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Acoustic investigation of the shoaling dynamics of sardine sardinops sagax populations : implications for acoustic surveys
Bibliography: pages 113-117.
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| Format: | Thesis |
| Language: | English |
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Department of Biological Sciences
2016
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| _version_ | 1867613807778463744 |
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| access_status_str | Open Access |
| author | Coetzee, Janet Claire |
| author2 | Field, John G |
| author_browse | Coetzee, Janet Claire Field, John G |
| author_facet | Field, John G Coetzee, Janet Claire |
| author_sort | Coetzee, Janet Claire |
| collection | Thesis |
| description | Bibliography: pages 113-117. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/19818 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:42:01.444Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Department of Biological Sciences |
| publisherStr | Department of Biological Sciences |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/19818 Acoustic investigation of the shoaling dynamics of sardine sardinops sagax populations : implications for acoustic surveys Coetzee, Janet Claire Field, John G Champion, Harold Biological Sciences Bibliography: pages 113-117. 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. 2016-05-24T09:15:19Z 2016-05-24T09:15:19Z 1997 Master Thesis Masters MSc http://hdl.handle.net/11427/19818 eng application/pdf Department of Biological Sciences Faculty of Science University of Cape Town |
| spellingShingle | Biological Sciences Coetzee, Janet Claire Acoustic investigation of the shoaling dynamics of sardine sardinops sagax populations : implications for acoustic surveys |
| thesis_degree_str | Master's |
| title | Acoustic investigation of the shoaling dynamics of sardine sardinops sagax populations : implications for acoustic surveys |
| title_full | Acoustic investigation of the shoaling dynamics of sardine sardinops sagax populations : implications for acoustic surveys |
| title_fullStr | Acoustic investigation of the shoaling dynamics of sardine sardinops sagax populations : implications for acoustic surveys |
| title_full_unstemmed | Acoustic investigation of the shoaling dynamics of sardine sardinops sagax populations : implications for acoustic surveys |
| title_short | Acoustic investigation of the shoaling dynamics of sardine sardinops sagax populations : implications for acoustic surveys |
| title_sort | acoustic investigation of the shoaling dynamics of sardine sardinops sagax populations implications for acoustic surveys |
| topic | Biological Sciences |
| url | http://hdl.handle.net/11427/19818 |
| work_keys_str_mv | AT coetzeejanetclaire acousticinvestigationoftheshoalingdynamicsofsardinesardinopssagaxpopulationsimplicationsforacousticsurveys |