The estimation of uncapped acoustic survey biomass from capped data

 

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dc.contributor.author Cunningham, Carryn L
dc.contributor.author Butterworth, Doug S
dc.contributor.author Coetzee, J
dc.date.accessioned 2016-04-11T11:09:56Z
dc.date.available 2016-04-11T11:09:56Z
dc.date.issued 2007
dc.identifier.citation Cunningham, C.L., Butterworth, D.S., & Coetzee, J. (2007). The estimation of uncapped acoustic survey biomass from capped data. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/18747
dc.description.abstract Management of the South African sardine and anchovy resources is critically dependent on estimates of recruitment and spawner biomass obtained from hydroacoustic surveys. These surveys commenced in 1984, but in 1997 new equipment (an EK500 echo sounder) replaced the older EK400 echo sounder. The introduction of the EK500 echo sounder revealed a saturation problem with the EK400 echo sounder, particularly for sardine (Coetzee 2003). Survey estimates since June 1997 were initially ‘capped’ at - 29dB for assessment purposes, to maintain a comparable time-series from 1984. en_ZA
dc.language eng en_ZA
dc.title The estimation of uncapped acoustic survey biomass from capped data en_ZA
dc.type Working Paper en_ZA
dc.date.updated 2016-04-11T11:04:23Z
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
dc.identifier.apacitation Cunningham, C. L., Butterworth, D. S., & Coetzee, J. (2007). <i>The estimation of uncapped acoustic survey biomass from capped data</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group. Retrieved from http://hdl.handle.net/11427/18747 en_ZA
dc.identifier.chicagocitation Cunningham, Carryn L, Doug S Butterworth, and J Coetzee <i>The estimation of uncapped acoustic survey biomass from capped data.</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group, 2007. http://hdl.handle.net/11427/18747 en_ZA
dc.identifier.vancouvercitation Cunningham CL, Butterworth DS, Coetzee J. The estimation of uncapped acoustic survey biomass from capped data. 2007 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/18747 en_ZA
dc.identifier.ris TY - Working Paper AU - Cunningham, Carryn L AU - Butterworth, Doug S AU - Coetzee, J AB - Management of the South African sardine and anchovy resources is critically dependent on estimates of recruitment and spawner biomass obtained from hydroacoustic surveys. These surveys commenced in 1984, but in 1997 new equipment (an EK500 echo sounder) replaced the older EK400 echo sounder. The introduction of the EK500 echo sounder revealed a saturation problem with the EK400 echo sounder, particularly for sardine (Coetzee 2003). Survey estimates since June 1997 were initially ‘capped’ at - 29dB for assessment purposes, to maintain a comparable time-series from 1984. DA - 2007 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2007 T1 - The estimation of uncapped acoustic survey biomass from capped data TI - The estimation of uncapped acoustic survey biomass from capped data UR - http://hdl.handle.net/11427/18747 ER - en_ZA


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