa: NOAA, NWFSC
Aimee Keller: NOAA, NWFSC
Victor Simon: NOAA, NWFSC

Publications

Frey, P. H., A. A. Keller, V. Simon. 2017. Dynamic population trends observed in the deep-living Pacific flatnose, Antimora microlepis, on the U.S. West Coast. Deep Sea Research Part I: Oceanographic Research. Deep-Sea Research, I. 122: 105-112.

Keller, A. A., L. Ciannelli, W. W. Wakefield, V. H. Simon, J. A. Barth, S. D. Pierce. 2017. Species-specific responses of demersal fishes to near-bottom oxygen levels within the California Current large marine ecosystem. Marine Ecology Progress Series, (568)151-173. doi:https://doi.org/10.3354/meps12066

Everett, M. V., L. K. Park, E. A. Berntson, A. Elz, C. Whitmire, A. A. Keller, M. E. Clarke. 2016. Large-scale genotyping-by-sequencing indicates high levels of gene flow in the deep-sea octocoral Swiftia simplex (Nutting 1909) on the west coast of the United States. PLoS ONE. 11(10): e0165279. doi:10.1371/journal.pone.0165279

Head, M. A., G. L. Stokes, J. T. Thorson, A. A. Keller. 2016. Techniques for improving estimates of maturity ogives in groundfish using double-reads and measurement error models. Fisheries Research, 179: 251-258.

Keller, A., J. C. Buchanan, E. Steiner, D. Draper, A. Chappell, P. H. Frey, M. A. Head. 2016. Size at maturity for grooved Tanner crab (Chionoecetes tanneri) along the U.S. west coast (Washington to California). Fisheries Oceanography, 25(3):292-305. doi:doi:10.1111/fog.12155

Drazen, J. C., J. R. Friedman, N. E. Condon, E. J. Aus, M. E. Gerringer, A. A. Keller, M. E. Clarke. 2015. Enzyme activities of demersal fishes from the shelf to the abyssal plain. Deep Sea Research Part I: Oceanographic Research. Deep-Sea Research I. 100:117–126.

Frey, P. H., M. A. Head, A. Keller. 2015. Maturity and growth of darkblotched rockfish, Sebastes crameri, along the U.S. west coast. Environmental Biology of Fishes, 98:2353-2365

Keller, A., L. Ciannelli, W. W. Wakefield, V. Simon, J. A. Barth, S. D. Pierce. 2015. Occurrence of demersal fishes in relation to near-bottom oxygen levels within the California current large marine ecosystem. Fisheries Oceanography, 24(2):162-176. doi:10.1111/fog.12100

Bradburn, J.M. and A.A. Keller. 2015. The effect of light on the catch rate of four species from the Northwest Fisheries Science Center’s west coast groundfish bottom trawl survey (2009 – 2010). Fish. Res. 164:193-200.

Thorson, J.T., Skaug, H., Kristensen, K., Shelton, O., Ward, E.J., Harms, J., and Benante, J. 2015. The importance of spatial models for estimating the type and strength of density dependence. Ecology. 96: 1202–1212.

Bosley, K. L., T. W. Miller, R. D. Brodeur, K. M. Bosley, A. L. Van Gaest, A. Elz. 2014. Feeding ecology of juvenile rockfishes off Oregon and Washington based on stomach content and stable isotope analyses. Marine Biology, 161(10):2381-2393

Brodeur, R. D., J. C. Buchanan, R. L. Emmett. 2014. Pelagic and demersal fish predators on juvenile and adult forage fishes in the California Current: spatial and temporal variations. California Cooperative Oceanic Fisheries Investigations Reports, 55: 96–116.

Bryan, D.R., K.L. Bosley, A.C. Hicks, M.A. Haltuch, W.W. Wakefield. 2014. Quantitative video analysis of flatfish herding behavior and impact on effective area swept of a survey trawl. Fisheries Research, Volume 154(June 2014):120-126. doi:http://dx.doi.org/10.1016/j.fishres.2014.02.007

Ebert, D.A., Knuckey, J. and D. Kamikawa. 2014. First eastern North Pacific record of the velvet dogfish, Zameus squamulosus (Chondrichthyes: Squaliformes: Somniosidae). Marine Biodiversity Records, 7: e48, 1-3. doi: 10.1017/S1755267214000499.

Head, M.A., A.A. Keller, M.J. Bradburn. 2014. Maturity and growth of sablefish, Anoplopoma fimbria, along the U.S. West Coast. Fisheries Research, 159: 56-67. DOI: 10.1016/j.fishres.2014.05.007

Hess, J.E., Chittaro, P., Elz, A., Gilbert-Horvath, E.A., Simon, V.H. and Garza, J.C. 2014. Cryptic population structure near Point Conception, CA in the severely depleted cowcod, Sebastes levi. Can. J. Fish. Aquat. Sci. 71: 81-92.

Hicks, A.C., Wetzel, C. and J. Harms. 2014. The status of rougheye rockfish (Sebastes aleutianus) and blackspotted rockfish (S. melanostictus) as a complex along the U.S. West Coast in 2013. Stock Assessment and Fishery Evaluation. Pacific Fishery Management Council, Portland, OR. http://www.pcouncil.org/wp-content/uploads/Darkblotched_2013_Assessment.pdf

Keller, A.A., Wakefield, W.W., Whitmire, C.E., Horness, B.H., Bellman, M.A. and K.L. Bosley. 2014. Distribution of demersal fishes along the U.S. west coast (Canada to Mexico) in relation to the spatial fishing closures (2003 – 2011). Mar. Ecol. Prog. Ser. 501:169-190.

Miller, T.W., Bosley, K.L., Shibata, J., Brodeur, R.D., Omori, K. and R. Emmett. 2014. Use of mixing models for Humboldt squid diet analysis: Reply to Field et al. (2014). Mar. Ecol. Prog. Ser. 500: 287-290.

Keller, A. A., M. J. Bradburn, V. H. Simon. 2013. Shifts in condition and distribution of eastern North Pacific flatfish along the U.S. west coast (2003 – 2010). Deep-Sea Res. I, 77: 23-35.

Bryan, D., Jacobson, K.C., Buchanan, J. 2012. Recent increase in Nybelinia surmenicola prevalence and intensity in Pacific hake (Merluccius productus) off the United States west coast. J. Parasitol. 98: 85-92.

Keller, A. A., J. Harms, J. C. Buchanan. 2012. Distribution, biomass and size of grooved Tanner crabs (Chionoecetes tanneri) from annual bottom trawl surveys (2003-2010) along the U.S. west coast (Washington to California). Deep Sea Research Part I: Oceanographic Research, 67: 44-54.

Keller, A. A., K. J. Molton, A. C. Hicks, M. A. Haltuch, C. R. Wetzel. 2012. Variation in age and growth of greenstriped rockfish (Sebastes elongatus) along the U.S. West Coast (Washington to California). Fisheries Research 107:80-88.

Keller, A.A., J.R. Wallace, B.H. Horness, O.S. Hamel, I. J. Stewart. 2012. Variations in Eastern North Pacific demersal fish biomass based on The U.S. West Coast groundfish bottom trawl survey (2003-2010). Fishery Bulletin, 110:63-80.

Chittaro, P.M., I.C. Kaplan, A.A. Keller, P.S. Levin. 2010. Trade-offs between species conservation and the size of marine protected areas. Conservation Biology, 24(1):197-206. doi:10.1111/j.1523-1739.2009.01323.x

Fruh, E.L., A.A. Keller, J. Trantham, V. Simon. 2010. Accuracy of Sex Determination for northeastern Pacific Ocean thornyheads (Sebastolobus altivelis and S. alascanus). Fishery Bulletin, 108:226-232.

Kamikawa, D. J., J. Stevenson. 2010. Aldrovandia oleosa (Notacanthiformes: Halosauridae): New records from the Eastern North Pacific Ocean. California Fish and Game Scientific Journal, 96: 216-220.

Keller, A.A., E.L. Fruh, M. Johnson, V. H. Simon, C. McGourty. 2010. Distribution and abundance of anthropogenic marine debris along the shelf and slope of the U.S. West Coast. Mar. Pollut. Bull. 60: 672-700.

Keller, A.A., V.H. Simon, F. Chan, W.W. Wakefield, M.E. Clarke, J.A. Barth, D.J. Kamikawa, E.L. Fruh. 2010. Demersal fish and invertebrate biomass in relation to an offshore hypoxic zone along the U.S. West Coast. Fisheries Oceanography, 19:76-87. doi:doi:10.1111/j.1365-2419.2009.00529.x

Stewart, I.J., A.A. Keller, E.L. Fruh, V.H. Simon, B.H. Horness. 2010. Throwing in the towel: When do adverse conditions dictate a weather day during a bottom trawl survey? Fisheries Research, 102(1-2):130-140.

Harvey, C.J., K. Gross, V.H. Simon, J. Hastie. 2008. Trophic and fishery interactions between Pacific hake and rockfish: effect on rockfish population rebuilding times. Marine Ecology Progress Series, 365:165-176.

Bosley, K. L., J. W. Lavelle, R. D. Brodeur, W. W. Wakefield, R. L. Emmett, E. T. Baker, K. M. Rehmke. 2004. Biological and physical processes in and around Astoria submarine canyon, Oregon, U.S.A. Journal of Marine Systems, 50:21-37.

Keller, A.A., J.R. Wallace, R.D. Methot. 2017. The Northwest Fisheries Science Center's West Coast Groundfish Bottom Trawl Survey: History, Design, and Description. .S. Dept. Commer, NOAA Tech. Memo. NMFS-NWFSC-136. 38 pp.

Bradburn, M. J., A. A. Keller, B. H. Horness. 2011. The 2003 to 2008 U.S. West Coast bottom trawl surveys of groundfish resources off Washington, Oregon, and California: estimates of distribution, abundance, length and age composition. U.S. Dept. Commer, NOAA Tech. Memo. NMFS-NWFSC-114. 323 pp.

Keller, A. A., B. H. Horness, E. L. Fruh, V. H. Simon, V. J. Tuttle, K. L. Bosley, J. C. Buchanan, D. J. Kamikawa, J. R. Wallace. 2008. The 2005 U.S. West Coast bottom trawl survey of groundfish resources off Washington, Oregon, and California: Estimates of distribution, abundance, and length composition. U.S. Dept. of Commerce, NOAA Tech. Memo., NMFS-NWFSC-93, 136 p. (link not found)

Keller, A. A., B. H. Horness, V. H. Simon, V. J. Tuttle, J. R. Wallace, E. L. Fruh, K. L. Bosley, D. J. Kamikawa, J. C. Buchanan. 2007. The 2004 U.S. West Coast bottom trawl survey of groundfish resources off Washington, Oregon, and California: Estimates of distribution, abundance, and length composition. U.S. Dept. of Commerce, NOAA Tech. Memo., NMFS-NWFSC-87, 134 p.

Keller, A. A., V. H. Simon, B. H. Horness, J. R. Wallace, V. J. Tuttle, E. L. Fruh, K. L. Bosley, D. J. Kamikawa, J. C. Buchanan. 2007. The 2003 U.S. West Coast bottom trawl survey of groundfish resources off Washington, Oregon, and California: Estimates of distribution, abundance, and length composition. U.S. Dept. of Commerce, NOAA Tech. Memo., NMFS-NWFSC-86, 130 p.

Ramsey, T. B., T. A. Turk, E. L. Fruh, J. R. Wallace, B. H. Horness, A. J. Cook, K. L. Bosley, D. J. Kamikawa, L. C. Hufnagle Jr., K. Piner. 2002. The 1999 Northwest Fisheries Science Center Pacific West Coast upper continental slope trawl survey of groundfish resources off Washington, Oregon, and California. U.S. Dept. of Commerce, NOAA Tech. Memo., NMFS-NWFSC-55, 143 p

Turk, T. A., T. L. Builder, C. W. West, D. J. Kamikawa, J. R. Wallace, R. D. Methot, A. R. Bailey, K. L. Bosley, A. J. Cook, E. L. Fruh, B. H. Horness, K. Piner, H. R. Sanborn, W. W. Wakefield. 2001. The 1998 Northwest Fisheries Science Center Pacific West Coast Upper Continental Slope Trawl Survey of Groundfish Resources off Washington, Oregon, and California: Estimates of Distribution, Abundance, and Length Composition. U.S. Dept. of Commerce, NOAA Tech. Memo., NMFS-NWFSC-50, 122