Browsing Master's theses in international fisheries management by Title
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- Browsing Master's theses in international fisheries management by Title
Browsing Master's theses in international fisheries management by Title
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Korankye, Thomas (Master thesis; Mastergradsoppgave, 15-May-2008)[+][-]
Abstract: The work examines the knowledgeability of fisher-folks as well as determines the extent to which their livelihood influences their susceptibility to HIV/AIDS infection. By making specific reference to fisher-folks at Elmina fishing community in the Central Province of the Republic of Ghana, it particularly challenges the hypothesis that fisher-folks are highly vulnerable to HIV/AIDS infection. The analysis thereof draws on elements from risk, social cognition and diffusion of innovation theories that are deemed useful in a study of HIV/AIDS. The study finds that although awareness level among the fisher-folks is high, their understanding and knowledge of the facts of the epidemic are significantly low. It therefore argues that the prevailing knowledge gap could cause many of the fisher-folks to become victims of the epidemic. Also, irrespective of the fact that the Ministry of Fisheries has a direct oversight responsibility over the fisheries sector in Ghana, it has neither incorporated nor prioritized the fight against the spread of HIV/AIDS in its policy and programs. The study reveals that wide spread of the disease among fisher-folks could significantly deprive the country of fish food as a result of lost of fishers’ lives. It could also exacerbate poverty among the fisher-folks owing to increased outflow of funds and reduced funds inflow. As a result of the non-triviality of the epidemic to Ghana’s fisheries, this work calls for the development of new institutional structures that make it plausible to integrate the issue of HIV/AIDS in managing Ghana’s fisheries. Finally, the study ascertains that the culture of risk denial does not extend to other dimensions of the lives of fisher-folks at Elmina. They are risk lovers owing to the risky, mobility and hard nature of their job. However, they are risk averse in terms of their social life style. Being risk averse, the study further argues that the fisher-folks at Elmina are highly likely to adopt a positive behavioral change. More so, it becomes easier to reach them with HIV/AIDS preventive measures. As Rosenstock (1974) - one of the health belief model proponents - asserts, people who see themselves to be at risk of contracting diseases are most often than not likely to accept a preventative action. URI: http://hdl.handle.net/10037/1429 File(s) in this item: 1
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Colindres, Clarence Oliver Gonzales (Master thesis; Mastergradsoppgave, 13-Jun-2006)[+][-]
Abstract: Fishing continues to be the main source of income in the Pearl Lagoon Basin in Nicaragua. Currently the fishermen in the area have expressed growing concern about the shrimps stocks. Over the past years it has become increasingly clear that the fish and shrimp stocks are being exhausted, severely over-fished and experiencing a serious decline. This thesis examines the catch compositions (shrimps and by-catch) of three mesh sizes of the Cast net gear employed in the fishery through sampling during the months of July and August, as well as analyzes the current situation of the shrimp inside the lagoon through primary (interviews) and secondary (books, journals, articles, reports, etc.) data. The data samples of the experiment with the different mesh sizes identified in the thesis were analyzed using standard software applying a trouser trawl method to determine the selectivity curve. Single factor ANOVA tests were use to distinguish significant differences between lengths. Significant differences were also tested combining the three different mesh sizes applying the SPSS turkey multi comparison computer program model. The findings were discussed and compared with a previous selectivity study accomplished in the lagoon. The thesis concludes that gears with ½ inch mesh size were vulnerable to the species during these months by retaining low weight and smaller length shrimp compositions (70% of the capture is between 5 and 8 cm total length). 1 inch and 1½ inch mesh sizes showed a general improvement in the selective performance of the gear (approximately 90% of the captured shrimps were between 11 and 14 cm). The main secondary findings show that local people are employing small gear mesh sizes in the lagoon, especially those whose sustainability livelihoods are significantly threatened with very few opportunities of survival; most obvious those who live in the more remote areas. URI: http://hdl.handle.net/10037/313 File(s) in this item: 1
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Sequeira, Karen M. Joseph (Master thesis; Mastergradsoppgave, 31-May-2002)[+][-]
Abstract: Development is a term that evokes powerful images. It speaks to the collective aspiration of the people for a life of meaning and dignity. It inspire the hope to achieve what develop countries have achieved and what the poor may one day obtain. This thesis is the first study of Rama indigenous people focussing and its fishing activity in the community of Rama Cay. It examines the fundamental of the incongruities that has kept back the development of the fishing sector in Rama Cay. The problems that have concurred on the appropriate use of the resource such as transportation, processing methods and marketing. This study combines secondary sources with fieldwork notes based on interviews and discussions with members in and out of the community that are involved with the fishery. It provides information on type of fishing gears and boats in numbers and percentages. Women participation and how the cooperative system and problems related with processing activities can be improved. It is observe that trade offs at community level can be relatively different in comparison of the national and regional level. This trade offs happen because of pursuing multiples objective that cannot be fulfill at full extent. Therefore, Nicaragua has participated in many fisheries development project that evidently show that fish product from artisanal fishers can be sell to local market and the industrial production for export markets. Co-management is one of the alternatives that Nicaragua itself should develop to the national extent and also regional, so that a small community such as Rama Cay can also be include in the management system. URI: http://hdl.handle.net/10037/315 File(s) in this item: 1
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Falk-Petersen, Jannike (Master thesis; Mastergradsoppgave, 28-May-2004)[+][-]
Abstract: Barents Sea ecosystem is limited. Due to the information available on benthos the Ecopath model of Sørfjord, Northern Norway, was used to investigate possible trophic changes with introduction of king crab to the model. A literature study of the king crab was conducted to find information on diet, mortality, consumption rate and other life history parameters required by the model. A short introduction to biological invasions was also included. The Ecopath with Ecosim software was used as a modelling tool to investigate factors allowing for growth of king crab as well as potentially controlling their biomass. Possible food-web effects of king crab invasion on the Sørfjord ecosystem was also investigated. Knowledge gaps identified through the exercise and management implications were discussed. A biomass of 1.2 t km-2 small and 2.8 t km-2 large king crabs was introduced to the Sørfjord model. The modelling exercise indicated that a resource opportunity, in the form of benthic production, could allow for growth of the king crab in Sørfjord. Mammals could have a negative impact on large king crab abundance through predation, while fish predation is expected to have minor effects on king crab biomass. King crabs are expected to have a negative effect on the benthic community through predation, but limited impact on the pelagic community. King crab abundance could be controlled by fishing large king crabs. A change in fishing of other commercial fish species is not expected to have an impact on king crab biomass. Knowledge gaps identified from this exercise includes population structure, biology and food preference of king crab. Production and interactions within the native benthic community should also be investigated further to understand possible impacts of king crab invasion. URI: http://hdl.handle.net/10037/316 File(s) in this item: 1
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Pettersson, Lena (Master thesis; Mastergradsoppgave, May-2009)[+][-]
Abstract: Education is frequently used within visitor management, as a soft approach to fulfil different objectives e.g. increase awareness, alter behaviour. This thesis attempts to shed some light regarding how it can be used to reduce direct ecological impacts. For such to take place the tool needs to result in behavioural change(s) i.e. reduce destructive actions. In many situations though, education is not as a sufficient motivator for such. This might imply that the “win-win” situation, main reason for the tool’s stated efficiency, is seldom reached. Main emphasis of the thesis is to centralize this problem. The explorative approach has led to findings, which will hopefully aid future visitor management. These include: initial explanation of varying efficiency of the tool(s) e.g. destructive actions lead to benefits, how can educational tools alter the benefits; and ultimately zoning the need for educational tools. It also questions the routine manner of incorporating imprecise objectives within management e.g. need for education, and change visitors’ behaviour, which will solely lead to resource loss. Many models link education with behavioural change. Few, if any can be directly used as a practical tool within visitor management. Since one cannot expect managers to grasp the jungle of existing theoretical frameworks, this thesis initiates the process of developing such. Second part of the thesis applies all prior findings to a case study location: Con Dao, Vietnam. Current use of educational tools is very limited, and since extensive tourism development is about to take place in this archipelago; improved visitor management is essential. Fieldwork revealed situations where educational implementations would benefit management; and in-depth interviews provided insight to visitors’ opinions and experiences regarding in-formal education on Con Dao. Ultimately, recommendations for future use of educational tools are presented. URI: http://hdl.handle.net/10037/1999 File(s) in this item: 1
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Kugathaj, Subramaniam (Master thesis; Mastergradsoppgave, 30-May-2005)[+][-]
Abstract: Three experiments were performed during spring 2004, to develop a method to elevate the blood plasma level of 11-ketotestosterone (11-KT) in male brood stock of spotted wolffish Anarhichas minor, and to study the effects of 11-KT on sperm production. Intraperitoneal implantation of silastic capsules containing 11-KT - coconut butter mixture and 11-KT - sesame oil mixture and intramuscular injection of 11-KT – propylene glycol mixture were tested. Blood plasma 11-KT levels were quantified by radioimmunoassay. Low and medium doses (c. 0.09 mg/kg and c. 0.18 mg/kg) of 11- KT-coconut butter mixture administered in silastic capsules did not elevate the plasma 11-KT levels. High dose (c. 0.37 mg/kg) of 11-KT – coconut butter mixture gave an increase (6.48 ± 1.89ng/ml) of about 3 times pretreatment level (1.83 ± 0.36 ng/ml) for one week. 11-KT- sesame oil mixture (1 mg/kg dose) elevated the plasma 11-KT levels (22.58 ± 4.69 ng/ml) compared to the controls (14.98 ± 3.45 ng/ml) for one week. Silastic capsule implants did not maintain the elevation more than one week irrespective of dose or vehicle (coconut butter, sesame oil). Intramuscular injection of 11-KT dissolved in propylene glycol (1mg/kg) elevated plasma 11-KT (99.16 ± 56.04 ng/ml) to about 12 times the level of the controls (7.44 ± 2.04 ng/ml), and was identified as a more effective method than silastic capsule implantation. Sperm production was studied by examining milt volume, spermatocrit, milt pH and motility of sperm. 11-KT treatment with intramuscular injection significantly increased milt volume. Mean milt volumes in treatment and control groups were 14.26 ± 4.2 ml and 4.73 ± 2.8 ml respectively. 11-KT treatment had no significant effects on spermatocrit, which was very low (2 -4 %) in both treatment and control fish. Total sperm cell volume in milt was significantly high in treatment group. There were no significant differences in milt pH and sperm motility between 11-KT treatment and control groups. The results indicate that 11-KT induces the spermatogenesis but does not influence the motility of sperm. URI: http://hdl.handle.net/10037/329 File(s) in this item: 1
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Hammer, Maria (Master thesis; Mastergradsoppgave, 11-Dec-2006)[+][-]
Abstract: This thesis focuses on the Cod Recovery Plan that was implemented in the Irish Sea in 2004. The plan was constructed within the Common Fisheries Policy, and applied to several European cod stocks that was fished unsustainably. It involved a system of measures including drastic reduction in TACs, closed spawning area, technical conservation measures and effort restriction in the form of “Days at Sea.” This was not new to the fisheries in this area since the three former measures had been applied from 2000 as ICES gave warnings about the poor state of this particular stock. The implementation process has been characterised by conflicts, horse-trading and lack of evaluation. For many in the industry the measures have been draconian, others will claim they should have been tougher. Many differing but entangled factors and interests are involved and together with a high degree of complexity and unclear objectives the lack of legitimacy may be undermining the plan. This work sets out to evaluate the implementation process of the Cod Recovery Plan URI: http://hdl.handle.net/10037/711 File(s) in this item: 1
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Ko, Iwan Setiyono (Master thesis; Mastergradsoppgave, 08-Jun-2006)[+][-]
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Huynh, Mai Thi Xuan (Master thesis; Mastergradsoppgave, May-2007)[+][-]
Abstract: The consumption of catfish in Vietnam has not grown enough to match their increased production. The objective of this study is to explore the factors that influence the decision process of catfish consumers in Vietnam. The findings provide information for the Vietnamese catfish industry to better attract more domestic consumers to eat catfish. This study seeks to address its objective by examining the relationships that exist between the experiences, perceptions of product attributes, preference, market constraints, and consumption levels of consumers for catfish products. Non-catfish consumers are also investigated. Data collected in the two biggest cities in Vietnam is analyzed by using multivariate techniques based on a partially-recursive model. Factors such as age, region, ease of preparation, perceptions of catfish taste, odour, and fat along with beliefs that catfish are available, safe and inexpensive are found to significantly influence the decision-making process. URI: http://hdl.handle.net/10037/1002 File(s) in this item: 1
thesis.pdf (216.6Kb) -
Bantikova, V. Elena (Master thesis; Mastergradsoppgave, 14-Jun-2002)[+][-]
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Belandria Ojeda, Alexa (Master thesis; Mastergradsoppgave, 25-May-2007)[+][-]
Abstract: When conducting social research in the four communities located in North-East Venezuela, it was understood through the course of communication that there was a very important issue affecting, in one way or another, the development of the sardine fishery: Governance. New formal fisheries institutions have been established since 1999 related with the election of the president Hugo Chavez in 1998. When studying governance it is the belief of the researcher that political principles and values give structure to the system. On that account, the question of how the existing fisheries governance has been formed as a result of the socio-political reforms taking place in Venezuela since 1998 becomes central. The State remains as the principal actor and controller of the interactions. Therefore, special attention is paid to the interactions between the State and the civil society, including the market. The organization of cooperatives and the supply of financial resources for fish extraction represent the base of the State’s programs. The future of governance in Venezuela is unclear, but signs that Venezuela might be moving towards “cooperativism” with high participation of the State exist. Nevertheless, the system can have its pitfalls. For that reason, the construction of partnerships between the State and cooperatives is a strategic alliance that might be successful if the relation is based on trust, equality, and mutual understanding and obligations. URI: http://hdl.handle.net/10037/999 File(s) in this item: 1
thesis.pdf (1.515Mb) -
Nguyen, Thong Ba (Master thesis; Mastergradsoppgave, 20-May-2005)[+][-]
Abstract: In the period 2001-2004 four bottom trawl surveys were carried out in the Gulf of Tonkin to investigate the aquatic stocks in the Vietnamese sector (67,370km2). The Gulf has tropical characteristics and great diversity of commercial species, but lately fishing pressure seems to have grown excessively. The swept-area cruises followed a stratified random design, with a fixed station grid imposed on four depth intervals between 0 and 100m, and internationally accepted survey protocols. Three commercially important indicator species which differ in life-history and habit were selected for appraisal using commonly accepted single-species metrics. The methodology for data treatment included spatial statistics (kriging) to describe seasonal trends in distribution, and non-parametric re-sampling (bootstrapping) of station data combined with maximum likelihood analysis of maturation curves to estimate both total and spawning standing biomass. Chinese squid (Loligo chinensis Gray 1849), a small pelagic resource with very high turnover rate, showed a marked decline in standing biomass, from 16,000 tones in 2001 to 3,000 tones in 2004 (CV 27-14%). Remarkably, spawning biomass remained at stable 1,000 tones, and large squid (13cm ML and above) dominate the population. The Greater lizardfish (Saurida tumbil (Bloch, 1795)), a very valuable, and slow growing, demersal species, showed stable levels of total biomass, at around 3,000 to 5,000 tones (CV 13-25%). However, spawning biomass showed a marked 22% decline to 732 tones in 2004, despite a decrease in the maturation size, which might be a compensatory mechanism. Simultaneously, most of the stock was comprised of fish in the 11- 24cm range, and this is a marked constriction from the original 5-35cm range. The Largehead hairtail (Trichiurus lepturus Linaeus, 1785), a large pelagic, has become the major commercial pelagic species in the South China Sea. In the Gulf the total biomass declined from 3,600 to 2,600 tones (CV 24- 29%), but a highly unreliable estimate (CV 50%) raises it to 15000 tones in 2004. The estimates of spawning biomass showed equal development, varying from 2,500 tones in 2001 to 1,500 tones in 2003, and raising to 4,000 tones in 2004. Largehead hairtail also shows a marked constriction of sizes in 2004, and the largest sizes are now about 1/3 of L∞. Although the squid showed a permanent coastal affinity (20-30m deep) and is exposed to the extremely large and un-controlled coastal fleet year round, it seems to have the best potential for recovery. The Largehead hairtail and the Greater lizardfish showed coastal affinity during the NE monsoon but moved to offshore grounds in the SW monsoon. Management of these transboundary populations is not sole responsibility of Vietnam and requires co-ordination with China in the South China Sea. URI: http://hdl.handle.net/10037/242 File(s) in this item: 1
thesis.pdf (4.346Mb) -
Msigwa Chando, Catherine (Master thesis; Mastergradsoppgave, 31-May-2002)[+][-]
Abstract: Women play crucial roles in fisheries, particularly on the post harvest level. Despite this, they are noticeably absent from the discussion of many development programmes in fisheries. The focus is mainly on the needs and interests of men, neglecting women. Women are hardly involved in the planning and decision making or in the implementation and management of the projects. Therefore this study examined the importance of involving both women and men equally during planning of the fishery projects. The study tried to relate to different theories on women in development (WID), gender and development (GAD) and women, environment and alternative development (WED). A total of 88 persons in connection with Mbegani Fisheries Development Centre (Mbegani FDC), Mafia Island Marine Park (MIMP) and with people in villages where these institutions have been involved: Mlingotini and Bagamoyo nearby Mbegani FDC and Juani and Jibondo at Mafia. The findings show that the involvement of women and men in the planning of the projects varied. At Mbegani FDC a female orientation has been weak and womens participation in planning have been lacking from the very beginning and until to day. The same can be said about the projects in Bagamoyo and Mlingotini although the projects were aimed at women and sometimes both at men and women. However, women have participated in the implementation processes. In the projects related to MIMP, women have been integrated in the planning process from the very beginning and at all levels as a result of planned actions. Women are members in steering committees and leaders of their groups. There is a special gender officer in the MIMP structure as well as in the villages. Women have also been well trained. In this way their income generating projects are successful and reflect the sustainability of the resources. Some of the women have also involved themselves in other kind of development activities. I have therefore concluded that awareness of womens needs and participation of women and men in the planning process seem crucial for the success of the fisheries projects. URI: http://hdl.handle.net/10037/317 File(s) in this item: 1
thesis.pdf (657.7Kb) -
Wang, Shou (Master thesis; Mastergradsoppgave, 29-May-2009)[+][-]
Abstract: In teleost fish, gill plays an important role of controlling ion transport mechanisms for the maintenance of ion- and osmoregulatory homeostasis in both fresh water and seawater. Leptin mRNA expression has been found in several fish species, and was also found in gills of Arctic charr (Salvelius alpinus) in this study. However, no study has been reported on the function of leptin in the gills of fish. The question arise f Leptin may have some function related to ion- and osmoregulation in fish gills. In this study, Arctic charr were sampled during their smolting period in freshwater. Seawater tolerance, as well as gill Na+, K+-ATPase activity of the fish increased from winter to spring in these fish, showing that they smoltified. There was no change in gill leptin mRNA expression during and after smolting in the fish acclimated to freshwater and hence, the results gave no evidence for a paracrine role of leptin in the regulation of the adaptational changes in gill during smolting. It can not be excluded, however, that leptin may be involved in the changes taking place in the gill in association with seawater exposure, and future studies must include sampling of gill tissue, and analyses of leptin mRNA expression after seawater transference. URI: http://hdl.handle.net/10037/2004 File(s) in this item: 1
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Dyspriani, Polite (Master thesis; Mastergradsoppgave, 29-May-2007)[+][-]
Abstract: Shrimp world production in the last few years has shown very high growth rates. It is marked by an increasing of production volume, and by shifting from capture to aquaculture fisheries within the production system. This has occurred mostly regarding to the brackish water pond. For some years, the government has had to face hard choices in order to ensure shrimp aquaculture developed sustainable. The desire and temptation to pursue the excessive development of shrimp production as a source of foreign currency often conflicted with concerns for ecosystem health, social justice, food safety, livelihoods and food security. The Fisheries Revitalization Program is one of the main driving forces behind establishing a governance system that allows the stakeholders to play an effective role in managing fisheries sustainable. The program utilizes political support to encourage sustainable livelihood by creating economic growth, providing job and alleviating poverty. The Fisheries Revitalization Program focuses on the development of three important economic commodities, namely shrimp, skipjack and seaweed. The study focuses on the shrimp revitalization program, by using the governance concept to analyze how the mechanisms and effects of the program so far. The findings are the contributions and commitments from the three societal institutions (state, market and civil society) needed to play roles in the shrimp governance system, and local institution needs to be developed. Key words: governance, revitalization, sustainable, local institution URI: http://hdl.handle.net/10037/1008 File(s) in this item: 1
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Wellem, Xolela (Master thesis; Mastergradsoppgave, 29-May-2009)[+][-]
Abstract: Foreign fishing vessels are landing catches in South African ports, however, there are number of issues, procedures and persons involved in the process to facilitate those vessels into port. So this study concerns understanding and law implications as diversified from the actual practicing of the law. The legal analysis boils down to textual analysis to see whether national achievements are more or less well bestowed within the limits of the international - as well as national law in communication, co-operation and coordination of what is the laws efforts to control overfishing, black listed and other illegal, unreported and unregistered fishing. URI: http://hdl.handle.net/10037/1998 File(s) in this item: 1
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Hulse, Kirkman Joe Roe (Master thesis; Mastergradsoppgave, 30-May-2005)[+][-]
Abstract: This thesis an effort is made to present the indigenous knowledge of marine ecosystems in the communities of Sandy bay (Miskito) and Punta Aguila (Rama) of Nicaragua. The aim is to identify and show how these fishing communities are using and transmitting their knowledge for resource harvesting and management. As indigenous people are facing changes in their daily life; conflict of resources use, land tenure, variation in the ecosystem and the environment in which they live their knowledge change and the communities to adopt new methods of management. The people Punta Aguila and Sandy Bay harvest lobster, turtle, fish from the sea. They also do agriculture activities for their subsistence. My research problem focuses on their knowledge of the marine ecosystem and whether their knowledge is used for management purpoes. How are these perceptions, ideas and beliefs shared within the communities? The theories of indigenous knowledge is the theoretical framework for this thesis . The methods used to collect primary data during the two months of fieldwork in the two communities, undertaken in July and August, 2004 were; • structured, intensive interviews with fishermen and –women who live from the sea , • conversations on tape recorder, • workshop and groups discussion to identify the different fishing grounds • observation of activities and daily life in the communities . The presentation of the primary data is mostly of qualitative character. The material presented shows that these indigenous communities do have extensive knowledge of the ecosystem. Despite their knowledge, and in spite of the management systems introduced by the government and other institutions, the marine resources are threatened with overfishing. I also found that outside fishing operations were seen as an intrusion and as a threat to the natural resources. While the communities may have knowledge relevant to the management of the natural resources and the balance of the ecosystem, management authorities pay little attention to such knowledge. This knowledge has been a way of interacting with nature and the environment for improving their lives and bringing harmony with their God. URI: http://hdl.handle.net/10037/314 File(s) in this item: 1
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Nguyen, Thanh Binh (Master thesis; Mastergradsoppgave, 02-Jun-2003)[+][-]
Abstract: This paper presents the importance, the state of affairs and the development strategies of the state-owned enterprises in the Fishery sector of Vietnam. The purpose is, firstly, to review state-owned enterprise reform literature of relevance to Vietnam. Secondly, the reform of state-owed enterprises in Vietnam particularly in the Fisheries Sector is reviewed to determine the important issues and problems as well as the its role in the renovation process of Vietnamese fisheries state-sector enterprises. Finally, the opportunities, conditions, and obstacles for the reform are identified in the sector economic development. The review of the state-owned enterprise reform in Vietnam suggests that the diversification of ownership is one of the most important factors affecting successes of the economic reform. There is a need for accelerating equitisation of state-owned enterprises to have more involvement of private sectors. In the Fisheries sector, inefficient operations of fisheries state-owned enterprises have imposed financial burden on the national budget. Data of financial performance of fisheries enterprises including state general corporations and equitised companies is employed to observe changes of their profitability, operating efficiency, and leverages. Nonetheless, restricted accessibility of records of state-owned enterprise financial performance caused some limitations of analysis of financial and economic performances. The empirical result shows that equitised companies have been operating much more efficiently than preequitisation. The state capitals are being invested with higher returns and more significantly, budgetary burden was removed. Some obstacles such as incomplete and irrelevant regulations and lack of broad-based consensus of equitisation have accounted for lags of the reform process. It is necessary to create a more effective policy and legal frameworks, more incentives for actors participating in the process and more stable macroeconomic environments. URI: http://hdl.handle.net/10037/333 File(s) in this item: 1
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Amoako, Mary (Master thesis; Mastergradsoppgave, 08-Jun-2006)[+][-]
Abstract: A survey was carried out to investigate the prevalence and mean intensities of ectoparasites infestation on the gills and skin mucus of Nile tilapia (Oreochromis niloticus) in some selected fish farms in the Ashanti region of Ghana. Pond water quality was also determined. Oral on-farm interviews on pond management practices were carried out on the farms. The results obtained revealed three types of ectoparasites namely; Trichodina sp., monogeneans and Tetrahymena sp. of which the first two were prevalent on most farms. Tetrahymena sp. was found on one farm. The physico-chemical parameters and management practices were very similar in all farms. There were no strong relationships between ectoparasite prevalence and intensity and the physico-chemical properties and the management practices on the farms. the ectoparasites occurrences in infected farms might have been due to a chance effect. The general low prevalence and intensities of ectoparasites recorded in the infected farms is an indication that the Nile tilapia has a biotic mechanism which might have enabled it to reduce the growth rate of ectoparasite intra-population. The ectoparasites do not seem to pose a threat for the aquaculture industry in the Ashanti region as observed in this study, but measures have to be taken to secure the industry from unforeseen incidents, for instance in the introduction of non-endemic parasite species in the future. URI: http://hdl.handle.net/10037/297 File(s) in this item: 1
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Sønvisen, Signe Annie (Master thesis; Mastergradsoppgave, 22-May-2003)[+][-]
Abstract: Resource management in the coastal zone involves a large number of stakeholders and resource users, from traditional fishermen and recreational housing owners to state and municipal government. The aim of this study is to show how spatial scarcity in Norwegian aquaculture is not solely a technical definition, but scarcity also depends upon the social context in which it operates. That is, what has influenced Norwegian aquaculture policy in spatial terms? This question is answered by looking at how allocation of space has developed from the early 1970s and to the present, what actors were involved, what arguments did they use and what was the spatial outcome of the chosen policies. Through a literature review, I have shown how discourses of regional policy, industrial policy, environmental policy and health policy have affected the spatial allocation of aquaculture licenses in the past. Moreover, I show that these discourses are a part of a larger coastal zone management discourse, which is becoming increasingly popular. Thus, scarcity of space in aquaculture is defined within the discursive framework that it operates. URI: http://hdl.handle.net/10037/324 File(s) in this item: 1
thesis.pdf (683.0Kb)
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