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Assessment of a pond for oyster hatchery development in South Africa
This study assessed a man-made salt-water pond (saltwater pond 1 SP1) as a potential site for the development of an oyster hatchery in Velddrif, South Africa. Over the study period it was observed that the site was not suitable for oyster larvae culture due to the following factors: temperature spik...
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| Format: | Thesis |
| Language: | English |
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Marine Research (MA-RE) Institute
2015
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| _version_ | 1867613170285150208 |
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| access_status_str | Open Access |
| author | Simmons, Aron |
| author2 | Jackson, Sue |
| author_browse | Jackson, Sue Simmons, Aron |
| author_facet | Jackson, Sue Simmons, Aron |
| author_sort | Simmons, Aron |
| collection | Thesis |
| description | This study assessed a man-made salt-water pond (saltwater pond 1 SP1) as a potential site for the development of an oyster hatchery in Velddrif, South Africa. Over the study period it was observed that the site was not suitable for oyster larvae culture due to the following factors: temperature spikes during the summer months, low dissolved oxygen levels, high salinity levels, and the proliferation of the filamentous green algae (FGA), mainly the sp. Rhizoclonium implexum. Widespread patches of R. implexum were observed within SP1 and increased in biomass over the study period. Biomass patterns were not measured within this study, however microcosm experiments directed at nutrient depletion rates caused by FGA proliferation assessed the effect of the FGA on the system. Within microcosm experiments with and without FGA, nitrite within the system was significantly lower in the FGA inclusion treatment. Pond nutrient dynamics within the system indicated that widespread nutrient depletion occurred between the incoming water and the rest of the pond, and it was clear that the inflow station had significantly higher nutrient concentrations than all the other stations within SP1. Phytoplankton concentrations were extremely low and could be attributed to the FGA dominated state within SP1. Taken together with the fact the water levels within SP1 were not stable, the data suggested that SP1 was not an optimal source of seawater for either algal or larval oyster culture, and an alternative oyster hatchery site should be assessed. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/15723 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:31:53.390Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2015 |
| publishDateRange | 2015 |
| publishDateSort | 2015 |
| publisher | Marine Research (MA-RE) Institute |
| publisherStr | Marine Research (MA-RE) Institute |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/15723 Assessment of a pond for oyster hatchery development in South Africa Simmons, Aron Jackson, Sue Bolton, John J Applied Marine Science This study assessed a man-made salt-water pond (saltwater pond 1 SP1) as a potential site for the development of an oyster hatchery in Velddrif, South Africa. Over the study period it was observed that the site was not suitable for oyster larvae culture due to the following factors: temperature spikes during the summer months, low dissolved oxygen levels, high salinity levels, and the proliferation of the filamentous green algae (FGA), mainly the sp. Rhizoclonium implexum. Widespread patches of R. implexum were observed within SP1 and increased in biomass over the study period. Biomass patterns were not measured within this study, however microcosm experiments directed at nutrient depletion rates caused by FGA proliferation assessed the effect of the FGA on the system. Within microcosm experiments with and without FGA, nitrite within the system was significantly lower in the FGA inclusion treatment. Pond nutrient dynamics within the system indicated that widespread nutrient depletion occurred between the incoming water and the rest of the pond, and it was clear that the inflow station had significantly higher nutrient concentrations than all the other stations within SP1. Phytoplankton concentrations were extremely low and could be attributed to the FGA dominated state within SP1. Taken together with the fact the water levels within SP1 were not stable, the data suggested that SP1 was not an optimal source of seawater for either algal or larval oyster culture, and an alternative oyster hatchery site should be assessed. 2015-12-09T14:41:52Z 2015-12-09T14:41:52Z 2015 Master Thesis Masters MSc http://hdl.handle.net/11427/15723 eng application/pdf Marine Research (MA-RE) Institute Faculty of Science University of Cape Town |
| spellingShingle | Applied Marine Science Simmons, Aron Assessment of a pond for oyster hatchery development in South Africa |
| thesis_degree_str | Master's |
| title | Assessment of a pond for oyster hatchery development in South Africa |
| title_full | Assessment of a pond for oyster hatchery development in South Africa |
| title_fullStr | Assessment of a pond for oyster hatchery development in South Africa |
| title_full_unstemmed | Assessment of a pond for oyster hatchery development in South Africa |
| title_short | Assessment of a pond for oyster hatchery development in South Africa |
| title_sort | assessment of a pond for oyster hatchery development in south africa |
| topic | Applied Marine Science |
| url | http://hdl.handle.net/11427/15723 |
| work_keys_str_mv | AT simmonsaron assessmentofapondforoysterhatcherydevelopmentinsouthafrica |