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A cybersecurity curricular framework for IT undergraduates in South Africa

  • Authors: Mbuqe, Apelele Alungile
  • Date: 2020
  • Subjects: LCSH
  • Language: English
  • Type: Thesis , Masters , MIT
  • Identifier: http://hdl.handle.net/10948/49595 , vital:41739
  • Description: Abstract ending in a full stop.
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A five year comparative analysis of annual baseline neurocognitive test scores for South African high school athletes

  • Authors: Reichling, Marcelle Antoinette
  • Date: 2020
  • Subjects: High school athletes -- Intelligence testing , Sports -- Psychological aspects , Neuropsychological tests , Brain -- Wounds and injuries -- Psychology , Sports injuries -- Psychological aspects , Brain -- Concussion , Head -- Wounds and injuries
  • Language: English
  • Type: text , Thesis , Masters , MA
  • Identifier: http://hdl.handle.net/10962/145863 , vital:38473
  • Description: The primary objective of this study was to assess the pattern of change in neurocognitive performance for adolescent athletes on baseline measures of the Immediate Post Concussion Assessment and Cognitive Testing (ImPACT) test, over five consecutive years, with a view to providing an indication of the optimal interval for repeat baseline testing of high school athletes. Participants were non-clinical, predominantly South African high school athletes in the overall age range 13 to 18 years (N = 108), divided into five groups (Grades 8,9, 10, 11 and 12), and tested at five test intervals. Repeated-measures ANOVA analyses examined differences in score performance across the test intervals for each of the five composite scores of the ImPACT test (Verbal Memory, Visual Memory, Visual Motor Speed, Reaction Time, Impulse Control). For the Verbal Memory, Visual Memory, Visual Motor Speed and Reaction Time composites there were significant neurocognitive score changes between several test intervals. Taking these results into account, in conjunction with substantial variability in performance, it is concluded that there is a need for annual baseline testing throughout the high school years. The secondary objective was to generate normative tables (Means and Standard Deviations) on the ImPACT test for the five participant groups at each of the five test intervals, including data for: the five composite scores (Verbal Memory, Visual Memory, Visual Motor Speed, Reaction Time, Impulse Control); for the twelve subtest scores test that go to make up the composite scores; and for four additional memory subcomponent scores (Word Memory immediate recall, Word Memory delayed recall, Design Memory immediate recall, Design Memory delayed recall). The results provide a clinical and heuristic normative platform for future use with brain injured individuals, which can be used to facilitate clinical interpretations of postconcussion assessments.
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  • Date Issued: 2020

A formative intervention study of how learner voice and leadership can be developed within a Learner Representative Council (LRC) in an urban combined school, Namibia

  • Authors: Shipopyeni, Salomo S M
  • Date: 2020
  • Subjects: Education, Secondary -- Namibia , Student government -- Namibia -- Case studies , Student participation in administration -- Namibia -- Case studies
  • Language: English
  • Type: text , Thesis , Masters , MEd
  • Identifier: http://hdl.handle.net/10962/144934 , vital:38393
  • Description: The Namibian Education system, after the country gained independence, introduced various reforms to ensure the attainment of the educational goals of access, quality, equity and democracy in schools. One of the policies introduced to promote democracy in our schools was The Educational Act 16 of 2001, which gave birth to the establishment of Learners Representatives Councils (LRC) in schools. The LRC body is the legal learner leadership body established to ensure learners are represented in school leadership. However, various studies have revealed that this legal body of learners in many schools has been merely ‘rubber-stamping’ decisions made by teachers; learners have had very little input in decisions that affect them as learners. Thus, I was prompted to conduct this formative intervention study on learner leadership at an urban combined school in Namibia. Informed by distributed and transformative leadership theories, the study aimed to develop leadership within the LRC members and the needed expansive transformation regarding leadership practices in school. The intention was for learners to be enabled to practice their democratic right in decision-making processes in matters that concerned their schooling and learning. This study was theoretically and analytically framed by second generation CulturalHistorical Activity Theory. The participants included 12 LRC members, the LRC liaison teacher, the class register teacher, three school management team members and the principal. The research method was a case study, underpinned by the critical paradigm to bring about the fundamental expansive transformation in learner leadership practices at the case study school. This qualitative study was divided into two phases, a contextual profiling phase and an intervention phase. Data were generated through document analysis, observation, questionnaires, focus group interviews and Change Laboratory Workshops. The data were generated to answer the over-arching question: How learner voice and leadership can be developed within a Learner Representative Council (LRC) in an urban combined school, Namibia. The data were analysed inductively and abductively. The key findings were: first, there were a variety of understandings of the concept learner leadership; second, the involvement of LRC members in decision-making processes was limited to involvement in organising extracurricular activities and controlling of other learners at school; third, leadership development opportunities for learners at the case study school were only provided through training at the beginning of the year and the LRC carrying out various activities and roles at the case study school. Several challenges that constrained the LRC voice and leadership development were surfaced and, through Change Laboratory Workshops, the participants of the activity system together with me (the researcher-interventionist), identified the expansive learning opportunities to develop leadership amongst Learner Representative Council (LRC) members. In the final analysis, this study will contribute to the production of knowledge on the concept of learner leadership in the context of Namibia. Fellow scholars, professionals, colleagues and policy makers in education are requested to engage with this thesis to contribute to our understanding of this important aspect of our field and speak back to policy.
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  • Date Issued: 2020

A Framework for Broadband Adoption in Buffalo City Metropolitan Municipality to Enable Citizen Access to e-Government

  • Authors: Twetwa-Dube, Sithandile Pornelia
  • Date: 2020
  • Subjects: Electronic government information
  • Language: English
  • Type: Thesis , Masters , MCom (Information Systems)
  • Identifier: http://hdl.handle.net/10353/18963 , vital:43003
  • Description: E-government has been adopted as one of the cornerstones of the government‘s strategy for making services accessible to its citizens. The aim of this broadband adoption is to provide high quality public sector services via digital channels to improve cost-efficiency and generate benefits to municipality employees and citizen. A major challenge that municipalities face is the lack of public participation which restricts levels of communication between governments and municipalities and the citizen where public misses out on information and services available online, which results in further inequality. This has a devastating impact on service delivery because participatory democracy would be non-existent. Limited IT infrastructure, resistance to change, cultural barriers and exposure of malpractice are main themes related to IT usage or facilitating IT access for the wider public. Furthermore, lack of meaningful participation and freedom of association emerged as themes related to governance effectiveness. A mixed approach within a case study was considered, and data was collected through an online questionnaire and review of current literature. The study collected primary data by conducting web based questionnaires comprising sixty respondent’s citizens and fifteen municipal employees, including Information and Communication Technology (ICT) employees and broadband task team members. Statistical Package for the Social Science (SPSS) to analyse data from questionnaires. The selected BCMM employees of the population were known to have the relevant knowledge, time and experience to participate. Responses to each question developed the framework further based on the findings. Respondents were selected based on their appropriate knowledge and experience of the problem domain. Six experts were selected for final evaluation of the research findings. Firstly, the findings provided on barriers impact on the adoption of e-government. Secondly, on the techniques available to ensure access to e-government within BCMM. Thirdly, on the availability of technologies currently in the Buffalo City Metropolitan Municipality. Finally, on the elements of a Buffalo City Metropolitan Municipality broadband adoption strategy. This study evaluates barriers of e-government adoption, assessing strategies and techniques for accessing e-government services, examines current technologies to support e-government service within municipalities and analyses elements of Buffalo City Metropolitan Municipality broadband adoption strategy. A broadband adoption model was proposed based on empirical findings. Key adoption factors include adoption benefits and drivers, concerns and barriers and adoption interventions. These factors provide an essential foundation for the development of the proposed broadband adoption framework. The contribution of this study is a framework based on the Unified Theory of Acceptance and Use of Technology (UTAUT) and Technology Organisation Environment (TOE) framework to determine factors that influence or restrict a citizen’s intention to use and adopt technology, specifically broadband, in e-government services as a tool for citizen engagement. The proposed framework aims to overcome barriers to broadband adoption 4 Final Submission of Thesis, Dissertation or Research Report/Project, Conference or Exam Paper in municipalities, specifically Buffalo City Metropolitan Municipality (BCMM) to enable citizens’ access to e-government services.
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  • Date Issued: 2020

A framework for digital signature implementations for e-government services

  • Authors: Kumalo, Mmaphefo Octavia
  • Date: 2020
  • Subjects: Electronic government information , Internet in public administration Municipal government -- Data processing
  • Language: English
  • Type: Thesis , Masters , MPhil
  • Identifier: http://hdl.handle.net/10948/46086 , vital:39490
  • Description: The advent of the Internet has brought with it new innovations, new ways of doing business, new ways of working, new ways of engaging, and new forms of business models. It has ultimately disrupted the traditional ways in which we communicate, socialise, and live life in general. This era has heralded the requirement for digitization and has brought about the digital economy and the Fourth Industrial Revolution. The fundamental ways in which companies and governments do business are changing due to the increased innovation, and the cost efficiencies that this era has brought with it. Like most governments worldwide, the South African government has responded to the Internet revolution and is taking advantage of it through e-government initiatives. The direct effects of e-government include cost savings, efficiencies, improved and continuous interactions and communications with citizens, better public procurement, and improved tax collection. The area of digitization has the potential to improve how the South African government delivers services to citizens and those that reside within the borders of the country. Amongst the five elements of successful e-government transformation, process reform is at the top of the list. e-Government is not just about the automation of existing processes and inefficiencies. It is also about the creation of new processes and new relationships between all the stakeholders involved. In the South African context, the lack of optimised, automated, and digitalised processes within various government departments has impeded crossfunctional processes’ effectiveness and efficiencies. Manual interventions in processing and transactions occur to comply with the legal requirement to manually sign documents. This poses difficulties in integrating processes within government departments to achieve a seamless experience for the citizen. As a result, this treatise sets out to answer the question of what needs to be in place to allow for the utilisation of digital signatures in automating the processing of e-government services for a seamless experience for citizens and businesses. The resulting Digital Signature Framework can be used by government departments to implement digital signatures and provides providing guidance, facilitating understanding, and providing ease of use, scalability, and agility.
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  • Date Issued: 2020

A framework for enhancing compliance with Employee Performance Management and Development Systems(EPMDS) among public sector doctors in BCMM health facilities

  • Authors: Bayeni, Luvuyo Lonwabo Precious
  • Date: 2020
  • Subjects: Performance -- Management
  • Language: English
  • Type: Thesis , Masters , MBA
  • Identifier: http://hdl.handle.net/10948/47520 , vital:40116
  • Description: This research explored an employee performance management and development system in the context of the public health centres in the Eastern Cape Province of South Africa. The study reviewed the literature on EPMDS in the public health sector of South Africa, noting the shortfalls, challenges, and ways in which it could be improved. The major findings from the study include the need to review the entire policy, revise the pay-scales, and co-create a new EPMDS policy creating space for the representation of the views of the employees. Without completing the development and performance evaluation, grade progression cannot be implemented despite years of service; hence the problem doctors face with their salary levels. The current EPMDS was found to be ineffective due to the wide discrepancy that exists between doctors and other health professionals in public health institutions. Among the commitment motivators highlighted by the respondents, was the need to develop an organisational culture that permits employees to recognise that they are appreciated. Future research must consider using mixed research methods, in the context of other South African Provinces and include a larger sample of research participants.
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  • Date Issued: 2020

A framework for enhancing the transgenerational potential of indigenous african family businesses

  • Authors: Matchaba-Hove, Mtonhodzi
  • Date: 2020
  • Subjects: Family-owned business enterprises -- Succession Indigenous peoples -- Economic conditions
  • Language: English
  • Type: Thesis , Doctoral , DCom
  • Identifier: http://hdl.handle.net/10948/48894 , vital:41168
  • Description: Family businesses are the backbone of many economies around the globe and are believed to constitute over two-thirds of all businesses worldwide. For nearly 300 years, the Southern African economy has been developing as a consequence of the contribution of family businesses to the region’s economy. Despite their importance to the economies of countries, their overall failure rate remains high. Given the important economic and societal contribution that family businesses make, their survival rates are a matter of concern. As far as can be established, little research has been conducted among indigenous African family businesses. The research done to date lacks depth in terms of the topics covered and the countries sampled. The majority of studies on family businesses have been done in European, American and Asian settings. Notably, the research project on Successful Transgenerational Entrepreneurship Practices (STEP) has investigated transgenerational entrepreneurship among family businesses around the world. The STEP project proposes a theoretical framework, known as the STEP framework, which to date has not been applied to the indigenous African context. There is a great need for deeper insights into, and an increased understanding of the practices implemented among indigenous African family businesses that have survived across the generations, and of the context in which these businesses operate. Therefore, the primary objective of this study is to explore and describe the factors that influence the transgenerational potential of indigenous African family businesses so as to assess the appropriateness of an existing non-African framework, namely the STEP framework, and to reconfigure it for the African context. The STEP framework proposes that various contextual factors influence both the entrepreneurial orientation and the familiness resource pools of family businesses, which in turn influence each other, and ultimately the transgenerational potential of the family business. The underlying theory applied in the study is Hofstede’s Cultural Dimensions model. Hofstede’s model provides theoretical support for the belief that the context in which a theory or framework is applied has a big influence on the successful application of such a framework. Therefore, a need exists to contextualise the STEP framework to the context in which it is being applied. An interpretivist research paradigm and a qualitative methodological approach were deemed the most suitable for the current study, as this paradigm and approach enabled the researcher to address the dynamics and invisible issues within family businesses. The current study adopted a multiple case study methodology. Adopting this methodology allowed for a deeper understanding of the object of interest. The three cases were systematically selected, using purposive sampling, to ensure that a credible and indicative sample was obtained. The criteria used for selection were based on the STEP project guidelines and the three businesses selected were from South Africa, Zimbabwe and Botswana, of indigenous African heritage and have showed sustained growth and success since their establishment. The reason for these selection criteria was to ensure that the study appropriately addressed the defined research objectives and the gap in the body of knowledge on transgenerational entrepreneurship in the African context. The instrument used to guide the key-informant interviews in this research was a semi-structured interview schedule adapted from the STEP project interview schedule. Once all the data was collected, a combination of directed content analysis and explanation building was used to analyse the data. A framework for enhancing the transgenerational potential of indigenous African family businesses is proposed in this study, based on the practices adopted by the successful indigenous African family businesses which participated. The framework developed adapts the STEP framework for the indigenous African family business context. As in the STEP framework, the framework proposed for indigenous African family businesses highlights several external contextual factors as influencing both the familiness resource pools and the dimensions of entrepreneurial orientation. In the context of indigenous African family businesses, the external contextual factors most influential are the philosophy of Ubuntu, the collectivist national culture, as well as the community and extended family commitments. The external contextual factors, namely, the business environment and the industry in which the business operates, were found to be particularly influential on the entrepreneurial orientation displayed by the participating family businesses. All eight familiness resource pools, as well as the five dimensions of entrepreneurial orientation as proposed in the STEP framework, still form part of the framework proposed for indigenous African family businesses. However, for some the nature thereof differed somewhat from the original descriptions. Therefore, the original names were adapted to better describe these concepts as applicable to an indigenous African family business context. The proposed framework supports the multi-dimensional nature of performance outcomes among indigenous African family businesses. It proposes that in an indigenous African family business context, entrepreneurial performance outcomes are important to the extent that they contribute to achieving the financial performance outcomes, while the financial performance outcomes are important to the extent that they contribute to achieving the social performance outcomes. This study contributes to a greater understanding of successful indigenous African family businesses and their best practices, specifically an understanding of the practices adopted with regards to the familiness resource pools and entrepreneurial orientation. Furthermore, this study has expanded on the understanding of paternalism in that it has provides greater clarity on the nature of this leadership style, as well as the positive outcomes associated with it, in an African context. The study also has significance for educators, who can incorporate the lessons learned from it into their entrepreneurship and family business teaching.
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  • Date Issued: 2020

A framework for price tariffs in the costing structures of South African private hospitals

  • Authors: Botha, Gideon
  • Date: 2020
  • Subjects: Hospitals, Proprietary
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: http://hdl.handle.net/10948/47489 , vital:40126
  • Description: The increase of South African health care costs can be extrapolated into the global healthcare cost challenge, with various factors contributing to this problem. One of the factors viewed as being central to the rising cost of health care is the inability of health care provider organisations to accurately measure unit costs of resources used to treat a patient for their medical condition and patient outcomes. The measurement of an accurate unit cost and patient outcomes is imperative to improving value, which is seen as an improvement in outcomes for every rand spent. The determination of price tariffs and the price tariff payment model used to onward bill the price tariff for medical services have also been identified as having a central role in improving value in health care. In order for price tariffs to improve value, they should be reflective and be based on an accurate unit cost that reflects the cost of resources used to provide efficient and effective care for a patient’s medical condition. For the price tariff payment model to improve value, it needs to reward providers for delivering superior patient outcomes at a lower cost by making price tariffs contingent on achieving specified outcomes as well as incorporating performance payments or holdbacks based on outcomes achieved. This study provides a framework for price tariffs in the costing structures of South African private hospitals. Secondary research was conducted in the form of a comprehensive literature search in order to do an interpretative analysis of the strengths and weaknesses of the various combinations of unit costing models and price tariff payment models used to determine prices in private hospitals. The literature review was followed by primary research that involved three phases, all of which used a qualitative research approach. In Phase 1, primary data were collected using unobtrusive measures that consisted of a data request first, followed by unstructured interviews with representatives of Hospital A and Hospital B to obtain an analysis of the combinations of unit costing model and price tariff payment model used for a laparoscopic appendectomy. In Phase 2, data were collected by means of an unstructured interview with a surgeon describing a laparoscopic appendectomy procedure in detail and based on this process description, the approximate costs for the various resources that were sourced from different suppliers could be calculated. The data analysis and interpretation were done in three phases, with each phase having different research objectives. The data were first coded and then interpreted. In the first primary research phase, the combinations of unit costing models and price tariff payment models used by private Hospital A and Hospital B were evaluated. In the second phase, the recommended combination of unit costing model and price tariff payment model was applied to a hypothetical example and evaluated. In the final phase, based on the outcome of the first and second research phases, a combination of unit costing model and price tariff payment model for private hospitals was recommended. The results showed that the recommended combination of unit costing and price tariff payment model namely time-driven activity-based costing with the global fee price tariff payment model was the most appropriate to determine price tariffs in private hospitals when compared to the unit costing models and price tariff payment models used by Hospital A and Hospital B for a laparoscopic appendectomy. Furthermore, the recommended combination of unit costing model and price tariff payment model was found to be usable for the determination of price tariffs in the costing structures of private hospitals. The time-driven activity-based costing model and global fee price tariff payment model should be adopted or used as guidelines for determining price tariffs in private hospitals in South Africa. Price tariffs would be more transparent as they would reflect the actual resource cost of treating the patient and the resources used and treatment provided could then be assessed against the delivery value chain that charts the principal activities involved in a patient’s care for a medical condition to ensure that patient best-practice protocols are followed. The proposed framework enables the determination of price tariffs based on an accurate unit cost reflecting the actual resources used to provide efficient and effective care and also improve value for the patient.
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  • Date Issued: 2020

A framework for price tariffs in the costing structures of South African private hospitals

  • Authors: Botha, Gideon
  • Date: 2020
  • Subjects: Medical care, Cost of -- South Africa , Medical economics -- South Africa Medical care -- South Africa -- Cost control Cost accounting
  • Language: English
  • Type: Thesis , Doctoral , DPhil
  • Identifier: http://hdl.handle.net/10948/50432 , vital:42167
  • Description: The increase of South African health care costs can be extrapolated into the global healthcare cost challenge, with various factors contributing to this problem. One of the factors viewed as being central to the rising cost of health care is the inability of health care provider organisations to accurately measure unit costs of resources used to treat a patient for their medical condition and patient outcomes. The measurement of an accurate unit cost and patient outcomes is imperative to improving value, which is seen as an improvement in outcomes for every rand spent. The determination of price tariffs and the price tariff payment model used to onward bill the price tariff for medical services have also been identified as having a central role in improving value in health care. In order for price tariffs to improve value, they should be reflective and be based on an accurate unit cost that reflects the cost of resources used to provide efficient and effective care for a patient’s medical condition. For the price tariff payment model to improve value, it needs to reward providers for delivering superior patient outcomes at a lower cost by making price tariffs contingent on achieving specified outcomes as well as incorporating performance payments or holdbacks based on outcomes achieved. This study provides a framework for price tariffs in the costing structures of South African private hospitals. Secondary research was conducted in the form of a comprehensive literature search in order to do an interpretative analysis of the strengths and weaknesses of the various combinations of unit costing models and price tariff payment models used to determine prices in private hospitals. The literature review was followed by primary research that involved three phases, all of which used a qualitative research approach. In Phase 1, primary data were collected using unobtrusive measures that consisted of a data request first, followed by unstructured interviews with representatives of Hospital A and Hospital B to obtain an analysis of the combinations of unit costing model and price tariff payment model used for a laparoscopic appendectomy. In Phase 2, data were collected by means of an unstructured interview with a surgeon describing a laparoscopic appendectomy procedure in detail and based on this process description, the approximate costs for the various resources that were sourced from different suppliers could be calculated. The data analysis and interpretation were done in three phases, with each phase having different research objectives. The data were first coded and then interpreted. In the first primary research phase, the combinations of unit costing models and price tariff payment models used by private Hospital A and Hospital B were evaluated. In the second phase, the recommended combination of unit costing model and price tariff payment model was applied to a hypothetical example and evaluated. In the final phase, based on the outcome of the first and second research phases, a combination of unit costing model and price tariff payment model for private hospitals was recommended. The results showed that the recommended combination of unit costing and price tariff payment model namely time-driven activity-based costing with the global fee price tariff payment model was the most appropriate to determine price tariffs in private hospitals when compared to the unit costing models and price tariff payment models used by Hospital A and Hospital B for a laparoscopic appendectomy. Furthermore, the recommended combination of unit costing model and price tariff payment model was found to be usable for the determination of price tariffs in the costing structures of private hospitals. The time-driven activity-based costing model and global fee price tariff payment model should be adopted or used as guidelines for determining price tariffs in private hospitals in South Africa. Price tariffs would be more transparent as they would reflect the actual resource cost of treating the patient and the resources used and treatment provided could then be assessed against the delivery value chain that charts the principal activities involved in a patient’s care for a medical condition to ensure that patient best-practice protocols are followed. The proposed framework enables the determination of price tariffs based on an accurate unit cost reflecting the actual resources used to provide efficient and effective care and also improve value for the patient.
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  • Date Issued: 2020

A framework for supplier selection in the Nelson Mandela Bay retail industry

  • Authors: Mavela, A
  • Date: 2020
  • Subjects: Business logistics -- South Africa -- Nelson Mandela Bay Municipality
  • Language: English
  • Type: Thesis , Masters , MCom
  • Identifier: http://hdl.handle.net/10948/48905 , vital:41169
  • Description: The success of business firms operating in the retail industry is largely dependent on the performance rendered by their supply base. Choosing the incorrect supplier could have dire consequences for the retailer’s performance, as suppliers are generally considered an extension of the retailer. Organisations base their operational expertise on the key performance objectives of cost, service, quality, speed, dependability and flexibility, which becomes the basis of their selection criteria when evaluating suppliers. The primary objective of this study was to develop a framework that guides retailers in their supplier selection process with the ultimate goal of formulating strategies to improve Nelson Mandela Bay’s (NMB’s) retail performance. In support of the primary objective, it was necessary to identify the current supplier selection criteria used in the NMB retail industry and the challenges that retailers face when selecting suppliers. The study set out to assess the effects of utilising established supplier selection criteria on retailers’ performance, as well as to identify strategies that retailers should employ to improve their performance. A quantitative research approach was utilised to collect data from a sample of 248 retailers and procurement and logistics managers. The empirical findings of the study identified flexibility, timeous delivery and reliability as the most important supplier selection criteria identified by retailers in NMB. The findings also revealed that utilising established supplier selection criteria has a significantly positive effect on retailers’ performance. Lack of collaboration between suppliers and retailers, lack of transparency between suppliers and retailers and suppliers’ limited knowledge of the criteria by which they are judged were identified as the most significant challenges facing retailers in NMB. The empirical findings also identified an increase in a retailer’s competitive advantage and revenue as the benefits of utilising supplier selection criteria to improve a retailer’s performance. The conclusions and implications of the empirical findings are provided and recommendations made. The study advances a framework to assist in guiding the retailers and procurement and logistics managers, retail researchers and policy makers when selecting suppliers. The study suggests that retailers should identify the most important supplier selection criteria, inform potential suppliers of the importance v of those criteria, select suppliers based on those criteria and utilise those criteria to evaluate the suppliers’ performance.
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  • Date Issued: 2020

A framework for teaching secure coding practices through a blended learning approach

  • Authors: Mdunyelwa, Vuyolwethu Sizoli
  • Date: 2020
  • Subjects: Blended learning , Blended learning -- Case studies Computer security
  • Language: English
  • Type: Thesis , Masters , MIT
  • Identifier: http://hdl.handle.net/10948/49940 , vital:41890
  • Description: With the recent increase in cyber-related attacks, cybersecurity is becoming a key area of concern for many organisations. Cybersecurity vulnerabilities are typically addressed through the implementation of various cybersecurity controls. These controls can be operational, technical or physical in nature. The focus of this research, however, is on technical controls with a specific focus on securing web applications. This research investigated whether third year software development students at the Nelson Mandela University adhered to secure coding practices in their capstone projects. In order to determine adherence, secure coding practices were identified from OWASP for the data access layer in web applications developed in the .NET environment. This was addressed by Secondary Objective, which was To determine what secure coding practices a web application developer should adhere to in the .NET environment. These secure coding practices were used to conduct a code review on 2015 third year capstone projects, and addressed Secondary Objective, To determine the adherence of third year software development capstone projects to the identified secure coding practices. The results for the code review were analysed and indicated low levels of adherence which led to the Problem Statement of this research, namely: Undergraduate software development students do not consistently adhere to secure coding practices when developing their third-year capstone projects, thereby leading to vulnerabilities in their web applications. In order to address this Problem Statement, the Primary Objective was identified, To develop a framework for teaching secure coding practices through a blended learning approach. Secondary Objective, To determine whether third year software development students have the requisite knowledge relating to secure coding, took the form of a questionnaire to assess students' knowledge relating to secure coding practices. This required the achievement of further sub-objectives which addressed both the knowledge and behaviour of software development students. The results of this questionnaire indicated that many of the third-year software development students lacked the requisite knowledge. This lack of knowledge and adherence was addressed through an educational intervention, meeting Secondary Objective, To design and implement an educational intervention to support software development students in the development of secure web applications. In terms of knowledge, online lessons were developed addressing each of the secure coding practices identified. In order to address adherence, students were given a checklist to monitor their adherence to the identified secure coding practices. Secondary Objective, To determine the exact of the educational intervention on both student adherence and their requisite knowledge regarding secure coding practices, involved the varication of the educational intervention, and comprised of two components, knowledge and behaviour. Knowledge varication took the form of an online questionnaire given to 2017 third year project students. To address behavioural adherence, the researcher conducted a code review on the 2017 capstone projects. The results from the varication showed a general improvement in students' knowledge and high levels of adherence to secure coding practices. Finally, a framework was developed that encompassed the key elements of this research, thereby providing guidance to support the development of se cure web applications in higher education institutions and meeting the primary objective of this study.
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  • Date Issued: 2020

A framework for the implementation of e-government as a service delivery mechanism in South Africa: The case of the Eastern Cape Thusong Service Centres

  • Authors: Madyibi, Ayanda
  • Date: 2020
  • Subjects: Electronic government information Technological innovations Information technology
  • Language: English
  • Type: Thesis , Doctoral , PhD(Information Systems)
  • Identifier: http://hdl.handle.net/10353/18908 , vital:42997
  • Description: E-government has emerged as an effective means of delivering much-needed online services to the citizens, businesses and other government institutions. This emanates from the advancement of Information and Communication Technology (ICT), the internet and the emerging technologies associated with the Fourth Industrial Revolution (4IR). E-government has essentially transformed the culture, structure and the way of doing business by public institutions in providing government services. In the past, e-government has been popular in developed countries but recently many developing countries are starting to appreciate the need to implement the initiative. However, the implementation of e-government has various challenges that have been identified through research and include technological, organisational and environmental aspects. Therefore, the researcher was motivated to study e-government to improve the delivery of services to citizens in South Africa. The objective of the research was to develop a framework for the implementation of egovernment as a service delivery mechanism in South Africa. The research process led to the identification of challenges that impact the implementation of e-government by applying an underlying Information Systems (IS) theoretical model, namely the Technology-OrganisationEnvironment (TOE) framework. The review of literature allowed the researcher to construct a conceptual theoretical framework which was then applied to the case study in order to understand the factors affecting the implementation of e-government in South Africa. Qualitative research data was collected using Thusong Service Centres in the Eastern Cape as a case study. Thusong Service Centres are government service centres based in rural communities which are used for the provision of online government services to these communities. The empirical data was collected using 22 respondents from five organisational and user perspectives: (1) State Information Technology Agency (SITA) as an agency of government responsible for ICT in South Africa, (2) the Senior ICT Managers from various National, Provincial and Local government entities, (3) Thusong Service Centre Managers, (4) Thusong Service Centre End-Users and (5) Expert Reviews. Documents that included the National e-Government Strategy, e-Government Policy, National Broadband Policy, ICT Policy White Paper were also consulted as secondary data. The conceptual theoretical framework was then revised based on the empirical evidence using the interpretive exploratory approach and triangulated data. The consolidated data from both the literature review and empirical evidence assisted in closing the gap between e-government implementation theory and practice. A detailed e-government implementation framework was then developed with the critical factors that impact the successful implementation of e- ii | P a g e government. E-government subject experts were also given the mandate to review the interview questions and the framework. The use of this framework was then explained in terms of how it can assist government decision-makers in South Africa for the effective and efficient delivery of services to the citizens. The research study has contributed to the e-government body of knowledge through the identified factors utilising the TOE framework at an organisational level for developing countries like South Africa.
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  • Date Issued: 2020

A framework to enhance Information and Communication Technology (ICT) readiness for business continuity at the South African Revenue Services (SARS)

  • Authors: Mathase, Euphodia
  • Date: 2020
  • Subjects: Internet in public administration -- Taxation -- South Africa Electronic commerce -- Government policy -- South Africa
  • Language: English
  • Type: Thesis , Masters , MPhil
  • Identifier: http://hdl.handle.net/10948/49496 , vital:41726
  • Description: Many organisations, especially public sector organisations, are required to ensure that they are able to continue with their operation in cases of major disasters that affect the organisations. In the same light, the South African Revenue Services (SARS), being a quasi-government organisation, faces a similar phenomenon. The main purpose of conducting this research was to explore a problem in depth that was identified at the SARS. SARS does not have a comprehensive business continuity plan. The study therefore examined possible techniques or actions for ensuring information and communication technology (ICT) readiness and business continuity, explored various frameworks and policy documents which will assist public entities with readiness for business continuity, and identified frameworks that will assist SARS in implementing an effective ICT readiness for business continuity. The study adopted the design science research approach and aspects of design science research in information systems. Data gathered through the questionnaire instrument was used to design a framework that can be adopted at SARS to enhance ICT readiness for business continuity. The research findings show the importance of effective business continuity management (BCM) and a framework that can be used to implement an effective BCM.
  • Full Text:
  • Date Issued: 2020

A framework to integrate secure programming principles into undergraduate computing curricula

  • Authors: Bangani, Sifiso Matthews
  • Date: 2020
  • Subjects: Information technology -- Study and teaching (Higher) , Electronic data processing personnel -- Training of Computer software -- Development
  • Language: English
  • Type: Thesis , Masters , MIT
  • Identifier: http://hdl.handle.net/10948/46019 , vital:39409
  • Description: Many graduate software developers are not competent in secure programming, resulting in risks that are caused by vulnerabilities in the application code of software applications. These graduate software developers are equipped with programming knowledge and skills from universities, however, these software developers are rarely equipped with secure programming knowledge and skills from the undergraduate level. Although there are various techniques for writing secure code in the current body of knowledge, these techniques are rarely fundamental components of a computing curriculum, resulting in incompetent graduate software developers. The security aspect of software applications, is considered as an important aspect that can reflect the ability of a system to prevent data exposures and loss of information. For businesses that rely on software applications to keep operations running, a failure of a software application can stop production, interrupt processes, and may lead to data breaches and financial losses. This research argued that secure programming education needs to be included across computing curricula, and thus, the primary objective of this dissertation was: To develop a framework for integrating secure programming principles into undergraduate computing curricula. It proposes a framework for the incorporation of secure programming principles into undergraduate computing curricula, through a step-by-step approach. This framework includes the identification of application risks and secure programming practices as they relate to each other, and to the basic programming concepts taught to undergraduate students. It specifically aims to improve the security of software applications developed in the .Net framework environment. The main research methods used in this study included a literature view, thematic content analysis, argumentation, and modelling.
  • Full Text:
  • Date Issued: 2020

A framework to measure the degree of alignment between corporate and IT/IS objectives at Randwater

  • Authors: Sigasa, Moshane Lydia
  • Date: 2020
  • Subjects: Business enterprises -- Computer networks -- Security measures , Data protection Information technology -- Security measures
  • Language: English
  • Type: Thesis , Masters , MPhil
  • Identifier: http://hdl.handle.net/10948/47156 , vital:39818
  • Description: The South African Government has institutionalised a Corporate Governance of ICT Policy Framework which was developed by Department of Public Service and Administration (DPSA). The framework has adopted some elements of KING III, ISO 38500 and COBIT. Consequently, it is now a requirement by the South African Government that all its entities must adopt this framework. Nevertheless, it is not clear how government has emphasised this alignment in such entities. The problem statement in this study was that Randwater is unable to realise full value of the investment in IT/IS because there is misalignment between IT objectives or deliverables and the corporate objectives. This study sought to identify a suitable framework which meets the ICT policy criteria as set out by the DPSA, which will facilitate the alignment between corporate objectives and IT/IS objectives at Randwater. This was achieved through the development and refinement of the artefact through the various iteration phases. Additionally, an online survey was used to collect data from a focus group comprising IT experts and senior management at Randwater. The Information Technology Governance Institute Framework was employed to assist in the development of the questions. The survey results were utilised during the validation of the artefact produced by this research study in a workshop. The findings were then linked with the related literature which either supported or rejected the findings through discussions on the literature and thereafter conclusions were made based on these findings. Furthermore, a literature review was conducted to gain a better understanding of what has been done in the field of research in order to assist in defining the problem that this research seeks to solve so as to inform the development of design characteristics. The research process employed the Nelson Mandela University – Design Science Strategy Methodology referred to as (NMU – DSSM) with the goal of developing an artefact in the form of a framework. The research process entailed studying the existing literature and analysing the aspects relating to corporate governance, IT governance, frameworks, and strategies to be able to measure the degree of alignment. The phases of designing the artefact were analysis, design, evaluate, validate and diffuse phases. The final artefact developed was a framework that incorporated the principles of King IV and ISO 38500 in corporate governance and ICT goals alignment. The final artefact also embedded transparency, accountability and security as important elements in the implementation of the artefact. The survey findings were instrumental in the development of the artefact that brings alignment between business strategy and IT objectives at Randwater. From the findings, in terms of IT flexibility, it was revealed that the interrelated parts of the system at Randwater were modular. It was also concluded that there is lack of communication about the manner in which the components of the information systems are organised and integrated in order to allow for rapid changes and that the organisational IT infrastructure and applications were loosely coupled. The findings further revealed that the business had established corporate rules and standards for hardware and operating systems to ensure platform compatibility. It was also revealed that organisational IT applications were developed based on compliance guidelines. In terms of IT-enabled dynamic capabilities, it was revealed that IT systems at Randwater are not capable of scanning the environment and identifying new business opportunities and are not capable of anticipating discontinuities arising in the business domain by developing greater reactive and proactive strength. It was also revealed that it was concluded that IT systems were capable of achieving strategic alignment between IT flexibility and dynamic capabilities. Therefore, design science was the ideal research paradigm towards addressing the research problem and the artefact designed was a viable research contribution. The significance of the study was that it contributed to the development of technology-based solutions to an important and relevant business problem of alignment of business strategy to IT goals. The design evaluation, the utility, quality, and efficacy of the final design artefact was rigorously demonstrated via well-executed evaluation methods. The study also contributed to the literature
  • Full Text:
  • Date Issued: 2020

A framework to measure the degree of alignment between corporate and IT/IS objectives at Randwater

  • Authors: Sigasa, Moshane Lydia
  • Date: 2020
  • Subjects: Information technology -- Management , Business enterprises -- Computer networks
  • Language: English
  • Type: Thesis , Masters , MPhil
  • Identifier: http://hdl.handle.net/10948/48841 , vital:41145
  • Description: The South African Government has institutionalised a Corporate Governance of ICT Policy Framework which was developed by Department of Public Service and Administration (DPSA). The framework has adopted some elements of KING III, ISO 38500 and COBIT. Consequently, it is now a requirement by the South African Government that all its entities must adopt this framework. Nevertheless, it is not clear how government has emphasised this alignment in such entities. The problem statement in this study was that Randwater is unable to realise full value of the investment in IT/IS because there is misalignment between IT objectives or deliverables and the corporate objectives. This study sought to identify a suitable framework which meets the ICT policy criteria as set out by the DPSA, which will facilitate the alignment between corporate objectives and IT/IS objectives at Randwater. This was achieved through the development and refinement of the artefact through the various iteration phases. Additionally, an online survey was used to collect data from a focus group comprising IT experts and senior management at Randwater. The Information Technology Governance Institute Framework was employed to assist in the development of the questions. The survey results were utilised during the validation of the artefact produced by this research study in a workshop. The findings were then linked with the related literature which either supported or rejected the findings through discussions on the literature and thereafter conclusions were made based on these findings. Furthermore, a literature review was conducted to gain a better understanding of what has been done in the field of research in order to assist in defining the problem that this research seeks to solve so as to inform the development of design characteristics. The research process employed the Nelson Mandela University – Design Science Strategy Methodology referred to as (NMU – DSSM) with the goal of developing an artefact in the form of a framework. The research process entailed studying the existing literature and analysing the aspects relating to corporate governance, IT governance, frameworks, and strategies to be able to measure the degree of alignment. The phases of designing the artefact were analysis, design, evaluate, validate and diffuse phases. The final artefact developed was a framework that incorporated the principles of King IV and ISO 38500 in corporate governance and ICT goals alignment. The final artefact also embedded transparency, accountability and security as important elements in the implementation of the artefact. v The survey findings were instrumental in the development of the artefact that brings alignment between business strategy and IT objectives at Randwater. From the findings, in terms of IT flexibility, it was revealed that the interrelated parts of the system at Randwater were modular. It was also concluded that there is lack of communication about the manner in which the components of the information systems are organised and integrated in order to allow for rapid changes and that the organisational IT infrastructure and applications were loosely coupled. The findings further revealed that the business had established corporate rules and standards for hardware and operating systems to ensure platform compatibility. It was also revealed that organisational IT applications were developed based on compliance guidelines. In terms of IT-enabled dynamic capabilities, it was revealed that IT systems at Randwater are not capable of scanning the environment and identifying new business opportunities and are not capable of anticipating discontinuities arising in the business domain by developing greater reactive and proactive strength. It was also revealed that it was concluded that IT systems were capable of achieving strategic alignment between IT flexibility and dynamic capabilities. Therefore, design science was the ideal research paradigm towards addressing the research problem and the artefact designed was a viable research contribution. The significance of the study was that it contributed to the development of technology-based solutions to an important and relevant business problem of alignment of business strategy to IT goals. The design evaluation, the utility, quality, and efficacy of the final design artefact was rigorously demonstrated via well-executed evaluation methods. The study also contributed to the literature available on business strategic alignment with ICT goals.
  • Full Text:
  • Date Issued: 2020

A gendered analysis of conditional cash based transfers: a case study of Puntland Technical Vocational Skills Training Programme, Somalia

  • Authors: Chitombi, Rumbidzai
  • Date: 2020
  • Subjects: Puntland Technical Vocational Skills Training Programme , Transfer payments -- Somalia -- Case studies , Economic assistance, Domestic -- Somalia , Economic development -- Social aspects -- Somalia , Women -- Somalia -- Social conditions
  • Language: English
  • Type: text , Thesis , Doctoral , PhD
  • Identifier: http://hdl.handle.net/10962/167335 , vital:41469
  • Description: As part of the worldwide development system, conditional cash transfer (CCT) programmes have become an increasingly popular policy and development approach in seeking to address poverty, especially in developing countries. Under the CCT programmes, beneficiaries are given assistance in the form of either cash or cash vouchers after fulfilling certain obligations of the development programme, such as attending training, enacting proper health care, or ensuring regular school attendance of children. The programmes have been described as a ‘double-edged sword’ since they aim to address poverty and, at the same time, reduce reliance on government largesse. In this regard, they are seen as potentially effective, and more empowering, alternatives to more traditional social assistance programmes whereby poor people receive welfare assistance in the form of ‘in kind’ and ‘unconditional’ assistance, receiving this as either food or shelter commodities, and without having to meet any conditions in doing so. This ‘traditional’ way of assisting poor people has largely been criticised for creating a dependency syndrome amongst the beneficiaries. In certain cases, CCT programmes focus specifically on women, either in receiving the cash transfer or in meeting the conditions attached to the programme, or both. In this context, considerable debate exists in the scholarly literature about the effects of such CCT programmes on the situation and status of women, specifically in terms of possibly empowering women. While some scholars claim that these programmes enhance the human and financial assets of women, others argue that focusing specifically on women, and as care-givers within households, tends to reproduce gender-based inequalities and subordination. Since gender equality and female empowerment are now key issues in global development spheres, and at national levels, this thesis aims to contribute to literature on the effects of CCTs on gender and women’s empowerment. This is pursued by way of a gendered perspective on CCTs as a development methodology for empowering women with reference to Somalia, using the Puntland Technical Vocational Skills Training programme as a case study. This programme focused, in the main, on internally-displaced people in Somalia, with a particular emphasis on women in meeting the programme conditions (i.e. participating in a training programme) and in being the cash recipients. The study used both quantitative and qualitative approaches for data collection and analysis, focusing on sixty selected beneficiaries who participated in the Puntland Technical Vocational skills training programme in Somalia from 2013. The thesis examines the prevailing structures (including cultural dynamics and socio-economic factors) in Somalia which lead to women’s subordination, notably in the light of significant internal displacement because of war and conflict and the emergence of internally-displaced camps. On this basis, from a gendered perspective, there is a critical appraisal of the manner in which the Puntland CCT programme affected women’s subordinate status, including how it may have led to the restructuring of gendered relations at both household and community levels. In offering this appraisal with reference to the Puntland programme, the thesis argues that women’s subordination and, by extension, women’s empowerment, is multi-faceted, and that continuity and change along the dimensions of subordination is often uneven and contradictory. Further, as also demonstrated in the Puntland case study, women’s subordination (as a social totality) is not a totalising system, such that women regularly make use of gaps in the system as opportunities to enhance their well-being without confronting the totality of the system.
  • Full Text:
  • Date Issued: 2020

A genetic analysis of the species and intraspecific lineages of Dactylopius Costa (Hemiptera: Dactylopiidae)

  • Authors: Van Steenderen, Clarke Julian Mignon
  • Date: 2020
  • Subjects: Dactylopius
  • Language: English
  • Type: text , Thesis , Masters , MSc
  • Identifier: http://hdl.handle.net/10962/151491 , vital:39135
  • Description: The Cactaceae family comprises 15 genera and nearly 2000 species. With one exception, these are all native to the Americas. Numerous cactaceous species are invasive in other parts of the world, resulting in considerable damage to ecosystem functioning and agricultural practices. The most successful biological control agents used to combat invasive Cactaceae belong to the Dactylopius genus (Hemiptera: Dactylopiidae), comprising eleven species. The Dactylopiidae are exclusively cactophagous and are usually host-specific. Some intraspecific lineages of dactylopiids, often referred to as `biotypes', also display host-specificity, and are used to control particular species of invasive Cactaceae. To date, two lineages within Dactylopius opuntiae (`ficus' and `stricta'), and two within D. tomentosus (`cholla' and `imbricata') have been released in South Africa to control Opuntia ficus-indica and O. stricta, and Cylindropuntia fulgida and C. imbricata, respectively. The `californica var. parkeri' lineage is currently under consideration for release in South Africa for the control of C. pallida. Australia has already released these five lineages, and approved the release of an additional three in 2017; namely D. tomentosus `bigelovii', `cylindropuntia sp.', and `acanthocarpa x echinocarpa'. Many of the Dactylopius species are so morphologically similar, and in the case of lineages, identical, that numerous misidentifications have been made in the past. These errors have had serious implications, such as failed attempts at the biological control of cactus weeds. This thesis aimed to generate a multi-locus genetic database to enable the identification of the species and lineages in the Dactylopiidae family, and to test its accuracy. Seven species were included in the analysis, including two lineages within D. opuntiae and six within D. tomentosus. Genetic characterisation was achieved through the DNA sequencing of three gene regions; namely mitochondrial 12S rRNA and cytochrome c oxidase I (COI), nuclear 18S rRNA, and fragment analysis using two inter-simple sequence repeats (ISSRs). Nucleotide sequences were very effective for species-level identification, where the 12S, 18S, and COI regions showed 100%, 94.59%, and 100% identification accuracy rates, respectively. Additionally, the 12S and COI markers distinguished between half of the D. tomentosus lineages (`californica', `cholla', and `imbricata'), with identification accuracies of 100%. The `echinocarpa x acanthocarpa', `bigelovii', and `cylindropuntia sp.' lineages formed one clade. None of the DNA genetic markers showed a separation between the `ficus' and `stricta' lineages within D. opuntiae. Fragment analysis through the use of ISSRs provided higher-resolution results, and addressed this gap by showing a well-supported separation between the two lineages, and between wild populations collected in the Eastern Cape Province in South Africa. The identification accuracy of the `ficus' and `stricta' lineages was 81.82%. This is the first time that a method has been developed that can distinguish between these lineages. An additional component of this thesis was the creation of three user-friendly R-based programs to assist with: 1. ISSR data processing. 2. The identification of query Dactylopius nucleotide sequences relative to the gene databases created here. 3. A graphical user interface (GUI) version of the R package `SPIDER', which is useful for the assessment of the accuracy of genetic barcode data. A successful biological control programme relies on the correct identification of the agent in question, and so it is imperative that cactus biological control practitioners are able to distinguish between Dactylopius species and lineages in order to release the most effective ones onto target Cactaceae. The laboratory protocols reported, and data processing tools created here, have largely addressed this need and offer valuable practical applications. These include: 1. The flagging of potential new species, cryptic species, and lineages of dactylopiid species released as new biocontrol agents. 2. Validating the identifications made by taxonomists based on morphology. 3. Confirming to which species, and, where applicable, to which lineage, a field-collected sample belongs. 4. Identifying hybrids resulting from lineage crosses. Ensuring that the correct Dactylopius species are utilised for biological control will improve the control of invasive Cactaceae and protect biodiversity and agricultural productivity.
  • Full Text:
  • Date Issued: 2020

A Geochemical Comparison of Southern African Stromatolites and Stromatolite Pools

  • Authors: Dodd, Carla
  • Date: 2020
  • Subjects: Stromatolites
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: http://hdl.handle.net/10948/48235 , vital:40527
  • Description: Microbialite accretion takes place via either mineral precipitation, the trapping and binding of mineral and sediment grains, or a combination of the two. Recently, the geochemistry of carbonate deposits, including microbialites, has been used to reconstruct palaeoenvironments and infer biogenicity. Numerous modern stromatolite (layered microbialites) systems are located on the southern African coastline and are formed predominantly by mineral precipitation with minor detrital input. In order to better understand the environmental and biological processes influencing the formation of microbialites, the geochemistry of southern African coastalstromatolites is examined. This is done by a spatial comparison of the hydrochemistry as well as the major and trace element geochemistry of various coastal stromatolite systems. The influence of the underlying geology on the composition of the stromatolites forms a particular focus of the study. In addition, the effect of metazoans on the micro-fabrics and sediment incorporation into the stromatolite matrix is assessed. Finally, the trace element geochemistry of active, inactive, and ancient stromatolites is compared with a speleothem sample in order to test the validity of using trace elements as a means to determine biogenicity of deposition. Results show that the bulk geochemistry of the South African stromatolites is not a simple function of the associated bedrock lithologies, although certain parallels do exist. It was found that metazoans indirectly influence sediment incorporation by increasing porosity and thereby accommodation space for detrital input. Furthermore, trace element signatures could not be directly attributed to microbial influence in the deposition of the carbonates. Ultimately, this study provides valuable insights into the formation processes of the active South African stromatolites and the use of trace elements as a geochemical tool to investigate the evolution of life and determine past environmental conditions.
  • Full Text:
  • Date Issued: 2020

A holistic approach in understanding the effects of dietary protein sources on the growth and reproductive development of farmed abalone, Haliotis midae

  • Authors: Wu, Yu
  • Date: 2020
  • Subjects: Abalones -- Nutrition , Abalones -- Reproduction , Abalones -- Growth , Abalone culture , Haliotis midae -- Nutrition , Haliotis midae -- Reproduction , Haliotis midae -- Growth , Haliotis midae fisheries
  • Language: English
  • Type: text , Thesis , Doctoral , PhD
  • Identifier: http://hdl.handle.net/10962/167719 , vital:41506
  • Description: The combination of fishmeal and soya in the formulated feed of farmed South African abalone, Haliotis midae, not only improved abalone growth, but also the sustainability of the compound diets by reducing the reliance on fishmeal. However, the presence of soya produced larger gonads compared to those of abalone fed kelp or single-source protein diets. There is an increasing drive to control sexual maturation and reduce undesirable spawning events in farmed abalone. However, the reasons for the reported effects of soya inclusion on the reproductive development of farmed H. midae remain unresolved. The aim of this research was to use a combination of techniques to contribute to the understanding of the relationship between growth, reproductive and nutritional physiology of farmed H. midae fed diets of varying protein sources. These techniques included stable isotope analysis (SIA), fatty acid analysis, gonad histological assessments and haemolymph sexsteroid hormone analysis. The objectives were to examine the allocation of protein and nutritional components to somatic and reproductive tissues. This study also included the first attempt to investigate the role that sex steroid hormones play during gametogenesis. Abalone (40 – 50 g abalone-1) were fed one of four diets: either a single-source protein-based diet, i.e., (1) fishmeal-only (FM) or (2) soya-only (S), or a combination diet of (3) fishmeal-soya (FM S) or (4) fishmeal-sunflower meal (FM SM). Sampling occurred in 45-day intervals over one year. Dietary protein source had an effect on the growth of abalone, with enhancements in growth linked to the combination of fishmeal and a plant-protein source. The fishmeal ingredient was the most utilised protein source throughout the temporal changes in protein allocation into somatic and reproductive tissue, followed by soya and then sunflower meal. The mean whole- body mass of abalone was significantly influenced by an interaction between time and dietary treatment, with average whole-body mass changing differently over time between treatments (RM-ANOVA, F(24, 96) = 2.13, p = 0.005). Overall, abalone that were fed FM S had higher mean whole-body mass values than abalone that were fed the single-protein based diets, while abalone that were fed FM SM were similar to animals from all dietary treatments (RMANOVA, F(3, 12) = 5.75, p = 0.01). Male abalone had significantly higher gonad bulk index (GBI) values compared to females (RM-ANOVA, F(1, 24) = 49.03, p < 0.001) and this was independent of dietary treatment. Within each sex, female abalone fed the FM S diet (15.92 ± 1.88 mm3 g-1) had significantly higher GBI values than abalone fed S (9.76 ± 1.08 mm3 g-1), while abalone fed FM (11.96 ± 1.71 mm3 g-1) and FM SM (11.90 ± 0.80 mm3 g-1) were similar to abalone from all other dietary treatments (Tukey’s HSD, p < 0.05). Male abalone fed the FM S (21.59 ± 2.10 mm3 g-1) and FM SM diet (19.30 ± 2.63 mm3 g-1) had similar GBI values and they were significantly higher than in abalone fed the S diet (14.74 ± 1.27 mm3 g-1), while abalone fed FM S had significantly higher GBI values than abalone that consumed the FM diet (15.08 ±1.63mm3 g-1) ( Tukey’s HSD, p < 0.05). Although sunflower meal was poorly utilised, it produced similar overall growth to abalone that were fed the FM S diets. Yet, feed conversion ratio values were significantly lower for abalone fed FM S (1.30 ± 0.13) compared to those in the other three treatments, with ratios ranging from 1.65 – 1.72 over the one-year. The fatty acid compositions of the somatic and gonadal tissues were similar between treatments (PERMANOVA, p = 0.21), while fatty acid composition was influenced by sampling day, tissue type and abalone sex (PERMANOVA, p < 0.05). The essential fatty acids (EFAs) eicosadienoic acid and a-linolenic acid were present in abalone tissue, but they were not detected in the diets, suggesting the important role that an alternate food source (e.g. farmed abalone also had access to diatoms) may have played and the ability that H. midae may have in converting long-chain polyunsaturated fatty acids from C18 precursors. A change in the abundance of EFAs in the gonad tissue during highest and lowest GBI values suggested that arachidonic, eicosapentaenoic, g-linolenic and linoleic acid were important in females, while eicosapentaenoic, eicosadienoic and a-linolenic acid were important for male reproductive development. Dietary protein sources had an effect on the frequency distribution of maturity stages, where females that were fed FM S produced more ripe gonads and more males that were fed FM SM contained testes that showed signs of ripeness over the one-year study. Although dietary protein influenced the sex steroid concentrations in females and males, exhibiting fluctuations throughout the one-year period, no distinct pattern linked to gametogenesis were observed. The results from this study illustrate: (1) the importance of conducting laboratory studies when implementing SIA and mixing models in aquaculture nutrition; (2) conducting nutritional studies on mature, grow-out abalone; and (3) assessing the importance of naturally occurring diatoms in their diet and their contribution to growth and reproduction. The novel contribution of this research towards abalone nutritional physiology, the implications of these findings to industry as well as potential considerations for future studies were addressed.
  • Full Text:
  • Date Issued: 2020
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