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Chemosensory properties of different Ulva extracts and their effects on Tripneustes gratilla
Includes bibliographical references.
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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Department of Biological Sciences
2015
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| _version_ | 1867614466995126272 |
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| access_status_str | Open Access |
| author | Du Plessis, Darren Scott |
| author2 | Cyrus, Mark Digby |
| author_browse | Cyrus, Mark Digby Du Plessis, Darren Scott |
| author_facet | Cyrus, Mark Digby Du Plessis, Darren Scott |
| author_sort | Du Plessis, Darren Scott |
| collection | Thesis |
| description | Includes bibliographical references. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/12766 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:52:30.120Z |
| 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 | 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:11427/12766 Chemosensory properties of different Ulva extracts and their effects on Tripneustes gratilla Du Plessis, Darren Scott Cyrus, Mark Digby Bolton, John J Macey, Brett M Aquaculture Includes bibliographical references. Identifying the chemical compounds that attract urchins to seaweeds will increase sea urchin aquaculture efficiency as these compounds can be utilized in the production of artificial feeds enhancing their attractiveness and palatability. This study investigated the chemosensory preferences of the tropical sea urchin Tripneustes gratilla for four crude extracts of Ulva as well as Fresh Ulva and an artificial feed. The four crude extracts of Ulva (Methanolic, Ethanolic, Chloroform and Chloroform-Methanol extracts) were tested by pair-wise chemosensory trials in a Y shaped maze. Urchins were significantly deterred by both the Chloroform and Chloroform- Methanol extracts as well as the solvent controls and artificial feed, however T. gratilla was significantly attracted to both the Methanolic and Ethanolic extracts. These two extracts were tested individually against Ulva and the urchins could not distinguish between Ulva and the extracts. When these two extracts were tested against one another it was found that the urchins were significantly attracted to the Methanolic extract. The Methanolic extract was then added to the artificial feed and significantly improved the feeds attractability. This indicates that these extracts, or the compounds which are responsible for this effect, can be incorporated into artificial feeds thereby making them more attractive to the sea urchin. The percentage yield of Ulva that each solvent extracted was different, although only the Ethanolic extract was found to be significantly different from the Chloroform and Chloroform-Methanol extracts. Future studies are needed to examine the chemical composition of these specific chemosensory compounds. By incorporating these attractive extracts into artificial feeds, South Africa can potentially improve the cultivation success of T. gratilla therefore expanding the economy of the local aquaculture industry through the export of this highly valued seafood product. 2015-05-06T14:23:29Z 2015-05-06T14:23:29Z 2014 Bachelor Thesis Honours BSc (Hons) http://hdl.handle.net/11427/12766 eng application/pdf Department of Biological Sciences Faculty of Science University of Cape Town |
| spellingShingle | Aquaculture Du Plessis, Darren Scott Chemosensory properties of different Ulva extracts and their effects on Tripneustes gratilla |
| thesis_degree_str | Bachelor's / Honours |
| title | Chemosensory properties of different Ulva extracts and their effects on Tripneustes gratilla |
| title_full | Chemosensory properties of different Ulva extracts and their effects on Tripneustes gratilla |
| title_fullStr | Chemosensory properties of different Ulva extracts and their effects on Tripneustes gratilla |
| title_full_unstemmed | Chemosensory properties of different Ulva extracts and their effects on Tripneustes gratilla |
| title_short | Chemosensory properties of different Ulva extracts and their effects on Tripneustes gratilla |
| title_sort | chemosensory properties of different ulva extracts and their effects on tripneustes gratilla |
| topic | Aquaculture |
| url | http://hdl.handle.net/11427/12766 |
| work_keys_str_mv | AT duplessisdarrenscott chemosensorypropertiesofdifferentulvaextractsandtheireffectsontripneustesgratilla |