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Autoradiographic and electron microscopic study of embryonic nutrition in the teleost, clinus superciliosus
It was established that C. superciliosus is a viviparous teleost. Moreover, breeding occurs throughout the year and the species is characterized by a high incidence of superembryonation, with as many as twelve broods of differing ages developing simultaneously. Autoradiographic studies revealed that...
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| Format: | Thesis |
| Language: | English |
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Department of Biological Sciences
2023
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| _version_ | 1867613186936537088 |
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| access_status_str | Open Access |
| author | Veith, Walter Julius |
| author_browse | Veith, Walter Julius |
| author_facet | Veith, Walter Julius |
| author_sort | Veith, Walter Julius |
| collection | Thesis |
| description | It was established that C. superciliosus is a viviparous teleost. Moreover, breeding occurs throughout the year and the species is characterized by a high incidence of superembryonation, with as many as twelve broods of differing ages developing simultaneously. Autoradiographic studies revealed that the embryo absorbed nutrients through the epidermis initially, but with an increase in embryo-size, there is a shift from epidermal to intestinal absorption of nutrients. Scanning electron microscopy revealed that the epidermal surf ace area is enlarged by the essence of macroridges, which in turn have microvilli and microridges on their free surfaces. The highest incidence of macroridges occurs in the expanded yolk sac and pericardial s ac re ions and the epidermal surface area is at its greatest in embryos 6,8mm long. Thereafter the macroridges gradually disappear and the embryonic surface area is reduced. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/38838 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:32:08.355Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2023 |
| publishDateRange | 2023 |
| publishDateSort | 2023 |
| 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:11427/38838 Autoradiographic and electron microscopic study of embryonic nutrition in the teleost, clinus superciliosus Veith, Walter Julius Zoology It was established that C. superciliosus is a viviparous teleost. Moreover, breeding occurs throughout the year and the species is characterized by a high incidence of superembryonation, with as many as twelve broods of differing ages developing simultaneously. Autoradiographic studies revealed that the embryo absorbed nutrients through the epidermis initially, but with an increase in embryo-size, there is a shift from epidermal to intestinal absorption of nutrients. Scanning electron microscopy revealed that the epidermal surf ace area is enlarged by the essence of macroridges, which in turn have microvilli and microridges on their free surfaces. The highest incidence of macroridges occurs in the expanded yolk sac and pericardial s ac re ions and the epidermal surface area is at its greatest in embryos 6,8mm long. Thereafter the macroridges gradually disappear and the embryonic surface area is reduced. 2023-09-23T16:24:45Z 2023-09-23T16:24:45Z 1978 2023-09-23T16:24:32Z Doctoral Thesis Doctoral PhD http://hdl.handle.net/11427/38838 eng application/pdf Department of Biological Sciences Faculty of Science |
| spellingShingle | Zoology Veith, Walter Julius Autoradiographic and electron microscopic study of embryonic nutrition in the teleost, clinus superciliosus |
| thesis_degree_str | Doctoral |
| title | Autoradiographic and electron microscopic study of embryonic nutrition in the teleost, clinus superciliosus |
| title_full | Autoradiographic and electron microscopic study of embryonic nutrition in the teleost, clinus superciliosus |
| title_fullStr | Autoradiographic and electron microscopic study of embryonic nutrition in the teleost, clinus superciliosus |
| title_full_unstemmed | Autoradiographic and electron microscopic study of embryonic nutrition in the teleost, clinus superciliosus |
| title_short | Autoradiographic and electron microscopic study of embryonic nutrition in the teleost, clinus superciliosus |
| title_sort | autoradiographic and electron microscopic study of embryonic nutrition in the teleost clinus superciliosus |
| topic | Zoology |
| url | http://hdl.handle.net/11427/38838 |
| work_keys_str_mv | AT veithwalterjulius autoradiographicandelectronmicroscopicstudyofembryonicnutritionintheteleostclinussuperciliosus |