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Modelling the relative impacts of trawling and longlining on Cape hake Merluccius capensis on the inshore Agulhas bank
Bibliograpy: leaves 87-101.
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| Main Author: | |
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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Department of Biological Sciences
2014
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| _version_ | 1867613256517943297 |
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| access_status_str | Open Access |
| author | Jayiya, Terence Phinda |
| author2 | Field, John G |
| author_browse | Field, John G Jayiya, Terence Phinda |
| author_facet | Field, John G Jayiya, Terence Phinda |
| author_sort | Jayiya, Terence Phinda |
| collection | Thesis |
| description | Bibliograpy: leaves 87-101. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/6105 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:33:15.376Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2014 |
| publishDateRange | 2014 |
| publishDateSort | 2014 |
| 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:11427/6105 Modelling the relative impacts of trawling and longlining on Cape hake Merluccius capensis on the inshore Agulhas bank Jayiya, Terence Phinda Field, John G Moloney, Coleen Leslie, Rob Zoology Bibliograpy: leaves 87-101. A Geographic Information System (GIS) is used to elucidiate vertical and horizontal patterns of distribution of Merluccius capensis on the inshore south coast (20°-27°E) of South Africa. Catch data used to compare the size distribution in catches made by commercial trawls and longlines off the South Coast (20°E). Results show that M.capensis size increases with depth and that the distribution of fish < 30 cm is mostly west of 23° E with isolated pockets east of that region. No seasonal differences were found in the distribution of this species. Spatial mapping of survey trawl and longline grounds of the Agulhas bank whereas longlines operate over rocky areas. Size comparisons of the catches of the two fishing methods reveal that longlines catch very few fish that are < 60 cm whereas trawl cataches are dominated by M. capensis of length < 60 cm. Analyses also revealed sex compostion in longline cataches to be different to that of trawls. All these results are discussed in relation to the ecology of M. capensis and the areas where data come from. Using size selectivity properties, the potential impacts of longlining and commercial trawling on the South Coast M. capensis (east of 20° E) are modelled with a yield per recruit and spawner biomass per recruit model. First, the age-specific selectivity vectors of the two fleets are estimated from catch data (length frequencies). 2014-08-13T14:03:30Z 2014-08-13T14:03:30Z 2001 Master Thesis Masters MSc http://hdl.handle.net/11427/6105 eng application/pdf Department of Biological Sciences Faculty of Science University of Cape Town |
| spellingShingle | Zoology Jayiya, Terence Phinda Modelling the relative impacts of trawling and longlining on Cape hake Merluccius capensis on the inshore Agulhas bank |
| thesis_degree_str | Master's |
| title | Modelling the relative impacts of trawling and longlining on Cape hake Merluccius capensis on the inshore Agulhas bank |
| title_full | Modelling the relative impacts of trawling and longlining on Cape hake Merluccius capensis on the inshore Agulhas bank |
| title_fullStr | Modelling the relative impacts of trawling and longlining on Cape hake Merluccius capensis on the inshore Agulhas bank |
| title_full_unstemmed | Modelling the relative impacts of trawling and longlining on Cape hake Merluccius capensis on the inshore Agulhas bank |
| title_short | Modelling the relative impacts of trawling and longlining on Cape hake Merluccius capensis on the inshore Agulhas bank |
| title_sort | modelling the relative impacts of trawling and longlining on cape hake merluccius capensis on the inshore agulhas bank |
| topic | Zoology |
| url | http://hdl.handle.net/11427/6105 |
| work_keys_str_mv | AT jayiyaterencephinda modellingtherelativeimpactsoftrawlingandlongliningoncapehakemerlucciuscapensisontheinshoreagulhasbank |