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Dissertations / Theses on the topic 'African catfish'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Pantazis, Panagiotis Aristeidis. "Nutritional studies in the African catfish Clarias gariepinus (Burchell, 1822)." Thesis, University of Stirling, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341208.

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2

Huchzermeyer, Karl David August. "Pansteatitis in African sharptooth catfish, Clarias gariepinus (Burchell), in the Kruger National Park, South Africa." Thesis, University of Pretoria, 2012. http://hdl.handle.net/2263/24994.

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In the Kruger National Park (KNP), pansteatitis in sharptooth catfish, Clarias gariepinus (Burchell), was shown to be a serious problem in the inlets to large man-made lakes fed by rivers arising in the polluted catchments of the Olifants and Sabie rivers. An increasing prevalence of pansteatitis was recorded in catfish from the Olifants River gorge. A low prevalence was found in catfish upstream of the gorge at two further sites. No pansteatitis was detected in catfish from a rain-filled dam distant from the potential pollution sources affecting the Olifants River and in rivers arising outsid

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3

Ali, Md Zulfikar. "Dietary protein and energy interactions in African catfish Clarias gariepinus (Burchell, 1822)." Thesis, University of Stirling, 2001. http://hdl.handle.net/1893/64.

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In order to investigate the interactions of dietary protein and energy and their utilisation by African catfish, Clarias gariepinus (Burchell, 1822) (12.43 ± 0.05 g), a series of four nutritional experiments (triplicate groups of 20 fish per 30-L tank at 28 ± 1°C, for 8 weeks) were carried out using fish meal based diets. Optimum dietary protein to energy ratio (P/E ratio) and optimum lipid to carbohydrate ratio (L/CHO ratio) were investigated. Based on optimised dietary P/E ratio and L/CHO ratio, optimum feeding regime and compensatory growth were also investigated in this species. In the exp

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4

Kadye, Wilbert Takawira. "Assessing the impacts of invasive non-native African sharptooth catfish Clarias Gariepinus." Thesis, Rhodes University, 2012. http://hdl.handle.net/10962/d1005070.

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Invasive species are of particular concern as they have the potential to alter community structure and food web relationships within their invaded habitats. African sharptooth catfish Clarias gariepinus, a generalist predator, was introduced through an inter-basin water transfer scheme into the Great Fish and Sundays Rivers, Eastern Cape, South Africa, where it threatens the native riverine biota. This thesis assessed its impact from a trophic perspective. Patterns in catfish distribution and abundance revealed an upstream to downstream gradient that was associated with spatial distribution of

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5

Haylor, Graham S. "The culture of African Catfish, Clarias gariepinus (Burchell) in Africa, with particular reference to controlled hatchery production." Thesis, University of Stirling, 1992. http://hdl.handle.net/1893/3267.

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A rationale is presented for a primary nursing strategy and an on-growing strategy for Clarias gariepinus (Burchell) culture in Africa, thus providing a potential model for the development of culture technology for the species. Existing information pertaining to the production strategies identified is reviewed, highlighting the attributes of African catfish for aquaculture. Some of the current deficiencies and inconsistencies in available information pertaining to controlled hatchery production are addressed. The early developmental stages of Clarias gariepinus are defined, in order to promote

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6

Al-Khamees, Sami A. "Photoperiod effects on circadian rhythms and puberty onset in African catfish Clarias gariepinus." Thesis, University of Stirling, 2009. http://hdl.handle.net/1893/1819.

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Photoperiod manipulation is routinely used in the aquaculture industry with the aim to enhance growth by manipulating the timing of reproduction in several commercially important temperate fish species. However, there are clear gaps in our understanding of how photoperiod is perceived by the circadian axis and transmitted to the brain to alter reproduction. Furthermore, due to the wide range of environments inhabited by fish, it is unlikely that one single organization exists. It is therefore believed that comparative studies of temperate species “models” with tropical species such as the Afri

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7

Osman, Alaa Gad el-Karim Mahmoud. "Embryo-toxic effects of lead nitrate of the African catfish Clarias gariepinus (Burchell, 1822)." [S.l.] : [s.n.], 2007. http://deposit.ddb.de/cgi-bin/dokserv?idn=984360840.

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8

Lückhoff, Paul Daniël. "Application of the condition factor in the production of African sharptooth catfish Clarias gariepinus /." Link to the online version, 2005. http://hdl.handle.net/10019/1098.

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9

Hossain, Mostafa A. "Optimization of feeding and growth performance of African catfish (Clarias gariepinus Burchell, 1822) fingerlings." Thesis, University of Stirling, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298562.

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10

Luckhoff, Paul Daniel. "Application of the condition factor in the production of African sharptooth catfish Clarias gariepinus." Thesis, Stellenbosch : University of Stellenbosch, 2005. http://hdl.handle.net/10019.1/3421.

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Thesis (MPhil (Animal Sciences. Aquaculture))--University of Stellenbosch, 2005.<br>In recent years there has been a renewed interest in the commercial culture of African Sharptooth Catfish. Its robust characteristics and its air breathing capabilities makes the African catfish a good candidate for culture in intensive recirculating systems. In light of the size variation in offspring spawned from undomesticated fish, that may eventually increase cannibalism, suitable methods for the quantification of some production performance parameters such as growth and health measurements need to be

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11

Osman, Alaa Gad El-Karim Mahmoud. "Embryo-toxic effects of lead nitrate of the African catfish Clarias gariepinus (Burchell, 1822)." Doctoral thesis, Humboldt-Universität zu Berlin, Landwirtschaftlich-Gärtnerische Fakultät, 2007. http://dx.doi.org/10.18452/15612.

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Im Rahmen der Studien zur Wirkung von Bleinitrat auf die Embryonalstadien des afrikanischen Welses Clarias gariepinus wurde zunächst der Einfluß der Besamung auf den Härtungsprozess des Chorions untersucht, um die Bedeutung des gehärteten Chorions als Schutzfunktion im Hinblick auf Schadstoffeinwirkung zu klären. Das Studium der Embryonalentwicklung war erforderlich, um das Ausmaß der Änderung der Normalentwicklung unter dem Einfluß von Bleinitrat bewerten zu können. Im Rahmen der toxikologischen Untersuchungen der Wirkung des Bleinitrats auf die Embryonalstadien wurden folgende biologische Ma

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12

Britz, P. J. (Peter Jacobus) 1959. "Environmental requirements for the hatchery rearing of African catfish Clarias Gariepinus (Pisces: Clariidae) larvae and juveniles." Thesis, Rhodes University, 1988. http://hdl.handle.net/10962/d1001964.

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Inadequate seed production has historically been a factor limiting the commercial culture of Clarias gariepinus. The need to determine the environmental requirements of larvae was identified, in order to facilitate their successful mass rearing in hatcheries. The effects of key environmental factors on the growth, survival and aspects of the behaviour of C. gariepinus larvae and juveniles were investigated under controlled conditions. A strong emphasis was placed on the interpretation of the observed responses in terms of the natural history of the animal. Larvae were obtained by artificially

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13

Baker, Remi Thomas Merrett. "The antioxidant role of α-tocopherol in the nutrition of the African catfish Clarias gariepinus Burchell". Thesis, University of Plymouth, 1996. http://hdl.handle.net/10026.1/2669.

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The role of the lipid-soluble antioxidant α-tocopherol (vitamin E) in the nutrition of African catfish (Clarias gariepinus Burchell) has been investigated with respect to effects on growth, certain indices of health and prevention of tissue lipid peroxidation. Although juvenile C. gariepinus were not found to show an immediate dependency on vitamin E for growth, even during rapid growth stages, a minimum requirement of α-tocopherol based on the prevention of hepatic lipid peroxidation was established at 30-40 mg α-tocopherol per kg dry diet. This is in line with published values for numerous c

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14

Oboh, Angela. "Investigating the long-chain polyunsaturated fatty acid biosynthesis of the African catfish Clarias gariepinus (Burchell, 1822)." Thesis, University of Stirling, 2018. http://hdl.handle.net/1893/27282.

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Investigating the biosynthesis of long-chain (C20–24) polyunsaturated fatty acids (LC-PUFA), physiologically important compounds including arachidonic acid (ARA), eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), in fish is crucial to identify dietary requirements for essential fatty acids (EFA). Moreover, knowledge of the C20–24 LC-PUFA biosynthetic capability of farmed fish species enables us to understand their ability to utilise commonly used raw materials such as vegetable oils, which naturally lack LC-PUFA but include C18 PUFA that are metabolic precursors of LC-PUFA. Studies h

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15

Rouhani, Q. A. "Digestible energy as a criterion for the development of diets for the African sharptooth catfish, Clarias gariepinus (Pisces: Clariidae)." Thesis, Rhodes University, 1993. http://hdl.handle.net/10962/d1005103.

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Based on a number of attributes, the African sharptooth catfish, Clarias gariepinus is an ideal aquaculture species. Much work has been undertaken on developing the technology for the commercial culture of the species inclusive of determining the nutritional requirements for cost effective feed formulation. However, digestible energy (DE) values for specific feed ingredients were unknown. As DE values are not interchangeable between species, this study set out to determine the DE values for conventional and unconventional feed-ingredients for the formulation of an optimal feed. The ultimate go

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16

Palhares, Gerson Lopes. "Sistema porta hepático do bagre africano Clarias gariepinus Burchell, 1822 (Clariidae, Siluriformes, Ostariophysii)." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/10/10132/tde-17102006-112001/.

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Estudou-se o sistema porta hepático do bagre africano Clarias gariepinus Burchell, 1822, sob o ponto de vista da anatomia macroscópica e microscópica, utilizando-se várias técnicas anatômicas, que envolveram anestesia, injeção de substâncias recomendadas ao estudo do sistema vascular (látex, nanquim, cloreto de polivinil e substância radiopaca), dissecação, corrosão ou radiografia, conforme a exigência de cada técnica, como meio de compreensão da anatomia vascular do fígado deste peixe. Foram utilizados 16 exemplares do sexo feminino, com comprimento total entre 45 e 53,5 centímetros e massa c

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17

Abdel-Warith, Abdel-Wahab A. "Suitability of selected raw materials and by-products in formulated feeds for Nile tilapia Oreochromis niloticus and African catfish Clarias gariepinus." Thesis, University of Plymouth, 2002. http://hdl.handle.net/10026.1/633.

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The current status of global aquaculture production was reviewed with a special emphasis on Africa and in particular Egypt. The main species of interest in this study were tilapia Oreochromis niloticus and African catfish Clarias gariepinus which are gaining popularity and are of considerable importance in the market of farmed fish in this continent and of economic relevance to Egypt and other Middle Eastern countries. Research was principally directed to establishing the suitability of specific feed ingredients and materials that could be included in balanced diets for both species. Various a

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18

De, Villiers Pierre. "The ecology and culture of the rock catlet Chiloglanis pretoriae (Pisces : mochokidae)." Thesis, Rhodes University, 1991. http://hdl.handle.net/10962/d1005111.

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Chiloglanis pretoriae is a rock catlet, indigenous to southern Africa. The aim of the study was to develop a technique to culture C. pretoriae as an alternative to harvesting and selling wild caught fish on the international aquarium trade. As nothing was known about the culture of African rock catlets an investigation into the biology and ecology of the species was necessary to develop the culture protocol. Chiloglanis pretoriae inhabits fast flowing rapids (current speeds over 0.6 metres per second). It is a serial interstitial gravel spawner, that spawns during the summer months. Chiloglani

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19

Gaede, Anna Luise. "Untersuchungen zur Erprobung von geeigneten Betäubungsverfahren für die Schlachtung Afrikanischer Welse (Clarias gariepinus)." Doctoral thesis, Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-203224.

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Einleitung Entsprechend der Tierschutz-Schlachtverordnung sind Wirbeltiere vor der Tötung grundsätzlich zu betäuben. Die für Fische zulässigen Betäubungsmethoden haben sich jedoch für die Betäubung Afrikanischer Welse (Clarias gariepinus) in der Praxis als problematisch erwiesen. Ziel der Untersuchungen Das Untersuchungsziel bestand in der Erprobung und Optimierung von Betäubungsverfahren für die Schlachtung Afrikanischer Welse. Verschiedene Varianten der Vorkühlung, Eiswasserbehandlung und Elektrobetäubung wurden einzeln oder in Kombination vergleichend geprüft. Materialien und Methoden Zur

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20

Tilney, Robin Lewis. "Aspects of the biology, ecology and population dynamics of Galeichthys feliceps (Valenciennes) and G. ater (Castelnau) (Pisces: Ariidae) off the south-east coast of South Africa." Thesis, Rhodes University, 1991. http://hdl.handle.net/10962/d1005064.

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This thesis represents a detailed investigation into aspects of the biology, ecology and population dynamics of two endemic ariid species, Galeichthys feliceps and G. ater, off the southeast coast of South Africa. The two species are exploited as a by-catch in the commercial ski-boat fishery off Port Alfred, a fishery dominated by highly fecund sparid and sciaenid species. They collectively constitute approximately 10% of the total annual catch in terms of landed mass G. feliceps outnumber G. ater in the catches by a ratio of 3:1. The investigation was designed to provide the biological data r

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21

Oellermann, Lawrence Keith. "A comparison of the aquaculture potential of Clarias gariepinus (Burchell, 1822) and its hybrid with Heterobranchus longifilis valenciennes, 1840 in Southern Africa." Thesis, Rhodes University, 1996. http://hdl.handle.net/10962/d1005089.

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The aim of this study was to evaluate the aquaculture potential of a hybrid between the two largest African silurid catfish, Heterobranchus longifilis (HL) and Clarias gariepinus (CG) . A morphometric, meristic and karyological study showed that the hybrid shared some of the physical characteristics of both C. gariepinus and H. longifilis, while its chromosome complement and fundamental number (2N = 54, FN = 95), was intermediate between that of H. longifilis (2N = 52, FN = 92) and C. gariepinus (2N = 56, FN = 97). The HLxCG cross could therefore be regarded as a true hybrid. For the character

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22

Mthombeni, Vusi Gedla. "The biology of austroglanis gilli and austroglanis barnardi (siluriformes : austroglanididae) in the Olifants River system, South Africa." Thesis, Rhodes University, 2010. http://hdl.handle.net/10962/d1015222.

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Austroglanis gilli and A. barnardi are endemic to the Clanwilliam-Olifants System in the Western Cape, South Africa. The populations of each of these species are considered to be threatened by various anthropogenic activities, which include inappropriate agricultural practice and impacts of alien invasive fish species. The purpose of this thesis was to assess the life-history of these two endangered species in order to contribute to understanding their biology. Such information is vital for the development of strategies for their conservation. Marginal zone and marginal increment analyses from

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23

Bruwer, Erna Elfriede. "Biochemical and molecular genetic studies of the Southern African catfish genus Synodontis Cuvier, 1816 (Teleostei, Mochokidae)." Thesis, 2008. http://hdl.handle.net/10210/1014.

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Synodontis Cuvier, 1816 (Teleostei, Mochokidae) species are often extremely abundant in local fisheries catches over their entire distribution range. They are appreciated as food as well as popular aquarium fishes. However, some species are extremely difficult to identify due to the taxonomically unreliable nature of prominent morphological features. Establishing the correct identification is important and can have far-reaching consequences (e.g. in fisheries, conservation, stock assessment, and angling records may be compromised by misidentifying species due to the complicated nature of prese

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24

Hengsawat, Khwuanjai. "The effect of stocking density on production, growth and mortality of African catfish (Clarias gariepinus Burchell 1822) cultured in cages." 1993. http://hdl.handle.net/1993/29381.

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25

Osman, Alaa Gad el-Karim Mahmoud [Verfasser]. "Embryo-toxic effects of lead nitrate of the African catfish Clarias gariepinus (Burchell, 1822) / von Alaa Gad El-Karim Mahmoud Osman." 2007. http://d-nb.info/984360840/34.

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26

BORŮVKA, Vít. "Vliv teploty na udržení schopnosti oplození a líhnivosti při přechovávání neoplozených jiker u keříčkovce červenolemého." Master's thesis, 2017. http://www.nusl.cz/ntk/nusl-317971.

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When hormonally induced artificial spawning of african catfish (Clarias gariepinus), was several female injected intraperitoneally in one dose preparation Ovopel at doses of 1.5 pellet × kg-1. Females were kept separately in the tanks at a temperature of 21.5 °C. All females were spawned at the same time latency 19.2 hours. Eggs from three spawned females were mixed and divided into 6 doses. Each batch was placed into thermoboxes at temperature 5 °C, 10 °C, 15 °C, 20 °C, 25 °C and 30 °C. These eggs were stored in thermoboxes and after times of storage 0.5 h, 1 h, 1.5 h, 2 h, 3 h, 4 h, 6 h, 8 h

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27

PETR, Miloš. "Testování produkční účinnosti vybraných komerčních krmiv pro tržního keříčkovce červenolemého (Clarias gariepinus)." Master's thesis, 2012. http://www.nusl.cz/ntk/nusl-137512.

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In my diploma thesis I was tested six types of feed. I tested in 3 repetitions in the recirculating system with biological treatment of water. Tested fishes african catfish (Clarias gariepinus) weighted between 200 ? 800 g per piece, were deployed into 18 aquariums with volume of 190 litres per aquarium. The whole experiment took place in five partial 3-week periods in the intensive breeding of the laboratory - controlled reproduction of fishes FROV JCU. The average water temperature during the experiment was 27 °C. The main objective of the thesis was to observe production efficiency of teste

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BLAŽKOVÁ, Jaroslava. "Demembranace spermií ryb: navržení a ověření postupů u různých druhů sladkovodních ryb a demonstrace využití této techniky na příkladu studia vlivu těžkých kovů přímo na axonemu spermie." Master's thesis, 2014. http://www.nusl.cz/ntk/nusl-252414.

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The object of this study is to design demembranation method on four freshwater species and its application on study of the influence of HgCl2 on the axoneme and motity sperm motility parameters. Demembranation was designed and examined for all investigated species common carp (Cyprinus carpio), sterlet (Acipenser ruthenus), perch (Perca fluviatilis) and african catfish (Clarias gariepinus). One-step and two-step method was designed and tested for common carp. One-step method was designed for sterlet and perch. Two-step method of demembranation was designed for african catfish. Demembranation w

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ČTRNÁCT, Petr. "Testování produkční účinnosti speciálních krmiv pro sumce u tržního keříčkovce červenolemého (Clarias gariepinus) v recirkulačním systému." Master's thesis, 2012. http://www.nusl.cz/ntk/nusl-137511.

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The main objective of this diploma thesis is compare the production efficiency of special types of feed for African catfish in experimental conditions in a recirculating system with biological treatment of water. It was tested four different types of floating feed, differing in the proportion of main components, the chemical composition and determining - for catfish (CatCo GROWER - 12 EF, CatCo SELECT - 13 EF and CatCo GROWER - 13 EF), respectively salmonid fish species (Dibaq Trout Evolution). The primary outcome indicators was the growth rate, individual weight (and it's variability), feed c

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30

Barson, Maxwell. "Endoparasites of the sharptooth catfish, Clarias gariepinus (Burchell), from the Rietvlei Dam, Sesmyl Spruit system, South Africa." Thesis, 2008. http://hdl.handle.net/10210/1011.

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The Rietvlei Dam near Pretoria, South Africa, provides drinking water for the city and for the wild life in the Rietvlei Nature Reserve, and is also used for recreational fishing. The dam is part of the Sesmyl Spruit system, which has a history of pollution, the major sources of which are industrial, agricultural and sewage from informal human settlements upstream of the reserve. With a large wetland separating the upstream Marais Dam and the Rietvlei Dam, the system has a high conservation priority status because of the high number of bird species that breed and roost in the various habitats.

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Muteveri, Tinashe. "Genetic and biomolecular responses of the sharptooth catfish (Clarias gariepinus) in the contaminated Rietvlei wetland system, South Africa." Thesis, 2008. http://hdl.handle.net/10210/1202.

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M.Sc.<br>A lot of research in ecotoxicology is currently focused on identifying and developing suitable biomarkers for use in assessing the health of aquatic systems. Thus this study was done as part of a major project aimed at identifying and selecting suitable biomarkers to use in the Rietvlei System, South Africa. This study focused on the response of Clarias gariepinus (Burchell, 1822) to contaminants using three biomarkers: population genetic structure, DNA damage and metallothioneins (MT¡¦s). The main objectives of the study were to assess the potential of these biomarkers in C. gariepin

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32

Kruger, Taneshka. "Effects of endocrine disrupting chemicals on selected reproductive features of the male Sharptooth catfish (Clarias gariepinus)." Thesis, 2012. http://hdl.handle.net/10210/6227.

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D.Phil.<br>The endocrine system regulates important physiological processes in an organism. Numerous natural and synthetic chemicals are released into the environment and can disrupt the normal functioning of the endocrine system, influencing physiological processes even at relatively low concentrations. These chemicals are known as endocrine disrupting chemicals (EDCs). These compounds are highly persistent in nature due to a resistance to biodegradation, and because of their hydrophobicity. EDCs bio-accumulate especially in the fatty tissue of aquatic and terrestrial organisms. Developmental

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McHugh, Kyle Joseph. "Sustainable utilisation of angling resources in the Pongolapoort Dam with specific reference to the health of tigerfish and sharptooth catfish populations." Thesis, 2012. http://hdl.handle.net/10210/4715.

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M.Sc.<br>The tigerfish, Hydrocynus vittatus member of the Alestidae, are ferocious and fierce predators capable of consuming prey up to 40% of their size. In South Africa H. vittatus can be found in the major east-flowing rivers from the Limpopo River to the Phongolo River flowing into the Pongolapoort Dam making up the southernmost population. The Pongolapoort Dam also known as Lake Jozini is located in the high-rainfall subtropical region of northern KwaZulu-Natal. The Pongolapoort Dam wall was completed in 1973 to make it the fifth largest dam in South Africa with a total surface area of 2

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34

Crafford, Dionne. "Application of a fish health assessment index and associated parasite index on Clarias gariepinus (sharptooth catfish) in the Vaal River system, with reference to heavy metals." Thesis, 2012. http://hdl.handle.net/10210/6667.

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M.Sc.<br>The Vaal Dam subcatchment is located in the upper reaches of the Vaal River. As a result the water quality is reasonably good. In contrast the Vaal River Barrage catchment includes the PWV area, resulting in poorer water quality. During this study, a fish Health Assessment Index (HAI) successfully tested in previous studies on the Olifants River System was applied to the Vaal River System. The aim was to determine if the HAI could distinguish between the Vaal Dam and Vaal River Barrage with regards to water quality. Surveys were conducted bimonthly from November 1998 to February 2000.

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35

Botha, Tarryn Lee. "A histology-based fish health assessment to determine the health and reproductive status of Clarias gariepinus in the Hartbeespoort Dam, South Africa." Thesis, 2014. http://hdl.handle.net/10210/9183.

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M.Sc. (Zoology)<br>The freshwater indicator fish species, Clarias gariepinus, was used to assess and compare the health status of fish from the Hartbeespoort Dam (HBPD) and the Groot Marico Bosveld Dam (GM) which was used as a reference site. HBPD is known to be polluted and renowned for its extreme eutrophic state. GM receives water from the Marico River and is said to be in an unmodified natural ecological state. Adult Clarias gariepinus were sampled using gill nets; during low-flow (n=17) and high-flow (n=20) seasons from the HBPD, and once from the GM (n = 20). A histology-based fish healt

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Van, der Merwe Marinda. "Aspects of heavy metal concentration in the Olifants River, Kruger National Park and the effect of copper on the haematology of Clarias gariepinus (Clariidae)." Thesis, 2014. http://hdl.handle.net/10210/9327.

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M.Sc. (Zoology)<br>The necessity to maintain high water quality standards has become essential not only to man, but also to conserve aquatic life forms. The Olifants, Selati and Letaba Rivers were monitored for water quality variables and metal concentration in water, sediments and muscle, gill, fat, gonads, liver, bile, blood and kidney of the sharp tooth catfish, C. qariepinus. Some of the water quality variables measured were not within the limits of those standards set for the protection of fish and other aquatic life forms. Turbidity seems to be the biggest problem, due to the Phalaborwa

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