A preliminary SCAA/ASPM assessment of white hake

 

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dc.contributor.author Butterworth, Doug S
dc.contributor.author Rademeyer, Rebecca A
dc.date.accessioned 2016-04-19T14:00:00Z
dc.date.available 2016-04-19T14:00:00Z
dc.date.issued 2008
dc.identifier.citation Butterworth, D. S., & Rademeyer, R. A. (2008). A preliminary SCAA/ASPM assessments of white hake. MARAM: University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/18989
dc.description.abstract The ASPM (SCAA) methodology presented in Butterworth and Rademeyer (2008), with an adjustment to be able to incorporate data on proportions at length, is applied to white hake. In a preliminary and (for reasons of time) restricted analysis, four scenarios are consider for the period from 1963 when abundance indices first become available. These reflect the assumptions that spawning biomass in 1963 was at 25% and 50% of its pristine level, and that the catch of hake of length less than 60 cm was either all white hake or all red hake, with the latter assumption leading to somewhat more optimistic appraisals of the current status of white hake. Model fits to survey index trends are broadly reasonable, though there are some difficulties with proportions at length data which would likely be better addressed in future analyses by adopting a length-specific rather than an age-specific selectivity framework. All four scenarios considered suggest an increase in spawning biomass over the last decade, and that the current fishing mortality is less than FMSY. Nevertheless the preliminary nature of all results must be stressed, particularly as time has thus far allowed only a very limited number of variants of the assessment to be investigated. en_ZA
dc.language eng en_ZA
dc.title A preliminary SCAA/ASPM assessment of white hake en_ZA
dc.type Working Paper en_ZA
dc.date.updated 2016-04-19T13:58:49Z
uct.type.publication Research en_ZA
uct.type.resource Research paper en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Science en_ZA
dc.publisher.department Marine Resource Assessment and Management Group en_ZA
uct.type.filetype Text
uct.type.filetype Image


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