Articles by Author: J H J Van Vuren

Search results for J H J Van Vuren

We found 20 results for you
  1. THE PLASMA PROTEINS OF SOME FRESHWATER FISH IN THEIR NATURAL ENVIRONMENT

    THE PLASMA PROTEINS OF SOME FRESHWATER FISH IN THEIR NATURAL ENVIRONMENT

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    The plasma proteins of Cyprinus carpio (carp), Barbus holubi (yellowfish), Labeo umbratus (mudfish) and Labeo capensis (mudfish) were electrophoretically separated on polyacrylamide gels from blood samples obtained from specimens sampled during summer and winter in three different localities. Within a...
  2. 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.
  3. The effect of copper and zinc at neutral and acidic pH on the general haematology and osmoregulation of <em>Oreochromis mossambicus</em>

    The effect of copper and zinc at neutral and acidic pH on the general haematology and osmoregulation of <em>Oreochromis mossambicus</em>

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The objective of this study was to determine the effect of sublethal copper and zinc concentrations at a neutral and an acidic pH, on selected haematological parameters as well as on the total osmolality and electrolyte concentrations of Oreochromis mossambicus...
  4. Bacterial levels in the Nyl River system, Limpopo province, South Africa

    Bacterial levels in the Nyl River system, Limpopo province, South Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Because water quantity and quality are of great importance in the arid Limpopo province, the bacterial content of water in the Nyl River System and its possible origins were assessed at five sites. Quarterly surveys took place between April 2001...
  5. Anthropogenic spatial and temporal changes in the aquatic macro invertebrate assemblages of the lower Mvoti River, KwaZulu-Natal, South Africa

    Anthropogenic spatial and temporal changes in the aquatic macro invertebrate assemblages of the lower Mvoti River, KwaZulu-Natal, South Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Industrial and urban impacts on the lower reaches of the Mvoti River were studied using changes in macroinvertebrate community structures as indicators of environmental change. Macroinvertebrates were sampled during high- and low-flows in 2005 in the lower Mvoti River and...
  6. Accumulation of hepatic Hsp70 and plasma cortisol in <em>Oreochromis mossambicus</em> following sublethal metal and DDT exposure

    Accumulation of hepatic Hsp70 and plasma cortisol in <em>Oreochromis mossambicus</em> following sublethal metal and DDT exposure

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Heat shock response in Oreochromis mossambicus livers was measured, using antibodies specific to Hsp70 family members, by an immunoblotting protocol. The hepatic isoforms Hsp70, Hsp74 and Hsp76 were identified and quantified from copper exposures. Long-term DDT exposure did not result...
  7. Exfoliative liver cytology in <em>Oreochromis mossambicus</em> as a bio-assessment tool for aquatic pollution

    Exfoliative liver cytology in <em>Oreochromis mossambicus</em> as a bio-assessment tool for aquatic pollution

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The use of exfoliative cytology as a bio-assessment tool was evaluated to (1) identify and describe different cell types of normal liver cytology of Oreochromis mossambicus, (2) identify and describe changes in the cell types after exposure to cadmium and...
  8. Heavy metal concentrations in the water of the Nyl River system, South Africa

    Heavy metal concentrations in the water of the Nyl River system, South Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The Nyl River floodplain, a Ramsar site that provides habitat for a number of endangered species, is one of the jewels in the arid Limpopo province and thus its conservation and protection are vitally important. Very little work has been...
  9. Health of sharptooth catfish <em>Clarias gariepinus</em> in Pongolapoort Dam, South Africa: a comprehensive study

    Health of sharptooth catfish <em>Clarias gariepinus</em> in Pongolapoort Dam, South Africa: a comprehensive study

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    A histology-based fish health assessment protocol was used in 2009–2010 to assess the health status of Clarias gariepinus from Pongolapoort Dam, South Africa. Nineteen fish were collected by angling. The histology of liver, kidney, gills and testes or ovaries was...
  10. Yellowfish and Tigerfish Haematology

    Item type: Journal Article • Journal: Zoologica Africana