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Stock assessment update of the status of the bottomfish resource of American Samoa, the Commonwealth of the Northern Mariana Islands, and Guam, 2012
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2012
[PDF-2.76 MB]
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Description:"In this report, we update the status of bottomfish complexes in Guam, American Samoa, and the Commonwealth of the Northern Mariana Islands using the same production modeling as used in the previous stock assessment. A Bayesian statistical framework is applied to estimate parameters of a production model fit to a time series of annual CPUE statistics. This approach provides direct estimates of parameter uncertainty for status determination. The surplus production model includes both process error in biomass production dynamics and observation error in the catch-per-unit effort data. Alternative models with differing prior assumptions about carrying capacity and the ratio of initial stock biomass at the beginning of the assessment time period to carrying capacity are evaluated using the Deviance information criterion. The sensitivity of status determination results to catch data and model assumptions is also evaluated. Stock status determinations based on the base case model with the best fit to the CPUE data appear relatively robust. Overall, the American Samoa, the Commonwealth of the Northern Mariana Islands, and the Guam bottomfish complexes were not depleted and were not experiencing overfishing in 2010, the most recent year of the stock assessment estimates."
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Rights Information:CC0 Public Domain
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Compliance:Library
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