Studies related to the artificial spawning and culture of the Abalone, Haliotis midae linne, 1785

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dc.contributor.advisorBrown, Alec Cen_ZA
dc.contributor.advisorBranch, George Men_ZA
dc.contributor.authorHenry, Neil Richarden_ZA
dc.date.accessioned2015-10-25T17:11:02Z
dc.date.available2015-10-25T17:11:02Z
dc.date.issued1996en_ZA
dc.descriptionBibliography: leaves 122-135.en_ZA
dc.description.abstractThe successful aquaculture of the abalone Haliotis midae requires a multi-disciplinary approach. Experiments were designed to provide insight into various aspects of abalone biology and seawater system design. A comparative evaluation of a closed and open seawater system for an H. midae hatchery was performed. Monthly seawater temperatures and nitrite levels were higher in the closed system. The salinity of the closed system seawater varied more than that of the open system. The pH of seawater in the closed system varied between 7.7 and 8.2. This was lower than the 7.9 to 8.35 pH range of the open system seawater. An open system is thus clearly preferable to a closed system. Haliotis midae reproductive condition can be assessed visually by examining the shape and colour of the broodstock gonads. Spawning experiments showed that abalone should be starved for at least 24 hours prior to spawning induction. Haliotis midae can be induced to spawn by treatment with hydrogen peroxide when exposed to seawater at a pH of between 9.0 and 9.9 (males and females) Spawning can reliably be induced by using final hydrogen peroxide concentrations in the range of 7 to 25 mM for male and female H. midae. Gravid broodstock should be exposed to hydrogen peroxide for 100 to 300 minutes during spawning induction. There was no significant impact observed for prior conditioning of the brood-stock to the spawning tanks, lunar phase and timing of spawning induction relative to sunset. Haliotis midae larval toxicity to chlorine, copper and ammonia was investigated. The LT50 to a chlorine concentration of 0.06 mg/l was 170 minutes. For copper the LT50 of larvae exposed to 0.12 mg/l was 53 minutes. The LT50 of ammonia at 5 mg/l was 600 minutes. A brief synopsis of the major findings is presented in the last chapter. Some discussion on the future prospects of the abalone industry is also provided.en_ZA
dc.identifier.apacitationHenry, N. R. (1996). <i>Studies related to the artificial spawning and culture of the Abalone, Haliotis midae linne, 1785</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Biological Sciences. Retrieved from http://hdl.handle.net/11427/14354en_ZA
dc.identifier.chicagocitationHenry, Neil Richard. <i>"Studies related to the artificial spawning and culture of the Abalone, Haliotis midae linne, 1785."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 1996. http://hdl.handle.net/11427/14354en_ZA
dc.identifier.citationHenry, N. 1996. Studies related to the artificial spawning and culture of the Abalone, Haliotis midae linne, 1785. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Henry, Neil Richard AB - The successful aquaculture of the abalone Haliotis midae requires a multi-disciplinary approach. Experiments were designed to provide insight into various aspects of abalone biology and seawater system design. A comparative evaluation of a closed and open seawater system for an H. midae hatchery was performed. Monthly seawater temperatures and nitrite levels were higher in the closed system. The salinity of the closed system seawater varied more than that of the open system. The pH of seawater in the closed system varied between 7.7 and 8.2. This was lower than the 7.9 to 8.35 pH range of the open system seawater. An open system is thus clearly preferable to a closed system. Haliotis midae reproductive condition can be assessed visually by examining the shape and colour of the broodstock gonads. Spawning experiments showed that abalone should be starved for at least 24 hours prior to spawning induction. Haliotis midae can be induced to spawn by treatment with hydrogen peroxide when exposed to seawater at a pH of between 9.0 and 9.9 (males and females) Spawning can reliably be induced by using final hydrogen peroxide concentrations in the range of 7 to 25 mM for male and female H. midae. Gravid broodstock should be exposed to hydrogen peroxide for 100 to 300 minutes during spawning induction. There was no significant impact observed for prior conditioning of the brood-stock to the spawning tanks, lunar phase and timing of spawning induction relative to sunset. Haliotis midae larval toxicity to chlorine, copper and ammonia was investigated. The LT50 to a chlorine concentration of 0.06 mg/l was 170 minutes. For copper the LT50 of larvae exposed to 0.12 mg/l was 53 minutes. The LT50 of ammonia at 5 mg/l was 600 minutes. A brief synopsis of the major findings is presented in the last chapter. Some discussion on the future prospects of the abalone industry is also provided. DA - 1996 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1996 T1 - Studies related to the artificial spawning and culture of the Abalone, Haliotis midae linne, 1785 TI - Studies related to the artificial spawning and culture of the Abalone, Haliotis midae linne, 1785 UR - http://hdl.handle.net/11427/14354 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/14354
dc.identifier.vancouvercitationHenry NR. Studies related to the artificial spawning and culture of the Abalone, Haliotis midae linne, 1785. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 1996 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/14354en_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.titleStudies related to the artificial spawning and culture of the Abalone, Haliotis midae linne, 1785en_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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