The estimation of uncapped acoustic survey biomass from capped data

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dc.contributor.authorCunningham, Carryn L
dc.contributor.authorButterworth, Doug S
dc.contributor.authorCoetzee, J
dc.date.accessioned2016-04-11T11:09:56Z
dc.date.available2016-04-11T11:09:56Z
dc.date.issued2007
dc.date.updated2016-04-11T11:04:23Z
dc.description.abstractManagement 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.identifier.apacitationCunningham, 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/11427/18747en_ZA
dc.identifier.chicagocitationCunningham, 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/11427/18747en_ZA
dc.identifier.citationCunningham, C.L., Butterworth, D.S., & Coetzee, J. (2007). The estimation of uncapped acoustic survey biomass from capped data.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
dc.identifier.urihttp://hdl.handle.net/11427/18747
dc.identifier.vancouvercitationCunningham 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/11427/18747en_ZA
dc.languageengen_ZA
dc.publisher.departmentMarine Resource Assessment and Management Groupen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.titleThe estimation of uncapped acoustic survey biomass from capped dataen_ZA
dc.typeWorking Paperen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceResearch paperen_ZA
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