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An investigation of protein variation in Ulva lactuca and Ulva rigida under high nitrogen culture conditions
In the light of findings that abalone achieve higher growth rates when fed on high protein diets, this study attempts to increase the protein content of two macroalgae under culture conditions. Ulva lactuca and U rigida were grown in saturating NH₄⁺ - N (1 mM) and PO₄³⁻P (70 μM ) concentrations. Of...
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| Format: | Thesis |
| Language: | English |
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Department of Biological Sciences
2017
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| _version_ | 1867613197462142976 |
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| access_status_str | Open Access |
| author | Wilkinson, Sarah |
| author2 | Bolton, John J |
| author_browse | Bolton, John J Wilkinson, Sarah |
| author_facet | Bolton, John J Wilkinson, Sarah |
| author_sort | Wilkinson, Sarah |
| collection | Thesis |
| description | In the light of findings that abalone achieve higher growth rates when fed on high protein diets, this study attempts to increase the protein content of two macroalgae under culture conditions. Ulva lactuca and U rigida were grown in saturating NH₄⁺ - N (1 mM) and PO₄³⁻P (70 μM ) concentrations. Of the two, protein levels of U. lactuca showed the greatest increase over time. Natural populations had a content of 3.7 % of dry weight. This increased significantly (p <0.05) to a maximum value of 4.5 % after 8 days growth in nutrient enriched conditions. The protein content of U. rigida increased significantly from 3.3 % to 3.9 % after 6 days of growth in nutrient enriched conditions. An interspecies comparison was made using the intertidal species Porphyra capensis, Ulva capensis and Gracilaria gracilis. The highest protein content was found in P. capensis (11.5 %), followed by U capensis (3.0 %) and G. gracilis (2.7 %). Results indicate the suitability of P. capensis as a high-protein abalone fodder. Furthermore, results suggest that the protein content of abalone fodder may be optimized under aquaculture conditions. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/25786 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:32:18.917Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2017 |
| publishDateRange | 2017 |
| publishDateSort | 2017 |
| 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:11427/25786 An investigation of protein variation in Ulva lactuca and Ulva rigida under high nitrogen culture conditions Wilkinson, Sarah Bolton, John J Botany In the light of findings that abalone achieve higher growth rates when fed on high protein diets, this study attempts to increase the protein content of two macroalgae under culture conditions. Ulva lactuca and U rigida were grown in saturating NH₄⁺ - N (1 mM) and PO₄³⁻P (70 μM ) concentrations. Of the two, protein levels of U. lactuca showed the greatest increase over time. Natural populations had a content of 3.7 % of dry weight. This increased significantly (p <0.05) to a maximum value of 4.5 % after 8 days growth in nutrient enriched conditions. The protein content of U. rigida increased significantly from 3.3 % to 3.9 % after 6 days of growth in nutrient enriched conditions. An interspecies comparison was made using the intertidal species Porphyra capensis, Ulva capensis and Gracilaria gracilis. The highest protein content was found in P. capensis (11.5 %), followed by U capensis (3.0 %) and G. gracilis (2.7 %). Results indicate the suitability of P. capensis as a high-protein abalone fodder. Furthermore, results suggest that the protein content of abalone fodder may be optimized under aquaculture conditions. 2017-10-25T08:32:24Z 2017-10-25T08:32:24Z 2001 2017-02-17T08:38:35Z Bachelor Thesis Honours BSc (Hons) http://hdl.handle.net/11427/25786 eng application/pdf Department of Biological Sciences Faculty of Science University of Cape Town |
| spellingShingle | Botany Wilkinson, Sarah An investigation of protein variation in Ulva lactuca and Ulva rigida under high nitrogen culture conditions |
| thesis_degree_str | Bachelor's / Honours |
| title | An investigation of protein variation in Ulva lactuca and Ulva rigida under high nitrogen culture conditions |
| title_full | An investigation of protein variation in Ulva lactuca and Ulva rigida under high nitrogen culture conditions |
| title_fullStr | An investigation of protein variation in Ulva lactuca and Ulva rigida under high nitrogen culture conditions |
| title_full_unstemmed | An investigation of protein variation in Ulva lactuca and Ulva rigida under high nitrogen culture conditions |
| title_short | An investigation of protein variation in Ulva lactuca and Ulva rigida under high nitrogen culture conditions |
| title_sort | investigation of protein variation in ulva lactuca and ulva rigida under high nitrogen culture conditions |
| topic | Botany |
| url | http://hdl.handle.net/11427/25786 |
| work_keys_str_mv | AT wilkinsonsarah aninvestigationofproteinvariationinulvalactucaandulvarigidaunderhighnitrogencultureconditions AT wilkinsonsarah investigationofproteinvariationinulvalactucaandulvarigidaunderhighnitrogencultureconditions |