Assessment of the Atka mackerel stock in the Bering Sea and Aleutian Islands
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Assessment of the Atka mackerel stock in the Bering Sea and Aleutian Islands

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  • Alternative Title:
    BSAI Chapter 17
  • Description:
    Total 2016 catch estimate was updated, and the projected total catch for 2017 was set to nearly equal the TAC (64,500 t), based on the catch amounts occurring after Oct. 1 in recent years. The 2016 fishery age composition data were added. The 2016 Aleutian Islands survey age composition estimates were added. The estimated average selectivity for 2012-2016 was used for projections. We assume that approximately 75% of the BSAI-wide ABC is likely to be taken under the revised Steller Sea Lion Reasonable and Prudent Alternatives (SSL RPAs) implemented in 2015. This percentage was applied to the 2018 and 2019 maximum permissible ABCs, and those reduced amounts were assumed to be caught in order to estimate the 2018 and 2019 ABCs and OFL values. As in 2016, the sample sizes specified for fishery age composition data were rescaled to have the same means as in the baseline model but varied relative to the number of hauls for the fishery. The 2016 data were added. The survey age composition data were tuned using the Francis (2011) method. The 2016 data were added. 8. As requested, refinements to the time-varying fishery selectivity inputs were made using the statistical weighting method for the time-varying fishery selectivity variance term, as was used for the age composition data.
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