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Assessment of the Thornyhead stock complex in the Gulf of Alaska
Filetype[PDF-3.36 MB]


Details:
  • Personal Author:
  • Corporate Authors:
    North Pacific Fishery Management Council. Plan Team for the Groundfish Fisheries of the Gulf of Alaska
  • Description:
    Rockfish have historically been assessed on a biennial stock assessment schedule to coincide with the availability of new trawl survey data (odd years). In 2017, the Alaska Fisheries Science Center (AFSC) participated in a stock assessment prioritization process. It was recommended that the Gulf of Alaska (GOA) thornyhead complex remain on a biennial stock assessment schedule with a full stock assessment produced in even years and no stock assessment produced in odd years. However, we performed a partial stock assessment in 2017 because the allowable biological catch (ABC) has been exceeded in the past in the western GOA, and because the biomass estimates provided by the GOA trawl surveys have at times displayed extreme variability between surveys. We followed the recommendation of the Science and Statistical Committee (SSC) and the GOA Groundfish Plan Team that “partial assessments for Tiers 4-5 should be an expanded version of the current off-year executive summaries, including catch/biomass ratios for all species in addition to re-running the random effects model” (SSC minutes – February 2017). For this on-cycle year, we incorporate Relative Population Weights (RPWs) from the 1992-2018 longline surveys, and update auxiliary data sources. This stock is classified as a Tier 5 stock. We continue to use a random effects (RE) model fit to survey data to estimate exploitable biomass and determine the recommended ABC, but we present a new method of combining the AFSC longline survey Relative Population Weight (RPW) index (1992-2018) with the AFSC bottom trawl survey biomass index (1984–2017) within the random effects model. The RE model was fit to the time series of trawl survey biomass values and estimates of uncertainty by region and depth strata and regional RPW indices from the AFSC longline survey (with associated estimates of uncertainty). These regional biomass estimates from the RE model were then summed to obtain Gulfwide biomass.
  • Keywords:
  • Document Type:
    Stock Assessment
  • Place as Subject:
  • Collection(s):
    National Marine Fisheries Service (NMFS)
  • Main Document Checksum:
  • Supporting Files:
    No Additional Files
    1. Assessment of the Sculpin stock complex in the Gulf of Alaska
      Personal Author:
      Spies, Ingrid; Nichol, Dan; Aydin, Kerim; TenBrink, Todd T.;
      Corporate Authors:
      North Pacific Fishery Management Council. Plan Team for the Groundfish Fisheries of the Gulf of Alaska
      Published Date:
      2018
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      [NOTE: In accordance with the approved assessment schedule, no stock assessment was conducted for this stock this year, however, a full stock assessment will be conducted in 2021. Until then, the values generated from the previous stock assessment (b...
      File Type:
      Filetype[PDF - 179.98 KB]
    2. Assessment of the Pacific ocean perch stock in the Gulf of Alaska
      Personal Author:
      Hulson, Peter-John F.; Hanselman, Dana H.; Lunsford, Chris R.; Fissel, Ben;
      Corporate Authors:
      North Pacific Fishery Management Council. Plan Team for the Groundfish Fisheries of the Gulf of Alaska
      Published Date:
      2018
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      Rockfish are assessed on a biennial stock assessment schedule to coincide with the availability of new survey data. For Gulf of Alaska rockfish in alternate (even) years we present an executive summary to recommend harvest levels for the next two yea...
      File Type:
      Filetype[PDF - 344.53 KB]
    3. Ecosystem Status Report 2018: Gulf of Alaska
      Corporate Authors:
      North Pacific Fishery Management Council. Plan Team for the Groundfish Fisheries of the Gulf of Alaska
      Published Date:
      2018
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      The goals of the Ecosystem Status Reports are to: (1) provide stronger links between ecosystem research and fishery management and (2) spur new understanding of the connections between ecosystem components by bringing together the results of diverse ...
      File Type:
      Filetype[PDF - 5.24 MB]
    4. Assessment of the Dusky Rockfish stock in the Gulf of Alaska
      Personal Author:
      Fenske, Kari H.; Hulson, Peter-John F.; Lunsford, Chris R.; Shotwell, S. Kalei; Hanselman, Dana H.;
      Corporate Authors:
      North Pacific Fishery Management Council. Plan Team for the Groundfish Fisheries of the Gulf of Alaska
      Published Date:
      2018
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      In 2017, the scheduled frequency for some stock assessments was changed in response to the National Stock Assessment Prioritization effort (Methot 2015, Hollowed et al. 2016). Prior to 2017, Gulf of Alaska (GOA) rockfish were assessed on a biennial s...
      File Type:
      Filetype[PDF - 2.83 MB]
    5. Assessment of the shark stock complex in the Gulf of Alaska
      Personal Author:
      Tribuzio, Cindy A.; Rodgveller, Cara; Echave, Katy; Hulson, Peter-John;
      Corporate Authors:
      North Pacific Fishery Management Council. Plan Team for the Groundfish Fisheries of the Gulf of Alaska
      Published Date:
      2018
      Series:
      Gulf of Alaska Stock Assessments
      File Type:
      Filetype[PDF - 6.39 MB]
    6. Status of forage species in the Gulf of Alaska region
      Personal Author:
      Ormseth, Olav A.
      Corporate Authors:
      North Pacific Fishery Management Council. Plan Team for the Groundfish Fisheries of the Gulf of Alaska
      Published Date:
      2018
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      A report on the status of forage species in the Gulf of Alaska (GOA) region is prepared on a biennial basis and presented to the GOA Plan Team and the North Pacific Fishery Management Council (NPFMC) in even years. This report is not intended as a fo...
      File Type:
      Filetype[PDF - 1.42 MB]
    7. Assessment of the arrowtooth flounder stock in the Gulf of Alaska
      Personal Author:
      Spies, Ingrid; Palsson, Wayne;
      Corporate Authors:
      North Pacific Fishery Management Council. Plan Team for the Groundfish Fisheries of the Gulf of Alaska
      Published Date:
      2018
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      The Gulf of Alaska (GOA) arrowtooth flounder (ATF, Atheresthes stomias) stock is managed in Tier 3a and is assessed on a biennial basis to coincide with the GOA groundfish trawl survey. These surveys occur in odd years, and for these years a full ass...
      File Type:
      Filetype[PDF - 285.84 KB]
    8. Assessment of the Rougheye and Blackspotted rockfish stock complex in the Gulf of Alaska
      Personal Author:
      Shotwell, S. Kalei; Hanselman, Dana H.; Heifetz, Jonathan;
      Corporate Authors:
      North Pacific Fishery Management Council. Plan Team for the Groundfish Fisheries of the Gulf of Alaska
      Published Date:
      2018
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      The scheduled frequency for some stock assessments was recently changed in response to the National Stock Assessment Prioritization effort (Methot 2015; Hollowed et al. 2016). In previous years, all Gulf of Alaska (GOA) rockfish stocks were assessed ...
      File Type:
      Filetype[PDF - 766.12 KB]
    9. Assessment of the Other Rockfish stock complex in the Gulf of Alaska
      Personal Author:
      Tribuzio, Cindy A.; Coutré, Karson; Echave, Katy B.;
      Corporate Authors:
      North Pacific Fishery Management Council. Plan Team for the Groundfish Fisheries of the Gulf of Alaska
      Published Date:
      2018
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      [NOTE: In accordance with the approved assessment schedule, no stock assessment was conducted for this stock this year, however, a full stock assessment will be conducted in 2019. Until then, the values generated from the previous stock assessment (b...
      File Type:
      Filetype[PDF - 260.63 KB]
    10. Assessment of the skate stock complex in the Gulf of Alaska
      Personal Author:
      Ormseth, Olav A.
      Corporate Authors:
      North Pacific Fishery Management Council. Plan Team for the Groundfish Fisheries of the Gulf of Alaska
      Published Date:
      2018
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      [NOTE: In accordance with the approved assessment schedule, no stock assessment was conducted for this stock this year, however, a full stock assessment will be conducted in 2019. Until then, the values generated from the previous stock assessment (b...
      File Type:
      Filetype[PDF - 351.62 KB]
    11. Assessment of the Deepwater Flatfish Stock Complex in the Gulf of Alaska
      Personal Author:
      McGilliard, Carey R.; Palsson, Wayne;
      Corporate Authors:
      North Pacific Fishery Management Council. Plan Team for the Groundfish Fisheries of the Gulf of Alaska
      Published Date:
      2018
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      The Gulf of Alaska deepwater flatfish complex (consisting of Dover sole, Greenland turbot, and deepsea sole) is assessed every four years and was last assessed in 2015. In years without an assessment, we present an executive summary to recommend harv...
      File Type:
      Filetype[PDF - 930.31 KB]
    12. Assessment of the Pacific cod stock in the Gulf of Alaska
      Personal Author:
      Barbeaux, Steven; Aydin, Kerim; Fissel, Ben; Holsman, Kirstin; Laurel, Ben; Palsson, Wayne; Shotwell, Kalei; Yang, Qiong; Zador, Stephani;
      Corporate Authors:
      North Pacific Fishery Management Council. Plan Team for the Groundfish Fisheries of the Gulf of Alaska
      Published Date:
      2018
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      Relative to last year’s assessment, the following changes have been made in the current assessment: Changes in the input data-- 1.Federal and state catch data for 2017 were updated and preliminary federal and state catch data for 2018 were included...
      File Type:
      Filetype[PDF - 14.26 MB]
    13. Assessment of the Shallow-water Flatfish Stock Complex in the Gulf of Alaska
      Personal Author:
      Bryan, Meaghan; Turnock, Benjamin J.; Wilderbuer, Thomas K.;
      Corporate Authors:
      North Pacific Fishery Management Council. Plan Team for the Groundfish Fisheries of the Gulf of Alaska
      Published Date:
      2018
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      The shallow-water flatfish stock complex in the Gulf of Alaska (GOA) includes Alaska plaice (Pleuronectes quadrituberculatus), butter sole (Pleuronectes isolepis), English sole (Parophrys vetulus), sand sole (Psettichthys melanostictus), starry sole,...
      File Type:
      Filetype[PDF - 314.09 KB]
    14. Assessment of the Sablefish stock in Alaska
      Personal Author:
      Hanselman, Dana H.; Rodgveller, Cara J.; Fenske, Kari H.; Shotwell, S. Kalei; Echave, Katy B.; Malecha, Patrick W.; Lunsford, Chris R.;
      Corporate Authors:
      North Pacific Fishery Management Council. Plan Team for the Groundfish Fisheries of the Gulf of Alaska
      Published Date:
      2018
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      The longline survey abundance index increased 9 % from 2017 to 2018 following a 14% increase in 2017 from 2016. The lowest point of the time series was 2015. The fishery catch-rate/abundance index stayed level from 2016 to 2017 and is at the time ser...
      File Type:
      Filetype[PDF - 20.36 MB]
    15. Assessment of the Demersal Shelf Rockfish stock complex in the Southeast Outside Subdistrict of the Gulf of Alaska
      Personal Author:
      Olson, Andrew; Williams, Ben; Jaenicke, Mike;
      Corporate Authors:
      North Pacific Fishery Management Council. Plan Team for the Groundfish Fisheries of the Gulf of Alaska
      Published Date:
      2018
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      The demersal shelf rockfish (DSR) complex (yelloweye, quillback, copper, rosethorn, China, canary, and tiger rockfish) is assessed on a triennial cycle, with a full stock assessment typically conducted every third year. Historically, the stock assess...
      File Type:
      Filetype[PDF - 5.31 MB]
    16. Assessment of the Octopus Stock Complex in the Gulf of Alaska
      Personal Author:
      Ormseth, Olav A.; Conners, M. Elizabeth;
      Corporate Authors:
      North Pacific Fishery Management Council. Plan Team for the Groundfish Fisheries of the Gulf of Alaska
      Published Date:
      2018
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      [NOTE: In accordance with the approved assessment schedule, no stock assessment was conducted for this stock this year, however, a full stock assessment will be conducted in 2019. Until then, the values generated from the previous stock assessment (b...
      File Type:
      Filetype[PDF - 187.24 KB]
    17. Assessment of the Atka mackerel stock in the Gulf of Alaska
      Personal Author:
      Lowe, Sandra A.
      Corporate Authors:
      North Pacific Fishery Management Council. Plan Team for the Groundfish Fisheries of the Gulf of Alaska
      Published Date:
      2018
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      [NOTE: In accordance with the approved assessment schedule, no stock assessment was conducted for this stock this year, however, a full stock assessment will be conducted in 2019. Until then, the values generated from the previous stock assessment (b...
      File Type:
      Filetype[PDF - 159.49 KB]
    18. Assessment of the Northern Rockfish stock in the Gulf of Alaska
      Personal Author:
      Cunningham, Curry J.; Hulson, Peter-John F.; Lunsford, Chris R.; Hanselman, Dana H.;
      Corporate Authors:
      North Pacific Fishery Management Council. Plan Team for the Groundfish Fisheries of the Gulf of Alaska
      Published Date:
      2018
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      Gulf of Alaska (GOA) rockfish are assessed on a biennial stock assessment schedule. In 2017, the scheduled frequency for some stock assessments was changed in response to the National Stock Assessment Prioritization effort. Prior to 2017, Gulf of Ala...
      File Type:
      Filetype[PDF - 8.16 MB]
    19. Assessment of the Flathead Sole Stock Complex in the Gulf of Alaska
      Personal Author:
      McGilliard, Carey R.; Turnock, Benjamin J.; Palsson, Wayne;
      Corporate Authors:
      North Pacific Fishery Management Council. Plan Team for the Groundfish Fisheries of the Gulf of Alaska
      Published Date:
      2018
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      The Gulf of Alaska flathead sole stock is assessed every four years and was last assessed in 2017. In years without a full assessment, we present an executive summary to recommend harvest levels for the next twoyears. Please refer to the 2017 full st...
      File Type:
      Filetype[PDF - 475.94 KB]
    20. Assessment of the Rex Sole Stock in the Gulf of Alaska
      Personal Author:
      McGilliard, Carey R.; Palsson, Wayne;
      Corporate Authors:
      North Pacific Fishery Management Council. Plan Team for the Groundfish Fisheries of the Gulf of Alaska
      Published Date:
      2018
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      The Gulf of Alaska rex sole stock is assessed every four years and was last assessed in 2017. In between the full assessment years, we present an executive summary to recommend harvest levels for the next two years. Please refer to the 2017 full stoc...
      File Type:
      Filetype[PDF - 548.30 KB]
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