Water quality requirements for first-feeding in marine fish larvae of the Cape of Good Hope, with description of developmental stages

dc.contributor.advisorBrown, Alec Cen_ZA
dc.contributor.advisorField, John Gen_ZA
dc.contributor.advisorChampion, Harolden_ZA
dc.contributor.authorBrownell, Charles Len_ZA
dc.date.accessioned2016-04-12T09:37:20Z
dc.date.available2016-04-12T09:37:20Z
dc.date.issued1979en_ZA
dc.descriptionBibliography: pages 259-272.en_ZA
dc.description.abstractThe tolerance of marine fish larvae to NH₃, NO₂⁻, NO₃⁻, H⁺, OH⁻, O₂, and CO₂ was investigated using the decrease in first-feeding incidence following a 24-h exposure as the criterion of response. Ten species, all hatched from pelagic eggs collected at sea, were used in the studies: two soleids (Heteromycteris, Synaptura), a cynoglossid (Trulla), a gadid (Gaidropsarus), a congiopodid (Congiopodus), four sparids (Diplodus, Lithognathus, Pachymetopon, and an unidentified species), and a centracanthid (Pterosmaris). Concentrations that inhibited first-feeding are compared to 24-h LC 50's for the same species, and to concentrations that are known to induce lethal and sublethal responses in other teleost species. Judging from their effect on first-feeding, un-ionized ammonia, elevated pH, and reduced oxygen concentration are considered to be potential hazards in the rearing tank. NO₂⁻, NO₃⁻, H⁺, and free CO₂ are nontoxic at levels likely to be encountered in practical fish culture. There are only minor inter-specific differences in calculated 24-h first-feeding EC 50's (concentration that reduces first-feeding incidence by 50%), which suggests general applicability of the results to a wide variety of first-feeding marine fish larvae. Data are presented on the age at first-feeding and point-of-no-return. The suitability of assorted micro-particles (including the rotifer, Proales, and Pine pollen) as experimental foods is discussed.en_ZA
dc.identifier.apacitationBrownell, C. L. (1979). <i>Water quality requirements for first-feeding in marine fish larvae of the Cape of Good Hope, with description of developmental stages</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Biological Sciences. Retrieved from http://hdl.handle.net/11427/18802en_ZA
dc.identifier.chicagocitationBrownell, Charles L. <i>"Water quality requirements for first-feeding in marine fish larvae of the Cape of Good Hope, with description of developmental stages."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 1979. http://hdl.handle.net/11427/18802en_ZA
dc.identifier.citationBrownell, C. 1979. Water quality requirements for first-feeding in marine fish larvae of the Cape of Good Hope, with description of developmental stages. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Brownell, Charles L AB - The tolerance of marine fish larvae to NH₃, NO₂⁻, NO₃⁻, H⁺, OH⁻, O₂, and CO₂ was investigated using the decrease in first-feeding incidence following a 24-h exposure as the criterion of response. Ten species, all hatched from pelagic eggs collected at sea, were used in the studies: two soleids (Heteromycteris, Synaptura), a cynoglossid (Trulla), a gadid (Gaidropsarus), a congiopodid (Congiopodus), four sparids (Diplodus, Lithognathus, Pachymetopon, and an unidentified species), and a centracanthid (Pterosmaris). Concentrations that inhibited first-feeding are compared to 24-h LC 50's for the same species, and to concentrations that are known to induce lethal and sublethal responses in other teleost species. Judging from their effect on first-feeding, un-ionized ammonia, elevated pH, and reduced oxygen concentration are considered to be potential hazards in the rearing tank. NO₂⁻, NO₃⁻, H⁺, and free CO₂ are nontoxic at levels likely to be encountered in practical fish culture. There are only minor inter-specific differences in calculated 24-h first-feeding EC 50's (concentration that reduces first-feeding incidence by 50%), which suggests general applicability of the results to a wide variety of first-feeding marine fish larvae. Data are presented on the age at first-feeding and point-of-no-return. The suitability of assorted micro-particles (including the rotifer, Proales, and Pine pollen) as experimental foods is discussed. DA - 1979 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1979 T1 - Water quality requirements for first-feeding in marine fish larvae of the Cape of Good Hope, with description of developmental stages TI - Water quality requirements for first-feeding in marine fish larvae of the Cape of Good Hope, with description of developmental stages UR - http://hdl.handle.net/11427/18802 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/18802
dc.identifier.vancouvercitationBrownell CL. Water quality requirements for first-feeding in marine fish larvae of the Cape of Good Hope, with description of developmental stages. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 1979 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/18802en_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.titleWater quality requirements for first-feeding in marine fish larvae of the Cape of Good Hope, with description of developmental stagesen_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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