Apartheid debt - The pension component
- AIDC
- Authors: AIDC
- Date: 1996
- Subjects: Alternative Information & Development Centre (AIDC)
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/114703 , vital:34015
- Description: The Alternative Information and Development Centre (AIDC) and the NGO Coalition have called upon the new democratic government of South Africa not to pay the apartheid debt, incurred by the previous regime. The Reconstruction and Development Programme is suffering under the weight of interest payments on the debts made by the apartheid regime. Our organisations have argued that this debt is an odious debt incurred in the process of maintaining the system of apartheid. While major organisations of civil society have shown great interest in this issue, business and government circles . have been sceptical. A consistent concern has been raised in relation to the impact of debt cancellation for state pension holders.
- Full Text:
- Date Issued: 1996
- Authors: AIDC
- Date: 1996
- Subjects: Alternative Information & Development Centre (AIDC)
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/114703 , vital:34015
- Description: The Alternative Information and Development Centre (AIDC) and the NGO Coalition have called upon the new democratic government of South Africa not to pay the apartheid debt, incurred by the previous regime. The Reconstruction and Development Programme is suffering under the weight of interest payments on the debts made by the apartheid regime. Our organisations have argued that this debt is an odious debt incurred in the process of maintaining the system of apartheid. While major organisations of civil society have shown great interest in this issue, business and government circles . have been sceptical. A consistent concern has been raised in relation to the impact of debt cancellation for state pension holders.
- Full Text:
- Date Issued: 1996
Arbor day
- Date: 1996
- Subjects: Rhodes University -- History , Rhodes University -- Employees , Arbor Day -- South Africa -- Grahamstown
- Type: still image
- Identifier: http://hdl.handle.net/10962/52026 , vital:26150 , PIC/M 7421 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017.
- Full Text: false
- Date Issued: 1996
- Date: 1996
- Subjects: Rhodes University -- History , Rhodes University -- Employees , Arbor Day -- South Africa -- Grahamstown
- Type: still image
- Identifier: http://hdl.handle.net/10962/52026 , vital:26150 , PIC/M 7421 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017.
- Full Text: false
- Date Issued: 1996
Arbor day
- Date: 1996
- Subjects: Rhodes University -- History , Rhodes University -- Employees , Arbor Day -- South Africa -- Grahamstown
- Type: still image
- Identifier: http://hdl.handle.net/10962/52039 , vital:26151 , PIC/M 7422 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017.
- Full Text: false
- Date Issued: 1996
- Date: 1996
- Subjects: Rhodes University -- History , Rhodes University -- Employees , Arbor Day -- South Africa -- Grahamstown
- Type: still image
- Identifier: http://hdl.handle.net/10962/52039 , vital:26151 , PIC/M 7422 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017.
- Full Text: false
- Date Issued: 1996
Arbor day (Picture 2)
- Date: 1996
- Subjects: Rhodes University -- History , Rhodes University -- Employees , Arbor Day -- South Africa -- Grahamstown
- Type: still image
- Identifier: http://hdl.handle.net/10962/51954 , vital:26142 , PIC/M 7417 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017.
- Full Text: false
- Date Issued: 1996
- Date: 1996
- Subjects: Rhodes University -- History , Rhodes University -- Employees , Arbor Day -- South Africa -- Grahamstown
- Type: still image
- Identifier: http://hdl.handle.net/10962/51954 , vital:26142 , PIC/M 7417 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017.
- Full Text: false
- Date Issued: 1996
Arbor day (Picture 2)
- Date: 1996
- Subjects: Rhodes University -- History , Rhodes University -- Employees , Arbor Day -- South Africa -- Grahamstown
- Type: still image
- Identifier: http://hdl.handle.net/10962/51967 , vital:26144 , PIC/M 7418 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017.
- Full Text: false
- Date Issued: 1996
- Date: 1996
- Subjects: Rhodes University -- History , Rhodes University -- Employees , Arbor Day -- South Africa -- Grahamstown
- Type: still image
- Identifier: http://hdl.handle.net/10962/51967 , vital:26144 , PIC/M 7418 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017.
- Full Text: false
- Date Issued: 1996
Arbor day (Picture 2)
- Date: 1996
- Subjects: Rhodes University -- History , Rhodes University -- Employees , Arbor Day -- South Africa -- Grahamstown
- Type: still image
- Identifier: http://hdl.handle.net/10962/51935 , vital:26141 , PIC/M 7416 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017.
- Full Text: false
- Date Issued: 1996
- Date: 1996
- Subjects: Rhodes University -- History , Rhodes University -- Employees , Arbor Day -- South Africa -- Grahamstown
- Type: still image
- Identifier: http://hdl.handle.net/10962/51935 , vital:26141 , PIC/M 7416 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017.
- Full Text: false
- Date Issued: 1996
Arbor day - Eddie baart (4th from left) Len Paton 4th from left back)
- Date: 1996
- Subjects: Rhodes University -- History , Rhodes University -- Employees , Arbor Day -- South Africa -- Grahamstown
- Type: still image
- Identifier: http://hdl.handle.net/10962/52426 , vital:26189 , PIC/M 7411 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017.
- Full Text: false
- Date Issued: 1996
- Date: 1996
- Subjects: Rhodes University -- History , Rhodes University -- Employees , Arbor Day -- South Africa -- Grahamstown
- Type: still image
- Identifier: http://hdl.handle.net/10962/52426 , vital:26189 , PIC/M 7411 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017.
- Full Text: false
- Date Issued: 1996
Arbor day 001 - Eddie baart (4th from left) Len Paton 4th from left back)
- Date: 1996
- Subjects: Rhodes University -- History , Rhodes University -- Employees , Arbor Day -- South Africa -- Grahamstown
- Type: still image
- Identifier: http://hdl.handle.net/10962/51491 , vital:26099 , PIC/M 7411 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017.
- Full Text: false
- Date Issued: 1996
- Date: 1996
- Subjects: Rhodes University -- History , Rhodes University -- Employees , Arbor Day -- South Africa -- Grahamstown
- Type: still image
- Identifier: http://hdl.handle.net/10962/51491 , vital:26099 , PIC/M 7411 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017.
- Full Text: false
- Date Issued: 1996
Arbor day 002 Mark hazel left and Dave Woods
- Date: 1996
- Subjects: Rhodes University -- History , Rhodes University -- Employees , Arbor Day -- South Africa -- Grahamstown
- Type: still image
- Identifier: http://hdl.handle.net/10962/51508 , vital:26102 , PIC/M 7412 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017.
- Full Text: false
- Date Issued: 1996
- Date: 1996
- Subjects: Rhodes University -- History , Rhodes University -- Employees , Arbor Day -- South Africa -- Grahamstown
- Type: still image
- Identifier: http://hdl.handle.net/10962/51508 , vital:26102 , PIC/M 7412 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017.
- Full Text: false
- Date Issued: 1996
Arbor day 003 (Picture 1)
- Date: 1996
- Subjects: Rhodes University -- History , Rhodes University -- Employees , Arbor Day -- South Africa -- Grahamstown
- Type: still image
- Identifier: http://hdl.handle.net/10962/51527 , vital:26105 , PIC/M 7413 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017.
- Full Text: false
- Date Issued: 1996
- Date: 1996
- Subjects: Rhodes University -- History , Rhodes University -- Employees , Arbor Day -- South Africa -- Grahamstown
- Type: still image
- Identifier: http://hdl.handle.net/10962/51527 , vital:26105 , PIC/M 7413 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017.
- Full Text: false
- Date Issued: 1996
Arbor day 004 (Picture 1)
- Date: 1996
- Subjects: Rhodes University -- History , Rhodes University -- Employees , Arbor Day -- South Africa -- Grahamstown
- Type: still image
- Identifier: http://hdl.handle.net/10962/51572 , vital:26108 , PIC/M 7414 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017.
- Full Text: false
- Date Issued: 1996
- Date: 1996
- Subjects: Rhodes University -- History , Rhodes University -- Employees , Arbor Day -- South Africa -- Grahamstown
- Type: still image
- Identifier: http://hdl.handle.net/10962/51572 , vital:26108 , PIC/M 7414 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017.
- Full Text: false
- Date Issued: 1996
Arbor day 005 (Picture 3) Don Maclennan
- Date: 1996
- Subjects: Rhodes University -- History , Rhodes University -- Employees , Arbor Day -- South Africa -- Grahamstown
- Type: still image
- Identifier: http://hdl.handle.net/10962/51612 , vital:26112 , PIC/M 7415 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017.
- Full Text: false
- Date Issued: 1996
- Date: 1996
- Subjects: Rhodes University -- History , Rhodes University -- Employees , Arbor Day -- South Africa -- Grahamstown
- Type: still image
- Identifier: http://hdl.handle.net/10962/51612 , vital:26112 , PIC/M 7415 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017.
- Full Text: false
- Date Issued: 1996
Arbor day Derek henderson and Bruce Smith
- Date: 1996
- Subjects: Rhodes University -- History , Rhodes University -- Employees , Arbor Day -- South Africa -- Grahamstown
- Type: still image
- Identifier: http://hdl.handle.net/10962/51985 , vital:26146 , PIC/M 7419 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017.
- Full Text: false
- Date Issued: 1996
- Date: 1996
- Subjects: Rhodes University -- History , Rhodes University -- Employees , Arbor Day -- South Africa -- Grahamstown
- Type: still image
- Identifier: http://hdl.handle.net/10962/51985 , vital:26146 , PIC/M 7419 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017.
- Full Text: false
- Date Issued: 1996
Arbor day Derek Woods
- Date: 1996
- Subjects: Rhodes University -- History , Rhodes University -- Employees , Arbor Day -- South Africa -- Grahamstown
- Type: still image
- Identifier: http://hdl.handle.net/10962/52012 , vital:26148 , PIC/M 7420 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017.
- Full Text: false
- Date Issued: 1996
- Date: 1996
- Subjects: Rhodes University -- History , Rhodes University -- Employees , Arbor Day -- South Africa -- Grahamstown
- Type: still image
- Identifier: http://hdl.handle.net/10962/52012 , vital:26148 , PIC/M 7420 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017.
- Full Text: false
- Date Issued: 1996
Arbor Day tree planting
- Date: 1996
- Subjects: Rhodes University -- History , Rhodes University -- Employees , Arbor Day -- South Africa -- Grahamstown
- Type: still image
- Identifier: http://hdl.handle.net/10962/51646 , vital:26114 , PIC/M 7411 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017.
- Full Text: false
- Date Issued: 1996
- Date: 1996
- Subjects: Rhodes University -- History , Rhodes University -- Employees , Arbor Day -- South Africa -- Grahamstown
- Type: still image
- Identifier: http://hdl.handle.net/10962/51646 , vital:26114 , PIC/M 7411 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017.
- Full Text: false
- Date Issued: 1996
Architecture and landscape design : an investigation into the harmonising of these two aspects of design as exemplified by the collaboration of Gertrude Jekyll and Sir Edwin Landseer Lutyens
- Authors: Judge, Stephen Michael
- Date: 1996
- Subjects: Lutyens, Edwin Landseer, Sir, 1869-1944 Jekyll, Gertrude, 1843-1932 Gardens -- Design Architecture, British
- Language: English
- Type: Thesis , Masters , MFA
- Identifier: vital:2405 , http://hdl.handle.net/10962/d1002201
- Description: Sir Edwin Lutyens and Miss Gertrude Jekyll were part of the 'Art's and Crafts' movement, which advocated the use of local techniques and materials. They grew up separately, both in the Surrey country-side and both among creative people. Jekyll later worked with Edward Hudson (the author of 'Country Life') who persuaded her to be a garden designer . Lutyens was inspired first by the architecture of Surrey (mostly that of Norman Shaw), then by his friend, Herbert Baker, at architectural school, and lastly, by his long - time partner Jekyll. Munstead Wood, Surrey, England, was the partners' first project and it embodies nearly all of their ideals; the natural and indigenous use of flowers and plants, with an ordered colour scheme ; graded colour schemes without discord; the use of entirely local materials ; the sole use of local craftsmen and local techniques; a garden of 'rooms'; the intergration of architecture and garden design. A revival of interest in the partners work has helped to recreate some of the lost gardens of Jekyll. This interest has in turn put a spotlight on the ideals employed by the partners. Their wide influence has also produced many great buildings and gardens, most notably through the work of Sir Herbert Baker in South Africa. The Union Buildings are a perfect example of Baker's work, and much of it has the stamp of Lutyens' style and ideals. Through my own interest in Lutyens and Jekyll I have created my own Jekyll-style border in Grahamstown, Eastern Cape, to try and prove that her ideals can be translated into climates other than that of England. In this experiment, I succeeded in using indigenous South African plants and flowers with a colour scheme in the style of Jekyll, proving that the ideals to which she aspired could be applied in other countries.
- Full Text:
- Date Issued: 1996
- Authors: Judge, Stephen Michael
- Date: 1996
- Subjects: Lutyens, Edwin Landseer, Sir, 1869-1944 Jekyll, Gertrude, 1843-1932 Gardens -- Design Architecture, British
- Language: English
- Type: Thesis , Masters , MFA
- Identifier: vital:2405 , http://hdl.handle.net/10962/d1002201
- Description: Sir Edwin Lutyens and Miss Gertrude Jekyll were part of the 'Art's and Crafts' movement, which advocated the use of local techniques and materials. They grew up separately, both in the Surrey country-side and both among creative people. Jekyll later worked with Edward Hudson (the author of 'Country Life') who persuaded her to be a garden designer . Lutyens was inspired first by the architecture of Surrey (mostly that of Norman Shaw), then by his friend, Herbert Baker, at architectural school, and lastly, by his long - time partner Jekyll. Munstead Wood, Surrey, England, was the partners' first project and it embodies nearly all of their ideals; the natural and indigenous use of flowers and plants, with an ordered colour scheme ; graded colour schemes without discord; the use of entirely local materials ; the sole use of local craftsmen and local techniques; a garden of 'rooms'; the intergration of architecture and garden design. A revival of interest in the partners work has helped to recreate some of the lost gardens of Jekyll. This interest has in turn put a spotlight on the ideals employed by the partners. Their wide influence has also produced many great buildings and gardens, most notably through the work of Sir Herbert Baker in South Africa. The Union Buildings are a perfect example of Baker's work, and much of it has the stamp of Lutyens' style and ideals. Through my own interest in Lutyens and Jekyll I have created my own Jekyll-style border in Grahamstown, Eastern Cape, to try and prove that her ideals can be translated into climates other than that of England. In this experiment, I succeeded in using indigenous South African plants and flowers with a colour scheme in the style of Jekyll, proving that the ideals to which she aspired could be applied in other countries.
- Full Text:
- Date Issued: 1996
Asleep in a glass coffin: fairy tales as illuminating attitudes to women in the novels of Charles Dickens
- Authors: Daly, Robyn Anne
- Date: 1996
- Subjects: Dickens, Charles, 1812-1870 -- Criticism and interpretation Dickens, Charles, 1812-1870 -- Folklore Dickens, Charles, 1812-1870 -- Characters Women Dickens, Charles, 1812-1870 -- Symbolism Fairy tales -- History and criticism
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2227 , http://hdl.handle.net/10962/d1002270
- Description: The field of research of this thesis covers three main areas: the novels of Charles Dickens; fairy tales and storytelling; and notions of women as reflected in feminist literary theory. A reading of selected novels by Dickens provides the primary source. That he copiously drew on fairy tales has been explored in such notable works as Harry Stone's, but the thesis concentrates on Dickens 's propensity in his creation of female protagonists to give them a voice which is vivified through fairy tale. The analysis of fairy story through narrative theory and feminist literary theory functions as the basis of an exploration of the role female narrative voices play in a reading of the novels which reveals a more sympathetic vision of the feminine than has been observed hitherto. The context of this study is Victorian attitudes to women and that modem criticism has not sufficiently acknowledged Dickens's insight into of the condition of women; much of this is discovered through an examination of his use of fairy tale wherein the woman is bearer of imaginative and emotional capacities magically bestowed. The research aims to counter the view of Dickens's novels as being sexist, through the iIluminatory characteristics of fairy tale. Dickens activates his women characters by means of their often being tellers of tales replete with fairy tale imagery, and their tales are almost always seminal to the novelist's moral purpose.
- Full Text:
- Date Issued: 1996
- Authors: Daly, Robyn Anne
- Date: 1996
- Subjects: Dickens, Charles, 1812-1870 -- Criticism and interpretation Dickens, Charles, 1812-1870 -- Folklore Dickens, Charles, 1812-1870 -- Characters Women Dickens, Charles, 1812-1870 -- Symbolism Fairy tales -- History and criticism
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2227 , http://hdl.handle.net/10962/d1002270
- Description: The field of research of this thesis covers three main areas: the novels of Charles Dickens; fairy tales and storytelling; and notions of women as reflected in feminist literary theory. A reading of selected novels by Dickens provides the primary source. That he copiously drew on fairy tales has been explored in such notable works as Harry Stone's, but the thesis concentrates on Dickens 's propensity in his creation of female protagonists to give them a voice which is vivified through fairy tale. The analysis of fairy story through narrative theory and feminist literary theory functions as the basis of an exploration of the role female narrative voices play in a reading of the novels which reveals a more sympathetic vision of the feminine than has been observed hitherto. The context of this study is Victorian attitudes to women and that modem criticism has not sufficiently acknowledged Dickens's insight into of the condition of women; much of this is discovered through an examination of his use of fairy tale wherein the woman is bearer of imaginative and emotional capacities magically bestowed. The research aims to counter the view of Dickens's novels as being sexist, through the iIluminatory characteristics of fairy tale. Dickens activates his women characters by means of their often being tellers of tales replete with fairy tale imagery, and their tales are almost always seminal to the novelist's moral purpose.
- Full Text:
- Date Issued: 1996
Aspects of nutrition of the swordtail fish, Xiphophorus Helleri, (Family : Poeciliidae) under intensive culture conditions
- Authors: Kruger, David Philip
- Date: 1996
- Subjects: Xiphophorus helleri -- Nutrition , Fish culture
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5219 , http://hdl.handle.net/10962/d1005062 , Xiphophorus helleri -- Nutrition , Fish culture
- Description: The aim of this work was to investigate the nutrition of a popular ornamental fish, the swordtail (Xiphophorus helleri), under intensive aquaculture conditions. The study focused on the formulation and manufacture of artificial dry diets, as well as the influence of livefeed supplementation on growth and nutritional indices of both juvenile and broodstock fish. A combination of 65% fishmeal and 35% soya oil cake meal was found to closely approximate the essential amino acid profile of X helleri (r² = 94,3%) and lysine was identified as the first limiting amino acid. The influence of dietary protein and energy on the growth of X helleri was investigated by means of a growth trial comparing a range of nine test diets combining 3 crude protein (45,38 and 30%) and 3 digestible energy (16,5, 14,5 and 12,5 kJ/gram) levels. A high crude protein content (45% dry matter) and a protein to energy ratio of ≥ 27 mg protein per kJ digestible energy was shown to promote optimal growth rate and feed conversion ratio in juvenile X helleri. The final body protein and lipid content of the fish were significantly correlated with the dietary protein to energy ratio. The nutritional value of identical dietary formulations prepared by drum-drying or cold extrusion techniques and presented either as flake or crumble particles was evaluated in a growth trial and through analysis of vitamin C levels in the diets. Up to 27% of vitamin C activity was destroyed during the drum-drying of flake diets, while 80% of the remaining vitamin C was lost through leaching within 10 minutes of immersion in water. A crumble-type diet was shown to be acceptable to X helleri, and yielded significantly better growth rate and feed conversion than the equivalent flake feed. Almost 19% of fish fed the flake diets developed vitamin C deficiency symptoms including scoliosis and lordosis, while this was completely prevented by feeding crumbles, indicating a significant restriction of leaching losses from this type of particle. The use of livefeed (Daphnia spp.) as a daily supplement to dry feeds was shown to result in a significant improvement in growth rate and survival of juvenile swordtail fish. Furthermore, the synergistic action of nutrients contained in the livefeed resulted in an improvement in the feed conversion efficiency of the artificial formulation. While mortalities of 13,4% and 15% were recorded in fish fed exclusively on flake feed or Daphnia, no mortality occurred in the group fed the supplemented diet. Furthermore, the incidence of vitamin C deficiency symptoms was prevented by daily supplementation with Daphnia. Fish fed exclusively on Daphnia exhibited significantly more intense pigmentation due to carotenoids contained in the livefeed. In broodstock fish maintained primarily on flake diets, growth rate, feed conversion ratio as well as reproductive performance, as measured by fecundity, were significantly improved by daily livefeed supplementation. Weekly supplementation showed no measurable advantage over flake feed only. A direct correlation was demonstrated between fecundity and size of female fish with a mean fecundity of 190 embryos per female in those fed a daily Daphnia supplement. This was significantly higher than the yield from the non-supplemented or weekly supplemented treatments (133 and 140 embryos per female respectively). Despite these differences, the number of young harvested during the experiment did not differ between treatments and this discrepancy was ascribed to parental cannibalism of newborn juveniles. This phenomenon constitutes a major potential bottleneck in production with estimates of up to seventy percent of young lost in some exp experimental tanks. In conclusion, the present study demonstrated that established aquaculture nutrition principles and techniques are applicable to the tropical ornamental fish species, X helleri. It was demonstrated that by using balanced crumble feed formulations, and regular livefeed supplementation, production yields under intensive conditions may be significantly improved. Suggestions for future work on poeciliid production in South Africa include investigation of the economic implications of the recommendations stemming from this project, and further research into effective restriction of parental cannibalism of newborn fish.
- Full Text:
- Date Issued: 1996
- Authors: Kruger, David Philip
- Date: 1996
- Subjects: Xiphophorus helleri -- Nutrition , Fish culture
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5219 , http://hdl.handle.net/10962/d1005062 , Xiphophorus helleri -- Nutrition , Fish culture
- Description: The aim of this work was to investigate the nutrition of a popular ornamental fish, the swordtail (Xiphophorus helleri), under intensive aquaculture conditions. The study focused on the formulation and manufacture of artificial dry diets, as well as the influence of livefeed supplementation on growth and nutritional indices of both juvenile and broodstock fish. A combination of 65% fishmeal and 35% soya oil cake meal was found to closely approximate the essential amino acid profile of X helleri (r² = 94,3%) and lysine was identified as the first limiting amino acid. The influence of dietary protein and energy on the growth of X helleri was investigated by means of a growth trial comparing a range of nine test diets combining 3 crude protein (45,38 and 30%) and 3 digestible energy (16,5, 14,5 and 12,5 kJ/gram) levels. A high crude protein content (45% dry matter) and a protein to energy ratio of ≥ 27 mg protein per kJ digestible energy was shown to promote optimal growth rate and feed conversion ratio in juvenile X helleri. The final body protein and lipid content of the fish were significantly correlated with the dietary protein to energy ratio. The nutritional value of identical dietary formulations prepared by drum-drying or cold extrusion techniques and presented either as flake or crumble particles was evaluated in a growth trial and through analysis of vitamin C levels in the diets. Up to 27% of vitamin C activity was destroyed during the drum-drying of flake diets, while 80% of the remaining vitamin C was lost through leaching within 10 minutes of immersion in water. A crumble-type diet was shown to be acceptable to X helleri, and yielded significantly better growth rate and feed conversion than the equivalent flake feed. Almost 19% of fish fed the flake diets developed vitamin C deficiency symptoms including scoliosis and lordosis, while this was completely prevented by feeding crumbles, indicating a significant restriction of leaching losses from this type of particle. The use of livefeed (Daphnia spp.) as a daily supplement to dry feeds was shown to result in a significant improvement in growth rate and survival of juvenile swordtail fish. Furthermore, the synergistic action of nutrients contained in the livefeed resulted in an improvement in the feed conversion efficiency of the artificial formulation. While mortalities of 13,4% and 15% were recorded in fish fed exclusively on flake feed or Daphnia, no mortality occurred in the group fed the supplemented diet. Furthermore, the incidence of vitamin C deficiency symptoms was prevented by daily supplementation with Daphnia. Fish fed exclusively on Daphnia exhibited significantly more intense pigmentation due to carotenoids contained in the livefeed. In broodstock fish maintained primarily on flake diets, growth rate, feed conversion ratio as well as reproductive performance, as measured by fecundity, were significantly improved by daily livefeed supplementation. Weekly supplementation showed no measurable advantage over flake feed only. A direct correlation was demonstrated between fecundity and size of female fish with a mean fecundity of 190 embryos per female in those fed a daily Daphnia supplement. This was significantly higher than the yield from the non-supplemented or weekly supplemented treatments (133 and 140 embryos per female respectively). Despite these differences, the number of young harvested during the experiment did not differ between treatments and this discrepancy was ascribed to parental cannibalism of newborn juveniles. This phenomenon constitutes a major potential bottleneck in production with estimates of up to seventy percent of young lost in some exp experimental tanks. In conclusion, the present study demonstrated that established aquaculture nutrition principles and techniques are applicable to the tropical ornamental fish species, X helleri. It was demonstrated that by using balanced crumble feed formulations, and regular livefeed supplementation, production yields under intensive conditions may be significantly improved. Suggestions for future work on poeciliid production in South Africa include investigation of the economic implications of the recommendations stemming from this project, and further research into effective restriction of parental cannibalism of newborn fish.
- Full Text:
- Date Issued: 1996
Aspects of the physiology of the South African abalone, Haliotis Midae L., and implications for intensive abalone culture
- Authors: Lyon, Robert Gary
- Date: 1996
- Subjects: Abalones -- Physiology , Abalone culture
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5226 , http://hdl.handle.net/10962/d1005069 , Abalones -- Physiology , Abalone culture
- Description: A physiological study was carried out to determine the effects of temperature, quantity of food fed, feeding activity and size class on the oxygen consumption and ammonia production of the South African abalone Haliotis midae L.. A set of intermittent flow respirometer chambers were used in a recirculating system to measure the oxygen consumption rates of fed (postprandial) and unfed (postabsorptive) abalone for three different size classes (15, 30, and 50mm) at three different temperatures (16°, 20° and 23°C) over a 24 hour period. Ammonia production rates and food consumption rates were simultaneously determined. Oxygen consumption and Ammonia production rates per gram abalone were linear functions of abalone size, temperature, and mass of food consumed. Oxygen consumption and ammonia production rates were found to increase proportionally to temperature and in inverse proportion to abalone size. These rates were significantly higher for fed as opposed to unfed abalone. Equations were derived to predict oxygen consumption and ammonia production for fed and unfed animals for a range of temperatures and size classes of abalone. A 96h LC50 lethal toxicity test for exposure to ammonia established 1.08mg.1⁻¹ of unionised ammonia as the lethal limit. A test on the long term effects on growth of acute exposure (12h) to various sublethal concentrations of ammonia showed no significant effects on growth for concentrations below 0.88 mg.1⁻¹. A safe chronic exposure level of 0.02 mg.1¹ NH₃-N was used to predict optimal flow rates required per kilogram of abalone in a rearing tank over a range of size classes and temperatures. The physiological and biological requirements of H. midae and the implications of this knowledge for rearing tank management and optimal design are discussed.
- Full Text:
- Date Issued: 1996
- Authors: Lyon, Robert Gary
- Date: 1996
- Subjects: Abalones -- Physiology , Abalone culture
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5226 , http://hdl.handle.net/10962/d1005069 , Abalones -- Physiology , Abalone culture
- Description: A physiological study was carried out to determine the effects of temperature, quantity of food fed, feeding activity and size class on the oxygen consumption and ammonia production of the South African abalone Haliotis midae L.. A set of intermittent flow respirometer chambers were used in a recirculating system to measure the oxygen consumption rates of fed (postprandial) and unfed (postabsorptive) abalone for three different size classes (15, 30, and 50mm) at three different temperatures (16°, 20° and 23°C) over a 24 hour period. Ammonia production rates and food consumption rates were simultaneously determined. Oxygen consumption and Ammonia production rates per gram abalone were linear functions of abalone size, temperature, and mass of food consumed. Oxygen consumption and ammonia production rates were found to increase proportionally to temperature and in inverse proportion to abalone size. These rates were significantly higher for fed as opposed to unfed abalone. Equations were derived to predict oxygen consumption and ammonia production for fed and unfed animals for a range of temperatures and size classes of abalone. A 96h LC50 lethal toxicity test for exposure to ammonia established 1.08mg.1⁻¹ of unionised ammonia as the lethal limit. A test on the long term effects on growth of acute exposure (12h) to various sublethal concentrations of ammonia showed no significant effects on growth for concentrations below 0.88 mg.1⁻¹. A safe chronic exposure level of 0.02 mg.1¹ NH₃-N was used to predict optimal flow rates required per kilogram of abalone in a rearing tank over a range of size classes and temperatures. The physiological and biological requirements of H. midae and the implications of this knowledge for rearing tank management and optimal design are discussed.
- Full Text:
- Date Issued: 1996
Basin analysis and sequence stratigraphy a review, with a short account of its applicability and utility for the exploration of auriferous placers in the Witwatersrand Basin
- Authors: Van Eeden, Johan
- Date: 1996
- Subjects: Geology, Stratigraphic , Sedimentary basins -- South Africa , Placer deposits -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4934 , http://hdl.handle.net/10962/d1005546 , Geology, Stratigraphic , Sedimentary basins -- South Africa , Placer deposits -- South Africa
- Description: The Witwatersrand basin is unique in terms of its mineral wealth. The gold in the Witwatersrand basin is mainly concentrated in the placers and two types of unconformities are associated with the placer formation. This paper attempts to quantitatively describe the origin and depositional process of placers within the context of basin analysis, geohistory and sequences stratigraphic framework. Several tectonic models have been proposed for the evolution of the Witwater~rand basin and it seems as if a cratonic foreland basin accounts for many of the observed features observed the Central Rand Group basin. The tectonic subsidence curve generated for the Witwatersrand Basin clearly implies foreland basin response which was superimposed an older, deep seated extensional basin. These compressive tectonics can be superimposed on extensional basins, where the shift from extensional to compressional tectonics lead to inversion processes. The critical issues about the Witwatersrand basin which were addresed in this review, is the validity of basin wide correlation of placer unconformuties and whether sequence stratigraphy is applicable to fluvial systems of the Witwatersrand sequence. It is believed that the Central Rand Group was deposited as alluvial - fan deltas by fluvially dominated, braidplain systems with minor marine interaction which had a considerable impact on the preservation of economically viable placers. Most important to the exploration geologist is the recognition of stacking patterns of the fluvial strata to determine change in the rate at which accommodation was created. Identifying sequence boundaries and other relevant surfaces important for identifying these stacking patterns of the sequences, depends entirely on the recognition of a hierarchy of stratal units including beds, bedsets, parasequences, parasequence sets and the surfaces bounding sequences. Placers are closely associated with the development of disconformities and therefore become important to recognise in fluvial strata. If these placers are to become economic, the duration of subaerial exposure of the unconformities that allowed the placers to become reworked and concentrated must be determined. In order to preserve the placer, a sudden marine transgression is necessary to allow for minimal shoreline reworking and to cap the placer to prevent it from being dispersed. The placers in the Witwatersrand basin occur in four major gold-bearing placer zones in the Central Rand Group. Accordingly they can be assigned to four supercycles, which are cyclical and therefore predictive. It is the predictive nature of these rocks and the ability of sequence stratigraphy to enhance this aspect, which is a pre-requisite for an effective exploration tool in the search for new ore bodies or their extension in the Witwatersrand basin.
- Full Text:
- Date Issued: 1996
- Authors: Van Eeden, Johan
- Date: 1996
- Subjects: Geology, Stratigraphic , Sedimentary basins -- South Africa , Placer deposits -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4934 , http://hdl.handle.net/10962/d1005546 , Geology, Stratigraphic , Sedimentary basins -- South Africa , Placer deposits -- South Africa
- Description: The Witwatersrand basin is unique in terms of its mineral wealth. The gold in the Witwatersrand basin is mainly concentrated in the placers and two types of unconformities are associated with the placer formation. This paper attempts to quantitatively describe the origin and depositional process of placers within the context of basin analysis, geohistory and sequences stratigraphic framework. Several tectonic models have been proposed for the evolution of the Witwater~rand basin and it seems as if a cratonic foreland basin accounts for many of the observed features observed the Central Rand Group basin. The tectonic subsidence curve generated for the Witwatersrand Basin clearly implies foreland basin response which was superimposed an older, deep seated extensional basin. These compressive tectonics can be superimposed on extensional basins, where the shift from extensional to compressional tectonics lead to inversion processes. The critical issues about the Witwatersrand basin which were addresed in this review, is the validity of basin wide correlation of placer unconformuties and whether sequence stratigraphy is applicable to fluvial systems of the Witwatersrand sequence. It is believed that the Central Rand Group was deposited as alluvial - fan deltas by fluvially dominated, braidplain systems with minor marine interaction which had a considerable impact on the preservation of economically viable placers. Most important to the exploration geologist is the recognition of stacking patterns of the fluvial strata to determine change in the rate at which accommodation was created. Identifying sequence boundaries and other relevant surfaces important for identifying these stacking patterns of the sequences, depends entirely on the recognition of a hierarchy of stratal units including beds, bedsets, parasequences, parasequence sets and the surfaces bounding sequences. Placers are closely associated with the development of disconformities and therefore become important to recognise in fluvial strata. If these placers are to become economic, the duration of subaerial exposure of the unconformities that allowed the placers to become reworked and concentrated must be determined. In order to preserve the placer, a sudden marine transgression is necessary to allow for minimal shoreline reworking and to cap the placer to prevent it from being dispersed. The placers in the Witwatersrand basin occur in four major gold-bearing placer zones in the Central Rand Group. Accordingly they can be assigned to four supercycles, which are cyclical and therefore predictive. It is the predictive nature of these rocks and the ability of sequence stratigraphy to enhance this aspect, which is a pre-requisite for an effective exploration tool in the search for new ore bodies or their extension in the Witwatersrand basin.
- Full Text:
- Date Issued: 1996