Assessment of the thornyhead stock complex in the Gulf of Alaska
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Assessment of the thornyhead stock complex in the Gulf of Alaska

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  • Alternative Title:
    GOA Chapter 15
  • 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 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 for this year 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. Because we have chosen to perform a partial stock assessment, 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 rerunning the random effects model” (SSC minutes – February 2017).
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