Acoustic investigation of the shoaling dynamics of sardine sardinops sagax populations : implications for acoustic surveys

Simple item page
dc.contributor.advisorField, John Gen_ZA
dc.contributor.advisorChampion, Harolden_ZA
dc.contributor.authorCoetzee, Janet Claireen_ZA
dc.date.accessioned2016-05-24T09:15:19Z
dc.date.available2016-05-24T09:15:19Z
dc.date.issued1997en_ZA
dc.descriptionBibliography: pages 113-117.en_ZA
dc.description.abstractThe total allowable catches (TA Cs) of both anchovy and sardine in South Africa are determined by assessment methods which rely on absolute estimates of recruitment and spawner biomass each year. The validity of the TAC set for each species each year is heavily dependent on the accuracy and precision of the biomass estimates. The method used for both anchovy and sardine has been acoustic surveys on a random stratified grid covering the known range of the species. These surveys have, however, been designed according to the life history patterns of anchovy, which result in a particular occupation of the pelagic environment. This study investigated the shoaling dynamics of sardine at various scales in both the horizontal and vertical dimension in an attempt to ascertain whether these surveys are adequate to characterise the occupation of space by sardine. Hydro-acoustic data collected during 5 meso-scale surveys in 1994 and 1995 was used to study the shoaling dynamics of sardine, Sardinops sagax on the western Agulhas Bank of South Africa. Results of this study indicate the presence of spatial structure in sardine aggregations at both the shoal and meso-scale level.en_ZA
dc.identifier.apacitationCoetzee, J. C. (1997). <i>Acoustic investigation of the shoaling dynamics of sardine sardinops sagax populations : implications for acoustic surveys</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Biological Sciences. Retrieved from http://hdl.handle.net/11427/19818en_ZA
dc.identifier.chicagocitationCoetzee, Janet Claire. <i>"Acoustic investigation of the shoaling dynamics of sardine sardinops sagax populations : implications for acoustic surveys."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 1997. http://hdl.handle.net/11427/19818en_ZA
dc.identifier.citationCoetzee, J. 1997. Acoustic investigation of the shoaling dynamics of sardine sardinops sagax populations : implications for acoustic surveys. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Coetzee, Janet Claire AB - The total allowable catches (TA Cs) of both anchovy and sardine in South Africa are determined by assessment methods which rely on absolute estimates of recruitment and spawner biomass each year. The validity of the TAC set for each species each year is heavily dependent on the accuracy and precision of the biomass estimates. The method used for both anchovy and sardine has been acoustic surveys on a random stratified grid covering the known range of the species. These surveys have, however, been designed according to the life history patterns of anchovy, which result in a particular occupation of the pelagic environment. This study investigated the shoaling dynamics of sardine at various scales in both the horizontal and vertical dimension in an attempt to ascertain whether these surveys are adequate to characterise the occupation of space by sardine. Hydro-acoustic data collected during 5 meso-scale surveys in 1994 and 1995 was used to study the shoaling dynamics of sardine, Sardinops sagax on the western Agulhas Bank of South Africa. Results of this study indicate the presence of spatial structure in sardine aggregations at both the shoal and meso-scale level. DA - 1997 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1997 T1 - Acoustic investigation of the shoaling dynamics of sardine sardinops sagax populations : implications for acoustic surveys TI - Acoustic investigation of the shoaling dynamics of sardine sardinops sagax populations : implications for acoustic surveys UR - http://hdl.handle.net/11427/19818 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/19818
dc.identifier.vancouvercitationCoetzee JC. Acoustic investigation of the shoaling dynamics of sardine sardinops sagax populations : implications for acoustic surveys. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 1997 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/19818en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Biological Sciencesen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherBiological Sciencesen_ZA
dc.titleAcoustic investigation of the shoaling dynamics of sardine sardinops sagax populations : implications for acoustic surveysen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
thesis_sci_1997_coetzee_janet_claire.pdf
Size:
1.8 MB
Format:
Adobe Portable Document Format
Description:
Download
Collections
Masters