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Water quality requirements for first-feeding in marine fish larvae of the Cape of Good Hope, with description of developmental stages
Bibliography: pages 259-272.
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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Department of Biological Sciences
2016
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| _version_ | 1867613247988826113 |
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| access_status_str | Open Access |
| author | Brownell, Charles L |
| author2 | Brown, Alec C |
| author_browse | Brown, Alec C Brownell, Charles L |
| author_facet | Brown, Alec C Brownell, Charles L |
| author_sort | Brownell, Charles L |
| collection | Thesis |
| description | Bibliography: pages 259-272. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/18802 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:33:07.122Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Department of Biological Sciences |
| publisherStr | Department of Biological Sciences |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/18802 Water quality requirements for first-feeding in marine fish larvae of the Cape of Good Hope, with description of developmental stages Brownell, Charles L Brown, Alec C Field, John G Champion, Harold Zoology Bibliography: pages 259-272. 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. 2016-04-12T09:37:20Z 2016-04-12T09:37:20Z 1979 Doctoral Thesis Doctoral PhD http://hdl.handle.net/11427/18802 eng application/pdf Department of Biological Sciences Faculty of Science University of Cape Town |
| spellingShingle | Zoology Brownell, Charles L Water quality requirements for first-feeding in marine fish larvae of the Cape of Good Hope, with description of developmental stages |
| thesis_degree_str | Doctoral |
| title | Water quality requirements for first-feeding in marine fish larvae of the Cape of Good Hope, with description of developmental stages |
| title_full | Water quality requirements for first-feeding in marine fish larvae of the Cape of Good Hope, with description of developmental stages |
| title_fullStr | Water quality requirements for first-feeding in marine fish larvae of the Cape of Good Hope, with description of developmental stages |
| title_full_unstemmed | Water quality requirements for first-feeding in marine fish larvae of the Cape of Good Hope, with description of developmental stages |
| title_short | Water quality requirements for first-feeding in marine fish larvae of the Cape of Good Hope, with description of developmental stages |
| title_sort | water quality requirements for first feeding in marine fish larvae of the cape of good hope with description of developmental stages |
| topic | Zoology |
| url | http://hdl.handle.net/11427/18802 |
| work_keys_str_mv | AT brownellcharlesl waterqualityrequirementsforfirstfeedinginmarinefishlarvaeofthecapeofgoodhopewithdescriptionofdevelopmentalstages |