Assessment of the South African anchovy resource

 

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dc.contributor.author Cunningham, Carryn L
dc.contributor.author Butterworth, Doug S
dc.date.accessioned 2016-04-12T14:00:54Z
dc.date.available 2016-04-12T14:00:54Z
dc.date.issued 2007
dc.identifier.citation Cunningham, C. L., & Butterworth, D. S. (2007). Assessment of the South African anchovy resource. Unpublished MCM Document MCM/2007/SEPT/SWG-PEL/05. 29pp. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/18823
dc.description.abstract The assessment of the South African anchovy resource has been updated from the last assessment (Cunningham and Butterworth 2004) to take account of new data and data adaptations as follows: i) an update in the time series of November spawner biomass and May recruitment estimates from acoustic surveys, such that the new time series reflects uncapped estimates of biomass based on new target strength calculations throughout, ii) a new method of using a monthly cut-off length to split recruits from 1-year-olds in the commercial catch (previously recruits and 1-year-olds were assumed to be caught in different months), and iii) new data for 2004 to 2006 which were not included in the last assessment conducted in 2004. In addition, this assessment has been modified from previous assessments to include: iv) a plus group of age 4 (previously anchovy were assumed to spawn at age 4 and then die), v) accounting for the introduction of the additional season by assuming the juvenile catch was taken in a pulse on 15th June prior to 1999 and on 15th July from 1999 onwards, and iv) the adult catch now assumed to be taken in a pulse on 1st April (previously assumed to be taken halfway between November and March). This document details the updated assessment model and gives the assessment results for the base case and robustness tests.
dc.language eng en_ZA
dc.title Assessment of the South African anchovy resource en_ZA
dc.type Working Paper en_ZA
dc.date.updated 2016-04-12T13:59:59Z
uct.type.publication Research en_ZA
uct.type.resource Working 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
dc.identifier.apacitation Cunningham, C. L., & Butterworth, D. S. (2007). <i>Assessment of the South African anchovy resource</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group. Retrieved from http://hdl.handle.net/11427/18823 en_ZA
dc.identifier.chicagocitation Cunningham, Carryn L, and Doug S Butterworth <i>Assessment of the South African anchovy resource.</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group, 2007. http://hdl.handle.net/11427/18823 en_ZA
dc.identifier.vancouvercitation Cunningham CL, Butterworth DS. Assessment of the South African anchovy resource. 2007 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/18823 en_ZA
dc.identifier.ris TY - Working Paper AU - Cunningham, Carryn L AU - Butterworth, Doug S AB - The assessment of the South African anchovy resource has been updated from the last assessment (Cunningham and Butterworth 2004) to take account of new data and data adaptations as follows: i) an update in the time series of November spawner biomass and May recruitment estimates from acoustic surveys, such that the new time series reflects uncapped estimates of biomass based on new target strength calculations throughout, ii) a new method of using a monthly cut-off length to split recruits from 1-year-olds in the commercial catch (previously recruits and 1-year-olds were assumed to be caught in different months), and iii) new data for 2004 to 2006 which were not included in the last assessment conducted in 2004. In addition, this assessment has been modified from previous assessments to include: iv) a plus group of age 4 (previously anchovy were assumed to spawn at age 4 and then die), v) accounting for the introduction of the additional season by assuming the juvenile catch was taken in a pulse on 15th June prior to 1999 and on 15th July from 1999 onwards, and iv) the adult catch now assumed to be taken in a pulse on 1st April (previously assumed to be taken halfway between November and March). This document details the updated assessment model and gives the assessment results for the base case and robustness tests. DA - 2007 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2007 T1 - Assessment of the South African anchovy resource TI - Assessment of the South African anchovy resource UR - http://hdl.handle.net/11427/18823 ER - en_ZA


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