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<div class="page-header"><h1 id="sablefishmse---management-strategy-evaluation-for-alaska-sablefish">SablefishMSE - Management strategy evaluation for Alaska Sablefish<a class="anchor" aria-label="anchor" href="#sablefishmse---management-strategy-evaluation-for-alaska-sablefish"></a>
</h1></div>
<p><strong>Joshua A. Zahner (<em>UAF</em>)</strong>, Ben Williams (<em>NOAA</em>), Curry Cunningham (<em>UAF</em>), Dan Goethel (<em>NOAA</em>), Matt Cheng (<em>UAF</em>), Maia Kapur (<em>NOAA</em>), Chris Lunsford (<em>NOAA</em>)</p>
<p>A management strategy evaluation simulation framework for assessing alternative management options for Alaska sablefish in the North Pacific ocean, under the jurisidiction of the U.S. North Pacific Fisheries Management Council.</p>
<p>The MSE operating model (OM) is built using the <a href="https://github.com/BenWilliams-NOAA/afscOM" class="external-link"><code>afscOM</code> R package</a>, a generalized fisheries operating model implementation. The OM is an age-structured (ages 2-31), multi-sex (male and female), single region (coastwide Alaska) model, with two active fisheries (fixed gear and trawl) and two scientific surveys (NOAA domestic longline and NOAA trawl), built with the same demographic parameters as are used/estimated by the <a href="https://github.com/dgoethel/2023-Sablefish-SAFE/" class="external-link">2023 Alaska sablefish stock assessment</a> (Goethel et al. 2023). The MSE estimation model (EM) is a modified version of the <a href="https://github.com/Craig44/SpatialSablefishAssessment" class="external-link"><code>SpatialSablefishAssessment</code> TMB model</a> built in 2022, that was updated to include a recruitment bias ramp and to fit to sex-disaggregated age composition data.</p>
<p>A range of recruitment models and harvest control rules (HCRs) are implemented to allow for testing the efficacy of many different management strategies across a range of reasonable future recruitment scenarios.</p>
<p>Examples of how to run the full MSE simulation loop is available at <code>dev/sablefish_mse_example.r</code></p>
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<h3 id="project-background-and-objectives">Project background and objectives<a class="anchor" aria-label="anchor" href="#project-background-and-objectives"></a>
</h3>
<p>Alaskan sablefish (<em>Anoplopoma fimbria</em>) are currently managed using the North Pacific Fishery Management Council’s (NPFMC) <span class="math inline"><em>F</em><sub>40</sub></span> harvest control rule (HCR). However, sablefish are a long-lived, relatively slow growing species and generic HCRs aimed at maximizing yearly harvest (e.g., spawner-per-recruit, SPR, based maximum sustainable yield proxies) may not perform adequately for achieving key conservation and fishery performance metrics (e.g., maintaining a robust age structure and maximizing long-term fishery yield). To address scientific and stakeholder concerns regarding the robustness of the current HCR for sablefish, a closed loop simulation tool will be developed and implemented to test the efficacy and robustness of current and alternate HCRs as well as spawning metrics through management strategy evaluation (MSE; Punt et al. 2016). The aim of the study will be to identify HCRs that can achieve both conservation and economic priorities, while also exploring how assumptions regarding calculation of spawning potential impact HCR robustness.</p>
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<h3 id="references">References<a class="anchor" aria-label="anchor" href="#references"></a>
</h3>
<p>Goethel, D.R., Cheng, M.L.H., Echave, K.B., Marsh, C., Rodgveller, C.J., Shotwell, K., Siwicke, K., 2023. Stock Assessment of the sablefish stock in Alaska. North Pacific Fisheries Management Council, Anchorage, AK.</p>
<p>Punt, A.E., Butterworth, D.S., de Moor, C.L., De Oliveira, J.A.A., Haddon, M., 2016. Management strategy evaluation: best practices. Fish and Fisheries 17, 303–334. <a href="https://doi.org/10.1111/faf.12104" class="external-link uri">https://doi.org/10.1111/faf.12104</a></p>
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<li>Joshua Zahner <br><small class="roles"> Author </small> </li>
<li>Benjamin Williams <br><small class="roles"> Author, maintainer </small> </li>
<li>Dan Goethel <br><small class="roles"> Author </small> </li>
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