Acute and chronic effects of ammonia in the South African abalone, Haliotis midae Linnaeus (Mollusca)

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dc.contributor.advisorMoloney, Coleenen_ZA
dc.contributor.advisorCook, Peteren_ZA
dc.contributor.advisorLopata, Andreasen_ZA
dc.contributor.authorReddy-Lopata, Kasturien_ZA
dc.date.accessioned2014-08-13T14:07:20Z
dc.date.available2014-08-13T14:07:20Z
dc.date.issued2006en_ZA
dc.descriptionIncludes bibliographical references (p. 104-116).en_ZA
dc.description.abstractAmmonia is the major end-product of protein catabolism in abalone, and is excreted into the surrounding water. Build-up of ammonia in abalone aquaculture systems can reach high toxic levels and impact negatively on farming operations. Ammonia levels therefore have to be regulated. Accurate estimates of toxic un-ionized ammonia (FAN) from the total ammonia nitrogen (TAN) measured by photometer test kits is crucial as inaccuracies could result in major losses of abalone on the farms. The accuracy and applicability of two frequently used photometer test kits (the Nesslers method and the Palintest method) were compared. The calculated TAN concentrations were regressed against the prepared standard ammonia concentrations in seawater for both methods. The predicted slope (β = 1) if the methods were 100% accurate was compared to observed slopes using the Nesslers (β=0.8327) and Palintest (β = 0.7507) methods. Both these test kits underestimated the TAN concentrations, but the Nesslers method was more accurate. Nitrites and nitrates are toxic to abalone at much larger concentrations than ammonia and exist at low concentrations in natural systems, therefore the sensitivity of their tests was not as important. Nitrites and nitrates were monitored using the Ferrous sulphate method and the Cadmium reduction method, respectively.en_ZA
dc.identifier.apacitationReddy-Lopata, K. (2006). <i>Acute and chronic effects of ammonia in the South African abalone, Haliotis midae Linnaeus (Mollusca)</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Biological Sciences. Retrieved from http://hdl.handle.net/11427/6169en_ZA
dc.identifier.chicagocitationReddy-Lopata, Kasturi. <i>"Acute and chronic effects of ammonia in the South African abalone, Haliotis midae Linnaeus (Mollusca)."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 2006. http://hdl.handle.net/11427/6169en_ZA
dc.identifier.citationReddy-Lopata, K. 2006. Acute and chronic effects of ammonia in the South African abalone, Haliotis midae Linnaeus (Mollusca). University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Reddy-Lopata, Kasturi AB - Ammonia is the major end-product of protein catabolism in abalone, and is excreted into the surrounding water. Build-up of ammonia in abalone aquaculture systems can reach high toxic levels and impact negatively on farming operations. Ammonia levels therefore have to be regulated. Accurate estimates of toxic un-ionized ammonia (FAN) from the total ammonia nitrogen (TAN) measured by photometer test kits is crucial as inaccuracies could result in major losses of abalone on the farms. The accuracy and applicability of two frequently used photometer test kits (the Nesslers method and the Palintest method) were compared. The calculated TAN concentrations were regressed against the prepared standard ammonia concentrations in seawater for both methods. The predicted slope (β = 1) if the methods were 100% accurate was compared to observed slopes using the Nesslers (β=0.8327) and Palintest (β = 0.7507) methods. Both these test kits underestimated the TAN concentrations, but the Nesslers method was more accurate. Nitrites and nitrates are toxic to abalone at much larger concentrations than ammonia and exist at low concentrations in natural systems, therefore the sensitivity of their tests was not as important. Nitrites and nitrates were monitored using the Ferrous sulphate method and the Cadmium reduction method, respectively. DA - 2006 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2006 T1 - Acute and chronic effects of ammonia in the South African abalone, Haliotis midae Linnaeus (Mollusca) TI - Acute and chronic effects of ammonia in the South African abalone, Haliotis midae Linnaeus (Mollusca) UR - http://hdl.handle.net/11427/6169 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/6169
dc.identifier.vancouvercitationReddy-Lopata K. Acute and chronic effects of ammonia in the South African abalone, Haliotis midae Linnaeus (Mollusca). [Thesis]. University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 2006 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/6169en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Biological Sciencesen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherZoologyen_ZA
dc.titleAcute and chronic effects of ammonia in the South African abalone, Haliotis midae Linnaeus (Mollusca)en_ZA
dc.typeDoctoral Thesis
dc.type.qualificationlevelDoctoral
dc.type.qualificationnamePhDen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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