Articles by Keyword: Copper Steenbras

Search results for Copper Steenbras

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  1. Fifty-five-year longevity for the largest member of the family Sparidae: the endemic red steenbras <em>Petrus rupestris</em> from South Africa

    Fifty-five-year longevity for the largest member of the family Sparidae: the endemic red steenbras <em>Petrus rupestris</em> from South Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    A previous study that explored the age and growth of red steenbras Petrus rupestris (Valenciennes, 1830), a large sparid (family Sparidae, seabreams or porgies) endemic to South Africa and reported to approach 2 m in length, provided estimates as a...
  2. Concentration, accumulation and uptake rate of Cu, Fe, Mn and Zn by wheat under irrigation

    Concentration, accumulation and uptake rate of Cu, Fe, Mn and Zn by wheat under irrigation

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The objective of this study was to obtain information on the Cu, Fe, Mn and Zn uptake patterns of wheat (Triticum aestivum L.) grown under normal irrigation farming conditions. Except for irrigation scheduling, the 13 farmers on whose farms the...
  3. Observations on the linefish resources of Namibia, 1990?2000, with special reference to West Coast steenbras and silver kob

    Observations on the linefish resources of Namibia, 1990?2000, with special reference to West Coast steenbras and silver kob

    Item type: Journal Article • Journal: South African Journal of Marine Science
    The Namibian linefishery is a multisector fishery, with recreational and commercial sectors targeting overlapping species. Prior to 1990, catch data were recorded for the boat sector, but little research was done on the population dynamics of any of the species...
  4. Age and growth of two populations of West Coast steenbras Lithognathus aureti in Namibian waters, based on otolith readings and mark-recapture data

    Age and growth of two populations of West Coast steenbras Lithognathus aureti in Namibian waters, based on otolith readings and mark-recapture data

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Age and growth of West Coast steenbras Lithognathus aureti, sampled from two separate populations (northern and southern) along Namibia's coast, was determined using sectioned otoliths, and the results were validated using mark-recapture data. For both populations, the special three-parameter Von...
  5. An assessment of the current status and potential yield of Namibia's northern West Coast steenbras <em>Lithognathus aureti</em> population

    An assessment of the current status and potential yield of Namibia's northern West Coast steenbras <em>Lithognathus aureti</em> population

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Two distinct populations of West Coast steenbras Lithognathus aureti are found in Namibian waters; one, the northern population, is exploited recreationally and commercially. Data collected between 1995 and 1999 were used to evaluate its current state and potential yield, using...
  6. A PRELIMINARY BIOCHEMICAL GENETIC STIJDY OF TWO POPULATIONS OF <em>LITHOGNATHUS AURETI</em> (PERCIFORMES: SPARIDAE)

    A PRELIMINARY BIOCHEMICAL GENETIC STIJDY OF TWO POPULATIONS OF <em>LITHOGNATHUS AURETI</em> (PERCIFORMES: SPARIDAE)

    Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences
    Two populations of Lithognathus aureti were electrophoretically analysed to determine the extent of genetic divergence between, and variation within them. Gene products of 35 protein coding loci showed no fixed allele differences between these populations. However, significant genotypic differentiation between...
  7. A note on copper bioaccumulation in Mozambique tilapia, <em>Oreochromis mossambicus</em> (Osteichthyes: Cichlidae)

    A note on copper bioaccumulation in Mozambique tilapia, <em>Oreochromis mossambicus</em> (Osteichthyes: Cichlidae)

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Copper (Cu) is one of the most commonly reported metal pollutants in African water bodies, but there are few studies on African freshwater fish species of copper accumulation and copper toxicity. Adult O. mossambicus were exposed to 0mg l−1 (control)...
  8. Acute effects of Cu on oxygen consumption and 96 hr-LC<sub>50</sub> values in the freshwater fish <em>Tilapia sparrmani</em> (Teleostei: Cichlidae) in Mooi River hard water, South Africa

    Acute effects of Cu on oxygen consumption and 96 hr-LC<sub>50</sub> values in the freshwater fish <em>Tilapia sparrmani</em> (Teleostei: Cichlidae) in Mooi River hard water, South Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The median lethal copper (Cu) concentration (96 hr-LC50) values for acute Cu toxicity for Tilapia sparrmanii (live mass: 30 ± 8g) in Mooi River hard water of dolomitic origin at 20 °C, pH 7.9, was 68.1 μmol l−1. At this...
  9. The sublethal effects of copper and lead on the haematology and acid-base balance of the groovy mullet, <em>Liza dumerili</em>

    The sublethal effects of copper and lead on the haematology and acid-base balance of the groovy mullet, <em>Liza dumerili</em>

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Toxicity bioassays were conducted on groovy mullet, Liza dumerili, using copper and lead, in order to assess how these metals affected their blood haematology and acid-base balance. Short-term (96 hours) exposure to lead caused significantly more haematological response [PCO2] than...
  10. The effect of copper and zinc at neutral and acidic pH on the blood coagulation of <em>Oreochromis mossambicus</em>

    The effect of copper and zinc at neutral and acidic pH on the blood coagulation of <em>Oreochromis mossambicus</em>

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The effect of copper and zinc on fish blood coagulation under alkaline and acidic conditions and the possible occurrence of disseminated intravascular clotting under these conditions have been poorly studied to date.