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Stock assessment of the main Hawaiian islands deep7 bottomfish complex through 2010
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2011
[PDF-7.30 MB]
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Description:"A stock assessment of the main Hawaiian Islands 'Deep7' bottomfish complex was conducted through fishing year 2010, including projections to determine total allowable commercial catches (TACs) and their probabilities of overfishing. This assessment was conducted using re-audited bottomfish catch and effort data from commercial catch reports for the years 1948-2010. Standardized catch-per-unit effort (CPUE) for the Deep7 bottomfish was estimated using catch and effort data from the handline fishery. Model selection techniques were applied to choose the structural form to standardize CPUE. Recommendations of the Western Pacific Stock Assessment Review panel concerning the 2008 stock assessment were addressed in this assessment. The recommendations that were directly addressed in this assessment were: (i) develop credible standardized CPUE time series; (ii) construct noncommercial bottomfish catch histories; (iii) develop an informative prior for intrinsic growth rate using metadata or other analyses; and, (iv) assess the main Hawaiian Islands bottomfish complex as a single stock unit and ensure appropriate testing of CPUE uncertainty through sensitivity analyses. A Bayesian production model was used to estimate time series of Deep7 bottomfish exploitable biomasses and harvest rates under alternative scenarios of unreported catch and standardized CPUE. This model was also used to conduct stochastic short-term projections of future catches and associated risks of overfishing. These projections explicitly included uncertainty in the posterior distribution of estimated bottomfish biomass in 2010 and population dynamics parameters. Results of the catch and CPUE analyses, production modeling, and projections are summarized. Decision tables are provided to address uncertainty about the effects of selecting commercial fishery Deep7 TACs for fishing years 2012-2013 under alternative CPUE scenarios"--Abstract.
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Rights Information:Public Domain
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