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Stock assessment of uku (Aprion virescens) in Hawaii, 2020
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2020
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Description:The uku snapper (Aprion virescens, family Lutjanidae) inhabits the coastal waters of the main Hawaiian Islands (MHI) at depths ranging from 20 to 200 meters. The MHI uku population was first assessed with other snappers using a catch-only method applied at the family level (Sabater & Kleiber 2013). That assessment determined that snappers were not overfished. In 2017, uku was assessed at the species-level using a length-based mortality model and a relatively simple numerical population model to obtain fishing mortality rates and spawning potential ratio (SPR). Using this approach, it was determined that the stock was not experiencing overfishing (Nadon 2017). The current assessment builds off these previous efforts and uses catch, catch-per-unit-effort (CPUE), diver surveys, and size composition time-series in the Stock Synthesis modeling framework (Methot & Wetzel 2013). Stock Synthesis 3.30 is an integrated statistical catch-at-age model that fits a population model to relative abundance and size composition data in a likelihood-based statistical framework to generate maximum likelihood estimates of population parameters, derived outputs, and their associated variability. These outputs are then used to determine stock status and to develop stock projections under different management scenarios.
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Rights Information:Public Domain
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Compliance:Submitted
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