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Dissertations / Theses on the topic 'Freshwater fishes - Effect of water pollution on'

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Published: 4 June 2021

Last updated: 1 February 2022

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1

Carrier, Roxie. "Temperature Tolerance of Freshwater Fish Exposed to Water-Borne Cadmium." Thesis, North Texas State University, 1987. https://digital.library.unt.edu/ark:/67531/metadc504077/.

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Lethal toxicity values (96 h LC50; mg Cd/L) for the test species were similar: Lepomis cyanellus, 11.52; Notropis lutrensis, 6.62; Pimephales promelus, 3.58. However the effects of cadmium concentration and exposure time on temperature tolerance varied between species. Neither cadmium concentration nor exposure time had a significant effect on the CTM of green sunfish. Both cadmium concentration and exposure time had a significant effect on the CTMs of red shiners and fathead minnows. By day 10 mean CTMs were 2.3 t- 4.5 C (red shiners) and 4.2 to 5.7 C (fathead minnows) lower than control CTM.

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2

Mpherwane, Salome Kedibone. "An investigation into the allozyme genetic variation patterns among populations of freshwater fish from different river systems of Southern Africa." Thesis, University of Limpopo (Turfloop Campus), 2011. http://hdl.handle.net/10386/910.

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3

Vereskuns, Gastons. "Chlorinated fatty acids in freshwater fish and some biological effects of dichlorostearic acid /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 1999. http://epsilon.slu.se/avh/1999/91-576-5717-3.pdf.

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4

Liang, Yan. "Reclamation of wastewater for polyculture of freshwater fish." HKBU Institutional Repository, 1997. http://repository.hkbu.edu.hk/etd_ra/137.

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5

Warwick, Oliver William Tindle. "The use of a biomarker to assess the effect of xenobiotic exposure on the freshwater invertebrate Gammarus pulex." Thesis, University of Sheffield, 1997. http://etheses.whiterose.ac.uk/10191/.

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Contamination of freshwaters is of concern because of its effect on ecosystem health. The effect of contamination can be assessed at all levels of biological organisation, from the ecosystem level to the molecular level. At the biochemical level, enzymes that are involved in the detoxification of organic chemical contaminants are useful as markers of contaminant exposure as they are often one of the first systems to respond to chemical exposure. Furthermore, changes in the activity of these enzymes may be indicative of effects at higher levels of biological organisation. In this study, the use

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6

White, Jessica C. "Comparative Bioavailability of Dietary and Dissolved Cadmium to Freshwater Aquatic Snails." Thesis, University of North Texas, 2003. https://digital.library.unt.edu/ark:/67531/metadc4351/.

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Heavy metal bioaccumulation in aquatic organisms may occur through direct or indirect uptake routes. Research indicates that the significance of uptake route varies with contaminant and organism exposed. The relative importance of different metal sources in aquatic systems was investigated by exposing freshwater snails to dietary or dissolved sources of cadmium. Snails were exposed to control, contaminated food only, contaminated water only, and contaminated food and water treatments. During the 15-day exposure, samples were taken to determine Cd concentration in snail soft tissue, snail sh

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7

Ubilava, Mariam. "Effect of winter storm on water quality and fish toxicity the Duwamish and Nisqually Rivers /." Online pdf file accessible through the World Wide Web, 2007. http://archives.evergreen.edu/masterstheses/Accession86-10MES/Ubilava_M%20MESThesis%202007.pdf.

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8

Naigaga, Irene. "Bioaccumulation and histopathology of copper in Oreochromis mossambicus." Thesis, Rhodes University, 2003. http://hdl.handle.net/10962/d1005077.

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Cu is one of the most toxic elements that affect fish populations when the fish are exposed to concentrations exceeding their tolerance. To investigate the effects of elementary Cu on aspects of bioconcentration, histology and behaviour, O. mossambicus were exposed to 0 and 0.75 ± 0.20 mg/l of Cu for 96 hours (short-term study), and 0, 0.11 ± 0.02, 0.29 ± 0.02, and 0.47 ± 0.04 mg/l of Cu for 64 days (longterm study) under controlled conditions in the laboratory. For the long-term study fish were sampled for gills, liver, and kidney Cu accumulation analysis after 1, 32 and 64 days of exposure a

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9

DiAngelo, Constance Rose. "Energy levels and anaerobic endproducts in the brains of two species of teleost fish at death in anoxic water." Thesis, Virginia Tech, 1986. http://hdl.handle.net/10919/45641.

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<p>The brain of fish, as in other vertebrates, is responsible for many functions basic to life and is also thought to be an anoxia-sensitive tissue. Therefore, during anoxia, the maintenance of energy within the brain is of paramount importance to the survival of the animal. Studies concerning energy levels and storage and the use of anaerobic metabolism in fish brains following exposure to anoxia are lacking.</p> <p> Rainbow trout (<u>Salmo gairdneri</u>) and brown bullhead catfish (<u>Ictalurus nebulosus</u>) occupy ecologically distinct habitats. Their tolerance of anoxia is diffe

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10

Trudel, Marc. "Bioenergetics and mercury dynamics in fish." Thesis, McGill University, 1999. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=36723.

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This research focuses on the development, evaluation, and application of a mercury (Hg) mass balance model for predicting the accumulation of Hg in fish. This model requires accurate estimates of Hg elimination rate by fish and feeding rates to adequately predict Hg concentration in fish. An empirical model was developed to estimate Hg elimination by fish using data obtained from published experiments. This analysis showed that Hg elimination rate was overestimated in short-term experiments, positively correlated to water temperature, negatively correlated to body size, and that the eliminatio

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11

Richards, Virginia L. (Virginia Lynn). "Reciprocal Influences of Temperature and Copper on Fathead Minnows (Pimephales promelas)." Thesis, University of North Texas, 1994. https://digital.library.unt.edu/ark:/67531/metadc278235/.

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Acclimation temperature had a significant effect on the lethality of copper to fathead minnows in replicated 96-hour lethality tests. Lowest median lethal copper concentrations (LC50) were recorded at 12 and 22°C, with LC50s at 5 and 32°C at least 140 μg/1 higher. This research found LC50 copper concentrations in the 300 to 500 μg/1 range and a polynomial relationship between LC50s and acclimation temperature. Following a 24-hour exposure to three sublethal concentrations of copper, critical thermal maxima (CTMax) were tested in minnows acclimated to four temperatures. Sublethal exposure to co

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12

Mercer, I. R. Geoffrey. "The effect of petroleum hydrocarbons on a freshwater environment, the Spring Gulch Wetlands, Canadian Forces Base Goose Bay, Labrador using pearl dace (Margariscus (Semotilus) margarita) as an environmental indicator." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ62400.pdf.

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13

Payne, Holly Ann. "DEVELOPMENT OF A METHOD FOR POLIOVIRUS DETECTION IN FRESHWATER CLAMS (COLORADO RIVER, CORBICULA FLUMINEZ)." Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/275315.

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14

Lonergan, Sean P. "Macroinvertebrate community responses to acidification : isolating the effects of pH from other water chemistry variables." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=68205.

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The effect of lake acidification was evaluated, in the field, in terms of its impact on both the structural and functional composition of the macrozoobenthic community. The littoral macrozoobenthic community and water chemistry of 45 Canadian Shield lakes was sampled. The water chemistry variables sampled included pH, total dissolved calcium, conductivity, and dissolved organic acid (measured as colour). Partial canonical correlation analysis and partial regression analysis were used to identify those components of the macrozoobenthic community that most directly reflected pH variability. This

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15

Hemming, Jon Michael. "Evaluation of the Use of the Bivalves Ischadium recurvum Rafinesque, 1820 and Corbicula fluminea Muller, 1774 as Biological Indicators of Relative Water Quality in Terms of Growth and Upper Temperature Tolerance." Thesis, University of North Texas, 1997. https://digital.library.unt.edu/ark:/67531/metadc278827/.

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Growth of mussels under laboratory conditions was examined under various food regimes in different water types and temperatures. Growth was less than would be useful as an indicator and comparisons with field exposures were of minimal value. The effects of organophosphates on bivalves were examined via toxicity tests, tissue concentration, and by controlling exposure through the use of physical constraints. Upper temperature tolerance of both bivalve species was examined with respect to different acclimation temperatures and organophosphate exposures. Deviations from control exposures occurred

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16

Johnson, Adam Nicholas. "Toxicological Comparison of Heavy Metal Salt and Semiconductor Nanoparticle Exposure in Zebrafish (Danio rerio)." Fogler Library, University of Maine, 2007. http://www.library.umaine.edu/theses/pdf/JohnsonAN2007.pdf.

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17

Slaughter, Andrew Robert. "The refinement of protective salinity guidelines for South African freshwater resources." Thesis, Rhodes University, 2005. http://eprints.ru.ac.za/159/.

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18

Balestri, Máira Renata Dias. "Avaliação da contaminação de Poecilia reticulata e Hypostomus ancistroides por elementos-traço na Bacia do Ribeirão Cafezal (Município de Rolândia - PR)." Universidade Tecnológica Federal do Paraná, 2015. http://repositorio.utfpr.edu.br/jspui/handle/1/1902.

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A qualidade da água é um fator importante para o bem-estar do ser humano, e equilíbrio dos ecossistemas naturais. Com o aumento populacional e a consequente industrialização, se intensificou a produção de esgoto doméstico e de efluentes industriais, os quais podem conter metais e acentuar a poluição ambiental. Alguns elementos-traço são considerados essenciais para o desenvolvimento e manutenção dos organismos, porém, se forem ingeridos em concentrações acima das recomendadas, podem ser tóxicos. O objetivo desse estudo foi avaliar o grau de contaminação de duas espécies de peixes (Poecilia ret

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19

Arnold, Winfred R. 1960. "Effects of Water Quality, Instream Toxicity, and Habitat Variability on Fish Assemblages in the Trinity River, Texas." Thesis, University of North Texas, 1989. https://digital.library.unt.edu/ark:/67531/metadc332226/.

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The Trinity River flows through the Dallas-Ft. Worth Metroplex in north central Texas where it receives effluents from numerous point sources including seven large regional wastewater treatment facilities. Historically, the Trinity River has been impacted by massive wastewater loadings which often constitute > 80% of the total river discharge during low flow periods. Normally, high mass loadings correspond to the summer months, compounding the effects of a naturally stressful period, characterized by high temperatures and low dissolved oxygen concentrations. Samples from 12 stations were col

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20

Downing, Gavin. "The effect of changes in bleached kraft pulp mill effluent on plasma cortisol of fish /." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=68170.

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In a three year study, the applicability of the cortisol response to capture as a biomarker of the health of fish from areas chronically exposed to pollution was assessed. Northern pike (Esox lucius) and yellow perch (Perca flavescens) captured from an area contaminated by bleached kraft pulp mill effluent (BKME) were initially found to be incapable of elevating their blood cortisol concentration to reference levels. Following a reduction of the amount of absorbable organochlorines (AOX) in the BKME, fish downstream of the mill regained their normal cortisol response to capture. The time frame

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21

Kwan, Sai-ping, and 關世平. "Heavy metals in Hong Kong rabbitfish (Siganus canaliculatus)." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B31221038.

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22

Odume, Oghenekaro Nelson. "An evaluation of macroinvertebrate-based biomonitoring and ecotoxicological assessments of deteriorating environmental water quality in the Swartkops River, South Africa." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1013156.

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Freshwater resources are increasingly subject to pollution because of escalating human population growth, accompanied by urbanisation, industrialisation, and the increased demand for food. Consequently, freshwater quality, and aquatic ecosystem structure and function have been severely impaired. The Swartkops River, which drains an urbanised and industrialised catchment in the Eastern Cape of South Africa, is no exception. An integrated environmental water quality (EWQ) approach is needed to measure the impacts of deteriorating water quality on its aquatic ecosystem structure and function to s

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23

Moraes, Paula Martin de [UNESP]. "Fracionamento de mercúrio em amostras de tecido muscular de peixes coletados na área de influência do AHE Jirau - Bacia do rio Madeira utilizando estratégias metaloproteômicas." Universidade Estadual Paulista (UNESP), 2014. http://hdl.handle.net/11449/123974.

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Made available in DSpace on 2015-06-17T19:34:28Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-01-21. Added 1 bitstream(s) on 2015-06-18T12:48:47Z : No. of bitstreams: 1 000829802.pdf: 1465255 bytes, checksum: 2d7e1dd40db91bb9503377e7965f6c9d (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Fundação do Instituto de Biociências (FUNDIBIO)<br>Inserido na realidade de contaminação dos rios amazônicos pelo mercúrio, este trabalho busca, por meio do estudo metaloproteômico, a identificação e a caracterização de proteínas do tecido muscular de três espécies d

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Moraes, Paula Martin de. "Fracionamento de mercúrio em amostras de tecido muscular de peixes coletados na área de influência do AHE Jirau - Bacia do rio Madeira utilizando estratégias metaloproteômicas /." Botucatu, 2014. http://hdl.handle.net/11449/123974.

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Orientador: Pedro de Magalhães Padilha<br>Banca: Clelia Akiko Hiruma Lima<br>Banca: Marília Afonso Rabelo Buzalaf<br>Banca: Paulo dos Santos Roldan<br>Banca: Lincolin Carlos Silva de Oliveira<br>Resumo: Inserido na realidade de contaminação dos rios amazônicos pelo mercúrio, este trabalho busca, por meio do estudo metaloproteômico, a identificação e a caracterização de proteínas do tecido muscular de três espécies diferentes de peixes do rio Madeira que possam atuar como possíveis biomarcadores da toxicidade deste elemento na região de influência do Aproveitamento Hidrelétrico de Jirau (AHE JI

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25

Martinez, Maria L. 1960. "Organochlorine Pesticides and Heavy Metals in Fish From the Trinity River, Texas." Thesis, University of North Texas, 1990. https://digital.library.unt.edu/ark:/67531/metadc500474/.

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The Trinity River passes through the Dallas-Fort Worth metroplex receiving point and non-point source contaminant loadings. Lepomis spp. were collected at twelve sampling locations in the Trinity River in August 1987 and September 1988 and analyzed for organochlorine pesticides and heavy metals. Results from the study were compared to existing U.S. FDA action and tolerance levels, LC50s, and historical data. Various longitudinal trends and some concentration patterns were observed. Continual study of pesticide and metal body burdens in fish allow testing for trends, and thereby, lead to a bett

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McKillip, Michael Lee. "Coupling the Hydrodynamic and Water Quality Model CE-QUAL-W2 With a Multi-Trophic Fish Bio-Energetics Model for Lake Roosevelt, Washington." PDXScholar, 2008. https://pdxscholar.library.pdx.edu/open_access_etds/3078.

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Grand Coulee Dam created Franklin D. Roosevelt Lake as part of the Columbia Basin Project. Located in northeastern Washington State, the Project provides economically important hydropower (19 billion kilowatt hours per year), irrigation (225,000 ha), flood control, and sport fishing ($5 to 20 million annually). A good system understanding aids in balancing these beneficial uses for the 230 km long reservoir. The reservoir's atypical 45-day mean residence time is much shorter than a typical lake, and much longer than for a riverine dam. The spring freshet requires drawdowns of 15 to 20 m for fl

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27

Mensah, Paul Kojo. "Environmental water quality management of glyphosate-based herbicides in South Africa." Thesis, Rhodes University, 2013. http://hdl.handle.net/10962/d1001987.

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Although the use of pesticides is necessary to meet the socio-economic needs of many developing countries, especially in Africa, side effects of these bio-active chemicals have contributed to contaminating aquatic and terrestrial ecosystems. Environmental water quality degradation by pesticides interferes with ecosystem health and poses numerous risks to aquatic life. In South Africa, glyphosate-based herbicides are frequently used to control weeds and invading alien plants, but ultimately end up in freshwater ecosystems. However, there are no South African-based environmental water quality ma

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28

Hayes, Johan Barnard. "Assessment of fish as bio-indicators of river health in rivers of the southwestern Cape." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/52704.

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Thesis (MSc)--University of Stellenbosch, 2002.<br>ENGLISH ABSTRACT: In this study, the Fish Assemblage Integrity Index (FAll) was applied on three rivers within the southwestern Cape. This index uses fish as indicators of biological aquatic integrity and is based on indigenous species expected to be present in biological fish habitats. Fish integrity classes were calculated for each of the sites in the three rivers studied. Sites 2 and 4 within the Lourens River were rated as Class C, whereas sites 1 and 3 were rated as Class F and Class D respectively. Sites 1, 2 and 4 within the Palmi

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Wunderlich, Alison Carlos [UNESP]. "Parasitos de peixes e biomarcadores como ferramentas para avaliação da poluição em rios e represas na bacia do Rio Tietê, estado de São Paulo." Universidade Estadual Paulista (UNESP), 2015. http://hdl.handle.net/11449/140221.

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Made available in DSpace on 2016-07-01T13:10:22Z (GMT). No. of bitstreams: 0 Previous issue date: 2015-02-27. Added 1 bitstream(s) on 2016-07-01T13:13:47Z : No. of bitstreams: 1 000865809_20170301.pdf: 260503 bytes, checksum: 3e79e7bc77d518ffd72f73f4301727cb (MD5) Bitstreams deleted on 2017-03-03T11:01:33Z: 000865809_20170301.pdf,. Added 1 bitstream(s) on 2017-03-03T11:02:42Z : No. of bitstreams: 1 000865809.pdf: 1846324 bytes, checksum: 3b33f5972e852e7c38fcb0ac2633d033 (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Conselho Nacional de Desenvolvimento Cient

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Wunderlich, Alison Carlos. "Parasitos de peixes e biomarcadores como ferramentas para avaliação da poluição em rios e represas na bacia do Rio Tietê, estado de São Paulo /." Botucatu, 2015. http://hdl.handle.net/11449/140221.

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Orientador: Reinaldo José da Silva<br>Banca: Alessandro Francisco Talamini do Amarante<br>Banca: Lúcia Helena O'Dwer de Oliveira<br>Banca: Luis Eduardo Roland Tavares<br>Banca: Ana Cécília Amado Xavier de Oliveira<br>Resumo: Não disponível<br>Abstract: Not available<br>Doutor

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31

Wise, Patricia D. (Patricia Diane). "An Evaluation of Fish and Macroinvertebrate Response to Effluent Dechlorination in Pecan Creek." Thesis, University of North Texas, 1995. https://digital.library.unt.edu/ark:/67531/metadc278302/.

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This study evaluated the effects of chlorinated effluent discharged from the City of Denton, Texas' wastewater treatment plant on Pecan Creek's fish and macroinvertebrate assemblages, and their recovery upon dechlorination. A baseline of ecological conditions was established while chlorine was present in the effluent (June 1993- October 1993), and was evaluated again after dechlorination with sulfur dioxide (October 1993-August 1994). In situ Asiatic clam and fathead minnow ambient toxicity tests, and fish and macroinvertebrate collections were used to establish this baseline for comparison to

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Mpofu, Christopher. "Assessment of organochlorine pesticide residues in fish samples from the Okavango Delta, Botswana." Thesis, Rhodes University, 2011. http://hdl.handle.net/10962/d1006707.

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This thesis presents an evaluation of the dispersive solid-phase extraction (d-SPE) method referred to as the quick, easy, cheap, effective, rugged and safe (QuEChERS) method for the determination of four organochlorine pesticide residues in fish samples. The pesticides investigated in this study were o, p′-DDT, p, p′-DDE, aldrin and dieldrin. The combined use of Gas Chromatography with an Electron Capture Detector (GC-ECD) and sensitive Time of Flight (TOF) mass detector facilitated the identification of the target analytes. In the absence of certified reference material, the overall analytic

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Maschmann, Gerald F. "Recovery of the Fish Population of a Municipal Wastewater Dominated, North Texas Creek After a Major Chlorine Disturbance." Thesis, University of North Texas, 2002. https://digital.library.unt.edu/ark:/67531/metadc3230/.

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This study evaluated the effects of a major chlorine disturbance on fish communities in Pecan creek by the City of Denton's Pecan Creek Water Reclamation Plant. Fish communities in Pecan Creek were sampled using a depletion methodology during February, April, July, and November, 1999. February and April sampling events showed that the fish communities were severely impacted by the chlorine. Sampling during July and November showed fish communities recovered in Pecan Creek. The first-twenty minutes of shocking and seining data were analyzed to mirror an equal effort methodology. This methodolog

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Joubert, Anel. "Evaluation of biomarkers for pollution in Oreochromis mossambicus: a laboratory and field study." Thesis, 2008. http://hdl.handle.net/10210/1024.

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There are many types of chemicals/contaminants present in the environment, ranging from synthetic chemicals to trace metals that are required for life. When an organism is exposed to a toxicant, adverse effects are generally first at the sub-organismal level. There is thus a need for physiological and biochemical indicators of organismal health and sub-lethal toxicant effects. A bio-indicator, or biomarker, is a response of a living organism to environmental changes or because of exposure to contaminants. The main objectives of this study were to evaluate and investigate the possible use of bi

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"Effects of mining activities on selected aquatic organisms." Thesis, 2012. http://hdl.handle.net/10210/5457.

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Ph.D.<br>Except for agriculture, the mining industry is considered as not only the oldest but also the most important industry. Mining involves the removal of minerals from the earth's crust for usage by mankind. The disturbance during mining activities such as mining effluent has an effect on the natural aquatic environment. In any freshwater environment, the macroinvertebrates form a vital link between the abiotic envinronment and the organisms in higher trophic levels. It is thus true that specific environmental contaminants, such as mining effluent, may directly affect the survival of maco

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Maartens, Annamien. "Metal concentrations in the diet and aquatic environment as mechanisms of metal accumulation in selected freshwater fish species." Thesis, 2015. http://hdl.handle.net/10210/14390.

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M.Sc.<br>The Kruger National Park is internationally one of the best known conservation areas. The perennial rivers draining eastward towards and through the park are of great importance in maintaining a healthy ecosystem. The Olifants River catchment is the largest of all the rivers flowing through the Kruger National Park. Although this river has ceased flow for three days in 1968, problems experienced in the Olifants River are of a qualitative rather than a quantitative nature. Several factors contribute to the deteriorating water quality of the Olifants River. Urbanization, agricultural, i

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Nibamureke, Marie Clémentine Uwineza. "Fish histopathology as a tool to assess the health status of freshwater fish species in the Albasini Dam, Limpopo Province, South Africa." Thesis, 2015. http://hdl.handle.net/10210/13850.

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MSc. (Zoology)<br>The Albasini Dam was used as a reference site outside the DDT (1, 1, 1-trichloro-2, 2-bis (p-chlorophenyl) ethane) - sprayed area in a previous survey conducted from 2006 to 2008. DDT, endocrine disrupting chemicals and inorganic chemicals were detected in the dam. A histological analysis of fish from the dam showed histological alterations in heart, liver, gills, and gonads. Therefore, it was necessary to follow up the health status of the dam by monitoring the levels of organic and inorganic chemicals and their effects on fish. The aim of the present study was to determine

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Sikhakhane, Ngcebo Nkululeko Treasure. "A histology-based fish health assessment to determine the health status of two freshwater fish species from three hypertrophic impoundments in the North-West Province, South Africa." Thesis, 2014. http://hdl.handle.net/10210/9272.

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M.Sc. (Aquatic Health)<br>South Africa’s freshwater ecosystems are under threat due to anthropogenic activities. Recent reports have shown that the Hartbeespoort- (HBPD), Klipvoor- (KD) and Bospoort Dam (BD) impoundments situated in the North-West Province are polluted as a result of mining, industrial and agricultural activities. These impoundments are classified as being in a hypertrophic state. The health status of fish in these impoundments is of concern, and needs to be investigated. For this purpose, Clarias gariepinus and Cyprinus carpio were collected for a histology-based fish health

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Heath, Ralph Gregory Melville. "A catchment-based assessment of the metal and pesticide levels of fish from the Crocodile River, Mpumalanga." Thesis, 2012. http://hdl.handle.net/10210/5747.

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Ph.D.<br>The Crocodile River catchment, in Mpumalanga, is one the most intensively used catchments in South Africa. The large number of intensively cultivated crops grown in the middle and lower subcatchments; industrial discharges; highly intensive irrigation; and extensive areas of exotic afforestation in the upper and middle sub-catchments has dramatically changed land use patterns within the catchment. The Middle Crocodile River sub-catchment is also impacted by intensive urbanisation; around Nelspruit, KaNyamazane and Matsulu. The Kaap River sub-catchment has been intensively mined for mi

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"Determining the role of catchment geochemistry on the chemistry of water, sediment and fish from impoundments within selected large catchments in South Africa." Thesis, 2015. http://hdl.handle.net/10210/13873.

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Ph.D. (Zoology)<br>The study concept was derived following an information requirement related to the need for the development of a scientifically sound technique to minimize illegal entries at major South African freshwater fishing tournaments. The hypothesis was that fish that are in equilibrium with the environment that they live in should reflect the chemistry of that environment. Therefore it would be possible to chemically link the fish to a specific impoundment and identify whether the fish are indeed from that impoundment or whether they were brought there to be illegally entered at a f

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Mahlangu, Sikhumbuzo Emmanuel. "Aquatic health assessment of the Klip River System, Gauteng, South Africa." Thesis, 2014. http://hdl.handle.net/10210/11344.

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M.Sc. Aquatic Health)<br>The Klip River runs past heavy urbanization and industrialization as a consequence it is possibly one of the most abused river systems in Gauteng and perhaps the country as a whole. Eight sites were selected along the course of the Klip River for biomonitoring purposes. The sites were selected to represent the upper, middle and lower reaches of the river, while sites representing point source pollution sources were also included. Various biomonitoring techniques have been included to determine the present ecological state of the Klip River. This includes biotic indices

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Kanga, Jean Serge. "A comparative health assessment of three fish species from a selected site in the Vaal River, South Africa." Thesis, 2013. http://hdl.handle.net/10210/8528.

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M.Sc. (Zoology)<br>The Vaal River system is constantly subjected to pollution from various industrial, mining and agricultural activities. Consequently, pressure is continually exerted on the health of its fish communities and it was suspected that this may be a contributing factor to the repeated fish kills that have occurred in various sections of the river over the past few years. The aim of this study was to assess the health status of three fish species that were affected by the most recent mass fish mortality in the Vaal River. This was done using a combination of techniques including a

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Nussey, Gail. "Metal ecotoxicology of the Upper Olifants River at selected localities and the effect of copper and zinc on fish blood physiology." Thesis, 2012. http://hdl.handle.net/10210/7393.

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D.Phil.<br>The entire Olifants . River Catchment is subjected to increasing afforestation, agricultural, domestic, mining, industrial, irrigation and urbanisation activities. These activities have a profound effect on the water quality of the river and its tributaries. This is cause for concern for the water users in the upper catchment, and because the Kruger National Park, one of its downstream water users, is extremely dependent on water of a satisfactory quality to sustain its various ecosystems. It is therefore vitally important to determine to what extent activities in the Upper Catchmen

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Mokae, Motsidisi Lorraine Lolo. "Histomorphology as a tool to assess the health status of five economically important fish species in the Okavango Delta Panhandle, Botswana." Thesis, 2014. http://hdl.handle.net/10210/8811.

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Ph.D. (Zoology)<br>Histomorphology as a tool to assess the health status of five economically important fish species in the Okavango Delta Panhandle, Botswana the Okavango Delta, and an inland freshwater wetland of national and international importance was designated by the Ramsar Convention in 1996. This site is of global importance because of a wide diversity of fish species found in this freshwater ecosystem. The Okavango Delta is also one of the last 'near pristine' sites on the African continent and therefore serves as an ideal reference site to describe the normal histomorphology of sele

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Barnhoorn, Irene Ellen. "Selected enzymes and heat shock protein 70 as biomarkers of pollution in the reproductive organs of freshwater fish." Thesis, 2008. http://hdl.handle.net/10210/1010.

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The biological integrity of aquatic ecosystems has become threatened by the effects of eutrophication, acidification as well as increased organic and inorganic chemical loads. It is necessary to identify the effects of xenobiotics before the onset of death in an exposed organism or deteriorating changes at population level. Biochemical and physiological indicators such as enzymes and stress proteins could be used as a valuable tool for detecting chemical exposure and evaluating their effects on aquatic organisms. The use of selected enzymes in different organs/tissue was evaluated as possible

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Mooney, Amanda. "An assessment of the health status and edibility of fish from three impoundments in the North West Province, South Africa." Thesis, 2013. http://hdl.handle.net/10210/8336.

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M.Sc. (Aquatic Health)<br>The North West Province is mineral rich and known for its extensive mining and agricultural activities. These activities drain organic and inorganic pollutants in our waterways, possibly resulting in reduced water quality in dams. Organic and inorganic pollutants such as nutrients, organochlorine pesticides and metals may be present in unacceptable levels possibly affecting fish as well as human health. The North West dams are known for their high nutrient loads and are mostly classified as hypertrophic. In order to better understand the possible effects of the combin

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Groenewald, Marinka. "Bioaccumulation of metals and the general health of fish from the Vaal Dam and Vaal River Barrage." Thesis, 2012. http://hdl.handle.net/10210/4320.

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M.Sc.<br>The water quality in the Vaal River system has deteriorated due to increasing industrial, mining and agricultural activities in the Vaal Dam and Vaal River Barrage catchment areas. This study was undertaken to determine the water quality in the Vaal Dam, and three localities within the Vaal River Barrage reservoir (i.e. the Riviera Aquatic Club, Abrahamsrust Pleasure Resort and at the Barrage structure). The objectives of this study, was to determine the fish population species composition, evaluate the general health of the selected fish species and obtain site specific metal bioaccu

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Nel, Pieter Phillip Cornelius. "'n Ekologiese studie van Sarotherodon mossambicus en Tilapia rendalli in verhitte rioolwater." Thesis, 2014. http://hdl.handle.net/10210/11687.

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Smith, Warren Clifford. "A histology-based health assessment of selected fish species from two rivers in the Kruger National Park." Thesis, 2012. http://hdl.handle.net/10210/6153.

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M.Sc.<br>The Olifants- and Luvuvhu rivers both flow through the Kruger National Park (KNP). The Olifants River (OR) is a major tributary of the Limpopo River with water quality being less than desirable due to high concentrations of pollutants as a result of the activities in the upper catchment. The crocodile population of the river declined from 1000 in 2008 to 347 in 2009 due to pansteatitis. Labeobarbus marequensis in the upper catchment also showed symptoms of the disease (Templehoff, 2010). This raised concern about the health of the fish in the OR, particularly in the section flowing th

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Van, Rensburg Engela Larya. "Die biokonsentrering van atrasien, sink en yster in Tilapia sparrmanii (Cichlidae)." Thesis, 2014. http://hdl.handle.net/10210/12712.

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