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Dissertations / Theses on the topic 'Midye'

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Published: 2 June 2025
Last updated: 31 July 2025

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1

White, Hermien Ilse. "Anaesthesia in abalone, Haliotis midae." Thesis, Rhodes University, 1996. http://hdl.handle.net/10962/d1005059.

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The principle aim of this study was to isolate a chemical for the "safe anaesthesia" of abalone under commercial farming conditions. "Safe anaesthesia" implied that the anaesthetic had no immediate detrimental or long term sublethal effect on the abalone, that it was safe for the farmer, the consumer and the environment. Four chemicals, magnesium sulphate (MgS0₄), ethylenediamine tetra-acetic acid (EDTA), 2-phenoxyethanol and procaine hydrochloride were shown to effectively inhibit the in vitro contraction of isolated tarsal muscle of Haliotis midae. This identified them as potential anaesthet
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2

Wu, Yu. "The effects of dietary soya and crystalline phytoestrogens on the growth, gonad development and histology of farmed abalone, Haliotis midae." Thesis, Rhodes University, 2015. http://hdl.handle.net/10962/d1017225.

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The inclusion of soya as a dietary protein source in the formulated feed, Abfeed® S34 (Marifeed Pty (Ltd), Hermanus) for farmed abalone, Haliotis midae has resulted in larger gonads during reproductive seasons compared to the gonads of abalone fed kelp or diets that included fishmeal as the only main protein source. The aim of this study was to determine if the isoflavones present in the soya were responsible for this increase in gonad size and the subsequent effects on farmed abalone growth. Animals weighing between 40-50 g were fed one of seven isonitrogenous and isoenergetic diets containin
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3

Maliza, Siyabonga. "The use of probiotics in the diet of farmed South African abalone Haliotis midae L." Thesis, Rhodes University, 2015. http://hdl.handle.net/10962/d1018178.

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Physiological stress in farmed abalone can lead to immunosuppression and increase the susceptibility to bacterial, viral and parasitic disease, often followed by mortality. Thus, handling and poor water quality can reduce farm production efficiency. Probiotics in aquaculture have been effective in a wide range of species in enhancing immunity, survival, improving feed utilisation and growth. Three putative probionts identified as a result of in vitro screening had been beneficial to laboratory-reared abalone in a previous study. The aim of this study was to produce an abalone feed that contain
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4

Amarawardana, Lakmali. "The chemical diversity of midge pheromones." Thesis, University of Greenwich, 2009. http://gala.gre.ac.uk/5656/.

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The hypothesis that midge sex pheromones could be chemically more diverse in structure than previously thought was tested in the context of four midge species of importance to UK horticulture: pear leaf midge, Dasineura pyri; pear midge, Contarinia pyrivora; blackcurrant midge, D. tetensi; and blackberry midge, D. plicatrix. The major component of the pheromone of D. pyri was identified as (2R, 13R, 8Z)-2, 13-diacetoxy-8-heptadecene. Four isomers were separated by HPLC and in field tests the first eluting isomer only was attractive to male midges. Analysis of volatile collections from female C
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Mutaliano, Joaquim Americo. "Evaluation of the value of sorghum midge resistant hybrids in the USA." Texas A&M University, 2005. http://hdl.handle.net/1969.1/3149.

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Sorghum (Sorghum bicolor [L.] Moench) production in many areas of the world is reduced due to damage caused by sorghum midge (Stenodiplosis sorghicola). There are several methods of control to reduce losses due to sorghum midge, which include cultural practices, biological control, chemical control and resistant cultivars. The best long-term solution for sorghum midge control is the use of genetic resistance in cultivars and hybrids. Recently, sorghum midge resistant hybrids have been developed by several sorghum breeding programs, but there is limited information about agronomic performance r
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6

Moonsamy, Karusha. "Visualisation of bioluminescent Vibrio midae SY9 K811 in juvenile Haliotis midae abalone using non-invasive bioluminescence imagining." Master's thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/9110.

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Includes bibliographical references.<br>Bioluminescence imaging (BLI) is a powerful technique that enables real time monitoring of various processes such as gene regulation, host-pathogen interaction and distribution of bacterial cells in vivo. Most of these processes however have only been monitored in murine models or mammalian tissue culture systems. In order to determine whether BLI could be used to monitor bacterial-host interactions in an invertebrate system, the probiotic bacterium Vibrio midae SY9 was genetically labelled with a bioluminescent plasmid (pKluxCat) containing the lux oper
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7

Dale, Kuys Ruth. "Linkage disequilibrium in the South African abalone, Haliotis midae." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/97991.

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Thesis (MSc)--Stellenbosch University, 2015.<br>ENGLISH ABSTRACT: Linkage disequilibrium (LD) is defined as the non-random association of alleles at two or more loci within a population. It is sensitive to a variety of locus-specific- and demographic factors, and can thus provide much insight into the micro-evolutionary factors that have shaped species of interest. It can also be exploited to identify the genomic regions determining complex traits of interest, which can then be applied as performance evaluation markers in marker-assisted selection (MAS). The South African abalone, Haliotis mid
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8

Hardy, Adam. "New midge resistance for Australian grain sorghum." University of Southern Queensland, Faculty of Sciences, 2007. http://eprints.usq.edu.au/archive/00003566/.

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[Abstract]: The development and commercial release of midge resistant grain sorghum hybrids in Australia has been one of the real success stories of the sorghum industry. Almost all the current commercial sorghum hybrids grown contain a significant baseline of midge resistance that has greatly reduced that pest status of this insect. However while breeding efforts have been successful, it seems only one mechanism of resistance remains present in commercial hybrids. This mechanism of resistance known as ‘ovipositional-antixenosis’ is polygenic in nature and has contributed to the gradual reduct
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9

Van, der Merwe Mathilde. "Growth-related gene expression in haliotis midae." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/5414.

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Thesis (PhD (Genetics))--University of Stellenbosch, 2010.<br>Includes bibliography.<br>ENGLISH ABSTRACT: The slow growth rate of Haliotis midae impedes the optimal commercial production of this most profitable South African aquaculture species. To date, no comprehensive effort has been made to identify genes associated with growth variation in farmed H. midae. The aim of this study was therefore to investigate growth variation in H. midae and to identify and quantify the expression of selected growth-related genes. Towards this aim, molecular methodologies and cell cultures were combined
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10

Blaauw, Sonja. "SNP screening and validation in Haliotis midae." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/19976.

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Thesis (MSc)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: Haliotis midae (commonly referred to as perlemoen) is the only one of five endemic species in South Africa that is commercially valued both locally and internationally. Unfortunately, natural perlemoen populations have become a dwindling resource due to commercial exploitation, poaching and the influx of natural threats, such as the West Coast rock lobster, Jasus lalandii. To preserve the natural diversity and sustainability of natural populations as well as commercial stocks, genetic management and improvement of perlemoe
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11

Visser-Roux, Adelle. "Reproduction of the South African abalone, Haliotis midae." Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/18111.

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Thesis (PhD (Genetics))--Stellenbosch University, 2011.<br>ENGLISH ABSTRACT: Currently, South African aquaculture is dominated by the cultivation of Haliotis midae, which is estimated as the most lucrative sector of the industry, with 934 t being export in 2008, totalling an income of ZAR 268 million (40 million USD) in 2008. This represents 81% of the total rand value of the aquaculture sector. Abalone was the highest aquaculture commodity exported during the last two years from South Africa, representing 24% of the total tonnage exported. Employment in the aquaculture sector increased by app
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12

Hepple, Juli-ann. "An integrated linkage map of perlemoen (haliotis midae)." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/5458.

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Thesis (MSc (Genetics))--University of Stellenbosch, 2010.<br>Includes bibliography.<br>Title page: Dept. of Genetics, Faculty of Science.<br>ENGLISH ABSTRACT: Haliotis midae, or Perlemoen, is the only cultured species of abalone in South Africa and is under great international demand. This species is considered endangered, making sustainable farming practises and law enforcement against poaching essential for maintaining wild stocks. A limited amount of broodstock animals are provided to each farm from which thousands of offspring are grown and exported. The prevention of inbreeding and
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13

Cross, Bronwen. "Cloning and molecular characterisation of four alginate lyase genes from Vibrio midae SY9 : an enteric bacterium from the abalone Haliotis midae." Doctoral thesis, University of Cape Town, 2010. http://hdl.handle.net/11427/4253.

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Includes abstract.<br>Includes bibliographical references (leaves 241-268).<br>Alginate is a linear, un-branched polysaccharide of (1-4)-linked -D-mannuronate (M) and its C-5 epimer, -L-guluronate acid (G). These uronic acids are arranged in three different block types in the alginate polymer; poly-M, poly-G or poly-MG. Alginate lyases are enzymes that utilize a -elimination reaction to depolymerise the alginate polymer resulting in cleavage of the (1-4)-O-glycosidic linkage between monomers and the formation of an unsaturated uronic acid at the new non-reducing terminus. Alginate lyases hav
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14

Zaratiegui, Labiano Jesús María. "¿Cómo se mide el progreso en economía?" Pontificia Universidad Católica del Perú, 2012. http://repositorio.pucp.edu.pe/index/handle/123456789/114829.

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How do we measure progress in economics? Can theory change be interpreted as progress, and how? There are various possible answers that are not necessarily mutually exclusive; the question might be seeking the answer to several puzzles, each one of which needs to be answered differently. Perhaps the starting point should be to think about in parallel how the same task has been carried on in natural sciences, the model that inspired the birth and further development of economics all along. How it has been analyzed, understood and explained.<br>La crisis económica mundial ha puesto, de nuevo, so
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15

Vorster, Gysbert. "A quantitative genetic analysis of the effect of crossbreeding on the growth rate of the South African abalone, Haliotis midae." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/20900.

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Thesis (MSc)--University of Stellenbosch, 2003.<br>ENGLISH ABSTRACT: The genetic status of H. midae broodstock in the South African aquaculture industry reflects that of random samples originating from undomesticated wild populations. The nature of growth in abalone is very slow, taking between three and four years to reach a marketable size of between 60 to 100 grams. It is therefore of paramount importance to improve this trait in order to ensure global competitiveness and economic viability within the industry. Improving this negative characteristic through conventional selection metho
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16

Jansen, Suzaan. "Linkage mapping in Haliotis midae using gene-lnked markers." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/20347.

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Thesis (MSc)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: Haliotis midae, or more commonly known as Perlemoen, is an abalone species found along the coast of South Africa. It is the only cultured abalone species in South Africa and has a high demand abroad. Due to its popularity as a seafood delicacy, illegal harvesting has taken its toll on Perlemoen numbers. This increases the need for sustainable farming efforts and efficient implementation of law enforcement practices against poachers. Abalone farms make use of a limited number of broodstock for breeding, so it is necessary to ens
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17

Van, den Berg Nicol-Candice. "Microsatellite marker development and parentage assignment in Haliotis midae." Thesis, Stellenbosch : Stellenbosch University, 2008. http://hdl.handle.net/10019.1/21911.

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Thesis (MSc)--University of Stellenbosch, 2008.<br>ENGLISH ABSTRACT: The five leading abalone producers in South Africa have initiated a genetic enhancement program for Haliotis midae in a collaborative effort to improve economically valuable traits. Several independent objective-specific studies were initiated, including the establishment of a Performance Recording Scheme (PRS), utilised in this study, and necessary to monitor the ongoing performance of individuals as the move from mass-selection to marker assisted selection (MAS) is implemented. The primary objective of this study was parent
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18

Stepto, Nigel Keith. "Triploid induction in the South African abalone, Haliotis midae." Master's thesis, University of Cape Town, 1997. http://hdl.handle.net/11427/9669.

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Bibliography: leaves 72-80.<br>An investigation was undertaken to determine whether triploidy could be induced and improve the growth rate of the South African abalone, Haliotis midae. From the polar body counts at 17 °C the release times of polar body 1 and 2 were found to be at 12 - 15 min. post insemination (pi.) and 33-36 min. pi. respectively. Cytochalasin B (CB) (0.5mg. 1-¹ seawater) and elevated temperature (30 °C) were used as stresses to induce triploidy. CB induced 48.4% polar body 1 and 70.9 % polar body 2 triploid larvae at 20 hrs pi. At 120 hrs pi. induction rates were 55.5% and 6
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19

Sales, James. "Nutrient digestibility in South African abalone (Haliotis Midae L.)." Thesis, Rhodes University, 2002. http://hdl.handle.net/10962/d1005150.

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The evaluation of potential alternative protein sources for the formulation of least-cost optimal diets to satisfy the nutrient requirements of South African abalone (Haliotis midae) has been hampered by the absence of a suitable, practical, replicable and reliable digestibility technique. A suitable lowcost faeces collection technique was developed in this study to obtain suitable quantities of excreta for analysis from this species. Acid-insoluble ash was identified as a reliable, replicable and safe internal marker in comparison to chromic oxide and crude fibre for use in nutrient digestibi
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20

Macey, Brett M. "Probiotic effect of Vibrio midae SY9, Cryptococcus sp. SS1 and Debaryomyces hansenii AY1 on the growth and disease resistance of farmed Haliotis midae." Master's thesis, University of Cape Town, 2005. http://hdl.handle.net/11427/13954.

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Includes bibliographical references.<br>Although the South African abalone, Haliotis midae, has been commercially harvested since 1949, successful cultivation of this species only began in the 1980s. Since then, the abalone mariculture industry has expanded dramatically and currently produces between 500 and 800 tons of abalone per year with a net farm gate value of approximately R125 million. However, disease has had a severe impact on the international aquaculture industry and is anticipated to become an increasingly important factor, together with the slow growth rate of H. midae, that will
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21

Crompton, Francis Benedict. "Aerobatics and body size in the midge Chironomus plumosus L." Thesis, University of Newcastle Upon Tyne, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289177.

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22

Rippin, David Manish. "The hydrology and dynamics of polythermal glaciers : Midre Lovénbreen, Svalbard." Thesis, University of Cambridge, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.620382.

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23

Badenhorst, Daleen. "Development of AFLP markers for Haliotis midae for linkage mapping." Thesis, Stellenbosch : Stellenbosch University, 2008. http://hdl.handle.net/10019.1/21525.

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Thesis (MSc)--Stellenbosch University, 2008.<br>ENGLISH ABSTRACT: Haliotis midae, is the only commercially important species of the six abalone species found in South African coastal waters and has become a lucrative commercial commodity. Wild stocks of H. midae are, however, no longer commercially sustainable due to a combination of environmental factors and poaching. The solution to the crisis is artificial production systems in the form of abalone farms. An abalone enhancement programme was initiated in South Africa in 2006, funded by industry and government. This programme focuses on
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24

Du, Plessis Jana. "Medium-throughput SNP genotyping and linkage mapping in Haliotis midae." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71701.

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Thesis (MSc)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: Haliotis midae (locally also known as perlemoen) is the largest of five endemic species found along the coast of South Africa. It is the only species with commercial value contributing to the exploitation of these animals. Due to declines of natural stocks, farming practices were established during the early 1990s in order to supply the international demand. To facilitate efficient breeding methods and ensure the sustainability of these commercial populations, genetic management, which can be accomplished with the use of molecul
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Adair, Susan Elizabeth. "Proglacial fluvial sediment transfer dynamics at Midre Lovénbreen, Svalbard." Thesis, Royal Holloway, University of London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.404957.

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26

Zeeman, Susanna Catharina Franzina. "Influences of the abalone Haliotis midae on subtidal benthic communities." Master's thesis, University of Cape Town, 2010. http://hdl.handle.net/11427/12230.

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Includes bibliographical references (leaves 50-57).<br>The South African abalone Haliotis midae is a commercially exploited species that is seriously threatened by overfishing and poaching. This not only affects the species itself but also the integrity and functionng of the ecosystem through associated changes in community structure. I assessed the influence of abalone on the ecosystem by a combination of (a) dietary studies, (b) comparisons of communities living on shell versus surrounding rock substratum, and (c) removal experiments using field exclusion/inclusion plots.
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Erasmus, Jean Helen. "The role of enteric bacteria in the Abalone, Haliotis Midae." Master's thesis, University of Cape Town, 1996. http://hdl.handle.net/11427/18062.

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Summary in English.<br>The role of bacteria in the digestive tract of the abalone Haliotis midae was examined to determine whether bacteria aid hydrolysis of polysaccharides present in seaweeds which farmed abalone consume. The enteric bacteria were enumerated using culturable and total (DAPI) counts. The numbers of culturable bacteria fell between 3.5x10⁵ and 2.3x10⁸ cfu/g wet weight tissue. The DAPI counts were between 1.6x10⁹ and 5.1x10⁹ cells per gram of tissue. The numbers of bacteria differed between the crop, stomach and intestine. Electron microscopy showed that bacteria were present o
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28

Barkai, Revital. "An energy budget for the South African abalone Haliotis Midae." Master's thesis, University of Cape Town, 1987. http://hdl.handle.net/11427/21995.

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Bibliography: pages 65-75.<br>This study aims to quantify both the individual and population energy budgets of the large edible gastropod Haliotis midae, and is divided into three major sections. Section 1 deals with diet and section 2 the consumption rate, absorption efficiency, respiration rate and rate of ammonia excretion, each of which were measured as functions of wet body mass. Each aspect was studied using animals from two sites subject to different temperature regimes. One of these was on the western Cape coast, off Marcus Island (at 14° C) and the other on the south western Cape, Cap
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Shipton, Thomas A. "The protein requirements of the South African abalone, Haliotis midae." Thesis, Rhodes University, 2000. http://hdl.handle.net/10962/d1005159.

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The potential to reduce feed formulation costs by the replacement of existing proteinsources in artificial feeds for Haliotis midae was assessed. A comparison between the efficacy of the direct method and chromic oxide marker techniques in determining apparent protein digestibility coefficients, revealed that while the former was not a suitable methodology for use with this species, the latter produced replicable and reliable results. It was established that the chromic oxide marker is inert, is not absorbed by the abalone, does not interfere with the digestive processes and moves through the
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Vlok, Arnoldus Christiaan. "Genetic assessment of five breeding populations of abalone (Haliotis midae) through a comparative Performance Testing Scheme." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/96870.

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Thesis (MSc)--Stellenbosch University, 2015.<br>ENGLISH ABSTRACT: Cultured abalone in South Africa is undomesticated. For the local industry to remain competitive on the international markets it is essential to improve production. This study is part of a selective breeding component of a larger genetic programme that aims to enhance productivity of the local industry by genetic improvement of growth rates. Selective breeding programmes are based on genetic variation and correlations. Molecular studies proved genetic differentiation exist between the broodstock- and offspring populations and a
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Franzmann, Bernard Anthony. "Resistance to sorghum midge and management of panicle pests in sorghum /." [St. Lucia, Qld.], 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18293.pdf.

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Hooper, Helen Louise. "Pesticide effects on resource-limited populations of the midge Chironomus riparius." Thesis, University of Reading, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271583.

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Du, Chen. "Global analysis of microrna species in the gall midge Mayetiola destructor." Thesis, Kansas State University, 2015. http://hdl.handle.net/2097/20375.

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Master of Science<br>Entomology<br>Ming-Shun Chen<br>Robert "Jeff" J. Whitworth<br>MicroRNA (miRNA) plays a role in nearly all the biological pathways and therefore may provide opportunities to develop new means to combat the Hessian fly, Mayetiola destructor, a destructive pest of wheat. This study presents a comprehensive analysis of miRNA species via deep-sequencing samples from Hessian fly second instar larvae, pupae and adults. A total of 921 unique miRNA species were identified from approximately 30 million sequence reads. Among the 921 miRNA species, only 22 were conserved among Hessian
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North, Jarid. "Identification of a potential antimicrobial peptide derived from Haliotis midae haemocyanin." Master's thesis, Faculty of Science, 2019. http://hdl.handle.net/11427/31083.

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Haliotis midae aquaculture within South Africa remains afflicted by infectious diseases. Understanding of how the abalone’s innate immune response functions is one of the greatest hindrances to assisting with the defence or detection of pathogenic attacks on farms. The multifunctional oxygen transporter haemocyanin was previously found to be upregulated in response to bacterial infection (Beltran 2015), indicating it may play a role in the defence response of Haliotis midae. The current knowledge regarding haemocyanin’s role in the abalone innate immune response is incomplete. A number of stud
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Riddin, Nicholas Alwyn. "Growth and gonad size in cultured South African abalone, Haliotis midae." Thesis, Rhodes University, 2013. http://hdl.handle.net/10962/d1001651.

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According to farm records, cultured Haliotis midae (50-70 g.abalone⁻¹) were growing 10% slower in winter when compared to summer. This reduction in growth rate also coincided with enlarged gonads. Initial trials showed that there were differences in mean monthly growth rates ranging from 1.97 – 5.14 g abalone⁻¹ month⁻¹, and gonad bulk index (GBI) also varied between months (GBI range: 26.88 ± 12.87 to 51.03 ± 34.47). The investment of energy into gonad tissue growth did not compromise whole body growth as the abalone continued to gain weight throughout the reproductive periods, probably due to
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Roubos, Craig Richard. "Monitoring and managing blueberry gall midge (Diptera: Cecidomyiidae) in rabbiteye blueberries." [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0024872.

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Williams, Ryan Williams. "Application of Spatial Analysis in the Incidence of the Gall Midge in Jamaican Hot Pepper Production." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/34155.

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Jamaican farmers are experiencing constraints to hot pepper (Capsicum chinense) export production due to a quarantine pest -- the gall midge (Contarinia lycopersici; Prodiplosis longifila). There is a threat of gall midge introduction into the United States, where the insect pest is not known to occur. This research tests the significance of a range of variables to gall midge incidence. The purpose was to explain the spatial patterns that result from the relationships between gall midge incidence in hot pepper production and production methods and/or environmental conditions. There were th
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Huddy, Robert John. "Molecular characterisation of the vibrio midae sy9 extra cellular alkaline serine protease and its role in the previously observed probiotic effect on the growth of Haliotis midae." Doctoral thesis, University of Cape Town, 2010. http://hdl.handle.net/11427/4273.

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Abalone are marine gastropods that command a very high market price, particularly in the Far East where they are a highly sought after sea food delicacy. South Africa has a rapidly developing abalone aquaculture industry, based on the cultivation of Haliotis midae in landbased race-way systems. The relatively slow growth rates of abalone represent a major constraint on the abalone aquaculture industry. However, there is mounting experimental evidence showing that the health and physiology of aquacultured species can be improved through the prophylactic use of probiotic bacteria. Previous resea
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Özer, Aylin Coşkun Döner Fehmi. "Deneysel mide içeriği sıvısının tavşan burun ve paranazal sinüslerine etkisi /." Isparta : SDÜ Tıp Fakültesi, 2004. http://tez.sdu.edu.tr/Tezler/TT00136.pdf.

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Murchie, Archie Kelso. "Parasitoids of cabbage seed weevil and brassica pod midge in oilseed rape." Thesis, Keele University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318159.

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Oilseed rape (Brassica napus (L. )), the second most important arable crop in the UK after cereals, is attacked during the summer by cabbage seed weevil Ceutorhynchus assimilis (Paykull) and brassica pod midge Dasineura =brassicae (Winnertz). In mainland Europe, these two 'pests are known to be attacked by a range of hymenopteran parasitoids but virtually nothing is known about their parasitoids in the UK. This study found that the ectoparasitic Trichomalus perfectus (Walker) (Pteromalidae) was the most abundant species attacking C. assimilis, achieving, in unsprayed crops, levels of parasitis
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Sandenbergh, Lise. "Optimization of gene transfer in Haliotis midae by means of polyplex mediation." Thesis, Stellenbosch : Stellenbosch University, 2010. http://hdl.handle.net/10019.1/5478.

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Thesis (MSc (Genetics))--Stellenbosch University, 2010.<br>ENGLISH ABSTRACT: Haliotis midae is the most important aquaculture species in South Africa, with abalone farming contributing 80% of the Rand value of the aquaculture industry. Although genetic research has benefited the abalone industry, several issues still hinder increases in abalone production. Progress towards an increase in H. midae growth rate by utilizing conventional genetic studies and selective breeding has been relatively slow. Gene transfer has therefore become a plausible option to address this problem. Genes that co
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Carpenter, Simon. "Colonisation and dispersal studies of the Scottish biting midge, Culicoides impunctatus Goetghebuer." Thesis, University of Aberdeen, 2001. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=237733.

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This study investigates aspects of the biology of C. impunctatus with a view to producing an optimised laboratory culture of this species. Artificial membrane feeding of C. impunctatus is shown to be enhanced by the addition of blood vestiges to the outer surface of the feeding apparatus. The effects of holding temperature, environment and conspecific density upon oogenesis in blood fed female midges are assessed through mortality, digestion of the blood meal and development of the eggbatch over time. Oviposition in C. impunctatus is investigated through choice and nochoice bioassays which sho
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Green, Alistair John. "The protein and energy requirements of the South African abalone, Haliotis midae." Thesis, Rhodes University, 2009. http://hdl.handle.net/10962/d1008261.

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The abalone (Haliotis midae) culture industry in South Africa is becoming increasingly dependent on the use of formulated feeds, due to limitations in the supply of kelp. The bulk of the feeds that are currently available were developed based on the requirements of juvenile abalone cultured within the optimal temperature range for growth (18 - 20 °C). However, most abalone farming facilities are land-based pump ashore operations and are thus mostly exposed to temperatures outside of this range. In addition, these feeds have been found to be unsuitable for abalone cultured at elevated water tem
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Harrup, Lara Ellen. "The influence of fram-level factors on midge abundance and transmission of arboviruses." Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.531821.

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Tsanigab, Salomon M. "Evaluating Namibian macrophytic algae as dietary source for South African abalone (Haliotis midae)." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/1657.

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Thesis (Msc Food Sc (Food Science))--University of Stellenbosch, 2009.<br>An 84-day study was conducted to find a suitable diet and feeding level for the culture of South African abalone (Haliotis midae) in Namibia. Two experimental diets, namely, a seaweed diet (SWD) Laminaria pallida (macrophytic algae) and a formulated diet (FD) (macro-algae), for use in abalone (Haliotis midae) feed development, were evaluated. The animals used in this study were juveniles (24.33 ± 3.14 mm shell length; 2.72 ± 0.83 g live weight, mean ± SE) and sub-adults (58.07 ± 10.33 mm shell length and 41.96 ± 20.61 g
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Mohamed, Riaaz. "Abalone nutrition – growth performance of Haliotis midae in relation to variable artificial feeds." University of Western Cape, 2020. http://hdl.handle.net/11394/7860.

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Magister Scientiae (Biodiversity and Conservation Biology) - MSc (Biodiv and Cons Biol)<br>Abalone are among the most expensive and sought-after seafood subjects. In South Africa, Haliotis midae is the only commercially significant abalone species and it has become increasingly sold on the global market. The importance of abalone as a mariculture subject has triggered extensive research into maximizing production, with particular emphasis on optimizing growth rates. This study aimed to assess the growth performance of Haliotis midae relative to 1) standard pelleted feed, and 2) kelp-inclusive
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Lloyd, Kyle Everett. "Towards determining the dietary lysine requirement in the South African abalone, Haliotis midae." Thesis, Rhodes University, 2016. http://hdl.handle.net/10962/1024.

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Animals generally do not have a requirement for protein, but instead have a requirement for specific essential amino acids (EAAs) and non-essential amino acids (NEAAs). The NEAAs are those that can be synthesised by the animal, however, EAAs cannot be synthesised and must therefore be supplied as part of the diet. When these amino acids (AAs) are supplied in the correct ratios and with the correct level of digestible energy, nutritionists can maximise somatic growth from proteins. This has resulted in increased research into the use of crystalline AAs as a tool in feed formulation research in
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Aksakal, Gökhan İşler Mehmet. "Sulfasalazin ve bileşenlerinin, amonyak ile oluşturulan mide mukoza lezyonlarına koruyucu etkisi /." Isparta : SDÜ Tıp Fakültesi, 2003. http://tez.sdu.edu.tr/Tezler/TT00114.pdf.

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Ruivo, Nicola Ribeiro. "Microsatellite genotyping of contributing broodstock and selected offspring of Haliotis midae submitted to a growth performance recording scheme." Thesis, Stellenbosch : Stellenbosch University, 2007. http://hdl.handle.net/10019.1/21755.

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Thesis (MSc)--University of Stellenbosch, 2007.<br>ENGLISH ABSTRACT: The indigenous abalone Haliotis midae is one of the most remarkable and highly exploited species of marine molluscs in South Africa. It is the only species of southern African Haliotidae to be commercially reared and has been successfully cultured for almost two decades. Its short history of domestication along with market demands and the need to develop efficiency in the production process has resulted in an increased interest in the possible genetic improvement of this species. The unhurried growth rate associated with
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Nicholson, Gareth Hurst. "Towards understanding the effects of stocking density on farmed South African abalone, Haliotis Midae." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1015646.

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The profitability of abalone farms is heavily influenced by their production per unit of grow-out space. With farms having physically expanded to the maximum, and with increasing production costs, one of the most realistic ways for farms to increase their production is through optimizing stocking densities. The effect of stocking density on Haliotis midae performance is undocumented and optimal stocking densities for this species have not been determined. Experiments were conducted under farm conditions to investigate the effects of four different stocking densities (16 %, 20 %, 22 % and 24 %
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