Assessment of the shark stock complex in the Gulf of Alaska
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Assessment of the shark stock complex in the Gulf of Alaska
Filetype[PDF-64.25 KB]


Details:
  • Alternative Title:
    GOA Chapter 20
  • Personal Author:
  • Description:
    The shark complex (spiny dogfish, Pacific sleeper shark, salmon shark and other/unidentified sharks) in the Gulf of Alaska (GOA) is assessed on a biennial stock assessment schedule that coincides with the availability of new trawl survey biomass estimates. In alternate (even) years we present an executive summary to recommend harvest levels for the next two years. For detailed information regarding the assessment, please refer to the last full stock assessment, which is available online (Tribuzio et al. 2015, http://www.afsc.noaa.gov/REFM/Docs/2015/GOAshark.pdf). A full stock assessment document will be presented in next year’s SAFE report. The complex acceptable biological catch (ABC) and overfishing level (OFL) are based on the sum of the ABC and OFL calculations for the individual species. For an off-cycle year, there is no new survey information for the shark stock complex; therefore, the 2015 estimates are used in 2016 assessment.
  • Keywords:
  • Document Type:
    Stock Assessment
  • Place as Subject:
    Alaska, Gulf of
  • Collection(s):
    National Marine Fisheries Service (NMFS)
  • Main Document Checksum:
  • File Type:
  • Supporting Files:
    No Additional Files
    1. Filetype[PDF - 2.52 MB]
      Personal Author:
      Turnock, Benjamin J.; McGilliard, Carey R.; Palsson, Wayne;
      Published Date:
      2017
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      Summary of Changes in Assessment Inputs: 1) 2016-2017 catch data were added to the model and 2015 catch was updated to include October to December catch in that year. 2) 2016 and 2017 fishery length composition data were added to the model and 2015 f...
      File Type:
      Filetype[PDF - 2.52 MB]
    2. Filetype[PDF - 800.54 KB]
      Personal Author:
      Turnock, Benjamin J.; Bryan, Meaghan; Wilderbuer, Thomas K.;
      Published Date:
      2017
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      Survey abundance estimates for the shallow-water complex were higher in 2017 compared to 2015 for all species except Yellowfin sole and Butter sole. The random effects model was used to estimate current biomass for estimating the OFL and ABC values. ...
      File Type:
      Filetype[PDF - 800.54 KB]
    3. Filetype[PDF - 2.40 MB]
      Personal Author:
      Dorn, Martin; Aydin, Kerim; Fissel, Ben; Jones, Darin; McCarthy, Abigail; Palsson, Wayne; Spalinger, Kally;
      Published Date:
      2017
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      The base model projection of female spawning biomass in 2018 is 342,683 t, which is 57.5% of unfished spawning biomass (based on average post-1977 recruitment) and above B40% (238,000 t), thereby placing GOA pollock in sub-tier “a” of Tier 3. The...
      File Type:
      Filetype[PDF - 2.40 MB]
    4. Filetype[PDF - 877.01 KB]
      Personal Author:
      Ormseth, Olav A.
      Published Date:
      2017
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      Squids in the Gulf of Alaska (GOA) are managed as a single stock complex comprising approximately 15 species. Historically squids were managed as part of the GOA “Other Species” complex, which included squids, octopuses, sharks, and sculpins. In ...
      File Type:
      Filetype[PDF - 877.01 KB]
    5. Filetype[PDF - 144.45 KB]
      Personal Author:
      Echave, Katy; Hulson, Peter-John;
      Published Date:
      2017
      Series:
      Gulf of Alaska Stock Assessments
      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 participated in a stock assessment prioritization pr...
      File Type:
      Filetype[PDF - 144.45 KB]
    6. Filetype[PDF - 1.95 MB]
      Personal Author:
      Hanselman, Dana H.; Shotwell, S. Kalei; Heifetz, Jonathan;
      Published Date:
      2017
      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 - 1.95 MB]
    7. Filetype[PDF - 5.63 MB]
      Personal Author:
      Bryan, Meaghan D.
      Published Date:
      2017
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      The Gulf of Alaska (GOA) northern and southern rock sole assessment has been moved to a 4-year assessment cycle per the stock assessment prioritization schedule. During years when a full assessment is not completed a partial assessment will be done. ...
      File Type:
      Filetype[PDF - 5.63 MB]
    8. Filetype[PDF - 690.28 KB]
      Personal Author:
      Spies, Ingrid; Nichol, Dan; Aydin, Kerim; TenBrink, Todd T.;
      Published Date:
      2017
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      The estimated 2018 total sculpin complex biomass in the GOA is 33,134 t. This represents a small decrease from the last full assessment in 2015. The recommended 2018 and 2019 ABC is 5,301 t based on an FABC=0.16 and the 2018 and 2019 overfishing leve...
      File Type:
      Filetype[PDF - 690.28 KB]
    9. Filetype[PDF - 11.37 MB]
      Personal Author:
      Hanselman, Dana H.; Rodgveller, Cara J.; Lunsford, Chris R.; Fenske, Kari H.;
      Published Date:
      2017
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      The longline survey abundance index increased 14% from 2016 to 2017 following a 28% increase in 2016 from 2015. The lowest point of the time series was 2015. The fishery abundance index decreased 23% from 2015 to 2016 and is the time series low (the ...
      File Type:
      Filetype[PDF - 11.37 MB]
    10. Filetype[PDF - 2.72 MB]
      Personal Author:
      McGilliard, Carey R.; Palsson, Wayne;
      Published Date:
      2017
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      A full, age-structured assessment is presented for GOA rex sole. In previous years, the biomass estimates of the assessment were used to calculate OFLs and ABCs using a Tier 5 management approach because FOFL and FABC reference points estimated from ...
      File Type:
      Filetype[PDF - 2.72 MB]
    11. Filetype[PDF - 829.97 KB]
      Personal Author:
      Echave, Katy; Hulson, Peter-John;
      Published Date:
      2017
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      Gulf of Alaska rockfish are assessed on a biennial stock assessment schedule. For this on-cycle year, we incorporate new survey biomass. Following the recommendation of the North Pacific Fisheries Management Council for Tier 5 stocks such as GOA shor...
      File Type:
      Filetype[PDF - 829.97 KB]
    12. Filetype[PDF - 2.45 MB]
      Personal Author:
      Ormseth, Olav A.
      Published Date:
      2017
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      There are currently no target fisheries for skates in the Gulf of Alaska (GOA), and directed fishing for skates is prohibited. Incidental catches in other fisheries are sufficiently high that skates are considered to be “in the fishery” and harve...
      File Type:
      Filetype[PDF - 2.45 MB]
    13. Filetype[PDF - 7.61 MB]
      Personal Author:
      Barbeaux, Steven J.; Aydin, Kerim; Fissel, Ben; Holsman, Kirstin; Palsson, Wayne; Shotwell, S. Kalei; Yang, Qiong; Zador, Stephani;
      Published Date:
      2017
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      The addition of the new method for estimating the fishery catch-at-lengths and applying ADF&G port sampling data in the pot fishery made only a small difference in model results and was an improvement of how estimates were derived. Model 17.09.35 pro...
      File Type:
      Filetype[PDF - 7.61 MB]
    14. Filetype[PDF - 1.52 MB]
      Published Date:
      2017
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      The National Standard Guidelines for Fishery Management Plans published by the National Marine Fisheries Service (NMFS) require that a stock assessment and fishery evaluation (SAFE) report be prepared and reviewed annually for each fishery management...
      File Type:
      Filetype[PDF - 1.52 MB]
    15. Filetype[PDF - 1.36 MB]
      Personal Author:
      Olson, Andrew; Stahl, Jennifer; Williams, Ben; Jaenicke, Mike; Meyer, Scott;
      Published Date:
      2017
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      The results of a preliminary statistical age-structured assessment model (ASA) are not presented this year due to personnel changes. The ASA will be presented in full in 2018 or 2019; updates to the status quo methodology are presented here.
      File Type:
      Filetype[PDF - 1.36 MB]
    16. Filetype[PDF - 1.14 MB]
      Personal Author:
      Ormseth, Olav A.; Conners, M.Elizabeth;
      Published Date:
      2017
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      At least seven species of octopus are found in the Gulf of Alaska (GOA). For management purposes, all octopus species are grouped into a single assemblage. Neither the relative abundances of the various species or the species composition of the comme...
      File Type:
      Filetype[PDF - 1.14 MB]
    17. Filetype[PDF - 189.17 KB]
      Personal Author:
      Fenske, Kari H.; Lunsford, Chris R.; Hulson, Peter-John; Hanselman, Dana H.; Shotwell, S. Kalei;
      Published Date:
      2017
      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. Prior to 2017, Gulf of Alaska (GOA) rockfish were assessed on a biennial stock assessment schedule to coincide...
      File Type:
      Filetype[PDF - 189.17 KB]
    18. Filetype[PDF - 1.34 MB]
      Personal Author:
      Tribuzio, Cindy A.; Echave, Katy; Coutre, Karson;
      Published Date:
      2017
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      The Other Rockfish (OR) complex (Table 16.1 and Figure 16.1) in the Gulf of Alaska (GOA) is assessed on a biennial stock assessment schedule to coincide with the availability of new trawl survey biomass estimates. The complex acceptable biological ca...
      File Type:
      Filetype[PDF - 1.34 MB]
    19. Filetype[PDF - 751.20 KB]
      Personal Author:
      Lowe, Sandra A.
      Published Date:
      2017
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      Gulf of Alaska (GOA) Atka mackerel have been moved to a biennial stock assessment schedule to coincide with the availability of new survey data from the biennial trawl survey. A full assessment was presented in 2015, which included data from the 2015...
      File Type:
      Filetype[PDF - 751.20 KB]
    20. Filetype[PDF - 3.72 MB]
      Personal Author:
      Spies, Ingrid; Aydin, Kerim; Ianelli, James N.; Palsson, Wayne;
      Published Date:
      2017
      Series:
      Gulf of Alaska Stock Assessments
      Description:
      Arrowtooth flounder biomass estimates in the current model have changed relative to the projection model estimates in 2016. The model projection of spawning biomass for 2018, assuming fishing mortality equal to the recent 5-year average, was 873,789 ...
      File Type:
      Filetype[PDF - 3.72 MB]

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